From: Andreas Gruenbacher <agruenba@redhat.com>
Date: Sun, 4 Oct 2015 17:18:50 +0000 (+0200)
Subject: jffs2: Add missing capability check for listing trusted xattrs
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=bf781714b3e1421a0ebcd0137d081e6566a89f15;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

jffs2: Add missing capability check for listing trusted xattrs

The vfs checks if a task has the appropriate access for get and set
operations, but it cannot do that for the list operation; the file system
must check for that itself.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: linux-mtd@lists.infradead.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/jffs2/xattr_trusted.c b/fs/jffs2/xattr_trusted.c
index ceaf9c693225..bbd20c16090e 100644
--- a/fs/jffs2/xattr_trusted.c
+++ b/fs/jffs2/xattr_trusted.c
@@ -39,6 +39,9 @@ static size_t jffs2_trusted_listxattr(struct dentry *dentry, char *list,
 {
 	size_t retlen = XATTR_TRUSTED_PREFIX_LEN + name_len + 1;
 
+	if (!capable(CAP_SYS_ADMIN))
+		return 0;
+
 	if (list && retlen<=list_size) {
 		strcpy(list, XATTR_TRUSTED_PREFIX);
 		strcpy(list + XATTR_TRUSTED_PREFIX_LEN, name);