AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/arch/x86/entry
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Andy Lutomirski 83c133cf11 x86/nmi/64: Fix a paravirt stack-clobbering bug in the NMI code 
The NMI entry code that switches to the normal kernel stack needs to
be very careful not to clobber any extra stack slots on the NMI
stack.  The code is fine under the assumption that SWAPGS is just a
normal instruction, but that assumption isn't really true.  Use
SWAPGS_UNSAFE_STACK instead.

This is part of a fix for some random crashes that Sasha saw.

Fixes: 9b6e6a8334 ("x86/nmi/64: Switch stacks on userspace NMI entry")
Reported-and-tested-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/974bc40edffdb5c2950a5c4977f821a446b76178.1442791737.git.luto@kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2015-09-22 22:40:36 +02:00
..
syscalls sys_membarrier(): system-wide memory barrier (generic, x86) 2015-09-11 15:21:34 -07:00
vdso x86/vdso: Emit a GNU hash 2015-08-08 10:42:07 +02:00
vsyscall mm: mark most vm_operations_struct const 2015-09-10 13:29:01 -07:00
calling.h x86/asm/entry/64: Save all regs on interrupt entry 2015-07-07 10:59:07 +02:00
common.c x86/entry: Remove do_notify_resume(), syscall_trace_leave(), and their TIF masks 2015-08-05 10:54:35 +02:00
entry_32.S x86/entry/32: Migrate to C exit path 2015-08-05 10:54:35 +02:00
entry_64_compat.S Merge branch 'x86/urgent' into x86/asm to fix up conflicts and to pick up fixes 2015-08-18 09:39:47 +02:00
entry_64.S x86/nmi/64: Fix a paravirt stack-clobbering bug in the NMI code 2015-09-22 22:40:36 +02:00
Makefile x86/entry: Move C entry and exit code to arch/x86/entry/common.c 2015-07-07 10:59:05 +02:00
syscall_32.c x86/asm/entry: (Re-)rename __NR_entry_INT80_compat_max to __NR_syscall_compat_max 2015-06-08 23:43:38 +02:00
syscall_64.c
thunk_32.S Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
thunk_64.S Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00