Release 4.7 scripts/mod/modpost.c

/* Postprocess module symbol versions
 *
 * Copyright 2003       Kai Germaschewski
 * Copyright 2002-2004  Rusty Russell, IBM Corporation
 * Copyright 2006-2008  Sam Ravnborg
 * Based in part on module-init-tools/depmod.c,file2alias
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 * Usage: modpost vmlinux module1.o module2.o ...
 */


#define _GNU_SOURCE
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <limits.h>
#include <stdbool.h>
#include <errno.h>
#include "modpost.h"
#include "../../include/generated/autoconf.h"
#include "../../include/linux/license.h"
#include "../../include/linux/export.h"

/* Are we using CONFIG_MODVERSIONS? */

static int modversions = 0;
/* Warn about undefined symbols? (do so if we have vmlinux) */

static int have_vmlinux = 0;
/* Is CONFIG_MODULE_SRCVERSION_ALL set? */

static int all_versions = 0;
/* If we are modposting external module set to 1 */

static int external_module = 0;
/* Warn about section mismatch in vmlinux if set to 1 */

static int vmlinux_section_warnings = 1;
/* Only warn about unresolved symbols */

static int warn_unresolved = 0;
/* How a symbol is exported */

static int sec_mismatch_count = 0;

static int sec_mismatch_verbose = 1;

static int sec_mismatch_fatal = 0;
/* ignore missing files */

static int ignore_missing_files;


enum export {
	


export_plain,      export_unused,     export_gpl,
	


export_unused_gpl, export_gpl_future, export_unknown
};


#define PRINTF __attribute__ ((format (printf, 1, 2)))



PRINTF void fatal(const char *fmt, ...)
{
	va_list arglist;

	fprintf(stderr, "FATAL: ");

	va_start(arglist, fmt);
	vfprintf(stderr, fmt, arglist);
	va_end(arglist);

	exit(1);
}

Contributors
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CommitProp
kai germaschewski
kai germaschewski
47
95.92%
1
33.33%
sam ravnborg
sam ravnborg
1
2.04%
1
33.33%
andi kleen
andi kleen
1
2.04%
1
33.33%
Total
49
100.00%
3
100.00%



PRINTF void warn(const char *fmt, ...)
{
	va_list arglist;

	fprintf(stderr, "WARNING: ");

	va_start(arglist, fmt);
	vfprintf(stderr, fmt, arglist);
	va_end(arglist);
}

Contributors
Person
Tokens
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kai germaschewski
kai germaschewski
42
95.45%
1
33.33%
sam ravnborg
sam ravnborg
1
2.27%
1
33.33%
andi kleen
andi kleen
1
2.27%
1
33.33%
Total
44
100.00%
3
100.00%



PRINTF void merror(const char *fmt, ...)
{
	va_list arglist;

	fprintf(stderr, "ERROR: ");

	va_start(arglist, fmt);
	vfprintf(stderr, fmt, arglist);
	va_end(arglist);
}

Contributors
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matthew wilcox
matthew wilcox
43
97.73%
1
50.00%
andi kleen
andi kleen
1
2.27%
1
50.00%
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44
100.00%
2
100.00%



static inline bool strends(const char *str, const char *postfix)
{
	if (strlen(str) < strlen(postfix))
		return false;

	return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
}

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rusty russell
rusty russell
52
100.00%
1
100.00%
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52
100.00%
1
100.00%



static int is_vmlinux(const char *modname)
{
	const char *myname;

	myname = strrchr(modname, '/');
	if (myname)
		myname++;
	else
		myname = modname;

	return (strcmp(myname, "vmlinux") == 0) ||
	       (strcmp(myname, "vmlinux.o") == 0);
}

Contributors
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sam ravnborg
sam ravnborg
60
100.00%
3
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60
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3
100.00%



void *do_nofail(void *ptr, const char *expr)
{
	if (!ptr)
		fatal("modpost: Memory allocation failure: %s.\n", expr);

	return ptr;
}

Contributors
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kai germaschewski
kai germaschewski
29
96.67%
1
50.00%
andreas gruenbacher
andreas gruenbacher
1
3.33%
1
50.00%
Total
30
100.00%
2
100.00%

/* A list of all modules we processed */

static struct module *modules;



static struct module *find_module(char *modname)
{
	struct module *mod;

	for (mod = modules; mod; mod = mod->next)
		if (strcmp(mod->name, modname) == 0)
			break;
	return mod;
}

Contributors
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CommitProp
andrew morton
andrew morton
44
91.67%
1
33.33%
kai germaschewski
kai germaschewski
3
6.25%
1
33.33%
sam ravnborg
sam ravnborg
1
2.08%
1
33.33%
Total
48
100.00%
3
100.00%



static struct module *new_module(const char *modname)
{
	struct module *mod;
	char *p;

	mod = NOFAIL(malloc(sizeof(*mod)));
	memset(mod, 0, sizeof(*mod));
	p = NOFAIL(strdup(modname));

	/* strip trailing .o */
	if (strends(p, ".o")) {
		p[strlen(p) - 2] = '\0';
		mod->is_dot_o = 1;
	}

	/* add to list */
	mod->name = p;
	mod->gpl_compatible = -1;
	mod->next = modules;
	modules = mod;

	return mod;
}

Contributors
Person
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kai germaschewski
kai germaschewski
60
51.72%
3
27.27%
andrew morton
andrew morton
28
24.14%
4
36.36%
rusty russell
rusty russell
12
10.34%
1
9.09%
frank rowand
frank rowand
8
6.90%
1
9.09%
sam ravnborg
sam ravnborg
8
6.90%
2
18.18%
Total
116
100.00%
11
100.00%

/* A hash of all exported symbols,
 * struct symbol is also used for lists of unresolved symbols */


#define SYMBOL_HASH_SIZE 1024


struct symbol {
	
struct symbol *next;
	
struct module *module;
	
unsigned int crc;
	
int crc_valid;
	
unsigned int weak:1;
	
unsigned int vmlinux:1;    /* 1 if symbol is defined in vmlinux */
	
unsigned int kernel:1;     /* 1 if symbol is from kernel
                                    *  (only for external modules) **/
	
unsigned int preloaded:1;  /* 1 if symbol from Module.symvers, or crc */
	
enum export  export;       /* Type of export */
	
char name[0];
};


static struct symbol *symbolhash[SYMBOL_HASH_SIZE];

/* This is based on the hash agorithm from gdbm, via tdb */


static inline unsigned int tdb_hash(const char *name)
{
	unsigned value;	/* Used to compute the hash value.  */
	unsigned   i;	/* Used to cycle through random values. */

	/* Set the initial value from the key size. */
	for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
		value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));

	return (1103515243 * value + 12345);
}

Contributors
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kai germaschewski
kai germaschewski
82
100.00%
1
100.00%
Total
82
100.00%
1
100.00%

/**
 * Allocate a new symbols for use in the hash of exported symbols or
 * the list of unresolved symbols per module
 **/


static struct symbol *alloc_symbol(const char *name, unsigned int weak,
				   struct symbol *next)
{
	struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));

	memset(s, 0, sizeof(*s));
	strcpy(s->name, name);
	s->weak = weak;
	s->next = next;
	return s;
}

Contributors
Person
Tokens
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CommitProp
kai germaschewski
kai germaschewski
61
73.49%
1
25.00%
andrew morton
andrew morton
11
13.25%
1
25.00%
petr vandrovec*
petr vandrovec*
10
12.05%
1
25.00%
sam ravnborg
sam ravnborg
1
1.20%
1
25.00%
Total
83
100.00%
4
100.00%

/* For the hash of exported symbols */


static struct symbol *new_symbol(const char *name, struct module *module,
				 enum export export)
{
	unsigned int hash;
	struct symbol *new;

	hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
	new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
	new->module = module;
	new->export = export;
	return new;
}

Contributors
Person
Tokens
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CommitProp
kai germaschewski
kai germaschewski
33
44.59%
1
16.67%
andrew morton
andrew morton
23
31.08%
1
16.67%
ram pai
ram pai
10
13.51%
1
16.67%
sam ravnborg
sam ravnborg
6
8.11%
2
33.33%
petr vandrovec*
petr vandrovec*
2
2.70%
1
16.67%
Total
74
100.00%
6
100.00%



static struct symbol *find_symbol(const char *name)
{
	struct symbol *s;

	/* For our purposes, .foo matches foo.  PPC64 needs this. */
	if (name[0] == '.')
		name++;

	for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
		if (strcmp(s->name, name) == 0)
			return s;
	}
	return NULL;
}

Contributors
Person
Tokens
Prop
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CommitProp
kai germaschewski
kai germaschewski
72
97.30%
1
33.33%
sam ravnborg
sam ravnborg
1
1.35%
1
33.33%
keith m. wesolowski
keith m. wesolowski
1
1.35%
1
33.33%
Total
74
100.00%
3
100.00%

static const struct {
	
const char *str;
	
enum export export;
} 
export_list[] = {
	{ .str = "EXPORT_SYMBOL",            .export = export_plain },
	{ .str = "EXPORT_UNUSED_SYMBOL",     .export = export_unused },
	{ .str = "EXPORT_SYMBOL_GPL",        .export = export_gpl },
	{ .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
	{ .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
	{ .str = "(unknown)",                .export = export_unknown },
};




static const char *export_str(enum export ex)
{
	return export_list[ex].str;
}

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ram pai
ram pai
20
100.00%
1
100.00%
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20
100.00%
1
100.00%



static enum export export_no(const char *s)
{
	int i;

	if (!s)
		return export_unknown;
	for (i = 0; export_list[i].export != export_unknown; i++) {
		if (strcmp(export_list[i].str, s) == 0)
			return export_list[i].export;
	}
	return export_unknown;
}

Contributors
Person
Tokens
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CommitProp
ram pai
ram pai
62
88.57%
1
50.00%
sam ravnborg
sam ravnborg
8
11.43%
1
50.00%
Total
70
100.00%
2
100.00%

static const char *sec_name(struct elf_info *elf, int secindex);


#define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)



static enum export export_from_secname(struct elf_info *elf, unsigned int sec)
{
	const char *secname = sec_name(elf, sec);

	if (strstarts(secname, "___ksymtab+"))
		return export_plain;
	else if (strstarts(secname, "___ksymtab_unused+"))
		return export_unused;
	else if (strstarts(secname, "___ksymtab_gpl+"))
		return export_gpl;
	else if (strstarts(secname, "___ksymtab_unused_gpl+"))
		return export_unused_gpl;
	else if (strstarts(secname, "___ksymtab_gpl_future+"))
		return export_gpl_future;
	else
		return export_unknown;
}

Contributors
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alessio igor bogani
alessio igor bogani
96
100.00%
1
100.00%
Total
96
100.00%
1
100.00%



static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
{
	if (sec == elf->export_sec)
		return export_plain;
	else if (sec == elf->export_unused_sec)
		return export_unused;
	else if (sec == elf->export_gpl_sec)
		return export_gpl;
	else if (sec == elf->export_unused_gpl_sec)
		return export_unused_gpl;
	else if (sec == elf->export_gpl_future_sec)
		return export_gpl_future;
	else
		return export_unknown;
}

Contributors
Person
Tokens
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Commits
CommitProp
ram pai
ram pai
53
67.09%
1
33.33%
sam ravnborg
sam ravnborg
24
30.38%
1
33.33%
denys vlasenko
denys vlasenko
2
2.53%
1
33.33%
Total
79
100.00%
3
100.00%

/**
 * Add an exported symbol - it may have already been added without a
 * CRC, in this case just update the CRC
 **/


static struct symbol *sym_add_exported(const char *name, struct module *mod,
				       enum export export)
{
	struct symbol *s = find_symbol(name);

	if (!s) {
		s = new_symbol(name, mod, export);
	} else {
		if (!s->preloaded) {
			warn("%s: '%s' exported twice. Previous export "
			     "was in %s%s\n", mod->name, name,
			     s->module->name,
			     is_vmlinux(s->module->name) ?"":".ko");
		} else {
			/* In case Module.symvers was out of date */
			s->module = mod;
		}
	}
	s->preloaded = 0;
	s->vmlinux   = is_vmlinux(mod->name);
	s->kernel    = 0;
	s->export    = export;
	return s;
}

