linux-kernel - [PATCH 0/3] More machine check recovery fixes

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:   Tue,  6 Jul 2021 12:06:17 -0700
From:   Tony Luck <tony.luck@...el.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Tony Luck <tony.luck@...el.com>, Ding Hui <dinghui@...gfor.com.cn>,
        naoya.horiguchi@....com, osalvador@...e.de,
        Youquan Song <youquan.song@...el.com>, huangcun@...gfor.com.cn,
        x86@...nel.org, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] More machine check recovery fixes

Fix a couple of issues in machine check handling

1) A repeated machine check inside the kernel without calling the task
   work function between machine checks it will go into an infinite
   loop
2) Machine checks in kernel functions copying data from user addresses
   send SIGBUS to the user as if the application had consumed the
   poison. But this is wrong. The user should see either an -EFAULT
   error return or a reduced byte count (in the case of write(2)).

Tony Luck (3):
  x86/mce: Change to not send SIGBUS error during copy from user
  x86/mce: Avoid infinite loop for copy from user recovery
  x86/mce: Drop copyin special case for #MC

 arch/x86/kernel/cpu/mce/core.c | 62 ++++++++++++++++++++++++----------
 arch/x86/lib/copy_user_64.S    | 13 -------
 include/linux/sched.h          |  1 +
 3 files changed, 45 insertions(+), 31 deletions(-)

-- 
2.29.2