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authorAlexey Dobriyan <adobriyan@sw.ru>2007-05-08 03:28:43 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 14:15:08 -0400
commit9d65cb4a1718a072898c7a57a3bc61b2dc4bcd4d (patch)
tree9e3fd1c9e61e8ed16959d115a9a3f6f7eb0bbf21 /include/linux/kallsyms.h
parentffb45122766db220d0bf3d01848d575fbbcb6430 (diff)
Fix race between cat /proc/*/wchan and rmmod et al
kallsyms_lookup() can go iterating over modules list unprotected which is OK for emergency situations (oops), but not OK for regular stuff like /proc/*/wchan. Introduce lookup_symbol_name()/lookup_module_symbol_name() which copy symbol name into caller-supplied buffer or return -ERANGE. All copying is done with module_mutex held, so... Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/kallsyms.h')
-rw-r--r--include/linux/kallsyms.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h
index 3e3b92dabe3b..ae0117a95cfd 100644
--- a/include/linux/kallsyms.h
+++ b/include/linux/kallsyms.h
@@ -30,6 +30,8 @@ extern int sprint_symbol(char *buffer, unsigned long address);
30/* Look up a kernel symbol and print it to the kernel messages. */ 30/* Look up a kernel symbol and print it to the kernel messages. */
31extern void __print_symbol(const char *fmt, unsigned long address); 31extern void __print_symbol(const char *fmt, unsigned long address);
32 32
33int lookup_symbol_name(unsigned long addr, char *symname);
34
33#else /* !CONFIG_KALLSYMS */ 35#else /* !CONFIG_KALLSYMS */
34 36
35static inline unsigned long kallsyms_lookup_name(const char *name) 37static inline unsigned long kallsyms_lookup_name(const char *name)
@@ -58,6 +60,11 @@ static inline int sprint_symbol(char *buffer, unsigned long addr)
58 return 0; 60 return 0;
59} 61}
60 62
63static inline int lookup_symbol_name(unsigned long addr, char *symname)
64{
65 return -ERANGE;
66}
67
61/* Stupid that this does nothing, but I didn't create this mess. */ 68/* Stupid that this does nothing, but I didn't create this mess. */
62#define __print_symbol(fmt, addr) 69#define __print_symbol(fmt, addr)
63#endif /*CONFIG_KALLSYMS*/ 70#endif /*CONFIG_KALLSYMS*/