Contributors
Person
Tokens
Prop
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CommitProp
sam ravnborg
sam ravnborg
77
57.04%
4
44.44%
kai germaschewski
kai germaschewski
35
25.93%
1
11.11%
ram pai
ram pai
12
8.89%
1
11.11%
trent piepho
trent piepho
9
6.67%
1
11.11%
andrew morton
andrew morton
1
0.74%
1
11.11%
paul bolle
paul bolle
1
0.74%
1
11.11%
Total
135
100.00%
9
100.00%



static void sym_update_crc(const char *name, struct module *mod,
			   unsigned int crc, enum export export)
{
	struct symbol *s = find_symbol(name);

	if (!s) {
		s = new_symbol(name, mod, export);
		/* Don't complain when we find it later. */
		s->preloaded = 1;
	}
	s->crc = crc;
	s->crc_valid = 1;
}

Contributors
Person
Tokens
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CommitProp
kai germaschewski
kai germaschewski
41
57.75%
1
25.00%
sam ravnborg
sam ravnborg
15
21.13%
1
25.00%
rusty russell
rusty russell
9
12.68%
1
25.00%
ram pai
ram pai
6
8.45%
1
25.00%
Total
71
100.00%
4
100.00%



void *grab_file(const char *filename, unsigned long *size)
{
	struct stat st;
	void *map = MAP_FAILED;
	int fd;

	fd = open(filename, O_RDONLY);
	if (fd < 0)
		return NULL;
	if (fstat(fd, &st))
		goto failed;

	*size = st.st_size;
	map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);

failed:
	close(fd);
	if (map == MAP_FAILED)
		return NULL;
	return map;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
kai germaschewski
kai germaschewski
78
73.58%
2
33.33%
andrew morton
andrew morton
15
14.15%
3
50.00%
jesper juhl
jesper juhl
13
12.26%
1
16.67%
Total
106
100.00%
6
100.00%

/**
  * Return a copy of the next line in a mmap'ed file.
  * spaces in the beginning of the line is trimmed away.
  * Return a pointer to a static buffer.
  **/


char *get_next_line(unsigned long *pos, void *file, unsigned long size)
{
	static char line[4096];
	int skip = 1;
	size_t len = 0;
	signed char *p = (signed char *)file + *pos;
	char *s = line;

	for (; *pos < size ; (*pos)++) {
		if (skip && isspace(*p)) {
			p++;
			continue;
		}
		skip = 0;
		if (*p != '\n' && (*pos < size)) {
			len++;
			*s++ = *p++;
			if (len > 4095)
				break; /* Too long, stop */
		} else {
			/* End of string */
			*s = '\0';
			return line;
		}
	}
	/* End of buffer */
	return NULL;
}

Contributors
Person
Tokens
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CommitProp
andrew morton
andrew morton
142
98.61%
1
33.33%
tom rini
tom rini
2
1.39%
2
66.67%
Total
144
100.00%
3
100.00%



void release_file(void *file, unsigned long size)
{
	munmap(file, size);
}

Contributors
Person
Tokens
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CommitProp
andrew morton
andrew morton
15
75.00%
1
33.33%
kai germaschewski
kai germaschewski
4
20.00%
1
33.33%
sam ravnborg
sam ravnborg
1
5.00%
1
33.33%
Total
20
100.00%
3
100.00%



static int parse_elf(struct elf_info *info, const char *filename)
{
	unsigned int i;
	Elf_Ehdr *hdr;
	Elf_Shdr *sechdrs;
	Elf_Sym  *sym;
	const char *secstrings;
	unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;

	hdr = grab_file(filename, &info->size);
	if (!hdr) {
		if (ignore_missing_files) {
			fprintf(stderr, "%s: %s (ignored)\n", filename,
				strerror(errno));
			return 0;
		}
		perror(filename);
		exit(1);
	}
	info->hdr = hdr;
	if (info->size < sizeof(*hdr)) {
		/* file too small, assume this is an empty .o file */
		return 0;
	}
	/* Is this a valid ELF file? */
	if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
	    (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
	    (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
	    (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
		/* Not an ELF file - silently ignore it */
		return 0;
	}
	/* Fix endianness in ELF header */
	hdr->e_type      = TO_NATIVE(hdr->e_type);
	hdr->e_machine   = TO_NATIVE(hdr->e_machine);
	hdr->e_version   = TO_NATIVE(hdr->e_version);
	hdr->e_entry     = TO_NATIVE(hdr->e_entry);
	hdr->e_phoff     = TO_NATIVE(hdr->e_phoff);
	hdr->e_shoff     = TO_NATIVE(hdr->e_shoff);
	hdr->e_flags     = TO_NATIVE(hdr->e_flags);
	hdr->e_ehsize    = TO_NATIVE(hdr->e_ehsize);
	hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize);
	hdr->e_phnum     = TO_NATIVE(hdr->e_phnum);
	hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize);
	hdr->e_shnum     = TO_NATIVE(hdr->e_shnum);
	hdr->e_shstrndx  = TO_NATIVE(hdr->e_shstrndx);
	sechdrs = (void *)hdr + hdr->e_shoff;
	info->sechdrs = sechdrs;

	/* Check if file offset is correct */
	if (hdr->e_shoff > info->size) {
		fatal("section header offset=%lu in file '%s' is bigger than "
		      "filesize=%lu\n", (unsigned long)hdr->e_shoff,
		      filename, info->size);
		return 0;
	}

	if (hdr->e_shnum == SHN_UNDEF) {
		/*
                 * There are more than 64k sections,
                 * read count from .sh_size.
                 */
		info->num_sections = TO_NATIVE(sechdrs[0].sh_size);
	}
	else {
		info->num_sections = hdr->e_shnum;
	}
	if (hdr->e_shstrndx == SHN_XINDEX) {
		info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link);
	}
	else {
		info->secindex_strings = hdr->e_shstrndx;
	}

	/* Fix endianness in section headers */
	for (i = 0; i < info->num_sections; i++) {
		sechdrs[i].sh_name      = TO_NATIVE(sechdrs[i].sh_name);
		sechdrs[i].sh_type      = TO_NATIVE(sechdrs[i].sh_type);
		sechdrs[i].sh_flags     = TO_NATIVE(sechdrs[i].sh_flags);
		sechdrs[i].sh_addr      = TO_NATIVE(sechdrs[i].sh_addr);
		sechdrs[i].sh_offset    = TO_NATIVE(sechdrs[i].sh_offset);
		sechdrs[i].sh_size      = TO_NATIVE(sechdrs[i].sh_size);
		sechdrs[i].sh_link      = TO_NATIVE(sechdrs[i].sh_link);
		sechdrs[i].sh_info      = TO_NATIVE(sechdrs[i].sh_info);
		sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign);
		sechdrs[i].sh_entsize   = TO_NATIVE(sechdrs[i].sh_entsize);
	}
	/* Find symbol table. */
	secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
	for (i = 1; i < info->num_sections; i++) {
		const char *secname;
		int nobits = sechdrs[i].sh_type == SHT_NOBITS;

		if (!nobits && sechdrs[i].sh_offset > info->size) {
			fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
			      "sizeof(*hrd)=%zu\n", filename,
			      (unsigned long)sechdrs[i].sh_offset,
			      sizeof(*hdr));
			return 0;
		}
		secname = secstrings + sechdrs[i].sh_name;
		if (strcmp(secname, ".modinfo") == 0) {
			if (nobits)
				fatal("%s has NOBITS .modinfo\n", filename);
			info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
			info->modinfo_len = sechdrs[i].sh_size;
		} else if (strcmp(secname, "__ksymtab") == 0)
			info->export_sec = i;
		else if (strcmp(secname, "__ksymtab_unused") == 0)
			info->export_unused_sec = i;
		else if (strcmp(secname, "__ksymtab_gpl") == 0)
			info->export_gpl_sec = i;
		else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
			info->export_unused_gpl_sec = i;
		else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
			info->export_gpl_future_sec = i;

		if (sechdrs[i].sh_type == SHT_SYMTAB) {
			unsigned int sh_link_idx;
			symtab_idx = i;
			info->symtab_start = (void *)hdr +
			    sechdrs[i].sh_offset;
			info->symtab_stop  = (void *)hdr +
			    sechdrs[i].sh_offset + sechdrs[i].sh_size;
			sh_link_idx = sechdrs[i].sh_link;
			info->strtab       = (void *)hdr +
			    sechdrs[sh_link_idx].sh_offset;
		}

		/* 32bit section no. table? ("more than 64k sections") */
		if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
			symtab_shndx_idx = i;
			info->symtab_shndx_start = (void *)hdr +
			    sechdrs[i].sh_offset;
			info->symtab_shndx_stop  = (void *)hdr +
			    sechdrs[i].sh_offset + sechdrs[i].sh_size;
		}
	}
	if (!info->symtab_start)
		fatal("%s has no symtab?\n", filename);

	/* Fix endianness in symbols */
	for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
		sym->st_shndx = TO_NATIVE(sym->st_shndx);
		sym->st_name  = TO_NATIVE(sym->st_name);
		sym->st_value = TO_NATIVE(sym->st_value);
		sym->st_size  = TO_NATIVE(sym->st_size);
	}

	if (symtab_shndx_idx != ~0U) {
		Elf32_Word *p;
		if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link)
			fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
			      filename, sechdrs[symtab_shndx_idx].sh_link,
			      symtab_idx);
		/* Fix endianness */
		for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
		     p++)
			*p = TO_NATIVE(*p);
	}

	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
kai germaschewski
kai germaschewski
367
31.08%
2
10.53%
denys vlasenko
denys vlasenko
249
21.08%
1
5.26%
anders kaseorg
anders kaseorg
155
13.12%
2
10.53%
sam ravnborg
sam ravnborg
137
11.60%
6
31.58%
andrew morton
andrew morton
86
7.28%
2
10.53%
ram pai
ram pai
64
5.42%
1
5.26%
atsushi nemoto
atsushi nemoto
39
3.30%
1
5.26%
petr stetiar
petr stetiar
30
2.54%
1
5.26%
tejun heo
tejun heo
26
2.20%
1
5.26%
guenter roeck
guenter roeck
23
1.95%
1
5.26%
andi kleen
andi kleen
5
0.42%
1
5.26%
Total
1181
100.00%
19
100.00%



static void parse_elf_finish(struct elf_info *info)
{
	release_file(info->hdr, info->size);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
kai germaschewski
kai germaschewski
19
86.36%
2
50.00%
sam ravnborg
sam ravnborg
2
9.09%
1
25.00%
andrew morton
andrew morton
1
4.55%
1
25.00%
Total
22
100.00%
4
100.00%



static int ignore_undef_symbol(struct elf_info *info, const char *symname)
{
	/* ignore __this_module, it will be resolved shortly */
	if (strcmp(symname, VMLINUX_SYMBOL_STR(__this_module)) == 0)
		return 1;
	/* ignore global offset table */
	if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
		return 1;
	if (info->hdr->e_machine == EM_PPC)
		/* Special register function linked on all modules during final link of .ko */
		if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 ||
		    strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 ||
		    strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 ||
		    strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0 ||
		    strncmp(symname, "_restvr_", sizeof("_restvr_") - 1) == 0 ||
		    strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0)
			return 1;
	if (info->hdr->e_machine == EM_PPC64)
		/* Special register function linked on all modules during final link of .ko */
		if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 ||
		    strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0 ||
		    strncmp(symname, "_restvr_", sizeof("_restvr_") - 1) == 0 ||
		    strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0 ||
		    strcmp(symname, ".TOC.") == 0)
			return 1;
	/* Do not ignore this symbol */
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
129
50.79%
1
20.00%
andreas schwab
andreas schwab
64
25.20%
1
20.00%
stephen rothwell
stephen rothwell
48
18.90%
1
20.00%
alan modra
alan modra
9
3.54%
1
20.00%
rusty russell
rusty russell
4
1.57%
1
20.00%
Total
254
100.00%
5
100.00%


#define CRC_PFX     VMLINUX_SYMBOL_STR(__crc_)

#define KSYMTAB_PFX VMLINUX_SYMBOL_STR(__ksymtab_)



static void handle_modversions(struct module *mod, struct elf_info *info,
			       Elf_Sym *sym, const char *symname)
{
	unsigned int crc;
	enum export export;

	if ((!is_vmlinux(mod->name) || mod->is_dot_o) &&
	    strncmp(symname, "__ksymtab", 9) == 0)
		export = export_from_secname(info, get_secindex(info, sym));
	else
		export = export_from_sec(info, get_secindex(info, sym));

	/* CRC'd symbol */
	if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
		crc = (unsigned int) sym->st_value;
		sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
				export);
	}

	switch (sym->st_shndx) {
	case SHN_COMMON:
		if (!strncmp(symname, "__gnu_lto_", sizeof("__gnu_lto_")-1)) {
			/* Should warn here, but modpost runs before the linker */
		} else
			warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
		break;
	case SHN_UNDEF:
		/* undefined symbol */
		if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
		    ELF_ST_BIND(sym->st_info) != STB_WEAK)
			break;
		if (ignore_undef_symbol(info, symname))
			break;
/* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
#if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
/* add compatibility with older glibc */
#ifndef STT_SPARC_REGISTER

