linux-kernel - Re: [PATCH 1/4] [BUGFIX] ftrace/kprobes: Fix not to delete probes if in use

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 08 Oct 2011 01:00:04 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	yrl.pp-manager.tt@...achi.com,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>
Subject: Re: [PATCH 1/4] [BUGFIX] ftrace/kprobes: Fix not to delete probes
 if in use

On Tue, 2011-10-04 at 19:44 +0900, Masami Hiramatsu wrote:
> Fix kprobe-tracer not to delete a probe if the probe is in use.
> In that case, delete operation will return -EBUSY.
> 
> This bug can cause a kernel panic if enabled probes are deleted
> during perf record.
> 
> (Add some probes on functions)
> # perf record -e probe:\* -aR sh
> sh-4.2# perf probe --del probe:\*
> sh-4.2# exit
> (kernel panic)


Hi Masami,

I was able to reproduce the panic. I'm currently running patch 1 and 4
through my standard tests before pushing this out as urgent.

Does this exist in previous kernels? If so, I'll also add the stable tag
to it.

Could you resend the trivial patches when you make your necessary
corrections. They are not important as these are and I'll add them to a
separate queue.

Thanks!

-- Steve


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/