This is a note to let you know that I've just added the patch titled
tmpfs: clear S_ISGID when setting posix ACLs
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tmpfs-clear-s_isgid-when-setting-posix-acls.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 497de07d89c1410d76a15bec2bb41f24a2a89f31 Mon Sep 17 00:00:00 2001
From: Gu Zheng <guzheng1@xxxxxxxxxx>
Date: Mon, 9 Jan 2017 09:34:48 +0800
Subject: tmpfs: clear S_ISGID when setting posix ACLs
From: Gu Zheng <guzheng1@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Brad Spengler <spender@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/posix_acl.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -922,11 +922,10 @@ int simple_set_acl(struct inode *inode,
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(inode);
Patches currently in stable-queue which might be from guzheng1@xxxxxxxxxx are
queue-4.9/tmpfs-clear-s_isgid-when-setting-posix-acls.patch
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