# git rev-parse -q --verify 2ea31e2e62bbc4d11c411eeb36f1b02841dbcab1^{commit} 2ea31e2e62bbc4d11c411eeb36f1b02841dbcab1 already have revision, skipping fetch # git checkout -q -f -B kisskb 2ea31e2e62bbc4d11c411eeb36f1b02841dbcab1 # git clean -qxdf # < git log -1 # commit 2ea31e2e62bbc4d11c411eeb36f1b02841dbcab1 # Author: Nicholas Piggin # Date: Mon Feb 6 14:22:40 2023 +1000 # # 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: 13799748b957 ("powerpc/64: use interrupt restart table to speed up return from interrupt") # Cc: stable@vger.kernel.org # v5.14+ # Reported-by: Sachin Sant # Tested-by: Sachin Sant # Signed-off-by: Nicholas Piggin # Signed-off-by: Michael Ellerman # Link: https://lore.kernel.org/r/20230206042240.92103-1-npiggin@gmail.com # < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version # < git log --format=%s --max-count=1 2ea31e2e62bbc4d11c411eeb36f1b02841dbcab1 # < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_powernv_defconfig+NO_RADIX_powerpc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux- powernv_defconfig # Added to kconfig CONFIG_PPC_RADIX_MMU=n # < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_powernv_defconfig+NO_RADIX_powerpc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_powernv_defconfig+NO_RADIX_powerpc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig # make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-fixes_powernv_defconfig+NO_RADIX_powerpc-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux- arch/powerpc/kernel/head_64.o: warning: objtool: end_first_256B(): can't find starting instruction arch/powerpc/kernel/optprobes_head.o: warning: objtool: optprobe_template_end(): can't find starting instruction Completed OK # rm -rf /kisskb/build/powerpc-fixes_powernv_defconfig+NO_RADIX_powerpc-gcc11 # Build took: 0:03:02.992014