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[PATCH] Fix unserialized task->files changing

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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>
This commit is contained in:
Kirill Korotaev 2006-09-29 02:00:05 -07:00 • committed by Linus Torvalds
parent fc09561d63
commit 3b9b8ab65d
5 changed files with 18 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

6
fs/binfmt_elf.c
View file

@ -1038,10 +1038,8 @@ out_free_interp:
out_free_file:
sys_close(elf_exec_fileno);
out_free_fh:
if (files) {
put_files_struct(current->files);
current->files = files;
}
if (files)
reset_files_struct(current, files);
out_free_ph:
kfree(elf_phdata);
goto out;