[PATCH] ntdll: Initialize USR1 handler XSTATE buffer (valgrind).

[Jacek Caban]

Hi Rémi,

On 08.03.2021 09:14, Rémi Bernon wrote:
> diff --git a/dlls/ntdll/unix/signal_x86_64.c b/dlls/ntdll/unix/signal_x86_64.c
> index 2a030372fb7..d0f3ece266c 100644
> --- a/dlls/ntdll/unix/signal_x86_64.c
> +++ b/dlls/ntdll/unix/signal_x86_64.c
> @@ -2642,6 +2642,7 @@ static void usr1_handler( int signal, siginfo_t *siginfo, void *ucontext )
>           DECLSPEC_ALIGN(64) XSTATE xs;
>           context.c.ContextFlags = CONTEXT_FULL;
>           context_init_xstate( &context.c, &xs );
> +        memset( &xs, 0, offsetof(XSTATE, YmmContext) );
>   
>           NtGetContextThread( GetCurrentThread(), &context.c );
>           wait_suspend( &context.c );


I think that the fix should go to NtGetContextThread. I have a patch for 
that, but it breaks our tests (and extended context tests seem generally 
fragile...). I need another look at that...


Thanks,

Jacek