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Subject[PATCH] arm64: traps: add dump instr before BUG in kernel
Date
From: Chen Lin <chen.lin5@zte.com.cn>

we should dump the real instructions before BUG in kernel mode, and
compare this to the instructions from objdump.

Signed-off-by: Chen Lin <chen.lin5@zte.com.cn>
---
arch/arm64/kernel/traps.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index b03e383..621a9dd 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -495,7 +495,12 @@ void do_undefinstr(struct pt_regs *regs)
if (call_undef_hook(regs) == 0)
return;

- BUG_ON(!user_mode(regs));
+ if (!user_mode(regs)) {
+ pr_emerg("Undef instruction in kernel, dump instr:");
+ dump_kernel_instr(KERN_EMERG, regs);
+ BUG();
+ }
+
force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc, 0);
}
NOKPROBE_SYMBOL(do_undefinstr);
--
1.7.9.5
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