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6d9256f0a8
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Andy Lutomirski 6d9256f0a8 x86/espfix/64: Stop assuming that pt_regs is on the entry stack 
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 make the code continue to work
when an entry stack is added.

While we're at it, improve the comments to explain what's actually
going on.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Borislav Petkov <bpetkov@suse.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Laight <David.Laight@aculab.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Eduardo Valentin <eduval@amazon.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: aliguori@amazon.com
Cc: daniel.gruss@iaik.tugraz.at
Cc: hughd@google.com
Cc: keescook@google.com
Link: https://lkml.kernel.org/r/20171204150606.130778051@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-12-17 13:59:57 +01:00
..
alpha License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
arc License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
arm Merge branch 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm 2017-11-09 17:41:39 -08:00
arm64 Merge branch 'upstream-acpi-fixes' into WIP.x86/pti.base 2017-12-17 13:09:31 +01:00
blackfin License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
c6x License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
cris License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
frv License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
h8300 License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
hexagon License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
ia64 Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-05 12:14:50 -08:00
m32r License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
m68k License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
metag License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
microblaze License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
mips MIPS: AR7: Ensure that serial ports are properly set up 2017-11-08 14:57:55 +00:00
mn10300 License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
nios2 License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
openrisc License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
parisc License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
powerpc PPC KVM fixes for 4.14 2017-11-08 14:08:59 +01:00
s390 License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
score License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
sh License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
sparc License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
tile Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2017-11-03 10:36:43 -07:00
um bpf: fix build issues on um due to mising bpf_perf_event.h 2017-12-17 13:56:34 +01:00
unicore32 License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
x86 x86/espfix/64: Stop assuming that pt_regs is on the entry stack 2017-12-17 13:59:57 +01:00
xtensa License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
.gitignore
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00