linux-kernel - Re: [PATCH bpf-next v4 2/2] bpftool: Fix UAF in get_delegate

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Message-ID: <be97c55b-a7ae-471b-8113-0c936634110f@kernel.org>
Date: Fri, 19 Sep 2025 09:56:59 +0100
From: Quentin Monnet <qmo@...nel.org>
To: Tao Chen <chen.dylane@...ux.dev>, ast@...nel.org, daniel@...earbox.net,
 andrii@...nel.org, martin.lau@...ux.dev, eddyz87@...il.com, song@...nel.org,
 yonghong.song@...ux.dev, john.fastabend@...il.com, kpsingh@...nel.org,
 sdf@...ichev.me, haoluo@...gle.com, jolsa@...nel.org
Cc: bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v4 2/2] bpftool: Fix UAF in get_delegate_value

2025-09-19 11:48 UTC+0800 ~ Tao Chen <chen.dylane@...ux.dev>
> The return value ret pointer is pointing opts_copy, but opts_copy
> gets freed in get_delegate_value before return, fix this by free
> the mntent->mnt_opts strdup memory after show delegate value.
> 
> Fixes: 2d812311c2b2 ("bpftool: Add bpf_token show")
> Signed-off-by: Tao Chen <chen.dylane@...ux.dev>


Reviewed-by: Quentin Monnet <qmo@...nel.org>

Thank you!