Contributors: 32
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Aaron Tomlin |
733 |
41.86% |
15 |
17.86% |
| Luis R. Rodriguez |
227 |
12.96% |
6 |
7.14% |
| Rusty Russell |
190 |
10.85% |
14 |
16.67% |
| Dmitry Torokhov |
151 |
8.62% |
1 |
1.19% |
| Peter Zijlstra |
68 |
3.88% |
4 |
4.76% |
| Jessica Yu |
59 |
3.37% |
3 |
3.57% |
| Matthias Maennich |
54 |
3.08% |
1 |
1.19% |
| Kai Germaschewski |
38 |
2.17% |
2 |
2.38% |
| Christophe Leroy |
31 |
1.77% |
8 |
9.52% |
| John Levon |
30 |
1.71% |
1 |
1.19% |
| Kees Cook |
30 |
1.71% |
2 |
2.38% |
| Song Liu |
25 |
1.43% |
1 |
1.19% |
| Masahiro Yamada |
17 |
0.97% |
2 |
2.38% |
| Ard Biesheuvel |
11 |
0.63% |
2 |
2.38% |
| Linus Torvalds (pre-git) |
11 |
0.63% |
4 |
4.76% |
| Oleg Nesterov |
10 |
0.57% |
1 |
1.19% |
| Alessio Igor Bogani |
10 |
0.57% |
1 |
1.19% |
| Linus Torvalds |
8 |
0.46% |
1 |
1.19% |
| Randy Dunlap |
6 |
0.34% |
1 |
1.19% |
| Sergey Senozhatsky |
6 |
0.34% |
1 |
1.19% |
| Christoph Hellwig |
5 |
0.29% |
1 |
1.19% |
| Petr Mladek |
5 |
0.29% |
1 |
1.19% |
| Greg Kroah-Hartman |
4 |
0.23% |
1 |
1.19% |
| Eugene Loh |
4 |
0.23% |
1 |
1.19% |
| Arjan van de Ven |
4 |
0.23% |
2 |
2.38% |
| Mathias Krause |
3 |
0.17% |
1 |
1.19% |
| Andi Kleen |
3 |
0.17% |
1 |
1.19% |
| Mimi Zohar |
3 |
0.17% |
1 |
1.19% |
| Alexey Dobriyan |
2 |
0.11% |
1 |
1.19% |
| Tim Abbott |
1 |
0.06% |
1 |
1.19% |
| Thomas Gleixner |
1 |
0.06% |
1 |
1.19% |
| Steven Rostedt |
1 |
0.06% |
1 |
1.19% |
| Total |
1751 |
|
84 |
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Module internals
*
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
* Copyright (C) 2023 Luis Chamberlain <mcgrof@kernel.org>
*/
#include <linux/elf.h>
#include <linux/compiler.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/mm.h>
#ifndef ARCH_SHF_SMALL
#define ARCH_SHF_SMALL 0
#endif
/*
* Use highest 4 bits of sh_entsize to store the mod_mem_type of this
* section. This leaves 28 bits for offset on 32-bit systems, which is
* about 256 MiB (WARN_ON_ONCE if we exceed that).
