# git rev-parse -q --verify 51c3c62b58b357e8d35e4cc32f7b4ec907426fe3^{commit} 51c3c62b58b357e8d35e4cc32f7b4ec907426fe3 already have revision, skipping fetch # git checkout -q -f -B kisskb 51c3c62b58b357e8d35e4cc32f7b4ec907426fe3 # git clean -qxdf # < git log -1 # commit 51c3c62b58b357e8d35e4cc32f7b4ec907426fe3 # Author: Michael Neuling # Date: Fri Sep 14 11:14:11 2018 +1000 # # powerpc: Avoid code patching freed init sections # # This stops us from doing code patching in init sections after they've # been freed. # # In this chain: # kvm_guest_init() -> # kvm_use_magic_page() -> # fault_in_pages_readable() -> # __get_user() -> # __get_user_nocheck() -> # barrier_nospec(); # # We have a code patching location at barrier_nospec() and # kvm_guest_init() is an init function. This whole chain gets inlined, # so when we free the init section (hence kvm_guest_init()), this code # goes away and hence should no longer be patched. # # We seen this as userspace memory corruption when using a memory # checker while doing partition migration testing on powervm (this # starts the code patching post migration via # /sys/kernel/mobility/migration). In theory, it could also happen when # using /sys/kernel/debug/powerpc/barrier_nospec. # # Cc: stable@vger.kernel.org # 4.13+ # Signed-off-by: Michael Neuling # Reviewed-by: Nicholas Piggin # Reviewed-by: Christophe Leroy # Signed-off-by: Michael Ellerman # < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < git log --format=%s --max-count=1 51c3c62b58b357e8d35e4cc32f7b4ec907426fe3 # < make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc83xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- mpc83xx_defconfig # make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc83xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- arch/powerpc/boot/mpc832x_rdb.dtb: Warning (interrupts_property): /qe@e0100000/mdio@3120/ethernet-phy@0:#interrupt-cells: size is (4), expected multiple of 8 arch/powerpc/boot/mpc832x_rdb.dtb: Warning (interrupts_property): /qe@e0100000/mdio@3120/ethernet-phy@4:#interrupt-cells: size is (4), expected multiple of 8 INFO: Uncompressed kernel (size 0x613950) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x700000) INFO: Uncompressed kernel (size 0x613950) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x700000) INFO: Uncompressed kernel (size 0x613950) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x700000) INFO: Uncompressed kernel (size 0x613950) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x700000) INFO: Uncompressed kernel (size 0x613950) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x700000) INFO: Uncompressed kernel (size 0x613950) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x700000) INFO: Uncompressed kernel (size 0x603238) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x700000) INFO: Uncompressed kernel (size 0x613950) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x700000) Image Name: Linux-4.19.0-rc3-g51c3c62b58b35 Created: Wed Sep 19 00:10:45 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3085437 Bytes = 3013.12 KiB = 2.94 MiB Load Address: 00000000 Entry Point: 00000000 Image Name: Linux-4.19.0-rc3-g51c3c62b58b35 Created: Wed Sep 19 00:10:45 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3109555 Bytes = 3036.67 KiB = 2.97 MiB Load Address: 00700000 Entry Point: 007001f4 Image Name: Linux-4.19.0-rc3-g51c3c62b58b35 Created: Wed Sep 19 00:10:45 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3109191 Bytes = 3036.32 KiB = 2.97 MiB Load Address: 00700000 Entry Point: 007001f4 Image Name: Linux-4.19.0-rc3-g51c3c62b58b35 Created: Wed Sep 19 00:10:45 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3109904 Bytes = 3037.02 KiB = 2.97 MiB Load Address: 00700000 Entry Point: 007001f4 Image Name: Linux-4.19.0-rc3-g51c3c62b58b35 Created: Wed Sep 19 00:10:45 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3109599 Bytes = 3036.72 KiB = 2.97 MiB Load Address: 00700000 Entry Point: 007001f4 Image Name: Linux-4.19.0-rc3-g51c3c62b58b35 Created: Wed Sep 19 00:10:45 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3109630 Bytes = 3036.75 KiB = 2.97 MiB Load Address: 00700000 Entry Point: 007001f4 Image Name: Linux-4.19.0-rc3-g51c3c62b58b35 Created: Wed Sep 19 00:10:45 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3108910 Bytes = 3036.04 KiB = 2.96 MiB Load Address: 00700000 Entry Point: 007001f4 Completed OK # rm -rf /kisskb/build/powerpc-fixes_mpc83xx_defconfig_powerpc-gcc5 # Build took: 0:00:18.876828