From: aryabinin@virtuozzo.com (Andrey Ryabinin)
To: linux-arm-kernel@lists.infradead.org
Subject: KASAN issues with idle / hotplug area
Date: Thu, 18 Feb 2016 14:45:31 +0300 [thread overview]
Message-ID: <56C5AEDB.1070507@virtuozzo.com> (raw)
In-Reply-To: <20160218093938.GB12476@red-moon>
On 02/18/2016 12:39 PM, Lorenzo Pieralisi wrote:
> On Thu, Feb 18, 2016 at 11:22:24AM +0300, Andrey Ryabinin wrote:
>
> [...]
>
>>> I also tried using __attribute__((no_sanitize_address)) directly, in
>>> case there was some header issue, but that doesn't seem to be the case.
>>>
>>> I'm using the Linaro 15.08 AArch64 GCC 5.1. Is anyone else able to
>>> confirm whether they see the same? Does the same happen for x86?
>>>
>>
>> Confirming, this happens on every GCC I have (including x86).
>> It seems that 'no_sanitize_address' in gcc removes only memory access checks
>> but it doesn't remove stack redzones.
>> I think this is wrong, e.g. clang removes instrumentation completely. I'll submit a bug.
>>
>> But we need fix this in kernel.
>> I see two options here:
>> * completely disable instrumentation for drivers/firmware/psci.c
>
> We have to have a way to disable instrumentation for functions that
> are used to call into FW and return via different code paths.
>
Unfortunately gcc doesn't allow us to do this yet.
>> * get back to assembly implementation
>
> No, we are certainly not reverting the SMCCC work because Kasan adds
> instrumentation to C functions, that's not even an option.
>
> Is it possible at all to implement a function to remove instrumentation
> for a chunk of memory (ie resetting the shadow memory to a clean slate
> for a range of stack addresses) ?
>
Yes, that's possible. We can tell that function resume SP, it can zero out all shadow for stack bellow that SP.
> Thanks,
> Lorenzo
>
next prev parent reply other threads:[~2016-02-18 11:45 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-01 10:54 [PATCH v5sub1 0/8] arm64: split linear and kernel mappings Ard Biesheuvel
2016-02-01 10:54 ` [PATCH v5sub1 1/8] of/fdt: make memblock minimum physical address arch configurable Ard Biesheuvel
2016-02-01 10:54 ` [PATCH v5sub1 2/8] arm64: add support for ioremap() block mappings Ard Biesheuvel
2016-02-01 14:10 ` Mark Rutland
2016-02-01 14:56 ` Catalin Marinas
2016-02-01 10:54 ` [PATCH v5sub1 3/8] arm64: introduce KIMAGE_VADDR as the virtual base of the kernel region Ard Biesheuvel
2016-02-01 10:54 ` [PATCH v5sub1 4/8] arm64: pgtable: implement static [pte|pmd|pud]_offset variants Ard Biesheuvel
2016-02-01 10:54 ` [PATCH v5sub1 5/8] arm64: decouple early fixmap init from linear mapping Ard Biesheuvel
2016-02-01 10:54 ` [PATCH v5sub1 6/8] arm64: kvm: deal with kernel symbols outside of " Ard Biesheuvel
2016-02-01 10:54 ` [PATCH v5sub1 7/8] arm64: move kernel image to base of vmalloc area Ard Biesheuvel
2016-02-01 12:24 ` Catalin Marinas
2016-02-01 12:27 ` Ard Biesheuvel
2016-02-01 13:41 ` Catalin Marinas
2016-02-01 14:32 ` Mark Rutland
2016-02-12 14:58 ` Catalin Marinas
2016-02-12 15:02 ` Ard Biesheuvel
2016-02-12 15:10 ` Catalin Marinas
2016-02-12 15:17 ` Ard Biesheuvel
2016-02-12 15:26 ` Catalin Marinas
2016-02-12 15:38 ` Sudeep Holla
2016-02-12 16:06 ` Catalin Marinas
2016-02-12 16:44 ` Ard Biesheuvel
2016-02-15 14:28 ` Andrey Ryabinin
2016-02-15 14:35 ` Mark Rutland
2016-02-15 18:59 ` Catalin Marinas
2016-02-16 12:59 ` Andrey Ryabinin
2016-02-16 14:12 ` Mark Rutland
2016-02-16 14:29 ` Mark Rutland
2016-02-16 15:17 ` Ard Biesheuvel
2016-02-16 15:36 ` Andrey Ryabinin
2016-02-16 16:42 ` Mark Rutland
2016-02-17 9:15 ` Andrey Ryabinin
2016-02-17 10:10 ` James Morse
2016-02-17 10:19 ` Catalin Marinas
2016-02-17 10:36 ` Catalin Marinas
2016-02-17 10:18 ` Catalin Marinas
2016-02-17 10:48 ` Mark Rutland
2016-02-17 14:39 ` Mark Rutland
2016-02-17 16:31 ` Andrey Ryabinin
2016-02-17 19:35 ` Mark Rutland
2016-02-17 17:01 ` KASAN issues with idle / hotplug area (was: Re: [PATCH v5sub1 7/8] arm64: move kernel image to base of vmalloc area) Mark Rutland
2016-02-17 17:56 ` Mark Rutland
2016-02-17 19:16 ` Mark Rutland
2016-02-18 8:06 ` Ard Biesheuvel
2016-02-18 8:22 ` KASAN issues with idle / hotplug area Andrey Ryabinin
2016-02-18 8:42 ` Andrey Ryabinin
2016-02-18 9:38 ` Andrey Ryabinin
2016-02-18 11:34 ` Mark Rutland
2016-02-18 9:39 ` Lorenzo Pieralisi
2016-02-18 11:38 ` Mark Rutland
2016-02-18 11:45 ` Andrey Ryabinin [this message]
2016-02-18 11:15 ` Mark Rutland
2016-02-18 11:46 ` Andrey Ryabinin
2016-02-18 12:08 ` Mark Rutland
2016-02-12 17:47 ` [PATCH v5sub1 7/8] arm64: move kernel image to base of vmalloc area James Morse
2016-02-12 18:01 ` Ard Biesheuvel
2016-02-01 10:54 ` [PATCH v5sub1 8/8] arm64: allow kernel Image to be loaded anywhere in physical memory Ard Biesheuvel
2016-02-01 14:50 ` Mark Rutland
2016-02-01 16:28 ` Fu Wei
2016-02-16 8:55 ` Fu Wei
2016-02-01 15:06 ` Catalin Marinas
2016-02-01 15:13 ` Ard Biesheuvel
2016-02-01 16:31 ` Ard Biesheuvel
2016-02-01 17:31 ` Catalin Marinas
2016-02-01 17:57 ` Ard Biesheuvel
2016-02-01 18:02 ` Catalin Marinas
2016-02-01 18:30 ` [PATCH] arm64: move back to generic memblock_enforce_memory_limit() Ard Biesheuvel
2016-02-02 10:19 ` Catalin Marinas
2016-02-02 10:28 ` Ard Biesheuvel
2016-02-02 10:44 ` Catalin Marinas
2016-02-12 19:45 ` [PATCH v5sub1 0/8] arm64: split linear and kernel mappings Matthias Brugger
2016-02-12 19:47 ` Ard Biesheuvel
2016-02-12 20:10 ` Matthias Brugger
2016-02-12 20:37 ` Ard Biesheuvel
2016-02-13 14:28 ` Ard Biesheuvel
2016-02-15 13:29 ` Matthias Brugger
2016-02-15 13:40 ` Will Deacon
2016-02-15 14:58 ` Ard Biesheuvel
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