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authorShi Weihua <shiwh@cn.fujitsu.com>2010-05-18 04:50:32 +0400
committerChris Mason <chris.mason@oracle.com>2010-06-11 23:57:37 +0400
commit2f26afba46f0ebf155cf9be746496a0304a5b7cf (patch)
tree8127a4a101734efce3c0d0190754f180de05a599 /fs
parentcf1e99a4e0daa4a5623cd71108509823b9ff2d30 (diff)
downloadlinux-2f26afba46f0ebf155cf9be746496a0304a5b7cf.tar.xz
Btrfs: should add a permission check for setfacl
On btrfs, do the following ------------------ # su user1 # cd btrfs-part/ # touch aaa # getfacl aaa # file: aaa # owner: user1 # group: user1 user::rw- group::rw- other::r-- # su user2 # cd btrfs-part/ # setfacl -m u::rwx aaa # getfacl aaa # file: aaa # owner: user1 # group: user1 user::rwx <- successed to setfacl group::rw- other::r-- ------------------ but we should prohibit it that user2 changing user1's acl. In fact, on ext3 and other fs, a message occurs: setfacl: aaa: Operation not permitted This patch fixed it. Signed-off-by: Shi Weihua <shiwh@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/acl.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c
index 6ef7b26724ec..6b4d0cca5c7f 100644
--- a/fs/btrfs/acl.c
+++ b/fs/btrfs/acl.c
@@ -160,6 +160,9 @@ static int btrfs_xattr_acl_set(struct dentry *dentry, const char *name,
int ret;
struct posix_acl *acl = NULL;
+ if (!is_owner_or_cap(dentry->d_inode))
+ return -EPERM;
+
if (value) {
acl = posix_acl_from_xattr(value, size);
if (acl == NULL) {