# git rev-parse -q --verify 8659a0e0efdd975c73355dbc033f79ba3b31e82c^{commit} 8659a0e0efdd975c73355dbc033f79ba3b31e82c already have revision, skipping fetch # git checkout -q -f -B kisskb 8659a0e0efdd975c73355dbc033f79ba3b31e82c # git clean -qxdf # < git log -1 # commit 8659a0e0efdd975c73355dbc033f79ba3b31e82c # Author: Michael Ellerman # Date: Wed May 20 23:36:05 2020 +1000 # # powerpc/64s: Disable STRICT_KERNEL_RWX # # Several strange crashes have been eventually traced back to # STRICT_KERNEL_RWX and its interaction with code patching. # # Various paths in our ftrace, kprobes and other patching code need to # be hardened against patching failures, otherwise we can end up running # with partially/incorrectly patched ftrace paths, kprobes or jump # labels, which can then cause strange crashes. # # Although fixes for those are in development, they're not -rc material. # # There also seem to be problems with the underlying strict RWX logic, # which needs further debugging. # # So for now disable STRICT_KERNEL_RWX on 64-bit to prevent people from # enabling the option and tripping over the bugs. # # Fixes: 1e0fc9d1eb2b ("powerpc/Kconfig: Enable STRICT_KERNEL_RWX for some configs") # Cc: stable@vger.kernel.org # v4.13+ # Signed-off-by: Michael Ellerman # Link: https://lore.kernel.org/r/20200520133605.972649-1-mpe@ellerman.id.au # < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version # < git log --format=%s --max-count=1 8659a0e0efdd975c73355dbc033f79ba3b31e82c # < make -s -j 8 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc40x_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- ppc40x_defconfig # < make -s -j 8 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc40x_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 8 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc40x_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig # make -s -j 8 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc40x_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- /kisskb/src/arch/powerpc/kernel/head_40x.S: Assembler messages: /kisskb/src/arch/powerpc/kernel/head_40x.S:805: Warning: invalid register expression INFO: Uncompressed kernel (size 0x596080) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) INFO: Uncompressed kernel (size 0x596080) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) INFO: Uncompressed kernel (size 0x5859d0) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) Image Name: Linux-5.7.0-rc2-14562-g8659a0e0e Created: Fri May 22 10:52:59 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2814701 Bytes = 2748.73 KiB = 2.68 MiB Load Address: 00000000 Entry Point: 00000000 INFO: Uncompressed kernel (size 0x596080) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) INFO: Uncompressed kernel (size 0x596080) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) Image Name: Linux-5.7.0-rc2-14562-g8659a0e0e Created: Fri May 22 10:52:59 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2846212 Bytes = 2779.50 KiB = 2.71 MiB Load Address: 00600000 Entry Point: 00601a18 Image Name: Linux-5.7.0-rc2-14562-g8659a0e0e Created: Fri May 22 10:52:59 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2846032 Bytes = 2779.33 KiB = 2.71 MiB Load Address: 00600000 Entry Point: 006017dc Completed OK # rm -rf /kisskb/build/powerpc-fixes_ppc40x_defconfig_powerpc-gcc5 # Build took: 0:01:17.376871