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CVE-2014-7975 fs: umount DoS (rhbz 1151108 1152025)

This commit is contained in:
Josh Boyer 2014-10-13 14:48:25 -04:00
parent 5c73e34a13
commit 1e081da152
2 changed files with 40 additions and 0 deletions
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31
fs-Add-a-missing-permission-check-to-do_umount.patch Normal file
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@ -0,0 +1,31 @@
From: Andy Lutomirski <luto@amacapital.net>
Date: Wed, 8 Oct 2014 12:37:46 -0700
Subject: [PATCH] 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.
Cc: stable@vger.kernel.org
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
---
fs/namespace.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/namespace.c b/fs/namespace.c
index c8e3034ff4b2..fbba8b17330d 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1439,6 +1439,8 @@ static int do_umount(struct mount *mnt, int flags)
* Special case for "unmounting" root ...
* we just try to remount it readonly.
*/
+ if (!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);
--
1.9.3

9
kernel.spec
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@ -756,6 +756,9 @@ Patch25111: 0002-ideapad-laptop-Change-Lenovo-Yoga-2-series-rfkill-ha.patch
#CVE-2014-7970 rhbz 1151095 1151484
Patch26032: mnt-Prevent-pivot_root-from-creating-a-loop-in-the-m.patch
#CVE-2014-7975 rhbz 1151108 1152025
Patch26042: fs-Add-a-missing-permission-check-to-do_umount.patch
# END OF PATCH DEFINITIONS
%endif
@ -1454,6 +1457,9 @@ ApplyPatch 0002-ideapad-laptop-Change-Lenovo-Yoga-2-series-rfkill-ha.patch
#CVE-2014-7970 rhbz 1151095 1151484
ApplyPatch mnt-Prevent-pivot_root-from-creating-a-loop-in-the-m.patch
#CVE-2014-7975 rhbz 1151108 1152025
ApplyPatch fs-Add-a-missing-permission-check-to-do_umount.patch
# END OF PATCH APPLICATIONS
%endif
@ -2266,6 +2272,9 @@ fi
# and build.
%changelog
* Mon Oct 13 2014 Josh Boyer <jwboyer@fedoraproject.org>
- CVE-2014-7975 fs: umount DoS (rhbz 1151108 1152025)
* Fri Oct 10 2014 Josh Boyer <jwboyer@fedoraproject.org>
- CVE-2014-7970 VFS: DoS with USER_NS (rhbz 1151095 1151484)