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From: Mark Brown <broonie@kernel.org>
To: "Madhavan T. Venkataraman" <madvenka@linux.microsoft.com>
Cc: mark.rutland@arm.com, jpoimboe@redhat.com, jthierry@redhat.com,
	catalin.marinas@arm.com, will@kernel.org,
	linux-arm-kernel@lists.infradead.org,
	live-patching@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v2 1/4] arm64: Implement infrastructure for stack trace reliability checks
Date: Fri, 9 Apr 2021 12:57:08 +0100	[thread overview]
Message-ID: <20210409115708.GB4499@sirena.org.uk> (raw)
In-Reply-To: <eb905f70-a963-6257-c597-89e008675539@linux.microsoft.com>


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On Thu, Apr 08, 2021 at 06:30:22PM -0500, Madhavan T. Venkataraman wrote:
> On 4/8/21 2:30 PM, Madhavan T. Venkataraman wrote:

> > 1. Create a common section (I will have to come up with an appropriate name) and put
> >    all such functions in that one section.

> > 2. Create one section for each logical type (exception section, ftrace section and
> >    kprobe section) or some such.

> For now, I will start with idea 2. I will create a special section for each class of
> functions (EL1 exception handlers, FTRACE trampolines, KPROBE trampolines). Instead of a
> special functions array, I will implement a special_sections array. The rest of the code
> should just fall into place.

> Let me know if you prefer something different.

It might be safer to start off by just putting all SYM_CODE into a
section then pulling bits we know to be safe out of the section as
needed - we know that anything that's SYM_CODE is doing something
non-standard and needs checking to verify that the unwinder will be
happy with it and I that should cover most if not all of the cases above
as well as anything else we didn't explicitly think of.

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  reply	other threads:[~2021-04-09 11:59 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <705993ccb34a611c75cdae0a8cb1b40f9b218ebd>
2021-04-05 20:43 ` [RFC PATCH v2 0/4] arm64: Implement stack trace reliability checks madvenka
2021-04-05 20:43   ` [RFC PATCH v2 1/4] arm64: Implement infrastructure for " madvenka
2021-04-08 15:15     ` Mark Brown
2021-04-08 17:17     ` Mark Brown
2021-04-08 19:30       ` Madhavan T. Venkataraman
2021-04-08 23:30         ` Madhavan T. Venkataraman
2021-04-09 11:57           ` Mark Brown [this message]
2021-04-05 20:43   ` [RFC PATCH v2 2/4] arm64: Mark a stack trace unreliable if an EL1 exception frame is detected madvenka
2021-04-05 20:43   ` [RFC PATCH v2 3/4] arm64: Detect FTRACE cases that make the stack trace unreliable madvenka
2021-04-08 16:58     ` Mark Brown
2021-04-08 19:23       ` Madhavan T. Venkataraman
2021-04-09 11:31         ` Mark Brown
2021-04-09 14:02           ` Madhavan T. Venkataraman
2021-04-09 12:27     ` Mark Rutland
2021-04-09 17:23       ` Madhavan T. Venkataraman
2021-04-05 20:43   ` [RFC PATCH v2 4/4] arm64: Mark stack trace as unreliable if kretprobed functions are present madvenka
2021-04-09 12:09   ` [RFC PATCH v2 0/4] arm64: Implement stack trace reliability checks Mark Rutland
2021-04-09 17:16     ` Madhavan T. Venkataraman
2021-04-09 21:37     ` Josh Poimboeuf
2021-04-09 22:05       ` Madhavan T. Venkataraman
2021-04-09 22:32         ` Josh Poimboeuf
2021-04-09 22:53           ` Josh Poimboeuf
2021-04-11 17:54             ` Madhavan T. Venkataraman
2021-04-12 16:59           ` Mark Brown
2021-04-13 22:53             ` Josh Poimboeuf
2021-04-14 12:24               ` Mark Brown
2021-04-12 17:36       ` Mark Brown
2021-04-12 19:55         ` Madhavan T. Venkataraman
2021-04-13 11:02           ` Mark Brown
2021-04-14 10:23             ` Madhavan T. Venkataraman
2021-04-14 12:35               ` Mark Brown
2021-04-16 14:43               ` Madhavan T. Venkataraman
2021-04-16 15:36                 ` Mark Brown

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