#define STT_SPARC_REGISTER STT_REGISTER
#endif
		if (info->hdr->e_machine == EM_SPARC ||
		    info->hdr->e_machine == EM_SPARCV9) {
			/* Ignore register directives. */
			if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
				break;
			if (symname[0] == '.') {
				char *munged = strdup(symname);
				munged[0] = '_';
				munged[1] = toupper(munged[1]);
				symname = munged;
			}
		}
#endif

#ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
		if (symname[0] != '_')
			break;
		else
			symname++;
#endif
		mod->unres = alloc_symbol(symname,
					  ELF_ST_BIND(sym->st_info) == STB_WEAK,
					  mod->unres);
		break;
	default:
		/* All exported symbols */
		if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
			sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
					export);
		}
		if (strcmp(symname, VMLINUX_SYMBOL_STR(init_module)) == 0)
			mod->has_init = 1;
		if (strcmp(symname, VMLINUX_SYMBOL_STR(cleanup_module)) == 0)
			mod->has_cleanup = 1;
		break;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
kai germaschewski
kai germaschewski
131
30.39%
4
16.67%
al viro
al viro
44
10.21%
1
4.17%
andi kleen
andi kleen
42
9.74%
2
8.33%
alessio igor bogani
alessio igor bogani
40
9.28%
1
4.17%
brian gerst
brian gerst
32
7.42%
1
4.17%
david s. miller
david s. miller
32
7.42%
1
4.17%
ben collins
ben collins
22
5.10%
1
4.17%
rusty russell
rusty russell
22
5.10%
1
4.17%
petr vandrovec*
petr vandrovec*
18
4.18%
1
4.17%
ram pai
ram pai
13
3.02%
1
4.17%
andrew morton
andrew morton
9
2.09%
2
8.33%
sam ravnborg
sam ravnborg
6
1.39%
3
12.50%
frank rowand
frank rowand
6
1.39%
1
4.17%
denys vlasenko
denys vlasenko
5
1.16%
1
4.17%
arnd bergmann
arnd bergmann
4
0.93%
1
4.17%
alan cox
alan cox
3
0.70%
1
4.17%
michal marek
michal marek
2
0.46%
1
4.17%
Total
431
100.00%
24
100.00%

/**
 * Parse tag=value strings from .modinfo section
 **/


static char *next_string(char *string, unsigned long *secsize)
{
	/* Skip non-zero chars */
	while (string[0]) {
		string++;
		if ((*secsize)-- <= 1)
			return NULL;
	}

	/* Skip any zero padding. */
	while (!string[0]) {
		string++;
		if ((*secsize)-- <= 1)
			return NULL;
	}
	return string;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
matt domsch
matt domsch
72
100.00%
1
100.00%
Total
72
100.00%
1
100.00%



static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
			      const char *tag, char *info)
{
	char *p;
	unsigned int taglen = strlen(tag);
	unsigned long size = modinfo_len;

	if (info) {
		size -= info - (char *)modinfo;
		modinfo = next_string(info, &size);
	}

	for (p = modinfo; p; p = next_string(p, &size)) {
		if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
			return p + taglen + 1;
	}
	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
matt domsch
matt domsch
88
73.95%
1
50.00%
sam ravnborg
sam ravnborg
31
26.05%
1
50.00%
Total
119
100.00%
2
100.00%



static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
			 const char *tag)

{
	return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
32
100.00%
1
100.00%
Total
32
100.00%
1
100.00%

/**
 * Test if string s ends in string sub
 * return 0 if match
 **/


static int strrcmp(const char *s, const char *sub)
{
	int slen, sublen;

	if (!s || !sub)
		return 1;

	slen = strlen(s);
	sublen = strlen(sub);

	if ((slen == 0) || (sublen == 0))
		return 1;

	if (sublen > slen)
		return 1;

	return memcmp(s + slen - sublen, sub, sublen);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
86
100.00%
1
100.00%
Total
86
100.00%
1
100.00%



static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
{
	if (sym)
		return elf->strtab + sym->st_name;
	else
		return "(unknown)";
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
34
100.00%
3
100.00%
Total
34
100.00%
3
100.00%



static const char *sec_name(struct elf_info *elf, int secindex)
{
	Elf_Shdr *sechdrs = elf->sechdrs;
	return (void *)elf->hdr +
		elf->sechdrs[elf->secindex_strings].sh_offset +
		sechdrs[secindex].sh_name;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
48
94.12%
1
50.00%
denys vlasenko
denys vlasenko
3
5.88%
1
50.00%
Total
51
100.00%
2
100.00%



static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
{
	return (void *)elf->hdr +
		elf->sechdrs[elf->secindex_strings].sh_offset +
		sechdr->sh_name;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
40
97.56%
1
50.00%
denys vlasenko
denys vlasenko
1
2.44%
1
50.00%
Total
41
100.00%
2
100.00%

/* The pattern is an array of simple patterns.
 * "foo" will match an exact string equal to "foo"
 * "*foo" will match a string that ends with "foo"
 * "foo*" will match a string that begins with "foo"
 * "*foo*" will match a string that contains "foo"
 */


static int match(const char *sym, const char * const pat[])
{
	const char *p;
	while (*pat) {
		p = *pat++;
		const char *endp = p + strlen(p) - 1;

		/* "*foo*" */
		if (*p == '*' && *endp == '*') {
			char *here, *bare = strndup(p + 1, strlen(p) - 2);

			here = strstr(sym, bare);
			free(bare);
			if (here != NULL)
				return 1;
		}
		/* "*foo" */
		else if (*p == '*') {
			if (strrcmp(sym, p + 1) == 0)
				return 1;
		}
		/* "foo*" */
		else if (*endp == '*') {
			if (strncmp(sym, p, strlen(p) - 1) == 0)
				return 1;
		}
		/* no wildcards */
		else {
			if (strcmp(p, sym) == 0)
				return 1;
		}
	}
	/* no match */
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
129
67.89%
2
50.00%
paul gortmaker
paul gortmaker
60
31.58%
1
25.00%
trevor keith
trevor keith
1
0.53%
1
25.00%
Total
190
100.00%
4
100.00%

/* sections that we do not want to do full section mismatch check on */

static const char *const section_white_list[] =
{
	".comment*",
	".debug*",
	".cranges",		/* sh64 */
	".zdebug*",		/* Compressed debug sections. */
	".GCC-command-line",	/* mn10300 */
	".GCC.command.line",	/* record-gcc-switches, non mn10300 */
	".mdebug*",        /* alpha, score, mips etc. */
	".pdr",            /* alpha, score, mips etc. */
	".stab*",
	".note*",
	".got*",
	".toc*",
	".xt.prop",				 /* xtensa */
	".xt.lit",         /* xtensa */
	".arcextmap*",			/* arc */
	".gnu.linkonce.arcext*",	/* arc : modules */
	".cmem*",			/* EZchip */
	".fmt_slot*",			/* EZchip */
	".gnu.lto*",
	NULL
};

/*
 * This is used to find sections missing the SHF_ALLOC flag.
 * The cause of this is often a section specified in assembler
 * without "ax" / "aw".
 */


static void check_section(const char *modname, struct elf_info *elf,
			  Elf_Shdr *sechdr)
{
	const char *sec = sech_name(elf, sechdr);

	if (sechdr->sh_type == SHT_PROGBITS &&
	    !(sechdr->sh_flags & SHF_ALLOC) &&
	    !match(sec, section_white_list)) {
		warn("%s (%s): unexpected non-allocatable section.\n"
		     "Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
		     "Note that for example <linux/init.h> contains\n"
		     "section definitions for use in .S files.\n\n",
		     modname, sec);
	}
}



Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
35
49.30%
1
33.33%
anders kaseorg
anders kaseorg
30
42.25%
1
33.33%
andi kleen
andi kleen
6
8.45%
1
33.33%
Total
71
100.00%
3
100.00%


#define ALL_INIT_DATA_SECTIONS \
	".init.setup", ".init.rodata", ".meminit.rodata", \
        ".init.data", ".meminit.data"

#define ALL_EXIT_DATA_SECTIONS \
	".exit.data", ".memexit.data"


#define ALL_INIT_TEXT_SECTIONS \
	".init.text", ".meminit.text"

#define ALL_EXIT_TEXT_SECTIONS \
	".exit.text", ".memexit.text"


#define ALL_PCI_INIT_SECTIONS	\
	".pci_fixup_early", ".pci_fixup_header", ".pci_fixup_final", \
        ".pci_fixup_enable", ".pci_fixup_resume", \
        ".pci_fixup_resume_early", ".pci_fixup_suspend"


#define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS

#define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS


#define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS

#define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS


#define DATA_SECTIONS ".data", ".data.rel"

#define TEXT_SECTIONS ".text", ".text.unlikely", ".sched.text", \
                ".kprobes.text"

#define OTHER_TEXT_SECTIONS ".ref.text", ".head.text", ".spinlock.text", \
                ".fixup", ".entry.text", ".exception.text", ".text.*", \
                ".coldtext"


#define INIT_SECTIONS      ".init.*"

#define MEM_INIT_SECTIONS  ".meminit.*"


#define EXIT_SECTIONS      ".exit.*"

#define MEM_EXIT_SECTIONS  ".memexit.*"


#define ALL_TEXT_SECTIONS  ALL_INIT_TEXT_SECTIONS, ALL_EXIT_TEXT_SECTIONS, \
                TEXT_SECTIONS, OTHER_TEXT_SECTIONS

/* init data sections */

static const char *const init_data_sections[] =
	{ ALL_INIT_DATA_SECTIONS, NULL };

/* all init sections */

static const char *const init_sections[] = { ALL_INIT_SECTIONS, NULL };

/* All init and exit sections (code + data) */

static const char *const init_exit_sections[] =
	{ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };

/* all text sections */

static const char *const text_sections[] = { ALL_TEXT_SECTIONS, NULL };

/* data section */

static const char *const data_sections[] = { DATA_SECTIONS, NULL };


/* symbols in .data that may refer to init/exit sections */

#define DEFAULT_SYMBOL_WHITE_LIST					\
	"*driver",                                                      \
        "*_template", /* scsi uses *_template a lot */			\
        "*_timer",    /* arm uses ops structures named _timer a lot */	\
        "*_sht",      /* scsi also used *_sht to some extent */		\
        "*_ops",                                                        \
        "*_probe",                                                      \
        "*_probe_one",                                                  \
        "*_console"


static const char *const head_sections[] = { ".head.text*", NULL };

static const char *const linker_symbols[] =
	{ "__init_begin", "_sinittext", "_einittext", NULL };

static const char *const optim_symbols[] = { "*.constprop.*", NULL };


enum mismatch {
	
TEXT_TO_ANY_INIT,
	
DATA_TO_ANY_INIT,
	
TEXT_TO_ANY_EXIT,
	
DATA_TO_ANY_EXIT,
	
XXXINIT_TO_SOME_INIT,
	
XXXEXIT_TO_SOME_EXIT,
	
ANY_INIT_TO_ANY_EXIT,
	
ANY_EXIT_TO_ANY_INIT,
	
EXPORT_TO_INIT_EXIT,
	
EXTABLE_TO_NON_TEXT,
};

/**
 * Describe how to match sections on different criterias:
 *
 * @fromsec: Array of sections to be matched.
 *
 * @bad_tosec: Relocations applied to a section in @fromsec to a section in
 * this array is forbidden (black-list).  Can be empty.
 *
 * @good_tosec: Relocations applied to a section in @fromsec must be
 * targetting sections in this array (white-list).  Can be empty.
 *
 * @mismatch: Type of mismatch.
 *
 * @symbol_white_list: Do not match a relocation to a symbol in this list
 * even if it is targetting a section in @bad_to_sec.
 *
 * @handler: Specific handler to call when a match is found.  If NULL,
 * default_mismatch_handler() will be called.
 *
 */

struct sectioncheck {
	
const char *fromsec[20];
	
const char *bad_tosec[20];
	
const char *good_tosec[20];
	
enum mismatch mismatch;
	
const char *symbol_white_list[20];
	
void (*handler)(const char *modname, struct elf_info *elf,
			const struct sectioncheck* const mismatch,
			Elf_Rela *r, Elf_Sym *sym, const char *fromsec);

