Messages in this thread Patch in this message |  | | Date | Fri, 1 Nov 2013 09:57:31 -0400 | From | Steven Rostedt <> | Subject | Re: [PATCH -tip v2 3/3] [BUGFIX] kprobes: Prohibit probing on func_ptr_is_kernel_text |
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On Fri, 01 Nov 2013 11:25:37 +0000 Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> wrote:
> Prohibit probing on func_ptr_is_kernel_text(). > Since the func_ptr_is_kernel_text() is called from > notifier_call_chain() which is called from int3 handler, > probing it may cause double int3 fault and kernel will > reboot. > > This happenes when the kernel built with CONFIG_DEBUG_NOTIFIERS=y.
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
-- Steve
> > Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de> > Cc: Borislav Petkov <bp@suse.de> > Cc: Ingo Molnar <mingo@kernel.org> > --- > kernel/extable.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/kernel/extable.c b/kernel/extable.c > index 832cb28..022fb25 100644 > --- a/kernel/extable.c > +++ b/kernel/extable.c > @@ -129,7 +129,7 @@ int kernel_text_address(unsigned long addr) > * pointer is part of the kernel text, we need to do some > * special dereferencing first. > */ > -int func_ptr_is_kernel_text(void *ptr) > +int nokprobe func_ptr_is_kernel_text(void *ptr) > { > unsigned long addr; > addr = (unsigned long) dereference_function_descriptor(ptr); >
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