linux-kernel - Re: [PATCH -v2] powerpc/process, kasan: Silence KASAN warnings in __get

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Message-Id: <165478587162.589231.6430852932301326942.b4-ty@ellerman.id.au>
Date:   Fri, 10 Jun 2022 00:44:31 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     catalin.marinas@....com, keescook@...omium.org, mpe@...erman.id.au,
        He Ying <heying24@...wei.com>, npiggin@...il.com,
        peterz@...radead.org, christophe.leroy@...roup.eu,
        benh@...nel.crashing.org, paulus@...ba.org, sxwjean@...il.com
Cc:     linuxppc-dev@...ts.ozlabs.org, chenjingwen6@...wei.com,
        huwanming@...weil.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -v2] powerpc/process, kasan: Silence KASAN warnings in __get_wchan()

On Thu, 20 Jan 2022 20:44:18 -0500, He Ying wrote:
> The following KASAN warning was reported in our kernel.
> 
>   BUG: KASAN: stack-out-of-bounds in get_wchan+0x188/0x250
>   Read of size 4 at addr d216f958 by task ps/14437
> 
>   CPU: 3 PID: 14437 Comm: ps Tainted: G           O      5.10.0 #1
>   Call Trace:
>   [daa63858] [c0654348] dump_stack+0x9c/0xe4 (unreliable)
>   [daa63888] [c035cf0c] print_address_description.constprop.3+0x8c/0x570
>   [daa63908] [c035d6bc] kasan_report+0x1ac/0x218
>   [daa63948] [c00496e8] get_wchan+0x188/0x250
>   [daa63978] [c0461ec8] do_task_stat+0xce8/0xe60
>   [daa63b98] [c0455ac8] proc_single_show+0x98/0x170
>   [daa63bc8] [c03cab8c] seq_read_iter+0x1ec/0x900
>   [daa63c38] [c03cb47c] seq_read+0x1dc/0x290
>   [daa63d68] [c037fc94] vfs_read+0x164/0x510
>   [daa63ea8] [c03808e4] ksys_read+0x144/0x1d0
>   [daa63f38] [c005b1dc] ret_from_syscall+0x0/0x38
>   --- interrupt: c00 at 0x8fa8f4
>       LR = 0x8fa8cc
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc/process, kasan: Silence KASAN warnings in __get_wchan()
      https://git.kernel.org/powerpc/c/a1b29ba2f2c171b9bea73be993bfdf0a62d37d15

cheers