mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-10 20:44:09 +08:00
b7b4eebdba
This new struct composes the linker provided (vector,len) section, and provides a place to add other __dyndbg[] state-data later: descs - the vector of descriptors in __dyndbg section. num_descs - length of the data/section. Use it, in several different ways, as follows: In lib/dynamic_debug.c: ddebug_add_module(): Alter params-list, replacing 2 args (array,index) with a struct _ddebug_info * containing them both, with room for expansion. This helps future-proof the function prototype against the looming addition of class-map info into the dyndbg-state, by providing a place to add more member fields later. NB: later add static struct _ddebug_info builtins_state declaration, not needed yet. ddebug_add_module() is called in 2 contexts: In dynamic_debug_init(), declare, init a struct _ddebug_info di auto-var to use as a cursor. Then iterate over the prdbg blocks of the builtin modules, and update the di cursor before calling _add_module for each. Its called from kernel/module/main.c:load_info() for each loaded module: In internal.h, alter struct load_info, replacing the dyndbg array,len fields with an embedded _ddebug_info containing them both; and populate its members in find_module_sections(). The 2 calling contexts differ in that _init deals with contiguous subranges of __dyndbgs[] section, packed together, while loadable modules are added one at a time. So rename ddebug_add_module() into outer/__inner fns, call __inner from _init, and provide the offset into the builtin __dyndbgs[] where the module's prdbgs reside. The cursor provides start, len of the subrange for each. The offset will be used later to pack the results of builtin __dyndbg_sites[] de-duplication, and is 0 and unneeded for loadable modules, Note: kernel/module/main.c includes <dynamic_debug.h> for struct _ddeubg_info. This might be prone to include loops, since its also included by printk.h. Nothing has broken in robot-land on this. cc: Luis Chamberlain <mcgrof@kernel.org> Signed-off-by: Jim Cromie <jim.cromie@gmail.com> Link: https://lore.kernel.org/r/20220904214134.408619-12-jim.cromie@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
306 lines
8.6 KiB
C
306 lines
8.6 KiB
C
/* 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)
|
|
*/
|
|
|
|
#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
|
|
|
|
/* If this is set, the section belongs in the init part of the module */
|
|
#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG - 1))
|
|
/* Maximum number of characters written by module_flags() */
|
|
#define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4)
|
|
|
|
#ifndef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
|
|
#define data_layout core_layout
|
|
#endif
|
|
|
|
/*
|
|
* Modules' sections will be aligned on page boundaries
|
|
* to ensure complete separation of code and data, but
|
|
* only when CONFIG_STRICT_MODULE_RWX=y
|
|
*/
|
|
static inline unsigned int strict_align(unsigned int size)
|
|
{
|
|
if (IS_ENABLED(CONFIG_STRICT_MODULE_RWX))
|
|
return PAGE_ALIGN(size);
|
|
else
|
|
return size;
|
|
}
|
|
|
|
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[];
|
|
|
|
#include <linux/dynamic_debug.h>
|
|
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;
|
|
struct _ddebug_info dyndbg;
|
|
bool sig_ok;
|
|
#ifdef CONFIG_KALLSYMS
|
|
unsigned long mod_kallsyms_init_off;
|
|
#endif
|
|
#ifdef CONFIG_MODULE_DECOMPRESS
|
|
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(struct module *mod, unsigned int *size, 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);
|
|
|
|
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
|
|
}
|
|
|
|
#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;
|
|
};
|
|
|
|
extern struct mod_tree_root mod_tree;
|
|
extern struct mod_tree_root mod_data_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 */
|
|
|
|
void module_enable_ro(const struct module *mod, bool after_init);
|
|
void module_enable_nx(const struct module *mod);
|
|
void module_enable_x(const struct module *mod);
|
|
int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
|
|
char *secstrings, struct module *mod);
|
|
bool module_check_misalignment(const 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);
|
|
unsigned long find_kallsyms_symbol_value(struct module *mod, const char *name);
|
|
|
|
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 */
|