};

static void extable_mismatch_handler(const char *modname, struct elf_info *elf,
				     const struct sectioncheck* const mismatch,
				     Elf_Rela *r, Elf_Sym *sym,
				     const char *fromsec);


static const struct sectioncheck sectioncheck[] = {
/* Do not reference init/exit code/data from
 * normal code and data
 */
{
	.fromsec = { TEXT_SECTIONS, NULL },
	.bad_tosec = { ALL_INIT_SECTIONS, NULL },
	.mismatch = TEXT_TO_ANY_INIT,
	.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
{
	.fromsec = { DATA_SECTIONS, NULL },
	.bad_tosec = { ALL_XXXINIT_SECTIONS, NULL },
	.mismatch = DATA_TO_ANY_INIT,
	.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
{
	.fromsec = { DATA_SECTIONS, NULL },
	.bad_tosec = { INIT_SECTIONS, NULL },
	.mismatch = DATA_TO_ANY_INIT,
	.symbol_white_list = {
		"*_template", "*_timer", "*_sht", "*_ops",
		"*_probe", "*_probe_one", "*_console", NULL
	},
},
{
	.fromsec = { TEXT_SECTIONS, NULL },
	.bad_tosec = { ALL_EXIT_SECTIONS, NULL },
	.mismatch = TEXT_TO_ANY_EXIT,
	.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
{
	.fromsec = { DATA_SECTIONS, NULL },
	.bad_tosec = { ALL_EXIT_SECTIONS, NULL },
	.mismatch = DATA_TO_ANY_EXIT,
	.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
/* Do not reference init code/data from meminit code/data */
{
	.fromsec = { ALL_XXXINIT_SECTIONS, NULL },
	.bad_tosec = { INIT_SECTIONS, NULL },
	.mismatch = XXXINIT_TO_SOME_INIT,
	.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
/* Do not reference exit code/data from memexit code/data */
{
	.fromsec = { ALL_XXXEXIT_SECTIONS, NULL },
	.bad_tosec = { EXIT_SECTIONS, NULL },
	.mismatch = XXXEXIT_TO_SOME_EXIT,
	.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
/* Do not use exit code/data from init code */
{
	.fromsec = { ALL_INIT_SECTIONS, NULL },
	.bad_tosec = { ALL_EXIT_SECTIONS, NULL },
	.mismatch = ANY_INIT_TO_ANY_EXIT,
	.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
/* Do not use init code/data from exit code */
{
	.fromsec = { ALL_EXIT_SECTIONS, NULL },
	.bad_tosec = { ALL_INIT_SECTIONS, NULL },
	.mismatch = ANY_EXIT_TO_ANY_INIT,
	.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
{
	.fromsec = { ALL_PCI_INIT_SECTIONS, NULL },
	.bad_tosec = { INIT_SECTIONS, NULL },
	.mismatch = ANY_INIT_TO_ANY_EXIT,
	.symbol_white_list = { NULL },
},
/* Do not export init/exit functions or data */
{
	.fromsec = { "__ksymtab*", NULL },
	.bad_tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
	.mismatch = EXPORT_TO_INIT_EXIT,
	.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
},
{
	.fromsec = { "__ex_table", NULL },
	/* If you're adding any new black-listed sections in here, consider
         * adding a special 'printer' for them in scripts/check_extable.
         */
	.bad_tosec = { ".altinstr_replacement", NULL },
	.good_tosec = {ALL_TEXT_SECTIONS , NULL},
	.mismatch = EXTABLE_TO_NON_TEXT,
	.handler = extable_mismatch_handler,
}
};



static const struct sectioncheck *section_mismatch(
		const char *fromsec, const char *tosec)
{
	int i;
	int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
	const struct sectioncheck *check = &sectioncheck[0];

	/*
         * The target section could be the SHT_NUL section when we're
         * handling relocations to un-resolved symbols, trying to match it
         * doesn't make much sense and causes build failures on parisc and
         * mn10300 architectures.
         */
	if (*tosec == '\0')
		return NULL;

	for (i = 0; i < elems; i++) {
		if (match(fromsec, check->fromsec)) {
			if (check->bad_tosec[0] && match(tosec, check->bad_tosec))
				return check;
			if (check->good_tosec[0] && !match(tosec, check->good_tosec))
				return check;
		}
		check++;
	}
	return NULL;
}

Contributors
Person
Tokens
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Commits
CommitProp
sam ravnborg
sam ravnborg
82
60.29%
4
44.44%
quentin casasnovas
quentin casasnovas
44
32.35%
2
22.22%
uwe kleine-koenig
uwe kleine-koenig
5
3.68%
1
11.11%
jan beulich
jan beulich
3
2.21%
1
11.11%
magnus damm
magnus damm
2
1.47%
1
11.11%
Total
136
100.00%
9
100.00%

/**
 * Whitelist to allow certain references to pass with no warning.
 *
 * Pattern 1:
 *   If a module parameter is declared __initdata and permissions=0
 *   then this is legal despite the warning generated.
 *   We cannot see value of permissions here, so just ignore
 *   this pattern.
 *   The pattern is identified by:
 *   tosec   = .init.data
 *   fromsec = .data*
 *   atsym   =__param*
 *
 * Pattern 1a:
 *   module_param_call() ops can refer to __init set function if permissions=0
 *   The pattern is identified by:
 *   tosec   = .init.text
 *   fromsec = .data*
 *   atsym   = __param_ops_*
 *
 * Pattern 2:
 *   Many drivers utilise a *driver container with references to
 *   add, remove, probe functions etc.
 *   the pattern is identified by:
 *   tosec   = init or exit section
 *   fromsec = data section
 *   atsym = *driver, *_template, *_sht, *_ops, *_probe,
 *           *probe_one, *_console, *_timer
 *
 * Pattern 3:
 *   Whitelist all references from .head.text to any init section
 *
 * Pattern 4:
 *   Some symbols belong to init section but still it is ok to reference
 *   these from non-init sections as these symbols don't have any memory
 *   allocated for them and symbol address and value are same. So even
 *   if init section is freed, its ok to reference those symbols.
 *   For ex. symbols marking the init section boundaries.
 *   This pattern is identified by
 *   refsymname = __init_begin, _sinittext, _einittext
 *
 * Pattern 5:
 *   GCC may optimize static inlines when fed constant arg(s) resulting
 *   in functions like cpumask_empty() -- generating an associated symbol
 *   cpumask_empty.constprop.3 that appears in the audit.  If the const that
 *   is passed in comes from __init, like say nmi_ipi_mask, we get a
 *   meaningless section warning.  May need to add isra symbols too...
 *   This pattern is identified by
 *   tosec   = init section
 *   fromsec = text section
 *   refsymname = *.constprop.*
 *
 **/


static int secref_whitelist(const struct sectioncheck *mismatch,
			    const char *fromsec, const char *fromsym,
			    const char *tosec, const char *tosym)
{
	/* Check for pattern 1 */
	if (match(tosec, init_data_sections) &&
	    match(fromsec, data_sections) &&
	    (strncmp(fromsym, "__param", strlen("__param")) == 0))
		return 0;

	/* Check for pattern 1a */
	if (strcmp(tosec, ".init.text") == 0 &&
	    match(fromsec, data_sections) &&
	    (strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0))
		return 0;

	/* Check for pattern 2 */
	if (match(tosec, init_exit_sections) &&
	    match(fromsec, data_sections) &&
	    match(fromsym, mismatch->symbol_white_list))
		return 0;

	/* Check for pattern 3 */
	if (match(fromsec, head_sections) &&
	    match(tosec, init_sections))
		return 0;

	/* Check for pattern 4 */
	if (match(tosym, linker_symbols))
		return 0;

	/* Check for pattern 5 */
	if (match(fromsec, text_sections) &&
	    match(tosec, init_sections) &&
	    match(fromsym, optim_symbols))
		return 0;

	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
110
55.56%
6
60.00%
rusty russell
rusty russell
38
19.19%
1
10.00%
paul gortmaker
paul gortmaker
27
13.64%
1
10.00%
david brownell
david brownell
15
7.58%
1
10.00%
uwe kleine-koenig
uwe kleine-koenig
8
4.04%
1
10.00%
Total
198
100.00%
10
100.00%

/**
 * Find symbol based on relocation record info.
 * In some cases the symbol supplied is a valid symbol so
 * return refsym. If st_name != 0 we assume this is a valid symbol.
 * In other cases the symbol needs to be looked up in the symbol table
 * based on section and address.
 *  **/


static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
				Elf_Sym *relsym)
{
	Elf_Sym *sym;
	Elf_Sym *near = NULL;
	Elf64_Sword distance = 20;
	Elf64_Sword d;
	unsigned int relsym_secindex;

	if (relsym->st_name != 0)
		return relsym;

	relsym_secindex = get_secindex(elf, relsym);
	for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
		if (get_secindex(elf, sym) != relsym_secindex)
			continue;
		if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
			continue;
		if (sym->st_value == addr)
			return sym;
		/* Find a symbol nearby - addr are maybe negative */
		d = sym->st_value - addr;
		if (d < 0)
			d = addr - sym->st_value;
		if (d < distance) {
			distance = d;
			near = sym;
		}
	}
	/* We need a close match */
	if (distance < 20)
		return near;
	else
		return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
142
84.52%
3
60.00%
denys vlasenko
denys vlasenko
19
11.31%
1
20.00%
david brownell
david brownell
7
4.17%
1
20.00%
Total
168
100.00%
5
100.00%



static inline int is_arm_mapping_symbol(const char *str)
{
	return str[0] == '$' && strchr("axtd", str[1])
	       && (str[2] == '\0' || str[2] == '.');
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
45
97.83%
2
66.67%
kyle mcmartin
kyle mcmartin
1
2.17%
1
33.33%
Total
46
100.00%
3
100.00%

/*
 * If there's no name there, ignore it; likewise, ignore it if it's
 * one of the magic symbols emitted used by current ARM tools.
 *
 * Otherwise if find_symbols_between() returns those symbols, they'll
 * fail the whitelist tests and cause lots of false alarms ... fixable
 * only by merging __exit and __init sections into __text, bloating
 * the kernel (which is especially evil on embedded platforms).
 */


static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
{
	const char *name = elf->strtab + sym->st_name;

	if (!name || !strlen(name))
		return 0;
	return !is_arm_mapping_symbol(name);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
50
100.00%
2
100.00%
Total
50
100.00%
2
100.00%

/*
 * Find symbols before or equal addr and after addr - in the section sec.
 * If we find two symbols with equal offset prefer one with a valid name.
 * The ELF format may have a better way to detect what type of symbol
 * it is, but this works for now.
 **/


static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
				 const char *sec)
{
	Elf_Sym *sym;
	Elf_Sym *near = NULL;
	Elf_Addr distance = ~0;

	for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
		const char *symsec;

		if (is_shndx_special(sym->st_shndx))
			continue;
		symsec = sec_name(elf, get_secindex(elf, sym));
		if (strcmp(symsec, sec) != 0)
			continue;
		if (!is_valid_name(elf, sym))
			continue;
		if (sym->st_value <= addr) {
			if ((addr - sym->st_value) < distance) {
				distance = addr - sym->st_value;
				near = sym;
			} else if ((addr - sym->st_value) == distance) {
				near = sym;
			}
		}
	}
	return near;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
152
92.12%
6
60.00%
denys vlasenko
denys vlasenko
8
4.85%
1
10.00%
russell king
russell king
2
1.21%
1
10.00%
stephen rothwell
stephen rothwell
2
1.21%
1
10.00%
vivek goyal
vivek goyal
1
0.61%
1
10.00%
Total
165
100.00%
10
100.00%

/*
 * Convert a section name to the function/data attribute
 * .init.text => __init
 * .memexitconst => __memconst
 * etc.
 *
 * The memory of returned value has been allocated on a heap. The user of this
 * method should free it after usage.
*/


static char *sec2annotation(const char *s)
{
	if (match(s, init_exit_sections)) {
		char *p = malloc(20);
		char *r = p;

		*p++ = '_';
		*p++ = '_';
		if (*s == '.')
			s++;
		while (*s && *s != '.')
			*p++ = *s++;
		*p = '\0';
		if (*s == '.')
			s++;
		if (strstr(s, "rodata") != NULL)
			strcat(p, "const ");
		else if (strstr(s, "data") != NULL)
			strcat(p, "data ");
		else
			strcat(p, " ");
		return r;
	} else {
		return strdup("");
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
144
96.00%
5
71.43%
andrew morton
andrew morton
3
2.00%
1
14.29%
atsushi nemoto
atsushi nemoto
3
2.00%
1
14.29%
Total
150
100.00%
7
100.00%



static int is_function(Elf_Sym *sym)
{
	if (sym)
		return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
	else
		return -1;
}

