cregit-Linux how code gets into the kernel

Release 4.15 scripts/mod/sumversion.c

Directory: scripts/mod
#include <netinet/in.h>
#ifdef __sun__
#include <inttypes.h>
#else
#include <stdint.h>
#endif
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <limits.h>
#include "modpost.h"

/*
 * Stolen form Cryptographic API.
 *
 * MD4 Message Digest Algorithm (RFC1320).
 *
 * Implementation derived from Andrew Tridgell and Steve French's
 * CIFS MD4 implementation, and the cryptoapi implementation
 * originally based on the public domain implementation written
 * by Colin Plumb in 1993.
 *
 * Copyright (c) Andrew Tridgell 1997-1998.
 * Modified by Steve French (sfrench@us.ibm.com) 2002
 * Copyright (c) Cryptoapi developers.
 * Copyright (c) 2002 David S. Miller (davem@redhat.com)
 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 */

#define MD4_DIGEST_SIZE		16

#define MD4_HMAC_BLOCK_SIZE	64

#define MD4_BLOCK_WORDS		16

#define MD4_HASH_WORDS		4


struct md4_ctx {
	
uint32_t hash[MD4_HASH_WORDS];
	
uint32_t block[MD4_BLOCK_WORDS];
	
uint64_t byte_count;
};


static inline uint32_t lshift(uint32_t x, unsigned int s) { x &= 0xFFFFFFFF; return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s)); }

Contributors

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Andrew Morton39100.00%1100.00%
Total39100.00%1100.00%


static inline uint32_t F(uint32_t x, uint32_t y, uint32_t z) { return (x & y) | ((~x) & z); }

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Andrew Morton32100.00%1100.00%
Total32100.00%1100.00%


static inline uint32_t G(uint32_t x, uint32_t y, uint32_t z) { return (x & y) | (x & z) | (y & z); }

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Andrew Morton35100.00%1100.00%
Total35100.00%1100.00%


static inline uint32_t H(uint32_t x, uint32_t y, uint32_t z) { return x ^ y ^ z; }

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PersonTokensPropCommitsCommitProp
Andrew Morton23100.00%1100.00%
Total23100.00%1100.00%

#define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s)) #define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (uint32_t)0x5A827999,s)) #define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (uint32_t)0x6ED9EBA1,s)) /* XXX: this stuff can be optimized */
static inline void le32_to_cpu_array(uint32_t *buf, unsigned int words) { while (words--) { *buf = ntohl(*buf); buf++; } }

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Andrew Morton34100.00%1100.00%
Total34100.00%1100.00%


static inline void cpu_to_le32_array(uint32_t *buf, unsigned int words) { while (words--) { *buf = htonl(*buf); buf++; } }

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Andrew Morton34100.00%1100.00%
Total34100.00%1100.00%


static void md4_transform(uint32_t *hash, uint32_t const *in) { uint32_t a, b, c, d; a = hash[0]; b = hash[1]; c = hash[2]; d = hash[3]; ROUND1(a, b, c, d, in[0], 3); ROUND1(d, a, b, c, in[1], 7); ROUND1(c, d, a, b, in[2], 11); ROUND1(b, c, d, a, in[3], 19); ROUND1(a, b, c, d, in[4], 3); ROUND1(d, a, b, c, in[5], 7); ROUND1(c, d, a, b, in[6], 11); ROUND1(b, c, d, a, in[7], 19); ROUND1(a, b, c, d, in[8], 3); ROUND1(d, a, b, c, in[9], 7); ROUND1(c, d, a, b, in[10], 11); ROUND1(b, c, d, a, in[11], 19); ROUND1(a, b, c, d, in[12], 3); ROUND1(d, a, b, c, in[13], 7); ROUND1(c, d, a, b, in[14], 11); ROUND1(b, c, d, a, in[15], 19); ROUND2(a, b, c, d,in[ 0], 3); ROUND2(d, a, b, c, in[4], 5); ROUND2(c, d, a, b, in[8], 9); ROUND2(b, c, d, a, in[12], 13); ROUND2(a, b, c, d, in[1], 3); ROUND2(d, a, b, c, in[5], 5); ROUND2(c, d, a, b, in[9], 9); ROUND2(b, c, d, a, in[13], 13); ROUND2(a, b, c, d, in[2], 3); ROUND2(d, a, b, c, in[6], 5); ROUND2(c, d, a, b, in[10], 9); ROUND2(b, c, d, a, in[14], 13); ROUND2(a, b, c, d, in[3], 3); ROUND2(d, a, b, c, in[7], 5); ROUND2(c, d, a, b, in[11], 9); ROUND2(b, c, d, a, in[15], 13); ROUND3(a, b, c, d,in[ 0], 3); ROUND3(d, a, b, c, in[8], 9); ROUND3(c, d, a, b, in[4], 11); ROUND3(b, c, d, a, in[12], 15); ROUND3(a, b, c, d, in[2], 3); ROUND3(d, a, b, c, in[10], 9); ROUND3(c, d, a, b, in[6], 11); ROUND3(b, c, d, a, in[14], 15); ROUND3(a, b, c, d, in[1], 3); ROUND3(d, a, b, c, in[9], 9); ROUND3(c, d, a, b, in[5], 11); ROUND3(b, c, d, a, in[13], 15); ROUND3(a, b, c, d, in[3], 3); ROUND3(d, a, b, c, in[11], 9); ROUND3(c, d, a, b, in[7], 11); ROUND3(b, c, d, a, in[15], 15); hash[0] += a; hash[1] += b; hash[2] += c; hash[3] += d; }

