[PATCH] riscv: signal: fix sigaltstack frame size checking

[Linux regression tracking (Thorsten Leemhuis)]

On 31.08.23 23:58, Palmer Dabbelt wrote:
> 
> On Tue, 22 Aug 2023 16:49:03 +0000, Andy Chiu wrote:
>> The alternative stack checking in get_sigframe introduced by the Vector
>> support is not needed and has a problem. It is not needed as we have
>> already validate it at the beginning of the function if we are already
>> on an altstack. If not, the size of an altstack is always validated at
>> its allocation stage with sigaltstack_size_valid().
>>
>> Besides, we must only regard the size of an altstack if the handler of a
>> signal is registered with SA_ONSTACK. So, blindly checking overflow of
>> an altstack if sas_ss_size not equals to zero will check against wrong
>> signal handlers if only a subset of signals are registered with
>> SA_ONSTACK.
>>
>> [...]
> 
> Applied, thanks!
> 
> [1/1] riscv: signal: fix sigaltstack frame size checking
>       https://git.kernel.org/palmer/c/d77303a57c95

Just wondering: what happened to this patch, which afaics is currently
in neither mainline nor next? Because according to
https://bugzilla.kernel.org/show_bug.cgi?id=217923 it fixes rustc
userspace crashes with 6.5. Was a different approach found?

Ciao, Thorsten