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Re: [PATCH -tip v3 00/23] kprobes: introduce NOKPROBE_SYMBOL() and general cleaning of kprobe blacklist
- From: Ingo Molnar <mingo at kernel dot org>
- To: "Frank Ch. Eigler" <fche at redhat dot com>
- Cc: Masami Hiramatsu <masami dot hiramatsu dot pt at hitachi dot com>, linux-arch at vger dot kernel dot org, Ananth N Mavinakayanahalli <ananth at in dot ibm dot com>, Sandeepa Prabhu <sandeepa dot prabhu at linaro dot org>, x86 at kernel dot org, lkml <linux-kernel at vger dot kernel dot org>, "Steven Rostedt (Red Hat)" <rostedt at goodmis dot org>, virtualization at lists dot linux-foundation dot org, systemtap at sourceware dot org, "David S. Miller" <davem at davemloft dot net>
- Date: Wed, 20 Nov 2013 16:38:01 +0100
- Subject: Re: [PATCH -tip v3 00/23] kprobes: introduce NOKPROBE_SYMBOL() and general cleaning of kprobe blacklist
- Authentication-results: sourceware.org; auth=none
- References: <20131120042148 dot 15296 dot 88360 dot stgit at kbuild-fedora dot novalocal> <y0mvbznxi6k dot fsf at fche dot csb>
* Frank Ch. Eigler <fche@redhat.com> wrote:
> masami.hiramatsu.pt wrote:
>
> > [...] This series also includes a change which prohibits probing
> > on the address in .entry.text because the code is used for very
> > low-level sensitive interrupt/syscall entries. Probing such code
> > may cause unexpected result (actually most of that area is already
> > in the kprobe blacklist). So I've decide to prohibit probing all
> > of them. [...]
>
> Does this new blacklist cover enough that the kernel now survives a
> broadly wildcarded perf-probe, e.g. over e.g. all of its kallsyms?
That's generally the purpose of the annotations - if it doesn't then
that's a bug.
Thanks,
Ingo