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Date:   Mon, 13 Nov 2023 19:03:43 -0500
From:   Andrei Matei <>
To:     Hao Sun <>
Cc:     Alexei Starovoitov <>,
        Daniel Borkmann <>,
        John Fastabend <>,
        Andrii Nakryiko <>,
        Martin KaFai Lau <>,
        Song Liu <>,
        Yonghong Song <>,
        KP Singh <>,
        Stanislav Fomichev <>,
        Jiri Olsa <>, bpf <>,
        Linux Kernel Mailing List <>
Subject: Re: bpf: incorrect stack_depth after var off stack access causes OOB

I have sent
as a fix.

Hao, thanks again for the report. For my edification, how did you get
the KASAN bug report with your repro / which tree exactly were you
running against and with what config? I've run your repro program in
the VM created by, with an added CONFIG_KASAN=y in the
config, and I did not get the bug report in dmesg; I got nothing.
However, if I change the variable offset bounds to be around 200 bytes
instead of 12, then I do get a kernel panic because of a page fault.

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