linux-kernel - Re: BUG: KASAN: use-after-free in dec_rlimit

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Message-ID: <YaBxzDGyWxU/836N@fixkernel.com>
Date:   Fri, 26 Nov 2021 00:34:04 -0500
From:   Qian Cai <quic_qiancai@...cinc.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
CC:     Alexey Gladkov <legion@...nel.org>, Yu Zhao <yuzhao@...gle.com>,
        <linux-kernel@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: BUG: KASAN: use-after-free in dec_rlimit_ucounts

On Wed, Nov 24, 2021 at 04:49:19PM -0500, Qian Cai wrote:
> Hmm, I don't know if that or it is just this platfrom is lucky to trigger
> the race condition quickly, but I can't reproduce it on x86 so far. I am
> Cc'ing a few arm64 people to see if they have spot anything I might be
> missing. The original bug report is here:
> 
> https://lore.kernel.org/lkml/YZV7Z+yXbsx9p3JN@fixkernel.com/

Okay, I am finally able to reproduce this on x86_64 with the latest
mainline as well by setting CONFIG_USER_NS and KASAN on the top of
defconfig (I did not realize it did not select CONFIG_USER_NS in the first
place). Anyway, it still took less than 5-minute by running:

$ trinity -C 48