linux-kernel - Re: [PATCH bpf-next] bpf: Check return from set_memory

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Message-ID: <202402171444.C121486@keescook>
Date: Sat, 17 Feb 2024 14:45:03 -0800
From: Kees Cook <keescook@...omium.org>
To: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: 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@...gle.com>,
	Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"linux-hardening @ vger . kernel . org" <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH bpf-next] bpf: Check return from set_memory_rox() and
 friends

On Sat, Feb 17, 2024 at 11:24:07AM +0100, Christophe Leroy wrote:
> arch_protect_bpf_trampoline() and alloc_new_pack() call
> set_memory_rox() which can fail, leading to unprotected memory.
> 
> Take into account return from set_memory_XX() functions and add
> __must_check flag to arch_protect_bpf_trampoline().
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>

Thanks for doing this! This seems to hit all the right error paths that
I can see.

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook