Prohibit probing on func_ptr_is_kernel_text() by adding
it to the kprobe_blacklist.
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...@hitachi.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: "Uwe Kleine-König" <u.kleine-koe...@pengutronix.de>
Cc: Borislav Petkov <b...@suse.de>
Cc: Ingo Molnar <mi...@kernel.org>
---
kernel/extable.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/extable.c b/kernel/extable.c
index 832cb28..885c877 100644
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -20,6 +20,7 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/init.h>
+#include <linux/kprobes.h>
#include <asm/sections.h>
#include <asm/uaccess.h>
@@ -137,3 +138,4 @@ int func_ptr_is_kernel_text(void *ptr)
return 1;
return is_module_text_address(addr);
}
+NOKPROBE_SYMBOL(func_ptr_is_kernel_text);
--
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