Re: [PATCH v2 12/18] x86/espfix/64: Stop assuming that pt_regs is on the entry stack

2017-11-23 Thread Thomas Gleixner
On Tue, 21 Nov 2017, Andy Lutomirski wrote: > When we start using an entry trampoline, a #GP from userspace will > be delivered on the entry stack, not on the task stack. Fix the > espfix64 #DF fixup to set up #GP according to TSS.SP0, rather than > assuming that pt_regs + 1 == SP0. This won't c

[PATCH v2 12/18] x86/espfix/64: Stop assuming that pt_regs is on the entry stack

2017-11-21 Thread Andy Lutomirski
When we start using an entry trampoline, a #GP from userspace will be delivered on the entry stack, not on the task stack. Fix the espfix64 #DF fixup to set up #GP according to TSS.SP0, rather than assuming that pt_regs + 1 == SP0. This won't change anything without an entry stack, but it will ma