On Fri, 19 Apr 2024, H.J. Lu wrote:
> On Fri, Apr 19, 2024 at 7:08 AM Mikulas Patocka <[email protected]> wrote: > > > > I'd like to ask what to do with it? We could use LD_BIND_NOW=1 (or > > -Wl,-z,now) - it mostly works, but not entirely - the key may still be > > present on the stack even if we use LD_BIND_NOW=1. > > Since vector registers are saved on stack only during symbol lookup, > shouldn't disabling lazy binding solve this issue? It should, but it doesn't fix this problem entirely. If I set "GLIBC_TUNABLES=glibc.cpu.hwcaps=-AVX512F,-AVX2" "LD_BIND_NOW=1", I still get a failure (I don't get the failure if I don't set GLIBC_TUNABLES and set only LD_BIND_NOW). So, even if we use plain SSE, the data somehow end up on the stack. Mikulas
