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Message-ID: <CANn89iLSKJroojadGD2hvec8EyeUA5TPMKd=PmBzCJ7h2HF0zA@mail.gmail.com>
Date: Wed, 18 Oct 2023 09:36:25 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: gus Gusenleitner Klaus <gus@...a.com>,
Noah Goldstein <goldstein.w.n@...il.com>
Cc: lkml <linux-kernel@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, "bp@...en8.de" <bp@...en8.de>,
"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
"x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
"David S. Miller" <davem@...emloft.net>,
"dsahern@...nel.org" <dsahern@...nel.org>,
"kuba@...nel.org" <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH] amd64: Fix csum_partial_copy_generic()
On Wed, Oct 18, 2023 at 8:18 AM gus Gusenleitner Klaus <gus@...a.com> wrote:
>
> The checksum calculation is wrong in case of an source buffer
> containing zero bytes only. The expected return value is 0, the
> actual return value is 0xfffffff.
>
> This problem occurs when a ICMP echo reply is sent that has set
> zero identifier, sequence number and data.
>
> Signed-off-by: Klaus Gusenleitner <gus@...a.com>
> ---
> arch/x86/lib/csum-copy_64.S | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/lib/csum-copy_64.S b/arch/x86/lib/csum-copy_64.S
> index d9e16a2cf285..c8391b4f3dea 100644
> --- a/arch/x86/lib/csum-copy_64.S
> +++ b/arch/x86/lib/csum-copy_64.S
> @@ -44,7 +44,7 @@ SYM_FUNC_START()
> movq %r13, 3*8(%rsp)
> movq %r15, 4*8(%rsp)
>
> - movl $-1, %eax
> + movl $0, %eax
> xorl %r9d, %r9d
> movl %edx, %ecx
> cmpl $8, %ecx
> --
> 2.30.2
>
Lets CC Noah Goldstein <goldstein.w.n@...il.com> (I thought Noah wrote
some kunit tests, maybe I am wrong)
When was this bug added ?
A Fixes: tag is very much needed, and would be a needed step to CC the
original author.
Thanks.
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