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Btrfs: should add a permission check for setfacl

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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>
This commit is contained in:
Shi Weihua 2010-05-18 00:50:32 +00:00 committed by Chris Mason
parent cf1e99a4e0
commit 2f26afba46
1 changed files with 3 additions and 0 deletions
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3
fs/btrfs/acl.c
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@ -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) {