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| author | Gu Zheng <guzheng1@huawei.com> | 2017-01-09 09:34:48 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-26 08:23:47 +0100 |
| commit | 36672b8b99e2cf2ab0587f08a19f394f8f65a861 (patch) | |
| tree | 07ebe8e8bc6550367ea6bd298ca538a2160417e5 /fs | |
| parent | 39d7c9ce35a1279bf84f81fe6dc351b5c6271a34 (diff) | |
| download | linux-stable-36672b8b99e2cf2ab0587f08a19f394f8f65a861.tar.gz linux-stable-36672b8b99e2cf2ab0587f08a19f394f8f65a861.tar.bz2 linux-stable-36672b8b99e2cf2ab0587f08a19f394f8f65a861.zip | |
tmpfs: clear S_ISGID when setting posix ACLs
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/posix_acl.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/fs/posix_acl.c b/fs/posix_acl.c index a60d3cc5b55d..993bb3b5f4d5 100644 --- a/fs/posix_acl.c +++ b/fs/posix_acl.c @@ -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; |