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| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2011-06-13 13:49:11 +0900 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2011-06-14 15:18:42 +1000 |
| commit | 4e78c724d47e2342aa8fde61f6b8536f662f795f (patch) | |
| tree | 9256c52a1e40b593601647bcc1d8d8e588188f77 /security/tomoyo | |
| parent | 2c53b436a30867eb6b47dd7bab23ba638d1fb0d2 (diff) | |
| download | lwn-4e78c724d47e2342aa8fde61f6b8536f662f795f.tar.gz lwn-4e78c724d47e2342aa8fde61f6b8536f662f795f.zip | |
TOMOYO: Fix oops in tomoyo_mount_acl().
In tomoyo_mount_acl() since 2.6.36, kern_path() was called without checking
dev_name != NULL. As a result, an unprivileged user can trigger oops by issuing
mount(NULL, "/", "ext3", 0, NULL) request.
Fix this by checking dev_name != NULL before calling kern_path(dev_name).
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: stable@kernel.org
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/tomoyo')
| -rw-r--r-- | security/tomoyo/mount.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/security/tomoyo/mount.c b/security/tomoyo/mount.c index 162a864dba24..9fc2e15841c9 100644 --- a/security/tomoyo/mount.c +++ b/security/tomoyo/mount.c @@ -138,7 +138,7 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name, } if (need_dev) { /* Get mount point or device file. */ - if (kern_path(dev_name, LOOKUP_FOLLOW, &path)) { + if (!dev_name || kern_path(dev_name, LOOKUP_FOLLOW, &path)) { error = -ENOENT; goto out; } |