Re: hppa lazy FPU switching and QEMU bugs
Taylor R Campbell <[email protected]>
| Newsgroups | gmane.os.netbsd.devel.crypto |
|---|---|
| Message-ID | <[email protected]> |
> Date: Mon, 3 Aug 2026 22:57:54 -0400 > From: Thor Lancelot Simon <[email protected]> > References: <[email protected]> > > On Mon, Aug 03, 2026 at 03:59:18PM -0400, Thor Lancelot Simon wrote: > > > > This host manages QEMU guests running the exact same version of NetBSD > > on 14 other emulated architectures. Only hppa blows up like this. I > > suppose some day someone will figure out why. > > Actually the problem is not ML-KEM at all nor OpenSSL. It's a bug in QEMU, > an information leak that can swap processes' FP registers! Yes, and we already have an open PR about this: PR port-hppa/59114: hppa: eager fpu switching for qemu and/or spectre mitigation https://gnats.NetBSD.org/59114 I expect there are various tests in /usr/tests/kernel, /usr/tests/lib/libc, and/or /usr/tests/lib/libm that confirm this already; we just don't run them on hppa as part of the releng testbed.