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tmpfs: clear S_ISGID when setting posix ACLs

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commit 497de07d89c1410d76a15bec2bb41f24a2a89f31 upstream.

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@huawei.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Brad Spengler <spender@grsecurity.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gu Zheng 2017-01-09 09:34:48 +08:00 committed by Greg Kroah-Hartman
parent 39d7c9ce35
commit 36672b8b99
1 changed files with 4 additions and 5 deletions
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9
fs/posix_acl.c
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@ -903,11 +903,10 @@ 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;