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authorJan Kara <jack@suse.cz>2016-09-19 17:39:09 +0200
committerJan Kara <jack@suse.cz>2016-09-22 10:55:32 +0200
commit073931017b49d9458aa351605b43a7e34598caef (patch)
tree8c4374e82e5cad92bdb589e5be417f1a94870399 /fs/orangefs/acl.c
parentudf: don't bother with full-page write optimisations in adinicb case (diff)
downloadlinux-dev-073931017b49d9458aa351605b43a7e34598caef.tar.xz
linux-dev-073931017b49d9458aa351605b43a7e34598caef.zip
posix_acl: Clear SGID bit when setting file permissions
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>
Diffstat (limited to 'fs/orangefs/acl.c')
-rw-r--r--fs/orangefs/acl.c15
1 files changed, 5 insertions, 10 deletions
diff --git a/fs/orangefs/acl.c b/fs/orangefs/acl.c
index 28f2195cd798..7a3754488312 100644
--- a/fs/orangefs/acl.c
+++ b/fs/orangefs/acl.c
@@ -73,14 +73,11 @@ int orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
case ACL_TYPE_ACCESS:
name = XATTR_NAME_POSIX_ACL_ACCESS;
if (acl) {
- umode_t mode = inode->i_mode;
- /*
- * can we represent this with the traditional file
- * mode permission bits?
- */
- error = posix_acl_equiv_mode(acl, &mode);
- if (error < 0) {
- gossip_err("%s: posix_acl_equiv_mode err: %d\n",
+ umode_t mode;
+
+ error = posix_acl_update_mode(inode, &mode, &acl);
+ if (error) {
+ gossip_err("%s: posix_acl_update_mode err: %d\n",
__func__,
error);
return error;
@@ -90,8 +87,6 @@ int orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
SetModeFlag(orangefs_inode);
inode->i_mode = mode;
mark_inode_dirty_sync(inode);
- if (error == 0)
- acl = NULL;
}
break;
case ACL_TYPE_DEFAULT: