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

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Message-ID: <YZenam0jzQIlyIew@fixkernel.com>
Date:   Fri, 19 Nov 2021 08:32:26 -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>
Subject: Re: BUG: KASAN: use-after-free in dec_rlimit_ucounts

On Thu, Nov 18, 2021 at 02:57:17PM -0600, Eric W. Biederman wrote:
> Does this only happen on a single architecture?  If so I wonder if
> perhaps some of the architectures atomic primitives are implemented
> improperly.

No, I just don't have another arch to test this on, and I see no reason
that it won't be reproduced on x86. If arm64 atomic primitives are
problematic, it will likely blow up elsewhere which is not the case from
our daily CI regression testing running for many years.