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Date: Fri, 01 Nov 2013 11:25:37 +0000 From: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> To: Ingo Molnar <mingo@...nel.org> Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>, x86@...nel.org, lkml <linux-kernel@...r.kernel.org>, "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>, Uwe Kleine-König <u.kleine-koenig@...gutronix.de>, Andrew Morton <akpm@...ux-foundation.org>, Borislav Petkov <bp@...e.de> Subject: [PATCH -tip v2 3/3] [BUGFIX] kprobes: Prohibit probing on func_ptr_is_kernel_text 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. Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> Cc: Andrew Morton <akpm@...ux-foundation.org> Cc: "Uwe Kleine-König" <u.kleine-koenig@...gutronix.de> Cc: Borislav Petkov <bp@...e.de> Cc: Ingo Molnar <mingo@...nel.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); -- 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/
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