In case it matters: Acked-by: H. Peter Anvin <[email protected]>
On April 26, 2015 5:51:26 PM PDT, Linus Torvalds <[email protected]> wrote: >Just a heads-up to the x86 people: I'm going to merge this directly, >since I'm doing -rc1 momentarily, and without this patch 32-bit >user-land on a 64-bit kernel is flaky on all AMD CPU's. Which I don't >want for -rc1. > > Linus > >On Sun, Apr 26, 2015 at 4:47 PM, Andy Lutomirski <[email protected]> >wrote: >> AMD CPUs don't reinitialize the SS descriptor on SYSRET, so SYSRET >> with SS == 0 results in an invalid usermode state in which SS is >> apparently equal to __USER_DS but causes #SS if used. >> >> Work around the issue by setting SS to __KERNEL_DS __switch_to, thus >> ensuring that SYSRET never happens with SS set to NULL. -- Sent from my mobile phone. Please pardon brevity and lack of formatting. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
