This is a note to let you know that I've just added the patch titled
usermodehelper: check subprocess_info->path != NULL
to the 3.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usermodehelper-check-subprocess_info-path-null.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 264b83c07a84223f0efd0d1db9ccc66d6f88288f Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Date: Thu, 16 May 2013 17:43:55 +0200
Subject: usermodehelper: check subprocess_info->path != NULL
From: Oleg Nesterov <oleg@xxxxxxxxxx>
commit 264b83c07a84223f0efd0d1db9ccc66d6f88288f upstream.
argv_split(empty_or_all_spaces) happily succeeds, it simply returns
argc == 0 and argv[0] == NULL. Change call_usermodehelper_exec() to
check sub_info->path != NULL to avoid the crash.
This is the minimal fix, todo:
- perhaps we should change argv_split() to return NULL or change the
callers.
- kill or justify ->path[0] check
- narrow the scope of helper_lock()
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Acked-By: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/kmod.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -570,6 +570,11 @@ int call_usermodehelper_exec(struct subp
int retval = 0;
helper_lock();
+ if (!sub_info->path) {
+ retval = -EINVAL;
+ goto out;
+ }
+
if (sub_info->path[0] == '\0')
goto out;
Patches currently in stable-queue which might be from oleg@xxxxxxxxxx are
queue-3.9/usermodehelper-check-subprocess_info-path-null.patch
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