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From: Miroslav Benes <mbenes@suse.cz>
To: Mark Brown <broonie@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC PATCH 3/3] arm64: stacktrace: Implement reliable stacktrace
Date: Thu, 15 Oct 2020 15:33:44 +0200 (CEST)	[thread overview]
Message-ID: <alpine.LSU.2.21.2010151530060.14094@pobox.suse.cz> (raw)
In-Reply-To: <20201012172605.10715-4-broonie@kernel.org>

On Mon, 12 Oct 2020, Mark Brown wrote:

> +int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry,
> +			     void *cookie, struct task_struct *task)
> +{
> +	struct stackframe frame;
> +
> +	if (task == current)
> +		start_backtrace(&frame,
> +				(unsigned long)__builtin_frame_address(0),
> +				(unsigned long)arch_stack_walk_reliable);
> +	else
> +		start_backtrace(&frame, thread_saved_fp(task),
> +				thread_saved_pc(task));
> +
> +	while (1) {
> +		int ret;
> +
> +#ifdef CONFIG_KPROBES
> +		/*
> +		 * Mark stacktraces with kretprobed functions on them
> +		 * as unreliable.
> +		 */
> +		if (frame.pc == (unsigned long)kretprobe_trampoline)
> +			return -EINVAL;
> +#endif

I think it would be nice to check if frame.pc is a valid text address here
before it is consumed next.

> +		if (!consume_entry(cookie, frame.pc))
> +			return -EINVAL;
> +		ret = unwind_frame(task, &frame);
> +		if (ret == -ENOENT)
> +			return 0;
> +		if (ret < 0)
> +			return ret;
> +	}
> +}

Miroslav

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  parent reply	other threads:[~2020-10-15 13:35 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-12 17:26 [RFC PATCH 0/3] arm64: Implement reliable stack trace Mark Brown
2020-10-12 17:26 ` [RFC PATCH 1/3] arm64: remove EL0 exception frame record Mark Brown
2020-10-12 17:26 ` [RFC PATCH 2/3] arm64: stacktrace: Report when we reach the end of the stack Mark Brown
2020-10-13 11:07   ` Mark Rutland
2020-10-12 17:26 ` [RFC PATCH 3/3] arm64: stacktrace: Implement reliable stacktrace Mark Brown
2020-10-13 10:42   ` Mark Brown
2020-10-13 11:42   ` Mark Rutland
2020-10-13 16:12     ` Mark Brown
2020-10-15 13:33   ` Miroslav Benes [this message]
2020-10-15 15:57     ` Mark Brown
2020-10-16 10:13       ` Miroslav Benes
2020-10-16 12:30         ` Mark Brown
2020-10-15 13:39 ` [RFC PATCH 0/3] arm64: Implement reliable stack trace Miroslav Benes
2020-10-15 14:16   ` Mark Rutland
2020-10-15 15:49     ` Mark Brown
2020-10-15 21:29       ` Josh Poimboeuf
2020-10-16 11:14         ` Mark Rutland
2020-10-20 10:03           ` Mark Rutland
2020-10-20 15:58             ` Josh Poimboeuf
2020-10-16 12:15         ` Mark Brown
2020-10-19 23:41           ` Josh Poimboeuf
2020-10-20 15:39             ` Mark Brown
2020-10-20 16:28               ` Josh Poimboeuf
2021-01-27 14:02 ` Madhavan T. Venkataraman
2021-01-27 16:40   ` Mark Rutland
2021-01-27 17:11     ` Mark Brown
2021-01-27 17:24   ` Madhavan T. Venkataraman
2021-01-27 19:54 ` Madhavan T. Venkataraman
2021-01-28 14:22   ` Mark Brown
2021-01-28 15:26     ` Josh Poimboeuf
2021-01-29 21:39       ` Madhavan T. Venkataraman
2021-02-01  3:20         ` Madhavan T. Venkataraman
2021-02-01 14:39         ` Mark Brown
2021-01-30  4:38       ` Madhavan T. Venkataraman
2021-02-01 15:21       ` Madhavan T. Venkataraman
2021-02-01 15:46         ` Madhavan T. Venkataraman
2021-02-01 16:02         ` Mark Rutland
2021-02-01 16:22           ` Mark Brown
2021-02-01 21:40             ` Madhavan T. Venkataraman
2021-02-01 21:38           ` Madhavan T. Venkataraman
2021-02-01 23:00             ` Josh Poimboeuf
2021-02-02  2:29               ` Madhavan T. Venkataraman
2021-02-02  3:36                 ` Josh Poimboeuf
2021-02-02 10:05             ` Mark Rutland
2021-02-02 13:33               ` Madhavan T. Venkataraman
2021-02-02 13:35               ` Madhavan T. Venkataraman
2021-02-02 23:32               ` Madhavan T. Venkataraman
2021-02-03 16:53                 ` Mark Rutland
2021-02-03 19:03                   ` Madhavan T. Venkataraman
2021-02-05  2:36                     ` Madhavan T. Venkataraman
2021-02-01 21:59     ` Madhavan T. Venkataraman
2021-02-02 13:36       ` Mark Brown

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