diff options
author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2011-07-26 19:08:41 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-26 19:49:44 -0400 |
commit | 912193521b719fbfc2f16776febf5232fe8ba261 (patch) | |
tree | df180e94ec0595744da6eb11f6164e539c73ea91 /fs/exec.c | |
parent | aacb3d17a73f6447c04e4d769391238dcf85568d (diff) |
exec: do not call request_module() twice from search_binary_handler()
Currently, search_binary_handler() tries to load binary loader module
using request_module() if a loader for the requested program is not yet
loaded. But second attempt of request_module() does not affect the result
of search_binary_handler().
If request_module() triggered recursion, calling request_module() twice
causes 2 to the power of MAX_KMOD_CONCURRENT (= 50) repetitions. It is
not an infinite loop but is sufficient for users to consider as a hang up.
Therefore, this patch changes not to call request_module() twice, making 1
to the power of MAX_KMOD_CONCURRENT repetitions in case of recursion.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: Richard Weinberger <richard@nod.at>
Tested-by: Richard Weinberger <richard@nod.at>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/exec.c')
-rw-r--r-- | fs/exec.c | 2 |
1 files changed, 2 insertions, 0 deletions
@@ -1440,6 +1440,8 @@ int search_binary_handler(struct linux_binprm *bprm,struct pt_regs *regs) | |||
1440 | printable(bprm->buf[2]) && | 1440 | printable(bprm->buf[2]) && |
1441 | printable(bprm->buf[3])) | 1441 | printable(bprm->buf[3])) |
1442 | break; /* -ENOEXEC */ | 1442 | break; /* -ENOEXEC */ |
1443 | if (try) | ||
1444 | break; /* -ENOEXEC */ | ||
1443 | request_module("binfmt-%04x", *(unsigned short *)(&bprm->buf[2])); | 1445 | request_module("binfmt-%04x", *(unsigned short *)(&bprm->buf[2])); |
1444 | #endif | 1446 | #endif |
1445 | } | 1447 | } |