*/
#define SH_ENTSIZE_TYPE_BITS 4
#define SH_ENTSIZE_TYPE_SHIFT (BITS_PER_LONG - SH_ENTSIZE_TYPE_BITS)
#define SH_ENTSIZE_TYPE_MASK ((1UL << SH_ENTSIZE_TYPE_BITS) - 1)
#define SH_ENTSIZE_OFFSET_MASK ((1UL << (BITS_PER_LONG - SH_ENTSIZE_TYPE_BITS)) - 1)
/* Maximum number of characters written by module_flags() */
#define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4)
struct kernel_symbol {
#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
int value_offset;
int name_offset;
int namespace_offset;
#else
unsigned long value;
const char *name;
const char *namespace;
#endif
};
extern struct mutex module_mutex;
extern struct list_head modules;
extern struct module_attribute *modinfo_attrs[];
extern size_t modinfo_attrs_count;
/* Provided by the linker */
extern const struct kernel_symbol __start___ksymtab[];
extern const struct kernel_symbol __stop___ksymtab[];
extern const struct kernel_symbol __start___ksymtab_gpl[];
extern const struct kernel_symbol __stop___ksymtab_gpl[];
extern const s32 __start___kcrctab[];
extern const s32 __start___kcrctab_gpl[];
struct load_info {
const char *name;
/* pointer to module in temporary copy, freed at end of load_module() */
struct module *mod;
Elf_Ehdr *hdr;
unsigned long len;
Elf_Shdr *sechdrs;
char *secstrings, *strtab;
unsigned long symoffs, stroffs, init_typeoffs, core_typeoffs;
bool sig_ok;
#ifdef CONFIG_KALLSYMS
unsigned long mod_kallsyms_init_off;
#endif
#ifdef CONFIG_MODULE_DECOMPRESS
#ifdef CONFIG_MODULE_STATS
unsigned long compressed_len;
#endif
struct page **pages;
unsigned int max_pages;
unsigned int used_pages;
#endif
struct {
unsigned int sym, str, mod, vers, info, pcpu;
} index;
};
enum mod_license {
NOT_GPL_ONLY,
GPL_ONLY,
};
struct find_symbol_arg {
/* Input */
const char *name;
bool gplok;
bool warn;
/* Output */
struct module *owner;
const s32 *crc;
const struct kernel_symbol *sym;
enum mod_license license;
};
int mod_verify_sig(const void *mod, struct load_info *info);
int try_to_force_load(struct module *mod, const char *reason);
bool find_symbol(struct find_symbol_arg *fsa);
struct module *find_module_all(const char *name, size_t len, bool even_unformed);
int cmp_name(const void *name, const void *sym);
long module_get_offset_and_type(struct module *mod, enum mod_mem_type type,
Elf_Shdr *sechdr, unsigned int section);
char *module_flags(struct module *mod, char *buf, bool show_state);
size_t module_flags_taint(unsigned long taints, char *buf);
char *module_next_tag_pair(char *string, unsigned long *secsize);
#define for_each_modinfo_entry(entry, info, name) \
for (entry = get_modinfo(info, name); entry; entry = get_next_modinfo(info, name, entry))
static inline void module_assert_mutex_or_preempt(void)
{
#ifdef CONFIG_LOCKDEP
if (unlikely(!debug_locks))
return;
WARN_ON_ONCE(!rcu_read_lock_sched_held() &&
!lockdep_is_held(&module_mutex));
#endif
}
static inline unsigned long kernel_symbol_value(const struct kernel_symbol *sym)
{
#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
return (unsigned long)offset_to_ptr(&sym->value_offset);
#else
return sym->value;
#endif
}
#ifdef CONFIG_LIVEPATCH
int copy_module_elf(struct module *mod, struct load_info *info);
void free_module_elf(struct module *mod);
#else /* !CONFIG_LIVEPATCH */
static inline int copy_module_elf(struct module *mod, struct load_info *info)
{
return 0;
}
static inline void free_module_elf(struct module *mod) { }
#endif /* CONFIG_LIVEPATCH */
static inline bool set_livepatch_module(struct module *mod)
{
#ifdef CONFIG_LIVEPATCH
mod->klp = true;
return true;
#else
return false;
#endif
}
/**
* enum fail_dup_mod_reason - state at which a duplicate module was detected
*
* @FAIL_DUP_MOD_BECOMING: the module is read properly, passes all checks but
* we've determined that another module with the same name is already loaded
* or being processed on our &modules list. This happens on early_mod_check()
* right before layout_and_allocate(). The kernel would have already
* vmalloc()'d space for the entire module through finit_module(). If
* decompression was used two vmap() spaces were used. These failures can
* happen when userspace has not seen the module present on the kernel and
* tries to load the module multiple times at same time.
