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Nicholas Piggin 2ea31e2e62 powerpc/64s/interrupt: Fix interrupt exit race with security mitigation switch 
The RFI and STF security mitigation options can flip the
interrupt_exit_not_reentrant static branch condition concurrently with
the interrupt exit code which tests that branch.

Interrupt exit tests this condition to set MSR[EE|RI] for exit, then
again in the case a soft-masked interrupt is found pending, to recover
the MSR so the interrupt can be replayed before attempting to exit
again. If the condition changes between these two tests, the MSR and irq
soft-mask state will become corrupted, leading to warnings and possible
crashes. For example, if the branch is initially true then false,
MSR[EE] will be 0 but PACA_IRQ_HARD_DIS clear and EE may not get
enabled, leading to warnings in irq_64.c.

Fixes: 13799748b9 ("powerpc/64: use interrupt restart table to speed up return from interrupt")
Cc: stable@vger.kernel.org # v5.14+
Reported-by: Sachin Sant <sachinp@linux.ibm.com>
Tested-by: Sachin Sant <sachinp@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230206042240.92103-1-npiggin@gmail.com
2023-02-07 10:13:33 +11:00
..
alpha MM patches for 6.2-rc1. 2022-12-13 19:29:45 -08:00
arc MM patches for 6.2-rc1. 2022-12-13 19:29:45 -08:00
arm ARM: SoC fixes for 6.2 2022-12-19 16:07:59 -06:00
arm64 remoteproc updates for v6.2 2022-12-21 09:37:14 -08:00
csky arch/csky patches for 6.2-rc1 2022-12-19 07:51:30 -06:00
hexagon MM patches for 6.2-rc1. 2022-12-13 19:29:45 -08:00
ia64 - Add the call depth tracking mitigation for Retbleed which has 2022-12-14 15:03:00 -08:00
loongarch LoongArch changes for v6.2 2022-12-19 08:23:27 -06:00
m68k m68k: remove broken strcmp implementation 2022-12-21 08:56:43 -08:00
microblaze MM patches for 6.2-rc1. 2022-12-13 19:29:45 -08:00
mips Fixes due to DT changes 2022-12-23 10:49:45 -08:00
nios2 MM patches for 6.2-rc1. 2022-12-13 19:29:45 -08:00
openrisc MM patches for 6.2-rc1. 2022-12-13 19:29:45 -08:00
parisc parisc architecture fixes for kernel v6.2-rc1: 2022-12-20 08:43:53 -06:00
powerpc powerpc/64s/interrupt: Fix interrupt exit race with security mitigation switch 2023-02-07 10:13:33 +11:00
riscv KVM/riscv changes for 6.2 2022-12-21 18:52:15 -08:00
s390 random: do not include <asm/archrandom.h> from random.h 2022-12-20 03:13:45 +01:00
sh treewide: Convert del_timer*() to timer_shutdown*() 2022-12-25 13:38:09 -08:00
sparc MM patches for 6.2-rc1. 2022-12-13 19:29:45 -08:00
um New Feature: 2022-12-17 14:06:53 -06:00
x86 - Pass only an initialized perf event attribute to the LSM hook 2023-01-01 11:27:00 -08:00
xtensa MM patches for 6.2-rc1. 2022-12-13 19:29:45 -08:00
.gitignore
Kconfig arm64 fixes for -rc1 2022-12-16 13:46:41 -06:00