Contributors
Person
Tokens
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CommitProp
sam ravnborg
sam ravnborg
29
100.00%
2
100.00%
Total
29
100.00%
2
100.00%



static void print_section_list(const char * const list[20])
{
	const char *const *s = list;

	while (*s) {
		fprintf(stderr, "%s", *s);
		s++;
		if (*s)
			fprintf(stderr, ", ");
	}
	fprintf(stderr, "\n");
}

Contributors
Person
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CommitProp
randy dunlap
randy dunlap
63
100.00%
1
100.00%
Total
63
100.00%
1
100.00%



static inline void get_pretty_name(int is_func, const char** name, const char** name_p)
{
	switch (is_func) {
	case 0:	*name = "variable"; *name_p = ""; break;
	case 1:	*name = "function"; *name_p = "()"; break;
	default: *name = "(unknown reference)"; *name_p = ""; break;
	}
}

Contributors
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Tokens
Prop
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CommitProp
quentin casasnovas
quentin casasnovas
68
100.00%
1
100.00%
Total
68
100.00%
1
100.00%

/*
 * Print a warning about a section mismatch.
 * Try to find symbols near it so user can find it.
 * Check whitelist before warning - it may be a false positive.
 */


static void report_sec_mismatch(const char *modname,
				const struct sectioncheck *mismatch,
				const char *fromsec,
				unsigned long long fromaddr,
				const char *fromsym,
				int from_is_func,
				const char *tosec, const char *tosym,
				int to_is_func)
{
	const char *from, *from_p;
	const char *to, *to_p;
	char *prl_from;
	char *prl_to;

	sec_mismatch_count++;
	if (!sec_mismatch_verbose)
		return;

	get_pretty_name(from_is_func, &from, &from_p);
	get_pretty_name(to_is_func, &to, &to_p);

	warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
	     "to the %s %s:%s%s\n",
	     modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
	     tosym, to_p);

	switch (mismatch->mismatch) {
	case TEXT_TO_ANY_INIT:
		prl_from = sec2annotation(fromsec);
		prl_to = sec2annotation(tosec);
		fprintf(stderr,
		"The function %s%s() references\n"
		"the %s %s%s%s.\n"
		"This is often because %s lacks a %s\n"
		"annotation or the annotation of %s is wrong.\n",
		prl_from, fromsym,
		to, prl_to, tosym, to_p,
		fromsym, prl_to, tosym);
		free(prl_from);
		free(prl_to);
		break;
	case DATA_TO_ANY_INIT: {
		prl_to = sec2annotation(tosec);
		fprintf(stderr,
		"The variable %s references\n"
		"the %s %s%s%s\n"
		"If the reference is valid then annotate the\n"
		"variable with __init* or __refdata (see linux/init.h) "
		"or name the variable:\n",
		fromsym, to, prl_to, tosym, to_p);
		print_section_list(mismatch->symbol_white_list);
		free(prl_to);
		break;
	}
	case TEXT_TO_ANY_EXIT:
		prl_to = sec2annotation(tosec);
		fprintf(stderr,
		"The function %s() references a %s in an exit section.\n"
		"Often the %s %s%s has valid usage outside the exit section\n"
		"and the fix is to remove the %sannotation of %s.\n",
		fromsym, to, to, tosym, to_p, prl_to, tosym);
		free(prl_to);
		break;
	case DATA_TO_ANY_EXIT: {
		prl_to = sec2annotation(tosec);
		fprintf(stderr,
		"The variable %s references\n"
		"the %s %s%s%s\n"
		"If the reference is valid then annotate the\n"
		"variable with __exit* (see linux/init.h) or "
		"name the variable:\n",
		fromsym, to, prl_to, tosym, to_p);
		print_section_list(mismatch->symbol_white_list);
		free(prl_to);
		break;
	}
	case XXXINIT_TO_SOME_INIT:
	case XXXEXIT_TO_SOME_EXIT:
		prl_from = sec2annotation(fromsec);
		prl_to = sec2annotation(tosec);
		fprintf(stderr,
		"The %s %s%s%s references\n"
		"a %s %s%s%s.\n"
		"If %s is only used by %s then\n"
		"annotate %s with a matching annotation.\n",
		from, prl_from, fromsym, from_p,
		to, prl_to, tosym, to_p,
		tosym, fromsym, tosym);
		free(prl_from);
		free(prl_to);
		break;
	case ANY_INIT_TO_ANY_EXIT:
		prl_from = sec2annotation(fromsec);
		prl_to = sec2annotation(tosec);
		fprintf(stderr,
		"The %s %s%s%s references\n"
		"a %s %s%s%s.\n"
		"This is often seen when error handling "
		"in the init function\n"
		"uses functionality in the exit path.\n"
		"The fix is often to remove the %sannotation of\n"
		"%s%s so it may be used outside an exit section.\n",
		from, prl_from, fromsym, from_p,
		to, prl_to, tosym, to_p,
		prl_to, tosym, to_p);
		free(prl_from);
		free(prl_to);
		break;
	case ANY_EXIT_TO_ANY_INIT:
		prl_from = sec2annotation(fromsec);
		prl_to = sec2annotation(tosec);
		fprintf(stderr,
		"The %s %s%s%s references\n"
		"a %s %s%s%s.\n"
		"This is often seen when error handling "
		"in the exit function\n"
		"uses functionality in the init path.\n"
		"The fix is often to remove the %sannotation of\n"
		"%s%s so it may be used outside an init section.\n",
		from, prl_from, fromsym, from_p,
		to, prl_to, tosym, to_p,
		prl_to, tosym, to_p);
		free(prl_from);
		free(prl_to);
		break;
	case EXPORT_TO_INIT_EXIT:
		prl_to = sec2annotation(tosec);
		fprintf(stderr,
		"The symbol %s is exported and annotated %s\n"
		"Fix this by removing the %sannotation of %s "
		"or drop the export.\n",
		tosym, prl_to, prl_to, tosym);
		free(prl_to);
		break;
	case EXTABLE_TO_NON_TEXT:
		fatal("There's a special handler for this mismatch type, "
		      "we should never get here.");
		break;
	}
	fprintf(stderr, "\n");
}

Contributors
Person
Tokens
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CommitProp
sam ravnborg
sam ravnborg
336
59.68%
5
35.71%
alexey fomenko
alexey fomenko
167
29.66%
1
7.14%
quentin casasnovas
quentin casasnovas
32
5.68%
2
14.29%
uwe kleine-koenig
uwe kleine-koenig
14
2.49%
2
14.29%
randy dunlap
randy dunlap
8
1.42%
1
7.14%
geert uytterhoeven
geert uytterhoeven
5
0.89%
2
14.29%
andrew morton
andrew morton
1
0.18%
1
7.14%
Total
563
100.00%
14
100.00%



static void default_mismatch_handler(const char *modname, struct elf_info *elf,
				     const struct sectioncheck* const mismatch,
				     Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
{
	const char *tosec;
	Elf_Sym *to;
	Elf_Sym *from;
	const char *tosym;
	const char *fromsym;

	from = find_elf_symbol2(elf, r->r_offset, fromsec);
	fromsym = sym_name(elf, from);

	if (!strncmp(fromsym, "reference___initcall",
		     sizeof("reference___initcall")-1))
		return;

	tosec = sec_name(elf, get_secindex(elf, sym));
	to = find_elf_symbol(elf, r->r_addend, sym);
	tosym = sym_name(elf, to);

	/* check whitelist - we may ignore it */
	if (secref_whitelist(mismatch,
			     fromsec, fromsym, tosec, tosym)) {
		report_sec_mismatch(modname, mismatch,
				    fromsec, r->r_offset, fromsym,
				    is_function(from), tosec, tosym,
				    is_function(to));
	}
}

Contributors
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Tokens
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CommitProp
sam ravnborg
sam ravnborg
129
70.88%
6
60.00%
quentin casasnovas
quentin casasnovas
40
21.98%
2
20.00%
atsushi nemoto
atsushi nemoto
11
6.04%
1
10.00%
uwe kleine-koenig
uwe kleine-koenig
2
1.10%
1
10.00%
Total
182
100.00%
10
100.00%



static int is_executable_section(struct elf_info* elf, unsigned int section_index)
{
	if (section_index > elf->num_sections)
		fatal("section_index is outside elf->num_sections!\n");

	return ((elf->sechdrs[section_index].sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR);
}

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quentin casasnovas
quentin casasnovas
46
100.00%
1
100.00%
Total
46
100.00%
1
100.00%

/*
 * We rely on a gross hack in section_rel[a]() calling find_extable_entry_size()
 * to know the sizeof(struct exception_table_entry) for the target architecture.
 */

static unsigned int extable_entry_size = 0;


static void find_extable_entry_size(const char* const sec, const Elf_Rela* r)
{
	/*
         * If we're currently checking the second relocation within __ex_table,
         * that relocation offset tells us the offsetof(struct
         * exception_table_entry, fixup) which is equal to sizeof(struct
         * exception_table_entry) divided by two.  We use that to our advantage
         * since there's no portable way to get that size as every architecture
         * seems to go with different sized types.  Not pretty but better than
         * hard-coding the size for every architecture..
         */
	if (!extable_entry_size)
		extable_entry_size = r->r_offset * 2;
}

Contributors
Person
Tokens
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quentin casasnovas
quentin casasnovas
31
100.00%
2
100.00%
Total
31
100.00%
2
100.00%



static inline bool is_extable_fault_address(Elf_Rela *r)
{
	/*
         * extable_entry_size is only discovered after we've handled the
         * _second_ relocation in __ex_table, so only abort when we're not
         * handling the first reloc and extable_entry_size is zero.
         */
	if (r->r_offset && extable_entry_size == 0)
		fatal("extable_entry size hasn't been discovered!\n");

	return ((r->r_offset == 0) ||
		(r->r_offset % extable_entry_size == 0));
}

Contributors
Person
Tokens
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quentin casasnovas
quentin casasnovas
48
100.00%
2
100.00%
Total
48
100.00%
2
100.00%


#define is_second_extable_reloc(Start, Cur, Sec)			\
	(((Cur) == (Start) + 1) && (strcmp("__ex_table", (Sec)) == 0))



static void report_extable_warnings(const char* modname, struct elf_info* elf,
				    const struct sectioncheck* const mismatch,
				    Elf_Rela* r, Elf_Sym* sym,
				    const char* fromsec, const char* tosec)
{
	Elf_Sym* fromsym = find_elf_symbol2(elf, r->r_offset, fromsec);
	const char* fromsym_name = sym_name(elf, fromsym);
	Elf_Sym* tosym = find_elf_symbol(elf, r->r_addend, sym);
	const char* tosym_name = sym_name(elf, tosym);
	const char* from_pretty_name;
	const char* from_pretty_name_p;
	const char* to_pretty_name;
	const char* to_pretty_name_p;

	get_pretty_name(is_function(fromsym),
			&from_pretty_name, &from_pretty_name_p);
	get_pretty_name(is_function(tosym),
			&to_pretty_name, &to_pretty_name_p);

	warn("%s(%s+0x%lx): Section mismatch in reference"
	     " from the %s %s%s to the %s %s:%s%s\n",
	     modname, fromsec, (long)r->r_offset, from_pretty_name,
	     fromsym_name, from_pretty_name_p,
	     to_pretty_name, tosec, tosym_name, to_pretty_name_p);

	if (!match(tosec, mismatch->bad_tosec) &&
	    is_executable_section(elf, get_secindex(elf, sym)))
		fprintf(stderr,
			"The relocation at %s+0x%lx references\n"
			"section \"%s\" which is not in the list of\n"
			"authorized sections.  If you're adding a new section\n"
			"and/or if this reference is valid, add \"%s\" to the\n"
			"list of authorized sections to jump to on fault.\n"
			"This can be achieved by adding \"%s\" to \n"
			"OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n",
			fromsec, (long)r->r_offset, tosec, tosec, tosec);
}