* @FAIL_DUP_MOD_LOAD: the module has been read properly, passes all validation
* checks and the kernel determines that the module was unique and because
* of this allocated yet another private kernel copy of the module space in
* layout_and_allocate() but after this determined in add_unformed_module()
* that another module with the same name is already loaded or being processed.
* These failures should be mitigated as much as possible and are indicative
* of really fast races in loading modules. Without module decompression
* they waste twice as much vmap space. With module decompression three
* times the module's size vmap space is wasted.
*/
enum fail_dup_mod_reason {
FAIL_DUP_MOD_BECOMING = 0,
FAIL_DUP_MOD_LOAD,
};
#ifdef CONFIG_MODULE_DEBUGFS
extern struct dentry *mod_debugfs_root;
#endif
#ifdef CONFIG_MODULE_STATS
#define mod_stat_add_long(count, var) atomic_long_add(count, var)
#define mod_stat_inc(name) atomic_inc(name)
extern atomic_long_t total_mod_size;
extern atomic_long_t total_text_size;
extern atomic_long_t invalid_kread_bytes;
extern atomic_long_t invalid_decompress_bytes;
extern atomic_t modcount;
extern atomic_t failed_kreads;
extern atomic_t failed_decompress;
struct mod_fail_load {
struct list_head list;
char name[MODULE_NAME_LEN];
atomic_long_t count;
unsigned long dup_fail_mask;
};
int try_add_failed_module(const char *name, enum fail_dup_mod_reason reason);
void mod_stat_bump_invalid(struct load_info *info, int flags);
void mod_stat_bump_becoming(struct load_info *info, int flags);
#else
#define mod_stat_add_long(name, var)
#define mod_stat_inc(name)
static inline int try_add_failed_module(const char *name,
enum fail_dup_mod_reason reason)
{
return 0;
}
static inline void mod_stat_bump_invalid(struct load_info *info, int flags)
{
}
static inline void mod_stat_bump_becoming(struct load_info *info, int flags)
{
}
#endif /* CONFIG_MODULE_STATS */
#ifdef CONFIG_MODULE_DEBUG_AUTOLOAD_DUPS
bool kmod_dup_request_exists_wait(char *module_name, bool wait, int *dup_ret);
void kmod_dup_request_announce(char *module_name, int ret);
#else
static inline bool kmod_dup_request_exists_wait(char *module_name, bool wait, int *dup_ret)
{
return false;
}
static inline void kmod_dup_request_announce(char *module_name, int ret)
{
}
#endif
#ifdef CONFIG_MODULE_UNLOAD_TAINT_TRACKING
struct mod_unload_taint {
struct list_head list;
char name[MODULE_NAME_LEN];
unsigned long taints;
u64 count;
};
int try_add_tainted_module(struct module *mod);
void print_unloaded_tainted_modules(void);
#else /* !CONFIG_MODULE_UNLOAD_TAINT_TRACKING */
static inline int try_add_tainted_module(struct module *mod)
{
return 0;
}
static inline void print_unloaded_tainted_modules(void)
{
}
#endif /* CONFIG_MODULE_UNLOAD_TAINT_TRACKING */
#ifdef CONFIG_MODULE_DECOMPRESS
int module_decompress(struct load_info *info, const void *buf, size_t size);
void module_decompress_cleanup(struct load_info *info);
#else
static inline int module_decompress(struct load_info *info,
const void *buf, size_t size)
{
return -EOPNOTSUPP;
}
static inline void module_decompress_cleanup(struct load_info *info)
{
}
#endif
struct mod_tree_root {
#ifdef CONFIG_MODULES_TREE_LOOKUP
struct latch_tree_root root;
#endif
unsigned long addr_min;
unsigned long addr_max;
#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
unsigned long data_addr_min;
unsigned long data_addr_max;
#endif
};
extern struct mod_tree_root mod_tree;
#ifdef CONFIG_MODULES_TREE_LOOKUP
void mod_tree_insert(struct module *mod);
