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authorAlexey Dobriyan <adobriyan@sw.ru>2007-05-08 00:28:39 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 11:15:08 -0700
commitea07890a680273b25127129fb555aac0d9324bea (patch)
treeb0742aa5dd90792dc10be3563c1181582d0f5d9e /include/linux/module.h
parentae84e324709d6320ed8c1fd7b1736fcbaf26df95 (diff)
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 <adobriyan@sw.ru> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/module.h')
-rw-r--r--include/linux/module.h21
1 files changed, 7 insertions, 14 deletions
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 */