Re: [PATCH v13 01/12] kprobes: Protect kprobe_blacklist with RCU

[sashiko-bot@kernel.org]

> From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
> 
> __within_kprobe_blacklist() traverses kprobe_blacklist without holding
> kprobe_mutex. When a module is unloaded, kprobe_remove_area_blacklist()
> removes blacklist entries and immediately frees them with kfree().
> A concurrent call to within_kprobe_blacklist() can therefore dereference
> freed memory.
> 
> Furthermore, within_kprobe_blacklist() can be called in atomic or
> non-preemptible contexts where the sleeping kprobe_mutex cannot be taken.
> 
> Protect kprobe_blacklist with RCU. Use guard(rcu)() and
> list_for_each_entry_rcu() for traversal, list_add_tail_rcu() for
> insertions, list_del_rcu() for deletions, and kfree_rcu() to reclaim
> entries safely after a grace period.
> 
> Assisted-by: Antigravity:gemini-3.7-flash
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

Sashiko has reviewed this patch and found no issues. It looks great!

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