| commit | 9d65cb4a1718a072898c7a57a3bc61b2dc4bcd4d | |
| author | Alexey Dobriyan <adobriyan@sw.ru> | |
| Tue, 8 May 2007 07:28:43 +0000 (8 00:28 -0700) | ||
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | |
| Tue, 8 May 2007 18:15:08 +0000 (8 11:15 -0700) | ||
| tree | 9e3fd1c9e61e8ed16959d115a9a3f6f7eb0bbf21 | treesnapshot (tar.gz zip) |
| parent | ffb45122766db220d0bf3d01848d575fbbcb6430 | commitdiff |
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>
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>