[CVE-2017-5551][PATCH Yakkety] tmpfs: clear S_ISGID when setting posix ACLs

[Po-Hsu Lin]

From: Gu Zheng <guzheng1 at huawei.com>

CVE-2017-5551

This change was missed the tmpfs modification in In CVE-2016-7097
commit 073931017b49 ("posix_acl: Clear SGID bit when setting
file permissions")
It can test by xfstest generic/375, which failed to clear
setgid bit in the following test case on tmpfs:

  touch $testfile
  chown 100:100 $testfile
  chmod 2755 $testfile
  _runas -u 100 -g 101 -- setfacl -m u::rwx,g::rwx,o::rwx $testfile

Signed-off-by: Gu Zheng <guzheng1 at huawei.com>
Signed-off-by: Al Viro <viro at zeniv.linux.org.uk>
(cherry picked from commit 497de07d89c1410d76a15bec2bb41f24a2a89f31)

Signed-off-by: Po-Hsu Lin <po-hsu.lin at canonical.com>
---
 fs/posix_acl.c |    9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index adf1e18..df15c56 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -931,11 +931,10 @@ int simple_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 	int error;
 
 	if (type == ACL_TYPE_ACCESS) {
-		error = posix_acl_equiv_mode(acl, &inode->i_mode);
-		if (error < 0)
-			return 0;
-		if (error == 0)
-			acl = NULL;
+		error = posix_acl_update_mode(inode,
+				&inode->i_mode, &acl);
+		if (error)
+			return error;
 	}
 
 	inode->i_ctime = CURRENT_TIME;
-- 
1.7.9.5