linux-kernel - Re: [PATCH] bpf: Fix UAF via mismatching bpf

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Message-Id: 
 <173385543176.937529.2200344298659513715.git-patchwork-notify@kernel.org>
Date: Tue, 10 Dec 2024 18:30:31 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Jann Horn <jannh@...gle.com>
Cc: song@...nel.org, jolsa@...nel.org, kpsingh@...nel.org,
 mattbobrowski@...gle.com, ast@...nel.org, daniel@...earbox.net,
 andrii@...nel.org, martin.lau@...ux.dev, eddyz87@...il.com,
 yonghong.song@...ux.dev, john.fastabend@...il.com, sdf@...ichev.me,
 haoluo@...gle.com, rostedt@...dmis.org, mhiramat@...nel.org,
 mathieu.desnoyers@...icios.com, delyank@...com, bpf@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 stable@...r.kernel.org
Subject: Re: [PATCH] bpf: Fix UAF via mismatching bpf_prog/attachment RCU
 flavors

Hello:

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

On Tue, 10 Dec 2024 17:32:13 +0100 you wrote:
> Uprobes always use bpf_prog_run_array_uprobe() under tasks-trace-RCU
> protection. But it is possible to attach a non-sleepable BPF program to a
> uprobe, and non-sleepable BPF programs are freed via normal RCU (see
> __bpf_prog_put_noref()). This leads to UAF of the bpf_prog because a normal
> RCU grace period does not imply a tasks-trace-RCU grace period.
> 
> Fix it by explicitly waiting for a tasks-trace-RCU grace period after
> removing the attachment of a bpf_prog to a perf_event.
> 
> [...]

Here is the summary with links:
  - bpf: Fix UAF via mismatching bpf_prog/attachment RCU flavors
    https://git.kernel.org/bpf/bpf/c/ef1b808e3b7c

You are awesome, thank you!
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