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From: Borislav Petkov <bp@alien8.de>
To: Tony Luck <tony.luck@intel.com>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	"Andy Lutomirski" <luto@kernel.org>,
	"Aili Yao" <yaoaili@kingsoft.com>,
	"HORIGUCHI NAOYA( 堀口 直也)" <naoya.horiguchi@nec.com>
Subject: Re: [PATCH 4/4] x86/mce: Avoid infinite loop for copy from user recovery
Date: Thu, 8 Apr 2021 15:36:31 +0200	[thread overview]
Message-ID: <20210408133631.GJ10192@zn.tnic> (raw)
In-Reply-To: <20210326000235.370514-5-tony.luck@intel.com>

On Thu, Mar 25, 2021 at 05:02:35PM -0700, Tony Luck wrote:
...
> Expected worst case is two machine checks before moving on (e.g. one user
> access with page faults disabled, then a repeat to the same addrsss with
> page faults enabled). Just in case there is some code that loops forever
> enforce a limit of 10.
> 
> Signed-off-by: Tony Luck <tony.luck@intel.com>
> ---
>  arch/x86/kernel/cpu/mce/core.c | 40 ++++++++++++++++++++++++++--------
>  include/linux/sched.h          |  1 +
>  2 files changed, 32 insertions(+), 9 deletions(-)

What I'm still unclear on, does this new version address that
"mysterious" hang or panic which the validation team triggered or you
haven't checked yet?

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette


  reply	other threads:[~2021-04-08 13:36 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-26  0:02 [RFC 0/4] Fix machine check recovery for copy_from_user Tony Luck
2021-03-26  0:02 ` [PATCH 1/4] x86/mce: Fix copyin code to return -EFAULT on machine check Tony Luck
2021-04-06 19:24   ` Borislav Petkov
2021-03-26  0:02 ` [PATCH 2/4] mce/iter: Check for copyin failure & return error up stack Tony Luck
2021-03-26  0:02 ` [PATCH 3/4] mce/copyin: fix to not SIGBUS when copying from user hits poison Tony Luck
2021-04-07 21:18   ` Borislav Petkov
2021-04-07 21:43     ` Luck, Tony
2021-04-08  8:49       ` Borislav Petkov
2021-04-08 17:08         ` Luck, Tony
2021-04-13 10:07           ` Borislav Petkov
2021-04-13 16:13             ` Luck, Tony
2021-04-14 13:05               ` Borislav Petkov
2021-03-26  0:02 ` [PATCH 4/4] x86/mce: Avoid infinite loop for copy from user recovery Tony Luck
2021-04-08 13:36   ` Borislav Petkov [this message]
2021-04-08 16:06     ` Luck, Tony
2021-04-08  2:13 ` [RFC 0/4] Fix machine check recovery for copy_from_user Aili Yao
2021-04-08 14:39   ` Luck, Tony
2021-04-09  6:49     ` Aili Yao
2021-04-19 21:28 [PATCH 4/4] x86/mce: Avoid infinite loop for copy from user recovery Jue Wang
2021-04-19 21:41 ` Luck, Tony

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