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e14fd4ba8f
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Andi Kleen e14fd4ba8f x86/split-lock: Avoid returning with interrupts enabled 
When a split lock is detected always make sure to disable interrupts
before returning from the trap handler.

The kernel exit code assumes that all exits run with interrupts
disabled, otherwise the SWAPGS sequence can race against interrupts and
cause recursing page faults and later panics.

The problem will only happen on CPUs with split lock disable
functionality, so Icelake Server, Tiger Lake, Snow Ridge, Jacobsville.

Fixes: ca4c6a9858 ("x86/traps: Make interrupt enable/disable symmetric in C code")
Fixes: bce9b042ec ("x86/traps: Disable interrupts in exc_aligment_check()") # v5.8+
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-12-22 13:06:10 -08:00
..
alpha RTC for 5.11 2020-12-20 10:12:06 -08:00
arc tif-task_work.arch-2020-12-14 2020-12-16 12:33:35 -08:00
arm power supply and reset changes for the v5.11 series 2020-12-19 11:58:46 -08:00
arm64 ARM: 2020-12-20 10:44:05 -08:00
c6x tif-task_work.arch-2020-12-14 2020-12-16 12:33:35 -08:00
csky Tracing updates for 5.11 2020-12-17 13:22:17 -08:00
h8300 tif-task_work.arch-2020-12-14 2020-12-16 12:33:35 -08:00
hexagon tif-task_work.arch-2020-12-14 2020-12-16 12:33:35 -08:00
ia64 epoll: wire up syscall epoll_pwait2 2020-12-19 11:18:38 -08:00
m68k Fixes include: 2020-12-21 10:35:11 -08:00
microblaze epoll: wire up syscall epoll_pwait2 2020-12-19 11:18:38 -08:00
mips epoll: fix compat syscall wire up of epoll_pwait2 2020-12-20 10:01:38 -08:00
nds32 Tracing updates for 5.11 2020-12-17 13:22:17 -08:00
nios2 tif-task_work.arch-2020-12-14 2020-12-16 12:33:35 -08:00
openrisc OpenRISC updates for 5.11 2020-12-17 13:41:27 -08:00
parisc epoll: wire up syscall epoll_pwait2 2020-12-19 11:18:38 -08:00
powerpc epoll: wire up syscall epoll_pwait2 2020-12-19 11:18:38 -08:00
riscv The core framework got some nice improvements this time around. We gained the 2020-12-21 10:39:37 -08:00
s390 ARM: 2020-12-20 10:44:05 -08:00
sh The core framework got some nice improvements this time around. We gained the 2020-12-21 10:39:37 -08:00
sparc epoll: fix compat syscall wire up of epoll_pwait2 2020-12-20 10:01:38 -08:00
um This pull request contains the following changes for UML: 2020-12-17 17:56:44 -08:00
x86 x86/split-lock: Avoid returning with interrupts enabled 2020-12-22 13:06:10 -08:00
xtensa The core framework got some nice improvements this time around. We gained the 2020-12-21 10:39:37 -08:00
.gitignore
Kconfig Tracing updates for 5.11 2020-12-17 13:22:17 -08:00