diff options
| author | Kirill Korotaev <dev@sw.ru> | 2006-09-29 02:00:05 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-29 09:18:12 -0700 |
| commit | 3b9b8ab65d8eed784b9164d03807cb2bda7b5cd6 (patch) | |
| tree | 104c7b01768acd7e152cbf66e4868a73804e8af9 /fs | |
| parent | fc09561d6392771a392dea55c287de7e849b6b63 (diff) | |
| download | lwn-3b9b8ab65d8eed784b9164d03807cb2bda7b5cd6.tar.gz lwn-3b9b8ab65d8eed784b9164d03807cb2bda7b5cd6.zip | |
[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')
| -rw-r--r-- | fs/binfmt_elf.c | 6 | ||||
| -rw-r--r-- | fs/binfmt_misc.c | 6 | ||||
| -rw-r--r-- | fs/exec.c | 3 |
3 files changed, 5 insertions, 10 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index dfd8cfb7fb5d..bb43da5cde5c 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -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; diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c index 66ba137f8661..1713c48fef54 100644 --- a/fs/binfmt_misc.c +++ b/fs/binfmt_misc.c @@ -215,10 +215,8 @@ _error: bprm->interp_flags = 0; bprm->interp_data = 0; _unshare: - if (files) { - put_files_struct(current->files); - current->files = files; - } + if (files) + reset_files_struct(current, files); goto _ret; } 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) return 0; mmap_failed: - put_files_struct(current->files); - current->files = files; + reset_files_struct(current, files); out: return retval; } |