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Re: [PATCH v3 0/3] Add stack protector
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Date: Thu, 12 Dec 2024 00:13:33 +0000
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 12 Dec 2024 00:13:48 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHbS3EDPfnUwIrgWUmXfq3bo38udA==
- Thread-topic: [PATCH v3 0/3] Add stack protector
Hello Jan,
Jan Beulich <jbeulich@xxxxxxxx> writes:
> On 11.12.2024 03:04, Volodymyr Babchuk wrote:
>> Both GCC and Clang support -fstack-protector feature, which add stack
>> canaries to functions where stack corruption is possible. This series
>> makes possible to use this feature in Xen. I tested this on ARM64 and
>> it is working as intended. Tested both with GCC and Clang.
>>
>> It is hard to enable this feature on x86, as GCC stores stack canary
>> in %fs:40 by default, but Xen can't use %fs for various reasons. It is
>> possibly to change stack canary location new newer GCC versions, but
>> this will change minimal GCC requirement, which is also hard due to
>> various reasons. So, this series focus mostly on ARM and RISCV.
>
> Why exactly would it not be possible to offer the feature when new enough
> gcc is in use?
It is possible to use this feature with a modern enough GCC, yes. Are
you suggesting to make HAS_STACK_PROTECTOR dependent on GCC_VERSION for
x86 platform?
--
WBR, Volodymyr
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