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btrfs: Don't clear SGID when inheriting ACLs

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When new directory 'DIR1' is created in a directory 'DIR0' with SGID bit
set, DIR1 is expected to have SGID bit set (and owning group equal to
the owning group of 'DIR0'). However when 'DIR0' also has some default
ACLs that 'DIR1' inherits, setting these ACLs will result in SGID bit on
'DIR1' to get cleared if user is not member of the owning group.

Fix the problem by moving posix_acl_update_mode() out of
__btrfs_set_acl() into btrfs_set_acl(). That way the function will not be
called when inheriting ACLs which is what we want as it prevents SGID
bit clearing and the mode has been properly set by posix_acl_create()
anyway.

Fixes: 073931017b
CC: stable@vger.kernel.org
CC: linux-btrfs@vger.kernel.org
CC: David Sterba <dsterba@suse.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Jan Kara 2017-06-22 15:31:07 +02:00 committed by David Sterba
parent 6374e57ad8
commit b7f8a09f80
1 changed files with 7 additions and 6 deletions
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13
fs/btrfs/acl.c
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@ -78,12 +78,6 @@ static int __btrfs_set_acl(struct btrfs_trans_handle *trans,
switch (type) {
case ACL_TYPE_ACCESS:
name = XATTR_NAME_POSIX_ACL_ACCESS;
if (acl) {
ret = posix_acl_update_mode(inode, &inode->i_mode, &acl);
if (ret)
return ret;
}
ret = 0;
break;
case ACL_TYPE_DEFAULT:
if (!S_ISDIR(inode->i_mode))
@ -119,6 +113,13 @@ out:
int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
int ret;
if (type == ACL_TYPE_ACCESS && acl) {
ret = posix_acl_update_mode(inode, &inode->i_mode, &acl);
if (ret)
return ret;
}
return __btrfs_set_acl(NULL, inode, acl, type);
}