From: Mark Salyzyn Date: Thu, 29 Aug 2019 18:30:14 +0000 (-0700) Subject: ovl: filter of trusted xattr results in audit X-Git-Tag: v4.9.195~15 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3fe1e271c7559076cba12bd9f3ba84f1979f064a;p=platform%2Fkernel%2Flinux-amlogic.git ovl: filter of trusted xattr results in audit commit 5c2e9f346b815841f9bed6029ebcb06415caf640 upstream. When filtering xattr list for reading, presence of trusted xattr results in a security audit log. However, if there is other content no errno will be set, and if there isn't, the errno will be -ENODATA and not -EPERM as is usually associated with a lack of capability. The check does not block the request to list the xattrs present. Switch to ns_capable_noaudit to reflect a more appropriate check. Signed-off-by: Mark Salyzyn Cc: linux-security-module@vger.kernel.org Cc: kernel-team@android.com Cc: stable@vger.kernel.org # v3.18+ Fixes: a082c6f680da ("ovl: filter trusted xattr for non-admin") Signed-off-by: Miklos Szeredi Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index 16f6db8..804b346 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -234,7 +234,8 @@ static bool ovl_can_list(const char *s) return true; /* Never list trusted.overlay, list other trusted for superuser only */ - return !ovl_is_private_xattr(s) && capable(CAP_SYS_ADMIN); + return !ovl_is_private_xattr(s) && + ns_capable_noaudit(&init_user_ns, CAP_SYS_ADMIN); } ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size)