From ea07890a680273b25127129fb555aac0d9324bea Mon Sep 17 00:00:00 2001 From: Alexey Dobriyan Date: Tue, 8 May 2007 00:28:39 -0700 Subject: Fix race between rmmod and cat /proc/kallsyms module_get_kallsym() leaks "struct module *" outside of module_mutex which is no-no, because module can dissapear right after mutex unlock. Copy all needed information from inside module_mutex into caller-supplied space. [bunk@stusta.de: is_exported() can now become static] Signed-off-by: Alexey Dobriyan Cc: Rusty Russell Signed-off-by: Adrian Bunk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/module.h | 21 +++++++-------------- 1 file changed, 7 insertions(+), 14 deletions(-) (limited to 'include/linux/module.h') diff --git a/include/linux/module.h b/include/linux/module.h index 79993021662..58d5a10cdf0 100644 --- a/include/linux/module.h +++ b/include/linux/module.h @@ -370,16 +370,14 @@ struct module *module_text_address(unsigned long addr); struct module *__module_text_address(unsigned long addr); int is_module_address(unsigned long addr); -/* Returns module and fills in value, defined and namebuf, or NULL if +/* Returns 0 and fills in value, defined and namebuf, or -ERANGE if symnum out of range. */ -struct module *module_get_kallsym(unsigned int symnum, unsigned long *value, - char *type, char *name); +int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, + char *name, char *module_name, int *exported); /* Look for this name: can be of form module:name. */ unsigned long module_kallsyms_lookup_name(const char *name); -int is_exported(const char *name, const struct module *mod); - extern void __module_put_and_exit(struct module *mod, long code) __attribute__((noreturn)); #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code); @@ -527,11 +525,11 @@ static inline const char *module_address_lookup(unsigned long addr, return NULL; } -static inline struct module *module_get_kallsym(unsigned int symnum, - unsigned long *value, - char *type, char *name) +static inline int module_get_kallsym(unsigned int symnum, unsigned long *value, + char *type, char *name, + char *module_name, int *exported) { - return NULL; + return -ERANGE; } static inline unsigned long module_kallsyms_lookup_name(const char *name) @@ -539,11 +537,6 @@ static inline unsigned long module_kallsyms_lookup_name(const char *name) return 0; } -static inline int is_exported(const char *name, const struct module *mod) -{ - return 0; -} - static inline int register_module_notifier(struct notifier_block * nb) { /* no events will happen anyway, so this can always succeed */ -- cgit v1.2.3