From: Rik van Riel <riel@surriel.com>
To: Andy Lutomirski <luto@kernel.org>,
x86@kernel.org, Nadav Amit <nadav.amit@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>, Jann Horn <jannh@google.com>,
LKML <linux-kernel@vger.kernel.org>,
stable@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH v2] x86/nmi: Fix some races in NMI uaccess
Date: Wed, 29 Aug 2018 12:06:54 -0400 [thread overview]
Message-ID: <9ff9dd41ff99560dcb3eb78f5835da67293f860c.camel@surriel.com> (raw)
In-Reply-To: <dd956eba16646fd0b15c3c0741269dfd84452dac.1535557289.git.luto@kernel.org>
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On Wed, 2018-08-29 at 08:47 -0700, Andy Lutomirski wrote:
> In NMI context, we might be in the middle of context switching or in
> the middle of switch_mm_irqs_off(). In either case, CR3 might not
> match current->mm, which could cause copy_from_user_nmi() and
> friends to read the wrong memory.
>
> Fix it by adding a new nmi_uaccess_okay() helper and checking it in
> copy_from_user_nmi() and in __copy_from_user_nmi()'s callers.
>
> Cc: stable@vger.kernel.org
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Nadav Amit <nadav.amit@gmail.com>
> Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Rik van Riel <riel@surriel.com>
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next prev parent reply other threads:[~2018-08-29 16:06 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-29 15:47 [PATCH v2] x86/nmi: Fix some races in NMI uaccess Andy Lutomirski
2018-08-29 16:06 ` Rik van Riel [this message]
2018-08-29 18:56 ` Nadav Amit
2018-08-30 13:36 ` Thomas Gleixner
2018-08-30 14:21 ` Andy Lutomirski
2018-08-30 14:27 ` Thomas Gleixner
2018-08-30 14:39 ` [tip:x86/urgent] x86/nmi: Fix NMI uaccess race against CR3 switching tip-bot for Andy Lutomirski
2018-08-31 15:13 ` tip-bot for Andy Lutomirski
-- strict thread matches above, loose matches on Subject: below --
2018-08-27 23:04 [PATCH] x86/nmi: Fix some races in NMI uaccess Andy Lutomirski
2018-08-28 17:56 ` [PATCH v2] " Rik van Riel
2018-08-29 3:46 ` Andy Lutomirski
2018-08-29 15:17 ` Rik van Riel
2018-08-29 15:36 ` Andy Lutomirski
2018-08-29 15:49 ` Rik van Riel
2018-08-29 16:14 ` Andy Lutomirski
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