void mod_tree_remove_init(struct module *mod);
void mod_tree_remove(struct module *mod);
struct module *mod_find(unsigned long addr, struct mod_tree_root *tree);
#else /* !CONFIG_MODULES_TREE_LOOKUP */
static inline void mod_tree_insert(struct module *mod) { }
static inline void mod_tree_remove_init(struct module *mod) { }
static inline void mod_tree_remove(struct module *mod) { }
static inline struct module *mod_find(unsigned long addr, struct mod_tree_root *tree)
{
struct module *mod;
list_for_each_entry_rcu(mod, &modules, list,
lockdep_is_held(&module_mutex)) {
if (within_module(addr, mod))
return mod;
}
return NULL;
}
#endif /* CONFIG_MODULES_TREE_LOOKUP */
int module_enable_rodata_ro(const struct module *mod, bool after_init);
int module_enable_data_nx(const struct module *mod);
int module_enable_text_rox(const struct module *mod);
int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
char *secstrings, struct module *mod);
#ifdef CONFIG_MODULE_SIG
int module_sig_check(struct load_info *info, int flags);
#else /* !CONFIG_MODULE_SIG */
static inline int module_sig_check(struct load_info *info, int flags)
{
return 0;
}
#endif /* !CONFIG_MODULE_SIG */
#ifdef CONFIG_DEBUG_KMEMLEAK
void kmemleak_load_module(const struct module *mod, const struct load_info *info);
#else /* !CONFIG_DEBUG_KMEMLEAK */
static inline void kmemleak_load_module(const struct module *mod,
const struct load_info *info) { }
#endif /* CONFIG_DEBUG_KMEMLEAK */
#ifdef CONFIG_KALLSYMS
void init_build_id(struct module *mod, const struct load_info *info);
void layout_symtab(struct module *mod, struct load_info *info);
void add_kallsyms(struct module *mod, const struct load_info *info);
static inline bool sect_empty(const Elf_Shdr *sect)
{
return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
}
#else /* !CONFIG_KALLSYMS */
static inline void init_build_id(struct module *mod, const struct load_info *info) { }
static inline void layout_symtab(struct module *mod, struct load_info *info) { }
static inline void add_kallsyms(struct module *mod, const struct load_info *info) { }
#endif /* CONFIG_KALLSYMS */
#ifdef CONFIG_SYSFS
int mod_sysfs_setup(struct module *mod, const struct load_info *info,
struct kernel_param *kparam, unsigned int num_params);
void mod_sysfs_teardown(struct module *mod);
void init_param_lock(struct module *mod);
#else /* !CONFIG_SYSFS */
static inline int mod_sysfs_setup(struct module *mod,
const struct load_info *info,
struct kernel_param *kparam,
unsigned int num_params)
{
return 0;
}
static inline void mod_sysfs_teardown(struct module *mod) { }
static inline void init_param_lock(struct module *mod) { }
#endif /* CONFIG_SYSFS */
#ifdef CONFIG_MODVERSIONS
int check_version(const struct load_info *info,
const char *symname, struct module *mod, const s32 *crc);
void module_layout(struct module *mod, struct modversion_info *ver, struct kernel_param *kp,
struct kernel_symbol *ks, struct tracepoint * const *tp);
int check_modstruct_version(const struct load_info *info, struct module *mod);
int same_magic(const char *amagic, const char *bmagic, bool has_crcs);
#else /* !CONFIG_MODVERSIONS */
static inline int check_version(const struct load_info *info,
const char *symname,
struct module *mod,
const s32 *crc)
{
return 1;
}
static inline int check_modstruct_version(const struct load_info *info,
struct module *mod)
{
return 1;
}
static inline int same_magic(const char *amagic, const char *bmagic, bool has_crcs)
{
return strcmp(amagic, bmagic) == 0;
}
#endif /* CONFIG_MODVERSIONS */