diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2013-09-12 01:24:45 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-12 02:59:07 +0400 |
| commit | 4e0621a07ea58a0dc15859be3b743bdeb194a51b (patch) | |
| tree | 954721cb1776b325b74a48b1858d1b0ac6ff580b | |
| parent | cb7b6b1cbc20a970c7124efae1c2478155604b54 (diff) | |
| download | linux-4e0621a07ea58a0dc15859be3b743bdeb194a51b.tar.xz | |
exec: don't retry if request_module() fails
A separate one-liner for better documentation.
It doesn't make sense to retry if request_module() fails to exec
/sbin/modprobe, add the additional "request_module() < 0" check.
However, this logic still doesn't look exactly right:
1. It would be better to check "request_module() != 0", the user
space modprobe process should report the correct exit code.
But I didn't dare to add the user-visible change.
2. The whole ENOEXEC logic looks suboptimal. Suppose that we try
to exec a "#!path-to-unsupported-binary" script. In this case
request_module() + "retry" will be done twice: first by the
"depth == 1" code, and then again by the "depth == 0" caller
which doesn't make sense.
3. And note that in the case above bprm->buf was already changed
by load_script()->prepare_binprm(), so this looks even more
ugly.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Evgeniy Polyakov <zbr@ioremap.net>
Cc: Zach Levis <zml@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/exec.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/exec.c b/fs/exec.c index ba357e6aea98..635b586de336 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1418,7 +1418,8 @@ int search_binary_handler(struct linux_binprm *bprm) if (printable(bprm->buf[0]) && printable(bprm->buf[1]) && printable(bprm->buf[2]) && printable(bprm->buf[3])) return retval; - request_module("binfmt-%04x", *(ushort *)(bprm->buf + 2)); + if (request_module("binfmt-%04x", *(ushort *)(bprm->buf + 2)) < 0) + return retval; need_retry = false; goto retry; } |