linux-kernel - Re: [PATCH v3] kprobe/ftrace: bail out if ftrace was killed

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Date: Wed, 22 May 2024 23:32:23 +0000
From: patchwork-bot+linux-riscv@...nel.org
To: Stephen Brennan <stephen.s.brennan@...cle.com>
Cc: linux-riscv@...ts.infradead.org, rostedt@...dmis.org, mhiramat@...nel.org,
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Subject: Re: [PATCH v3] kprobe/ftrace: bail out if ftrace was killed

Hello:

This patch was applied to riscv/linux.git (fixes)
by Masami Hiramatsu (Google) <mhiramat@...nel.org>:

On Wed,  1 May 2024 09:29:56 -0700 you wrote:
> If an error happens in ftrace, ftrace_kill() will prevent disarming
> kprobes. Eventually, the ftrace_ops associated with the kprobes will be
> freed, yet the kprobes will still be active, and when triggered, they
> will use the freed memory, likely resulting in a page fault and panic.
> 
> This behavior can be reproduced quite easily, by creating a kprobe and
> then triggering a ftrace_kill(). For simplicity, we can simulate an
> ftrace error with a kernel module like [1]:
> 
> [...]

Here is the summary with links:
  - [v3] kprobe/ftrace: bail out if ftrace was killed
    https://git.kernel.org/riscv/c/1a7d0890dd4a

You are awesome, thank you!
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