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) [off-list ref]:

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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