lkml.org 
[lkml]   [2017]   [Jul]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 4.9 028/125] btrfs: Dont clear SGID when inheriting ACLs
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Jan Kara <jack@suse.cz>

    commit b7f8a09f8097db776b8d160862540e4fc1f51296 upstream.

    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: 073931017b49d9458aa351605b43a7e34598caef
    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>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/btrfs/acl.c | 13 +++++++------
    1 file changed, 7 insertions(+), 6 deletions(-)

    --- a/fs/btrfs/acl.c
    +++ b/fs/btrfs/acl.c
    @@ -78,12 +78,6 @@ static int __btrfs_set_acl(struct btrfs_
    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);
    }


    \
     
     \ /
      Last update: 2017-07-25 22:35    [W:4.596 / U:0.036 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site