The commit is pushed to "branch-rh7-3.10.0-327.10.1.vz7.12.x-ovz" and will
appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-327.10.1.vz7.12.1
------>
commit 569b07f3ea0a2e06f5f3f043d2b757f226edf703
Author: Pavel Tikhomirov <[email protected]>
Date: Tue Mar 15 20:04:12 2016 +0400
ms/fs: Add a missing permission check to do_umount
ms commit a1480dcc3c70 ("fs: Add a missing permission check to do_umount")
Accessing do_remount_sb should require global CAP_SYS_ADMIN, but
only one of the two call sites was appropriately protected.
Fixes CVE-2014-7975.
Signed-off-by: Andy Lutomirski <[email protected]>
Signed-off-by: Pavel Tikhomirov <[email protected]>
Found during investigation of
https://jira.sw.ru/browse/PSBM-43294
---
fs/namespace.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/namespace.c b/fs/namespace.c
index dba0c40..c4e4336 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1287,6 +1287,8 @@ static int do_umount(struct mount *mnt, int flags)
* Special case for "unmounting" root ...
* we just try to remount it readonly.
*/
+ if (!ve_capable(CAP_SYS_ADMIN))
+ return -EPERM;
down_write(&sb->s_umount);
if (!(sb->s_flags & MS_RDONLY))
retval = do_remount_sb(sb, MS_RDONLY, NULL, 0);
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