linux-kernel - [PATCH 0/4] PVH GDT fixes and cleanup

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 30 Apr 2018 12:23:35 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Cc:     jgross@...e.com, Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: [PATCH 0/4] PVH GDT fixes and cleanup

Switching to new binutils release triggered the first bug.

Not sure if stack canary bug is related to the new tools as well
(haven't checked it with old tools, but they are really old, from
Fedora 13 days).

64-bit guests run fine even without adding the entry for GS but my
guess is that's because Xen toolstack sets cached portions of the
register to sane values and HW makes fewer checks in long mode.
Since those values are not part of the ABI I figured I should fix
it for both 32- and 64-bit mode.

Boris Ostrovsky (4):
  xen/PVH: Replace GDT_ENTRY with explicit constant
  xen/PVH: Use proper CS selector in long mode
  xen/PVH: Set up GS segment for stack canary
  xen/PVH: Remove reserved entry in PVH GDT

 arch/x86/xen/xen-pvh.S | 28 +++++++++++++++++++---------
 1 file changed, 19 insertions(+), 9 deletions(-)

-- 
2.9.3