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quentin casasnovas
quentin casasnovas
226
100.00%
2
100.00%
Total
226
100.00%
2
100.00%



static void extable_mismatch_handler(const char* modname, struct elf_info *elf,
				     const struct sectioncheck* const mismatch,
				     Elf_Rela* r, Elf_Sym* sym,
				     const char *fromsec)
{
	const char* tosec = sec_name(elf, get_secindex(elf, sym));

	sec_mismatch_count++;

	if (sec_mismatch_verbose)
		report_extable_warnings(modname, elf, mismatch, r, sym,
					fromsec, tosec);

	if (match(tosec, mismatch->bad_tosec))
		fatal("The relocation at %s+0x%lx references\n"
		      "section \"%s\" which is black-listed.\n"
		      "Something is seriously wrong and should be fixed.\n"
		      "You might get more information about where this is\n"
		      "coming from by using scripts/check_extable.sh %s\n",
		      fromsec, (long)r->r_offset, tosec, modname);
	else if (!is_executable_section(elf, get_secindex(elf, sym))) {
		if (is_extable_fault_address(r))
			fatal("The relocation at %s+0x%lx references\n"
			      "section \"%s\" which is not executable, IOW\n"
			      "it is not possible for the kernel to fault\n"
			      "at that address.  Something is seriously wrong\n"
			      "and should be fixed.\n",
			      fromsec, (long)r->r_offset, tosec);
		else
			fatal("The relocation at %s+0x%lx references\n"
			      "section \"%s\" which is not executable, IOW\n"
			      "the kernel will fault if it ever tries to\n"
			      "jump to it.  Something is seriously wrong\n"
			      "and should be fixed.\n",
			      fromsec, (long)r->r_offset, tosec);
	}
}

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quentin casasnovas
quentin casasnovas
176
100.00%
1
100.00%
Total
176
100.00%
1
100.00%



static void check_section_mismatch(const char *modname, struct elf_info *elf,
				   Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
{
	const char *tosec = sec_name(elf, get_secindex(elf, sym));;
	const struct sectioncheck *mismatch = section_mismatch(fromsec, tosec);

	if (mismatch) {
		if (mismatch->handler)
			mismatch->handler(modname, elf,  mismatch,
					  r, sym, fromsec);
		else
			default_mismatch_handler(modname, elf, mismatch,
						 r, sym, fromsec);
	}
}

Contributors
Person
Tokens
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CommitProp
quentin casasnovas
quentin casasnovas
104
99.05%
2
66.67%
sam ravnborg
sam ravnborg
1
0.95%
1
33.33%
Total
105
100.00%
3
100.00%



static unsigned int *reloc_location(struct elf_info *elf,
				    Elf_Shdr *sechdr, Elf_Rela *r)
{
	Elf_Shdr *sechdrs = elf->sechdrs;
	int section = sechdr->sh_info;

	return (void *)elf->hdr + sechdrs[section].sh_offset +
		r->r_offset;
}

Contributors
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Tokens
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CommitProp
sam ravnborg
sam ravnborg
29
51.79%
2
66.67%
atsushi nemoto
atsushi nemoto
27
48.21%
1
33.33%
Total
56
100.00%
3
100.00%



static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
{
	unsigned int r_typ = ELF_R_TYPE(r->r_info);
	unsigned int *location = reloc_location(elf, sechdr, r);

	switch (r_typ) {
	case R_386_32:
		r->r_addend = TO_NATIVE(*location);
		break;
	case R_386_PC32:
		r->r_addend = TO_NATIVE(*location) + 4;
		/* For CONFIG_RELOCATABLE=y */
		if (elf->hdr->e_type == ET_EXEC)
			r->r_addend += r->r_offset;
		break;
	}
	return 0;
}

Contributors
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Tokens
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CommitProp
sam ravnborg
sam ravnborg
96
94.12%
3
75.00%
atsushi nemoto
atsushi nemoto
6
5.88%
1
25.00%
Total
102
100.00%
4
100.00%

#ifndef R_ARM_CALL

#define R_ARM_CALL	28
#endif
#ifndef R_ARM_JUMP24

#define R_ARM_JUMP24	29
#endif

#ifndef	R_ARM_THM_CALL

#define	R_ARM_THM_CALL		10
#endif
#ifndef	R_ARM_THM_JUMP24

#define	R_ARM_THM_JUMP24	30
#endif
#ifndef	R_ARM_THM_JUMP19

#define	R_ARM_THM_JUMP19	51
#endif



static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
{
	unsigned int r_typ = ELF_R_TYPE(r->r_info);

	switch (r_typ) {
	case R_ARM_ABS32:
		/* From ARM ABI: (S + A) | T */
		r->r_addend = (int)(long)
			      (elf->symtab_start + ELF_R_SYM(r->r_info));
		break;
	case R_ARM_PC24:
	case R_ARM_CALL:
	case R_ARM_JUMP24:
	case R_ARM_THM_CALL:
	case R_ARM_THM_JUMP24:
	case R_ARM_THM_JUMP19:
		/* From ARM ABI: ((S + A) | T) - P */
		r->r_addend = (int)(long)(elf->hdr +
			      sechdr->sh_offset +
			      (r->r_offset - sechdr->sh_addr));
		break;
	default:
		return 1;
	}
	return 0;
}

Contributors
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CommitProp
sam ravnborg
sam ravnborg
84
69.42%
1
20.00%
atsushi nemoto
atsushi nemoto
22
18.18%
2
40.00%
david a. long
david a. long
9
7.44%
1
20.00%
tony lindgren
tony lindgren
6
4.96%
1
20.00%
Total
121
100.00%
5
100.00%



static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
{
	unsigned int r_typ = ELF_R_TYPE(r->r_info);
	unsigned int *location = reloc_location(elf, sechdr, r);
	unsigned int inst;

	if (r_typ == R_MIPS_HI16)
		return 1;	/* skip this */
	inst = TO_NATIVE(*location);
	switch (r_typ) {
	case R_MIPS_LO16:
		r->r_addend = inst & 0xffff;
		break;
	case R_MIPS_26:
		r->r_addend = (inst & 0x03ffffff) << 2;
		break;
	case R_MIPS_32:
		r->r_addend = inst;
		break;
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
103
91.15%
4
80.00%
atsushi nemoto
atsushi nemoto
10
8.85%
1
20.00%
Total
113
100.00%
5
100.00%



static void section_rela(const char *modname, struct elf_info *elf,
			 Elf_Shdr *sechdr)
{
	Elf_Sym  *sym;
	Elf_Rela *rela;
	Elf_Rela r;
	unsigned int r_sym;
	const char *fromsec;

	Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
	Elf_Rela *stop  = (void *)start + sechdr->sh_size;

	fromsec = sech_name(elf, sechdr);
	fromsec += strlen(".rela");
	/* if from section (name) is know good then skip it */
	if (match(fromsec, section_white_list))
		return;

	for (rela = start; rela < stop; rela++) {
		r.r_offset = TO_NATIVE(rela->r_offset);
#if KERNEL_ELFCLASS == ELFCLASS64
		if (elf->hdr->e_machine == EM_MIPS) {
			unsigned int r_typ;
			r_sym = ELF64_MIPS_R_SYM(rela->r_info);
			r_sym = TO_NATIVE(r_sym);
			r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
			r.r_info = ELF64_R_INFO(r_sym, r_typ);
		} else {
			r.r_info = TO_NATIVE(rela->r_info);
			r_sym = ELF_R_SYM(r.r_info);
		}
#else
		r.r_info = TO_NATIVE(rela->r_info);
		r_sym = ELF_R_SYM(r.r_info);
#endif
		r.r_addend = TO_NATIVE(rela->r_addend);
		sym = elf->symtab_start + r_sym;
		/* Skip special sections */
		if (is_shndx_special(sym->st_shndx))
			continue;
		if (is_second_extable_reloc(start, rela, fromsec))
			find_extable_entry_size(fromsec, &r);
		check_section_mismatch(modname, elf, &r, sym, fromsec);
	}
}

Contributors
Person
Tokens
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Commits
CommitProp
atsushi nemoto
atsushi nemoto
185
63.79%
3
25.00%
sam ravnborg
sam ravnborg
80
27.59%
5
41.67%
quentin casasnovas
quentin casasnovas
19
6.55%
2
16.67%
denys vlasenko
denys vlasenko
3
1.03%
1
8.33%
anders kaseorg
anders kaseorg
3
1.03%
1
8.33%
Total
290
100.00%
12
100.00%



static void section_rel(const char *modname, struct elf_info *elf,
			Elf_Shdr *sechdr)
{
	Elf_Sym *sym;
	Elf_Rel *rel;
	Elf_Rela r;
	unsigned int r_sym;
	const char *fromsec;

	Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
	Elf_Rel *stop  = (void *)start + sechdr->sh_size;

	fromsec = sech_name(elf, sechdr);
	fromsec += strlen(".rel");
	/* if from section (name) is know good then skip it */
	if (match(fromsec, section_white_list))
		return;

	for (rel = start; rel < stop; rel++) {
		r.r_offset = TO_NATIVE(rel->r_offset);
#if KERNEL_ELFCLASS == ELFCLASS64
		if (elf->hdr->e_machine == EM_MIPS) {
			unsigned int r_typ;
			r_sym = ELF64_MIPS_R_SYM(rel->r_info);
			r_sym = TO_NATIVE(r_sym);
			r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
			r.r_info = ELF64_R_INFO(r_sym, r_typ);
		} else {
			r.r_info = TO_NATIVE(rel->r_info);
			r_sym = ELF_R_SYM(r.r_info);
		}
#else
		r.r_info = TO_NATIVE(rel->r_info);
		r_sym = ELF_R_SYM(r.r_info);
#endif
		r.r_addend = 0;
		switch (elf->hdr->e_machine) {
		case EM_386:
			if (addend_386_rel(elf, sechdr, &r))
				continue;
			break;
		case EM_ARM:
			if (addend_arm_rel(elf, sechdr, &r))
				continue;
			break;
		case EM_MIPS:
			if (addend_mips_rel(elf, sechdr, &r))
				continue;
			break;
		}
		sym = elf->symtab_start + r_sym;
		/* Skip special sections */
		if (is_shndx_special(sym->st_shndx))
			continue;
		if (is_second_extable_reloc(start, rel, fromsec))
			find_extable_entry_size(fromsec, &r);
		check_section_mismatch(modname, elf, &r, sym, fromsec);
	}
}

Contributors
Person
Tokens
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Commits
CommitProp
sam ravnborg
sam ravnborg
321
92.77%
9
69.23%
quentin casasnovas
quentin casasnovas
19
5.49%
2
15.38%
denys vlasenko
denys vlasenko
3
0.87%
1
7.69%
anders kaseorg
anders kaseorg
3
0.87%
1
7.69%
Total
346
100.00%
13
100.00%

/**
 * A module includes a number of sections that are discarded
 * either when loaded or when used as built-in.
 * For loaded modules all functions marked __init and all data
 * marked __initdata will be discarded when the module has been initialized.
 * Likewise for modules used built-in the sections marked __exit
 * are discarded because __exit marked function are supposed to be called
 * only when a module is unloaded which never happens for built-in modules.
 * The check_sec_ref() function traverses all relocation records
 * to find all references to a section that reference a section that will
 * be discarded and warns about it.
 **/


static void check_sec_ref(struct module *mod, const char *modname,
			  struct elf_info *elf)
{
	int i;
	Elf_Shdr *sechdrs = elf->sechdrs;

	/* Walk through all sections */
	for (i = 0; i < elf->num_sections; i++) {
		check_section(modname, elf, &elf->sechdrs[i]);
		/* We want to process only relocation sections and not .init */
		if (sechdrs[i].sh_type == SHT_RELA)
			section_rela(modname, elf, &elf->sechdrs[i]);
		else if (sechdrs[i].sh_type == SHT_REL)
			section_rel(modname, elf, &elf->sechdrs[i]);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
91
76.47%
4
57.14%
anders kaseorg
anders kaseorg
15
12.61%
1
14.29%
matt domsch
matt domsch
12
10.08%
1
14.29%
denys vlasenko
denys vlasenko
1
0.84%
1
14.29%
Total
119
100.00%
7
100.00%



static char *remove_dot(char *s)
{
	size_t n = strcspn(s, ".");

	if (n && s[n]) {
		size_t m = strspn(s + n + 1, "0123456789");
		if (m && (s[n + m] == '.' || s[n + m] == 0))
			s[n] = 0;
	}
	return s;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andi kleen
andi kleen
61
76.25%
1
50.00%
michal nazarewicz
michal nazarewicz
19
23.75%
1
50.00%
Total
80
100.00%
2
100.00%



static void read_symbols(char *modname)
{
	const char *symname;
	char *version;
	char *license;
	struct module *mod;
	struct elf_info info = { };
	Elf_Sym *sym;

	if (!parse_elf(&info, modname))
		return;

	mod = new_module(modname);

