arm64: force_signal_inject: WARN if called from kernel context (8a60419d) · Commits · 戴 / test

force_signal_inject() is designed to send a fatal signal to userspace, so WARN if the current pt_regs indicates a kernel context. This can currently happen for the undefined instruction trap, so patch that up so we always BUG() if we didn't have a handler. Signed-off-by:

Will Deacon <will.deacon@arm.com> Signed-off-by:

Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/kernel/traps.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -354,6 +354,9 @@ void force_signal_inject(int signal, int code, unsigned long address)
		const char *desc;
		struct pt_regs *regs = current_pt_regs();

		if (WARN_ON(!user_mode(regs)))
		return;

		clear_siginfo(&info);

		switch (signal) {
		@@ -408,8 +411,8 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
		if (call_undef_hook(regs) == 0)
		return;

		force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc);
		BUG_ON(!user_mode(regs));
		force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc);
		}

		#define __user_cache_maint(insn, address, res) \

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