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Subject: Re: [PATCH bpf v4] bpf: Fix theoretical prog_array UAF in
 __uprobe_perf_func()
From: patchwork-bot+netdevbpf@kernel.org
Message-Id: 
 <173386622902.984066.17756652143302232987.git-patchwork-notify@kernel.org>
Date: Tue, 10 Dec 2024 21:30:29 +0000
References: <20241210-bpf-fix-uprobe-uaf-v4-1-5fc8959b2b74@google.com>
In-Reply-To: <20241210-bpf-fix-uprobe-uaf-v4-1-5fc8959b2b74@google.com>
To: Jann Horn <jannh@google.com>
Cc: ast@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com,
 andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org,
 yonghong.song@linux.dev, kpsingh@kernel.org, sdf@fomichev.me,
 haoluo@google.com, jolsa@kernel.org, rostedt@goodmis.org,
 mhiramat@kernel.org, mathieu.desnoyers@efficios.com, delyank@fb.com,
 bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
 linux-trace-kernel@vger.kernel.org

Hello:

This patch was applied to bpf/bpf.git (master)
by Andrii Nakryiko <andrii@kernel.org>:

On Tue, 10 Dec 2024 20:08:14 +0100 you wrote:
> Currently, the pointer stored in call->prog_array is loaded in
> __uprobe_perf_func(), with no RCU annotation and no immediately visible
> RCU protection, so it looks as if the loaded pointer can immediately be
> dangling.
> Later, bpf_prog_run_array_uprobe() starts a RCU-trace read-side critical
> section, but this is too late. It then uses rcu_dereference_check(), but
> this use of rcu_dereference_check() does not actually dereference anything.
> 
> [...]

Here is the summary with links:
  - [bpf,v4] bpf: Fix theoretical prog_array UAF in __uprobe_perf_func()
    https://git.kernel.org/bpf/bpf/c/7d0d673627e2

You are awesome, thank you!
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