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3c12b4df8d
linux/arch/powerpc
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Russell Currey 3c12b4df8d powerpc/security: Use a mutex for interrupt exit code patching 
The mitigation-patching.sh script in the powerpc selftests toggles
all mitigations on and off simultaneously, revealing that rfi_flush
and stf_barrier cannot safely operate at the same time due to races
in updating the static key.

On some systems, the static key code throws a warning and the kernel
remains functional.  On others, the kernel will hang or crash.

Fix this by slapping on a mutex.

Fixes: 13799748b9 ("powerpc/64: use interrupt restart table to speed up return from interrupt")
Cc: stable@vger.kernel.org # v5.14+
Signed-off-by: Russell Currey <ruscur@russell.cc>
Acked-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211027072410.40950-1-ruscur@russell.cc
2021-10-28 17:23:58 +11:00
..
boot powerpc/boot: Set LC_ALL=C in wrapper script 2021-10-27 22:31:22 +11:00
configs powerpc/64s: Default to 64K pages for 64 bit book3s 2021-10-27 22:31:22 +11:00
crypto crypto: powepc/sha1 - remove unneeded semicolon 2021-03-07 15:13:14 +11:00
include powerpc/book3e: Fix set_memory_x() and set_memory_nx() 2021-10-28 00:41:29 +11:00
kernel powerpc/64s/interrupt: Fix check_return_regs_valid() false positive 2021-10-27 22:33:47 +11:00
kexec powerpc/machdep: Remove stale functions from ppc_md structure 2021-10-22 15:22:05 +11:00
kvm powerpc/asm: Remove UPD_CONSTR after GCC 4.9 removal 2021-10-09 00:15:59 +11:00
lib powerpc/security: Use a mutex for interrupt exit code patching 2021-10-28 17:23:58 +11:00
math-emu powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
mm powerpc/fsl_booke: Fix setting of exec flag when setting TLBCAMs 2021-10-28 00:41:29 +11:00
net powerpc/bpf: Fix write protecting JIT code 2021-10-28 00:08:32 +11:00
perf powerpc/perf: Fix cycles/instructions as PM_CYC/PM_INST_CMPL in power10 2021-10-14 21:46:45 +11:00
platforms powerpc/83xx/mpc8349emitx: Make mcu_gpiochip_remove() return void 2021-10-28 00:41:29 +11:00
purgatory powerpc/kexec: Don't use .machine ppc64 in trampoline_64.S 2021-04-08 21:17:43 +10:00
sysdev powerpc/xics: Set the IRQ chip data for the ICS native backend 2021-09-15 22:05:53 +10:00
tools powerpc/head_check: Fix shellcheck errors 2021-08-17 22:52:02 +10:00
xmon powerpc: Refactor verification of MSR_RI 2021-08-26 21:21:07 +10:00
Kbuild
Kconfig powerpc/64s: Default to 64K pages for 64 bit book3s 2021-10-27 22:31:22 +11:00
Kconfig.debug powerpc/ptdump: Convert powerpc to GENERIC_PTDUMP 2021-08-25 13:35:48 +10:00
Makefile powerpc: Add "-z notext" flag to disable diagnostic 2021-08-15 13:49:39 +10:00
Makefile.postlink