	/* When there's no vmlinux, don't print warnings about
         * unresolved symbols (since there'll be too many ;) */
	if (is_vmlinux(modname)) {
		have_vmlinux = 1;
		mod->skip = 1;
	}

	license = get_modinfo(info.modinfo, info.modinfo_len, "license");
	if (info.modinfo && !license && !is_vmlinux(modname))
		warn("modpost: missing MODULE_LICENSE() in %s\n"
		     "see include/linux/module.h for "
		     "more information\n", modname);
	while (license) {
		if (license_is_gpl_compatible(license))
			mod->gpl_compatible = 1;
		else {
			mod->gpl_compatible = 0;
			break;
		}
		license = get_next_modinfo(info.modinfo, info.modinfo_len,
					   "license", license);
	}

	for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
		symname = remove_dot(info.strtab + sym->st_name);

		handle_modversions(mod, &info, sym, symname);
		handle_moddevtable(mod, &info, sym, symname);
	}
	if (!is_vmlinux(modname) ||
	     (is_vmlinux(modname) && vmlinux_section_warnings))
		check_sec_ref(mod, modname, &info);

	version = get_modinfo(info.modinfo, info.modinfo_len, "version");
	if (version)
		maybe_frob_rcs_version(modname, version, info.modinfo,
				       version - (char *)info.hdr);
	if (version || (all_versions && !is_vmlinux(modname)))
		get_src_version(modname, mod->srcversion,
				sizeof(mod->srcversion)-1);

	parse_elf_finish(&info);

	/* Our trick to get versioning for module struct etc. - it's
         * never passed as an argument to an exported function, so
         * the automatic versioning doesn't pick it up, but it's really
         * important anyhow */
	if (modversions)
		mod->unres = alloc_symbol("module_layout", 0, mod->unres);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
wenji huang
wenji huang
205
59.77%
1
5.88%
sam ravnborg
sam ravnborg
48
13.99%
8
47.06%
kai germaschewski
kai germaschewski
32
9.33%
2
11.76%
mathieu desnoyers
mathieu desnoyers
31
9.04%
1
5.88%
andrew morton
andrew morton
13
3.79%
3
17.65%
matt domsch
matt domsch
11
3.21%
1
5.88%
andi kleen
andi kleen
3
0.87%
1
5.88%
Total
343
100.00%
17
100.00%



static void read_symbols_from_files(const char *filename)
{
	FILE *in = stdin;
	char fname[PATH_MAX];

	if (strcmp(filename, "-") != 0) {
		in = fopen(filename, "r");
		if (!in)
			fatal("Can't open filenames file %s: %m", filename);
	}

	while (fgets(fname, PATH_MAX, in) != NULL) {
		if (strends(fname, "\n"))
			fname[strlen(fname)-1] = '\0';
		read_symbols(fname);
	}

	if (in != stdin)
		fclose(in);
}

Contributors
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Tokens
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rusty russell
rusty russell
109
100.00%
1
100.00%
Total
109
100.00%
1
100.00%


#define SZ 500

/* We first write the generated file into memory using the
 * following helper, then compare to the file on disk and
 * only update the later if anything changed */


void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
						      const char *fmt, ...)
{
	char tmp[SZ];
	int len;
	va_list ap;

	va_start(ap, fmt);
	len = vsnprintf(tmp, SZ, fmt, ap);
	buf_write(buf, tmp, len);
	va_end(ap);
}



void buf_write(struct buffer *buf, const char *s, int len)
{
	if (buf->size - buf->pos < len) {
		buf->size += len + SZ;
		buf->p = realloc(buf->p, buf->size);
	}
	strncpy(buf->p + buf->pos, s, len);
	buf->pos += len;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
kai germaschewski
kai germaschewski
73
96.05%
1
33.33%
sam ravnborg
sam ravnborg
3
3.95%
2
66.67%
Total
76
100.00%
3
100.00%



static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
{
	const char *e = is_vmlinux(m) ?"":".ko";

	switch (exp) {
	case export_gpl:
		fatal("modpost: GPL-incompatible module %s%s "
		      "uses GPL-only symbol '%s'\n", m, e, s);
		break;
	case export_unused_gpl:
		fatal("modpost: GPL-incompatible module %s%s "
		      "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
		break;
	case export_gpl_future:
		warn("modpost: GPL-incompatible module %s%s "
		      "uses future GPL-only symbol '%s'\n", m, e, s);
		break;
	case export_plain:
	case export_unused:
	case export_unknown:
		/* ignore */
		break;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
99
100.00%
2
100.00%
Total
99
100.00%
2
100.00%



static void check_for_unused(enum export exp, const char *m, const char *s)
{
	const char *e = is_vmlinux(m) ?"":".ko";

	switch (exp) {
	case export_unused:
	case export_unused_gpl:
		warn("modpost: module %s%s "
		      "uses symbol '%s' marked UNUSED\n", m, e, s);
		break;
	default:
		/* ignore */
		break;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
62
100.00%
1
100.00%
Total
62
100.00%
1
100.00%



static void check_exports(struct module *mod)
{
	struct symbol *s, *exp;

	for (s = mod->unres; s; s = s->next) {
		const char *basename;
		exp = find_symbol(s->name);
		if (!exp || exp->module == mod)
			continue;
		basename = strrchr(mod->name, '/');
		if (basename)
			basename++;
		else
			basename = mod->name;
		if (!mod->gpl_compatible)
			check_for_gpl_usage(exp->export, basename, exp->name);
		check_for_unused(exp->export, basename, exp->name);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
114
94.21%
2
66.67%
andrew morton
andrew morton
7
5.79%
1
33.33%
Total
121
100.00%
3
100.00%

/**
 * Header for the generated file
 **/


static void add_header(struct buffer *b, struct module *mod)
{
	buf_printf(b, "#include <linux/module.h>\n");
	buf_printf(b, "#include <linux/vermagic.h>\n");
	buf_printf(b, "#include <linux/compiler.h>\n");
	buf_printf(b, "\n");
	buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
	buf_printf(b, "\n");
	buf_printf(b, "__visible struct module __this_module\n");
	buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
	buf_printf(b, "\t.name = KBUILD_MODNAME,\n");
	if (mod->has_init)
		buf_printf(b, "\t.init = init_module,\n");
	if (mod->has_cleanup)
		buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
			      "\t.exit = cleanup_module,\n"
			      "#endif\n");
	buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n");
	buf_printf(b, "};\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andrew morton
andrew morton
47
38.84%
1
11.11%
kai germaschewski
kai germaschewski
43
35.54%
2
22.22%
brian gerst
brian gerst
17
14.05%
1
11.11%
roman zippel
roman zippel
6
4.96%
1
11.11%
greg kroah-hartman
greg kroah-hartman
4
3.31%
1
11.11%
sam ravnborg
sam ravnborg
2
1.65%
1
11.11%
andi kleen
andi kleen
1
0.83%
1
11.11%
rusty russell
rusty russell
1
0.83%
1
11.11%
Total
121
100.00%
9
100.00%



static void add_intree_flag(struct buffer *b, int is_intree)
{
	if (is_intree)
		buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
ben hutchings
ben hutchings
25
100.00%
1
100.00%
Total
25
100.00%
1
100.00%



static void add_staging_flag(struct buffer *b, const char *name)
{
	static const char *staging_dir = "drivers/staging";

	if (strncmp(staging_dir, name, strlen(staging_dir)) == 0)
		buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
greg kroah-hartman
greg kroah-hartman
46
97.87%
1
50.00%
trevor keith
trevor keith
1
2.13%
1
50.00%
Total
47
100.00%
2
100.00%

/* In kernel, this size is defined in linux/module.h;
 * here we use Elf_Addr instead of long for covering cross-compile
 */

#define MODULE_NAME_LEN (64 - sizeof(Elf_Addr))

/**
 * Record CRCs for unresolved symbols
 **/


static int add_versions(struct buffer *b, struct module *mod)
{
	struct symbol *s, *exp;
	int err = 0;

	for (s = mod->unres; s; s = s->next) {
		exp = find_symbol(s->name);
		if (!exp || exp->module == mod) {
			if (have_vmlinux && !s->weak) {
				if (warn_unresolved) {
					warn("\"%s\" [%s.ko] undefined!\n",
					     s->name, mod->name);
				} else {
					merror("\"%s\" [%s.ko] undefined!\n",
					       s->name, mod->name);
					err = 1;
				}
			}
			continue;
		}
		s->module = exp->module;
		s->crc_valid = exp->crc_valid;
		s->crc = exp->crc;
	}

	if (!modversions)
		return err;

	buf_printf(b, "\n");
	buf_printf(b, "static const struct modversion_info ____versions[]\n");
	buf_printf(b, "__used\n");
	buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");

	for (s = mod->unres; s; s = s->next) {
		if (!s->module)
			continue;
		if (!s->crc_valid) {
			warn("\"%s\" [%s.ko] has no CRC!\n",
				s->name, mod->name);
			continue;
		}
		if (strlen(s->name) >= MODULE_NAME_LEN) {
			merror("too long symbol \"%s\" [%s.ko]\n",
			       s->name, mod->name);
			err = 1;
			break;
		}
		buf_printf(b, "\t{ %#8x, __VMLINUX_SYMBOL_STR(%s) },\n",
			   s->crc, s->name);
	}

	buf_printf(b, "};\n");

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
kai germaschewski
kai germaschewski
196
68.77%
3
25.00%
takashi iwai
takashi iwai
31
10.88%
1
8.33%
matthew wilcox
matthew wilcox
22
7.72%
1
8.33%
kirill korotaev
kirill korotaev
18
6.32%
1
8.33%
andrew morton
andrew morton
6
2.11%
1
8.33%
sam ravnborg
sam ravnborg
5
1.75%
2
16.67%
petr vandrovec*
petr vandrovec*
5
1.75%
1
8.33%
james hogan
james hogan
1
0.35%
1
8.33%
adrian bunk
adrian bunk
1
0.35%
1
8.33%
Total
285
100.00%
12
100.00%



static void add_depends(struct buffer *b, struct module *mod,
			struct module *modules)
{
	struct symbol *s;
	struct module *m;
	int first = 1;

	for (m = modules; m; m = m->next)
		m->seen = is_vmlinux(m->name);

	buf_printf(b, "\n");
	buf_printf(b, "static const char __module_depends[]\n");
	buf_printf(b, "__used\n");
	buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
	buf_printf(b, "\"depends=");
	for (s = mod->unres; s; s = s->next) {
		const char *p;
		if (!s->module)
			continue;

		if (s->module->seen)
			continue;

		s->module->seen = 1;
		p = strrchr(s->module->name, '/');
		if (p)
			p++;
		else
			p = s->module->name;
		buf_printf(b, "%s%s", first ? "" : ",", p);
		first = 0;
	}
	buf_printf(b, "\";\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
kai germaschewski
kai germaschewski
157
78.89%
2
28.57%
sam ravnborg
sam ravnborg
37
18.59%
3
42.86%
andrew morton
andrew morton
4
2.01%
1
14.29%
adrian bunk
adrian bunk
1
0.50%
1
14.29%
Total
199
100.00%
7
100.00%



static void add_srcversion(struct buffer *b, struct module *mod)
{
	if (mod->srcversion[0]) {
		buf_printf(b, "\n");
		buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
			   mod->srcversion);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
matt domsch
matt domsch
43
95.56%
1
50.00%
sam ravnborg
sam ravnborg
2
4.44%
1
50.00%
Total
45
100.00%
2
100.00%



static void write_if_changed(struct buffer *b, const char *fname)
{
	char *tmp;
	FILE *file;
	struct stat st;

	file = fopen(fname, "r");
	if (!file)
		goto write;

	if (fstat(fileno(file), &st) < 0)
		goto close_write;

	if (st.st_size != b->pos)
		goto close_write;

	tmp = NOFAIL(malloc(b->pos));
	if (fread(tmp, 1, b->pos, file) != b->pos)
		goto free_write;

	if (memcmp(tmp, b->p, b->pos) != 0)
		goto free_write;

	free(tmp);
	fclose(file);
	return;

 free_write:
	free(tmp);
 close_write:
	fclose(file);
 write:
	file = fopen(fname, "w");
	if (!file) {
		perror(fname);
		exit(1);
	}
	if (fwrite(b->p, 1, b->pos, file) != b->pos) {
		perror(fname);
		exit(1);
	}
	fclose(file);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
kai germaschewski
kai germaschewski
167
75.57%
1
25.00%
wenji huang
wenji huang
46
20.81%
1
25.00%
mathieu desnoyers
mathieu desnoyers
6
2.71%
1
25.00%
sam ravnborg
sam ravnborg
2
0.90%
1
25.00%
Total
221
100.00%
4
100.00%

