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author | Oleg Nesterov <oleg@redhat.com> | 2013-09-11 14:24:46 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-11 15:59:09 -0700 |
commit | 6b3c538f5b2cfc53cb6803ec5001bbcf8f18a98e (patch) | |
tree | 5a3dd78b655c93d7248facb2377be2630435b1fc /fs | |
parent | 4e0621a07ea58a0dc15859be3b743bdeb194a51b (diff) | |
download | op-kernel-dev-6b3c538f5b2cfc53cb6803ec5001bbcf8f18a98e.zip op-kernel-dev-6b3c538f5b2cfc53cb6803ec5001bbcf8f18a98e.tar.gz |
exec: cleanup the error handling in search_binary_handler()
The error hanling and ret-from-loop look confusing and inconsistent.
- "retval >= 0" simply returns
- "!bprm->file" returns too but with read_unlock() because
binfmt_lock was already re-acquired
- "retval != -ENOEXEC || bprm->mm == NULL" does "break" and
relies on the same check after the main loop
Consolidate these checks into a single if/return statement.
need_retry still checks "retval == -ENOEXEC", but this and -ENOENT before
the main loop are not needed. This is only for pathological and
impossible list_empty(&formats) case.
It is not clear why do we check "bprm->mm == NULL", probably this
should be removed.
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>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/exec.c | 11 |
1 files changed, 3 insertions, 8 deletions
@@ -1399,22 +1399,17 @@ int search_binary_handler(struct linux_binprm *bprm) bprm->recursion_depth++; retval = fmt->load_binary(bprm); bprm->recursion_depth--; - if (retval >= 0) { + if (retval >= 0 || retval != -ENOEXEC || + bprm->mm == NULL || bprm->file == NULL) { put_binfmt(fmt); return retval; } read_lock(&binfmt_lock); put_binfmt(fmt); - if (retval != -ENOEXEC || bprm->mm == NULL) - break; - if (!bprm->file) { - read_unlock(&binfmt_lock); - return retval; - } } read_unlock(&binfmt_lock); - if (need_retry && retval == -ENOEXEC && bprm->mm) { + if (need_retry && retval == -ENOEXEC) { if (printable(bprm->buf[0]) && printable(bprm->buf[1]) && printable(bprm->buf[2]) && printable(bprm->buf[3])) return retval; |