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PersonTokensPropCommitsCommitProp
Andrew Morton944100.00%1100.00%
Total944100.00%1100.00%


static inline void md4_transform_helper(struct md4_ctx *ctx) { le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(uint32_t)); md4_transform(ctx->hash, ctx->block); }

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Andrew Morton42100.00%1100.00%
Total42100.00%1100.00%


static void md4_init(struct md4_ctx *mctx) { mctx->hash[0] = 0x67452301; mctx->hash[1] = 0xefcdab89; mctx->hash[2] = 0x98badcfe; mctx->hash[3] = 0x10325476; mctx->byte_count = 0; }

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PersonTokensPropCommitsCommitProp
Andrew Morton53100.00%1100.00%
Total53100.00%1100.00%


static void md4_update(struct md4_ctx *mctx, const unsigned char *data, unsigned int len) { const uint32_t avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f); mctx->byte_count += len; if (avail > len) { memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), data, len); return; } memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), data, avail); md4_transform_helper(mctx); data += avail; len -= avail; while (len >= sizeof(mctx->block)) { memcpy(mctx->block, data, sizeof(mctx->block)); md4_transform_helper(mctx); data += sizeof(mctx->block); len -= sizeof(mctx->block); } memcpy(mctx->block, data, len); }

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PersonTokensPropCommitsCommitProp
Andrew Morton183100.00%1100.00%
Total183100.00%1100.00%


static void md4_final_ascii(struct md4_ctx *mctx, char *out, unsigned int len) { const unsigned int offset = mctx->byte_count & 0x3f; char *p = (char *)mctx->block + offset; int padding = 56 - (offset + 1); *p++ = 0x80; if (padding < 0) { memset(p, 0x00, padding + sizeof (uint64_t)); md4_transform_helper(mctx); p = (char *)mctx->block; padding = 56; } memset(p, 0, padding); mctx->block[14] = mctx->byte_count << 3; mctx->block[15] = mctx->byte_count >> 29; le32_to_cpu_array(mctx->block, (sizeof(mctx->block) - sizeof(uint64_t)) / sizeof(uint32_t)); md4_transform(mctx->hash, mctx->block); cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(uint32_t)); snprintf(out, len, "%08X%08X%08X%08X", mctx->hash[0], mctx->hash[1], mctx->hash[2], mctx->hash[3]); }

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PersonTokensPropCommitsCommitProp
Andrew Morton230100.00%1100.00%
Total230100.00%1100.00%


static inline void add_char(unsigned char c, struct md4_ctx *md) { md4_update(md, &c, 1); }

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PersonTokensPropCommitsCommitProp
Andrew Morton26100.00%1100.00%
Total26100.00%1100.00%


static int parse_string(const char *file, unsigned long len, struct md4_ctx *md) { unsigned long i; add_char(file[0], md); for (i = 1; i < len; i++) { add_char(file[i], md); if (file[i] == '"' && file[i-1] != '\\') break; } return i; }

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PersonTokensPropCommitsCommitProp
Andrew Morton81100.00%1100.00%
Total81100.00%1100.00%


static int parse_comment(const char *file, unsigned long len) { unsigned long i; for (i = 2; i < len; i++) { if (file[i-1] == '*' && file[i] == '/') break; } return i; }

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PersonTokensPropCommitsCommitProp
Andrew Morton56100.00%1100.00%
Total56100.00%1100.00%

/* FIXME: Handle .s files differently (eg. # starts comments) --RR */
static int parse_file(const char *fname, struct md4_ctx *md) { char *file; unsigned long i, len; file = grab_file(fname, &len); if (!file) return 0; for (i = 0; i < len; i++) { /* Collapse and ignore \ and CR. */ if (file[i] == '\\' && (i+1 < len) && file[i+1] == '\n') { i++; continue; } /* Ignore whitespace */ if (isspace(file[i])) continue; /* Handle strings as whole units */ if (file[i] == '"') { i += parse_string(file+i, len - i, md); continue; } /* Comments: ignore */ if (file[i] == '/' && file[i+1] == '*') { i += parse_comment(file+i, len - i); continue; } add_char(file[i], md); } release_file(file, len); return 1; }