/* parse Module.symvers file. line format:
 * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
 **/


static void read_dump(const char *fname, unsigned int kernel)
{
	unsigned long size, pos = 0;
	void *file = grab_file(fname, &size);
	char *line;

	if (!file)
		/* No symbol versions, silently ignore */
		return;

	while ((line = get_next_line(&pos, file, size))) {
		char *symname, *modname, *d, *export, *end;
		unsigned int crc;
		struct module *mod;
		struct symbol *s;

		if (!(symname = strchr(line, '\t')))
			goto fail;
		*symname++ = '\0';
		if (!(modname = strchr(symname, '\t')))
			goto fail;
		*modname++ = '\0';
		if ((export = strchr(modname, '\t')) != NULL)
			*export++ = '\0';
		if (export && ((end = strchr(export, '\t')) != NULL))
			*end = '\0';
		crc = strtoul(line, &d, 16);
		if (*symname == '\0' || *modname == '\0' || *d != '\0')
			goto fail;
		mod = find_module(modname);
		if (!mod) {
			if (is_vmlinux(modname))
				have_vmlinux = 1;
			mod = new_module(modname);
			mod->skip = 1;
		}
		s = sym_add_exported(symname, mod, export_no(export));
		s->kernel    = kernel;
		s->preloaded = 1;
		sym_update_crc(symname, mod, crc, export_no(export));
	}
	release_file(file, size);
	return;
fail:
	release_file(file, size);
	fatal("parse error in symbol dump file\n");
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andrew morton
andrew morton
141
44.48%
2
18.18%
wenji huang
wenji huang
135
42.59%
1
9.09%
christian engelmayer
christian engelmayer
14
4.42%
1
9.09%
sam ravnborg
sam ravnborg
14
4.42%
3
27.27%
mathieu desnoyers
mathieu desnoyers
7
2.21%
2
18.18%
cedric hombourger
cedric hombourger
3
0.95%
1
9.09%
ram pai
ram pai
3
0.95%
1
9.09%
Total
317
100.00%
11
100.00%

/* For normal builds always dump all symbols.
 * For external modules only dump symbols
 * that are not read from kernel Module.symvers.
 **/


static int dump_sym(struct symbol *sym)
{
	if (!external_module)
		return 1;
	if (sym->vmlinux || sym->kernel)
		return 0;
	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
wenji huang
wenji huang
26
74.29%
1
33.33%
sam ravnborg
sam ravnborg
8
22.86%
1
33.33%
mathieu desnoyers
mathieu desnoyers
1
2.86%
1
33.33%
Total
35
100.00%
3
100.00%



static void write_dump(const char *fname)
{
	struct buffer buf = { };
	struct symbol *symbol;
	int n;

	for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
		symbol = symbolhash[n];
		while (symbol) {
			if (dump_sym(symbol))
				buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
					symbol->crc, symbol->name,
					symbol->module->name,
					export_str(symbol->export));
			symbol = symbol->next;
		}
	}
	write_if_changed(&buf, fname);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andrew morton
andrew morton
52
50.49%
1
20.00%
wenji huang
wenji huang
45
43.69%
1
20.00%
ram pai
ram pai
3
2.91%
1
20.00%
sam ravnborg
sam ravnborg
2
1.94%
1
20.00%
mathieu desnoyers
mathieu desnoyers
1
0.97%
1
20.00%
Total
103
100.00%
5
100.00%


struct ext_sym_list {
	
struct ext_sym_list *next;
	
const char *file;
};



int main(int argc, char **argv)
{
	struct module *mod;
	struct buffer buf = { };
	char *kernel_read = NULL, *module_read = NULL;
	char *dump_write = NULL, *files_source = NULL;
	int opt;
	int err;
	struct ext_sym_list *extsym_iter;
	struct ext_sym_list *extsym_start = NULL;

	while ((opt = getopt(argc, argv, "i:I:e:mnsST:o:awM:K:E")) != -1) {
		switch (opt) {
		case 'i':
			kernel_read = optarg;
			break;
		case 'I':
			module_read = optarg;
			external_module = 1;
			break;
		case 'e':
			external_module = 1;
			extsym_iter =
			   NOFAIL(malloc(sizeof(*extsym_iter)));
			extsym_iter->next = extsym_start;
			extsym_iter->file = optarg;
			extsym_start = extsym_iter;
			break;
		case 'm':
			modversions = 1;
			break;
		case 'n':
			ignore_missing_files = 1;
			break;
		case 'o':
			dump_write = optarg;
			break;
		case 'a':
			all_versions = 1;
			break;
		case 's':
			vmlinux_section_warnings = 0;
			break;
		case 'S':
			sec_mismatch_verbose = 0;
			break;
		case 'T':
			files_source = optarg;
			break;
		case 'w':
			warn_unresolved = 1;
			break;
		case 'E':
			sec_mismatch_fatal = 1;
			break;
		default:
			exit(1);
		}
	}

	if (kernel_read)
		read_dump(kernel_read, 1);
	if (module_read)
		read_dump(module_read, 0);
	while (extsym_start) {
		read_dump(extsym_start->file, 0);
		extsym_iter = extsym_start->next;
		free(extsym_start);
		extsym_start = extsym_iter;
	}

	while (optind < argc)
		read_symbols(argv[optind++]);

	if (files_source)
		read_symbols_from_files(files_source);

	for (mod = modules; mod; mod = mod->next) {
		if (mod->skip)
			continue;
		check_exports(mod);
	}

	err = 0;

	for (mod = modules; mod; mod = mod->next) {
		char fname[PATH_MAX];

		if (mod->skip)
			continue;

		buf.pos = 0;

		add_header(&buf, mod);
		add_intree_flag(&buf, !external_module);
		add_staging_flag(&buf, mod->name);
		err |= add_versions(&buf, mod);
		add_depends(&buf, mod, modules);
		add_moddevtable(&buf, mod);
		add_srcversion(&buf, mod);

		sprintf(fname, "%s.mod.c", mod->name);
		write_if_changed(&buf, fname);
	}
	if (dump_write)
		write_dump(dump_write);
	if (sec_mismatch_count) {
		if (!sec_mismatch_verbose) {
			warn("modpost: Found %d section mismatch(es).\n"
			     "To see full details build your kernel with:\n"
			     "'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n",
			     sec_mismatch_count);
		}
		if (sec_mismatch_fatal) {
			fatal("modpost: Section mismatches detected.\n"
			      "Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them.\n");
		}
	}

	return err;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
kai germaschewski
kai germaschewski
114
22.94%
4
16.00%
sam ravnborg
sam ravnborg
94
18.91%
8
32.00%
andrew morton
andrew morton
89
17.91%
1
4.00%
richard hacker
richard hacker
80
16.10%
1
4.00%
nicolas boichat
nicolas boichat
28
5.63%
1
4.00%
rusty russell
rusty russell
22
4.43%
1
4.00%
kirill korotaev
kirill korotaev
18
3.62%
1
4.00%
matt domsch
matt domsch
16
3.22%
1
4.00%
greg kroah-hartman
greg kroah-hartman
10
2.01%
1
4.00%
ben hutchings
ben hutchings
9
1.81%
1
4.00%
guenter roeck
guenter roeck
8
1.61%
1
4.00%
andi kleen
andi kleen
5
1.01%
1
4.00%
brian gerst
brian gerst
2
0.40%
1
4.00%
mathias krause
mathias krause
1
0.20%
1
4.00%
geert uytterhoeven
geert uytterhoeven
1
0.20%
1
4.00%
Total
497
100.00%
25
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
sam ravnborg
sam ravnborg
3924
33.19%
49
26.49%
kai germaschewski
kai germaschewski
2033
17.20%
8
4.32%
quentin casasnovas
quentin casasnovas
1016
8.59%
10
5.41%
andrew morton
andrew morton
745
6.30%
14
7.57%
wenji huang
wenji huang
459
3.88%
1
0.54%
ram pai
ram pai
330
2.79%
1
0.54%
atsushi nemoto
atsushi nemoto
303
2.56%
3
1.62%
denys vlasenko
denys vlasenko
294
2.49%
1
0.54%
rusty russell
rusty russell
281
2.38%
6
3.24%
matt domsch
matt domsch
249
2.11%
1
0.54%
anders kaseorg
anders kaseorg
208
1.76%
3
1.62%
uwe kleine-koenig
uwe kleine-koenig
199
1.68%
6
3.24%
alexey fomenko
alexey fomenko
167
1.41%
1
0.54%
alessio igor bogani
alessio igor bogani
160
1.35%
1
0.54%
andi kleen
andi kleen
132
1.12%
8
4.32%
paul gortmaker
paul gortmaker
123
1.04%
3
1.62%
richard hacker
richard hacker
95
0.80%
1
0.54%
randy dunlap
randy dunlap
71
0.60%
1
0.54%
matthew wilcox
matthew wilcox
65
0.55%
1
0.54%
andreas schwab
andreas schwab
64
0.54%
1
0.54%
greg kroah-hartman
greg kroah-hartman
60
0.51%
2
1.08%
mathieu desnoyers
mathieu desnoyers
56
0.47%
3
1.62%
brian gerst
brian gerst
51
0.43%
1
0.54%
stephen rothwell
stephen rothwell
50
0.42%
2
1.08%
al viro
al viro
44
0.37%
1
0.54%
kirill korotaev
kirill korotaev
43
0.36%
1
0.54%
petr vandrovec*
petr vandrovec*
41
0.35%
1
0.54%
guenter roeck
guenter roeck
39
0.33%
1
0.54%
takashi iwai
takashi iwai
36
0.30%
1
0.54%
david a. long
david a. long
36
0.30%
1
0.54%
sebastian andrzej siewior
sebastian andrzej siewior
35
0.30%
1
0.54%
ben hutchings
ben hutchings
34
0.29%
1
0.54%
nicolas boichat
nicolas boichat
34
0.29%
1
0.54%
david s. miller
david s. miller
32
0.27%
1
0.54%
petr stetiar
petr stetiar
30
0.25%
1
0.54%
tejun heo
tejun heo
26
0.22%
1
0.54%
tony lindgren
tony lindgren
24
0.20%
1
0.54%
ben collins
ben collins
22
0.19%
1
0.54%
david brownell
david brownell
22
0.19%
1
0.54%
michal nazarewicz
michal nazarewicz
19
0.16%
1
0.54%
christian engelmayer
christian engelmayer
14
0.12%
1
0.54%
frank rowand
frank rowand
14
0.12%
1
0.54%
vivek goyal
vivek goyal
13
0.11%
2
1.08%
jesper juhl
jesper juhl
13
0.11%
1
0.54%
mathias krause
mathias krause
12
0.10%
2
1.08%
alan modra
alan modra
9
0.08%
1
0.54%
trent piepho
trent piepho
9
0.08%
1
0.54%
jan beulich
jan beulich
7
0.06%
2
1.08%
vineet gupta
vineet gupta
6
0.05%
1
0.54%
max filippov
max filippov
6
0.05%
1
0.54%
noam camus
noam camus
6
0.05%
1
0.54%
roman zippel
roman zippel
6
0.05%
1
0.54%
rasmus villemoes
rasmus villemoes
6
0.05%
1
0.54%
geert uytterhoeven
geert uytterhoeven
6
0.05%
2
1.08%
arnd bergmann
arnd bergmann
4
0.03%
1
0.54%
david howells
david howells
3
0.03%
1
0.54%
chen gang
chen gang
3
0.03%
1
0.54%
cedric hombourger
cedric hombourger
3
0.03%
1
0.54%
jonathan kliegman
jonathan kliegman
3
0.03%
1
0.54%
alan cox
alan cox
3
0.03%
1
0.54%
h.j. lu
h.j. lu
3
0.03%
1
0.54%
magnus damm
magnus damm
2
0.02%
1
0.54%
russell king
russell king
2
0.02%
1
0.54%
michal marek
michal marek
2
0.02%
1
0.54%
trevor keith
trevor keith
2
0.02%
1
0.54%
alan jenkins
alan jenkins
2
0.02%
1
0.54%
tom rini
tom rini
2
0.02%
2
1.08%
adrian bunk
adrian bunk
2
0.02%
1
0.54%
keith m. wesolowski
keith m. wesolowski
1
0.01%
1
0.54%
james hogan
james hogan
1
0.01%
1
0.54%
chris metcalf
chris metcalf
1
0.01%
1
0.54%
andreas gruenbacher
andreas gruenbacher
1
0.01%
1
0.54%
kyle mcmartin
kyle mcmartin
1
0.01%
1
0.54%
paul bolle
paul bolle
1
0.01%
1
0.54%
pavel emelianov
pavel emelianov
1
0.01%
1
0.54%
linus torvalds
linus torvalds
1
0.01%
1
0.54%
Total
11823
100.00%
185
100.00%
  
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