linux-kernel - Re: [PATCH bpf-next 02/11] bpf: Return -EFAULT on misconfigurations

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Message-ID: <785b4531ce3b44a84059a4feb4ba458c68fce719.camel@gmail.com>
Date: Sat, 15 Mar 2025 01:06:05 -0700
From: Eduard Zingerman <eddyz87@...il.com>
To: Luis Gerhorst <luis.gerhorst@....de>, Alexei Starovoitov
 <ast@...nel.org>,  Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko
 <andrii@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>,  Song Liu
 <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>, John Fastabend	
 <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>, Stanislav
 Fomichev	 <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>, Jiri Olsa
 <jolsa@...nel.org>,  Puranjay Mohan <puranjay@...nel.org>, Xu Kuohai
 <xukuohai@...weicloud.com>, Catalin Marinas	 <catalin.marinas@....com>,
 Will Deacon <will@...nel.org>, Hari Bathini	 <hbathini@...ux.ibm.com>,
 Christophe Leroy <christophe.leroy@...roup.eu>,  Naveen N Rao
 <naveen@...nel.org>, Madhavan Srinivasan <maddy@...ux.ibm.com>, Michael
 Ellerman	 <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, Mykola
 Lysenko	 <mykolal@...com>, Shuah Khan <shuah@...nel.org>, Henriette Herzog	
 <henriette.herzog@....de>, Cupertino Miranda
 <cupertino.miranda@...cle.com>,  Matan Shachnai <m.shachnai@...il.com>,
 Dimitar Kanaliev <dimitar.kanaliev@...eground.com>, Shung-Hsi Yu	
 <shung-hsi.yu@...e.com>, Daniel Xu <dxu@...uu.xyz>, bpf@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linuxppc-dev@...ts.ozlabs.org, linux-kselftest@...r.kernel.org, George Guo	
 <guodongtai@...inos.cn>, WANG Xuerui <git@...0n.name>, Tiezhu Yang	
 <yangtiezhu@...ngson.cn>
Cc: Maximilian Ott <ott@...fau.de>, Milan Stephan <milan.stephan@....de>
Subject: Re: [PATCH bpf-next 02/11] bpf: Return -EFAULT on misconfigurations

On Thu, 2025-03-13 at 18:21 +0100, Luis Gerhorst wrote:
> Mark these cases as non-recoverable to later prevent them from being
> cought when they occur during speculative path verification.
> 
> Signed-off-by: Luis Gerhorst <luis.gerhorst@....de>
> Acked-by: Henriette Herzog <henriette.herzog@....de>
> Cc: Maximilian Ott <ott@...fau.de>
> Cc: Milan Stephan <milan.stephan@....de>
> ---

The only pace I'm aware of that might act upon specific error code
from verifier syscall is libbpf. Looking through libbpf code, it seems
that this change does not interfere with libbpf.

Reviewed-by: Eduard Zingerman <eddyz87@...il.com>

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