linux-kernel - Re: [PATCH bpf-next] libbpf: poison strlcpy()

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Y7cbM1D2YvB9tdqg@google.com>
Date:   Thu, 5 Jan 2023 10:47:15 -0800
From:   sdf@...gle.com
To:     Rong Tao <rtoax@...mail.com>
Cc:     andrii@...nel.org, rongtao@...tc.cn,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Hao Luo <haoluo@...gle.com>,
        Jiri Olsa <jolsa@...nel.org>,
        "open list:BPF [LIBRARY] (libbpf)" <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next] libbpf: poison strlcpy()

On 01/05, Rong Tao wrote:
> From: Rong Tao <rongtao@...tc.cn>

> Since commit 9fc205b413b3("libbpf: Add sane strncpy alternative and use
> it internally") introduce libbpf_strlcpy(), thus add strlcpy() to a poison
> list to prevent accidental use of it.

> Signed-off-by: Rong Tao <rongtao@...tc.cn>

Acked-by: Stanislav Fomichev <sdf@...gle.com>

> ---
>   tools/lib/bpf/libbpf_internal.h | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)

> diff --git a/tools/lib/bpf/libbpf_internal.h  
> b/tools/lib/bpf/libbpf_internal.h
> index 377642ff51fc..2d26ded383ca 100644
> --- a/tools/lib/bpf/libbpf_internal.h
> +++ b/tools/lib/bpf/libbpf_internal.h
> @@ -20,8 +20,8 @@
>   /* make sure libbpf doesn't use kernel-only integer typedefs */
>   #pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64

> -/* prevent accidental re-addition of reallocarray() */
> -#pragma GCC poison reallocarray
> +/* prevent accidental re-addition of reallocarray()/strlcpy() */
> +#pragma GCC poison reallocarray strlcpy

>   #include "libbpf.h"
>   #include "btf.h"
> --
> 2.39.0