thanks, I will update it.
在 2017/1/6 18:10, Jan Kara 写道:
On Fri 06-01-17 16:12:55, Gu Zheng wrote:
This change was missed the tmpfs modification in In CVE-2016-7097
commit 073931017b49d9458aa351605b43a7e34598caef
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>
Ah, good catch. One comment below:
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 5955220..d014dff 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -922,11 +922,10 @@ 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 > 0)
+ return error;
Uh, why this error > 0 check? AFAIU it should be:
if (error < 0)
return 0;
As it used to be before...
Honza
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