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Re: [PATCH 5/5] x86/tboot: actually wipe contexts
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
- Date: Fri, 9 Dec 2022 21:53:37 +0000
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- Thread-topic: [PATCH 5/5] x86/tboot: actually wipe contexts
On 06/12/2022 13:57, Jan Beulich wrote:
> Especially with our use of __builtin_memset() to implement memset() the
> compiler is free to eliminate instances when it can prove that the
> affected object is dead. Introduce a small helper function accompanying
> the memset() with a construct forcing the compiler to retain the
> clearing of (stack) memory.
>
> Fixes: c021c95498d9 ("x86: Replace our own specialised versions of memset and
> memcpy with")
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Thanks. I'd noticed this before wanted to do something about it.
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
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