On 07/18/2017 11:19 AM, Jan Kara wrote:
> On Thu 22-06-17 15:31:10, Jan Kara wrote:
>> 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
>> __jfs_set_acl() into jfs_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: 073931017b49d9458aa351605b43a7e34598caef
>> CC: stable@xxxxxxxxxxxxxxx
>> CC: Dave Kleikamp <shaggy@xxxxxxxxxx>
>> CC: jfs-discussion@xxxxxxxxxxxxxxxxxxxxx
>> Signed-off-by: Jan Kara <jack@xxxxxxx>
>
> Dave, can you please pick up this fix? Thanks!
Yeah. I'll take care if it.
Thanks,
Shaggy
>
> Honza
>
>> ---
>> fs/jfs/acl.c | 15 ++++++++-------
>> 1 file changed, 8 insertions(+), 7 deletions(-)
>>
>> diff --git a/fs/jfs/acl.c b/fs/jfs/acl.c
>> index 7bc186f4ed4d..1be45c8d460d 100644
>> --- a/fs/jfs/acl.c
>> +++ b/fs/jfs/acl.c
>> @@ -77,13 +77,6 @@ static int __jfs_set_acl(tid_t tid, struct inode *inode, int type,
>> switch (type) {
>> case ACL_TYPE_ACCESS:
>> ea_name = XATTR_NAME_POSIX_ACL_ACCESS;
>> - if (acl) {
>> - rc = posix_acl_update_mode(inode, &inode->i_mode, &acl);
>> - if (rc)
>> - return rc;
>> - inode->i_ctime = current_time(inode);
>> - mark_inode_dirty(inode);
>> - }
>> break;
>> case ACL_TYPE_DEFAULT:
>> ea_name = XATTR_NAME_POSIX_ACL_DEFAULT;
>> @@ -118,9 +111,17 @@ int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
>>
>> tid = txBegin(inode->i_sb, 0);
>> mutex_lock(&JFS_IP(inode)->commit_mutex);
>> + if (type == ACL_TYPE_ACCESS && acl) {
>> + rc = posix_acl_update_mode(inode, &inode->i_mode, &acl);
>> + if (rc)
>> + goto end_tx;
>> + inode->i_ctime = current_time(inode);
>> + mark_inode_dirty(inode);
>> + }
>> rc = __jfs_set_acl(tid, inode, type, acl);
>> if (!rc)
>> rc = txCommit(tid, 1, &inode, 0);
>> +end_tx:
>> txEnd(tid);
>> mutex_unlock(&JFS_IP(inode)->commit_mutex);
>> return rc;
>> --
>> 2.12.3
>>
