Re: [PATCH v18 5/5] x86: vdso: Wire up getrandom() vDSO implementation

Thomas Gleixner
2024-06-28T13:57:48Z

On Thu, Jun 20 2024 at 02:53, Jason A. Donenfeld wrote:
> Hook up the generic vDSO implementation to the x86 vDSO data page. Since
> the existing vDSO infrastructure is heavily based on the timekeeping
> functionality, which works over arrays of bases, a new macro is
> introduced for vvars that are not arrays.
>
> The vDSO function requires a ChaCha20 implementation that does not write
> to the stack, yet can still do an entire ChaCha20 permutation, so
> provide this using SSE2, since this is userland code that must work on
> all x86-64 processors. There's a simple test for this code as well.
>
> Reviewed-by: Samuel Neves <sneves@dei.uc.pt> # for vgetrandom-chacha.S
> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>