diff options
| author | Jan Kara <jack@suse.cz> | 2016-09-19 18:39:09 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-08 08:44:10 +0300 |
| commit | d8333c045f045385a914013a220cd1ed54c88d48 (patch) | |
| tree | 6f3354eeb66b4277f03d695b1c88d1d2f091f6c6 /fs/f2fs/acl.c | |
| parent | 5a7b3b1ec16b6bfa57752d37292988e64fcdd172 (diff) | |
| download | linux-d8333c045f045385a914013a220cd1ed54c88d48.tar.xz | |
posix_acl: Clear SGID bit when setting file permissions
commit 073931017b49d9458aa351605b43a7e34598caef upstream.
When file permissions are modified via chmod(2) and the user is not in
the owning group or capable of CAP_FSETID, the setgid bit is cleared in
inode_change_ok(). Setting a POSIX ACL via setxattr(2) sets the file
permissions as well as the new ACL, but doesn't clear the setgid bit in
a similar way; this allows to bypass the check in chmod(2). Fix that.
References: CVE-2016-7097
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/f2fs/acl.c')
| -rw-r--r-- | fs/f2fs/acl.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/fs/f2fs/acl.c b/fs/f2fs/acl.c index 83b9b5a8d112..f12d5c5ecc31 100644 --- a/fs/f2fs/acl.c +++ b/fs/f2fs/acl.c @@ -207,12 +207,10 @@ static int __f2fs_set_acl(struct inode *inode, int type, case ACL_TYPE_ACCESS: name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS; if (acl) { - error = posix_acl_equiv_mode(acl, &inode->i_mode); - if (error < 0) + error = posix_acl_update_mode(inode, &inode->i_mode, &acl); + if (error) return error; set_acl_inode(fi, inode->i_mode); - if (error == 0) - acl = NULL; } break; |