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authorKirill Korotaev <dev@sw.ru>2006-09-29 05:00:05 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-29 12:18:12 -0400
commit3b9b8ab65d8eed784b9164d03807cb2bda7b5cd6 (patch)
tree104c7b01768acd7e152cbf66e4868a73804e8af9 /fs/exec.c
parentfc09561d6392771a392dea55c287de7e849b6b63 (diff)
[PATCH] Fix unserialized task->files changing
Fixed race on put_files_struct on exec with proc. Restoring files on current on error path may lead to proc having a pointer to already kfree-d files_struct. ->files changing at exit.c and khtread.c are safe as exit_files() makes all things under lock. Found during OpenVZ stress testing. [akpm@osdl.org: add export] Signed-off-by: Pavel Emelianov <xemul@openvz.org> Signed-off-by: Kirill Korotaev <dev@openvz.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/exec.c')
-rw-r--r--fs/exec.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 97df6e0aeaee..a8efe35176b0 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -898,8 +898,7 @@ int flush_old_exec(struct linux_binprm * bprm)
898 return 0; 898 return 0;
899 899
900mmap_failed: 900mmap_failed:
901 put_files_struct(current->files); 901 reset_files_struct(current, files);
902 current->files = files;
903out: 902out:
904 return retval; 903 return retval;
905} 904}