Messages in this thread Patch in this message |  | | Subject | [PATCH -tip v2 3/3] [BUGFIX] kprobes: Prohibit probing on func_ptr_is_kernel_text | From | Masami Hiramatsu <> | Date | Fri, 01 Nov 2013 11:25:37 +0000 |
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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@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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