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PersonTokensPropCommitsCommitProp
Andrew Morton187100.00%1100.00%
Total187100.00%1100.00%

/* Check whether the file is a static library or not */
static int is_static_library(const char *objfile) { int len = strlen(objfile); if (objfile[len - 2] == '.' && objfile[len - 1] == 'a') return 1; else return 0; }

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PersonTokensPropCommitsCommitProp
Ashutosh Naik46100.00%1100.00%
Total46100.00%1100.00%

/* We have dir/file.o. Open dir/.file.o.cmd, look for source_ and deps_ line * to figure out source files. */
static int parse_source_files(const char *objfile, struct md4_ctx *md) { char *cmd, *file, *line, *dir; const char *base; unsigned long flen, pos = 0; int dirlen, ret = 0, check_files = 0; cmd = NOFAIL(malloc(strlen(objfile) + sizeof("..cmd"))); base = strrchr(objfile, '/'); if (base) { base++; dirlen = base - objfile; sprintf(cmd, "%.*s.%s.cmd", dirlen, objfile, base); } else { dirlen = 0; sprintf(cmd, ".%s.cmd", objfile); } dir = NOFAIL(malloc(dirlen + 1)); strncpy(dir, objfile, dirlen); dir[dirlen] = '\0'; file = grab_file(cmd, &flen); if (!file) { warn("could not find %s for %s\n", cmd, objfile); goto out; } /* There will be a line like so: deps_drivers/net/dummy.o := \ drivers/net/dummy.c \ $(wildcard include/config/net/fastroute.h) \ include/linux/module.h \ Sum all files in the same dir or subdirs. */ while ((line = get_next_line(&pos, file, flen)) != NULL) { char* p = line; if (strncmp(line, "source_", sizeof("source_")-1) == 0) { p = strrchr(line, ' '); if (!p) { warn("malformed line: %s\n", line); goto out_file; } p++; if (!parse_file(p, md)) { warn("could not open %s: %s\n", p, strerror(errno)); goto out_file; } continue; } if (strncmp(line, "deps_", sizeof("deps_")-1) == 0) { check_files = 1; continue; } if (!check_files) continue; /* Continue until line does not end with '\' */ if ( *(p + strlen(p)-1) != '\\') break; /* Terminate line at first space, to get rid of final ' \' */ while (*p) { if (isspace(*p)) { *p = '\0'; break; } p++; } /* Check if this file is in same dir as objfile */ if ((strstr(line, dir)+strlen(dir)-1) == strrchr(line, '/')) { if (!parse_file(line, md)) { warn("could not open %s: %s\n", line, strerror(errno)); goto out_file; } } } /* Everyone parsed OK */ ret = 1; out_file: release_file(file, flen); out: free(dir); free(cmd); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton36381.57%350.00%
Michal Marek7717.30%116.67%
Sam Ravnborg40.90%116.67%
Markus Heidelberg10.22%116.67%
Total445100.00%6100.00%

/* Calc and record src checksum. */
void get_src_version(const char *modname, char sum[], unsigned sumlen) { void *file; unsigned long len; struct md4_ctx md; char *sources, *end, *fname; const char *basename; char filelist[PATH_MAX + 1]; char *modverdir = getenv("MODVERDIR"); if (!modverdir) modverdir = "."; /* Source files for module are in .tmp_versions/modname.mod, after the first line. */ if (strrchr(modname, '/')) basename = strrchr(modname, '/') + 1; else basename = modname; snprintf(filelist, sizeof(filelist), "%s/%.*s.mod", modverdir, (int) strlen(basename) - 2, basename); file = grab_file(filelist, &len); if (!file) /* not a module or .mod file missing - ignore */ return; sources = strchr(file, '\n'); if (!sources) { warn("malformed versions file for %s\n", modname); goto release; } sources++; end = strchr(sources, '\n'); if (!end) { warn("bad ending versions file for %s\n", modname); goto release; } *end = '\0'; md4_init(&md); while ((fname = strsep(&sources, " ")) != NULL) { if (!*fname) continue; if (!(is_static_library(fname)) && !parse_source_files(fname, &md)) goto release; } md4_final_ascii(&md, sum, sumlen); release: release_file(file, len); }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton20174.17%111.11%
Sam Ravnborg248.86%333.33%
Domen Puncer155.54%111.11%
Andreas Gruenbacher103.69%111.11%
Ashutosh Naik82.95%111.11%
Matt Domsch72.58%111.11%
Kees Cook62.21%111.11%
Total271100.00%9100.00%


static void write_version(const char *filename, const char *sum, unsigned long offset) { int fd