# git rev-parse -q --verify f2c7e3562b4c4f1699acc1538ebf3e75f5cced35^{commit} f2c7e3562b4c4f1699acc1538ebf3e75f5cced35 already have revision, skipping fetch # git checkout -q -f -B kisskb f2c7e3562b4c4f1699acc1538ebf3e75f5cced35 # git clean -qxdf # < git log -1 # commit f2c7e3562b4c4f1699acc1538ebf3e75f5cced35 # Author: Russell Currey # Date: Fri Mar 10 16:08:34 2023 +1100 # # powerpc/mm: Fix false detection of read faults # # To support detection of read faults with Radix execute-only memory, the # vma_is_accessible() check in access_error() (which checks for PROT_NONE) # was replaced with a check to see if VM_READ was missing, and if so, # returns true to assert the fault was caused by a bad read. # # This is incorrect, as it ignores that both VM_WRITE and VM_EXEC imply # read on powerpc, as defined in protection_map[]. This causes mappings # containing VM_WRITE or VM_EXEC without VM_READ to misreport the cause of # page faults, since the MMU is still allowing reads. # # Correct this by restoring the original vma_is_accessible() check for # PROT_NONE mappings, and adding a separate check for Radix PROT_EXEC-only # mappings. # # Fixes: 395cac7752b9 ("powerpc/mm: Support execute-only memory on the Radix MMU") # Reported-by: Michal Suchánek # Link: https://lore.kernel.org/r/20230308152702.GR19419@kitsune.suse.cz # Tested-by: Benjamin Gray # Signed-off-by: Russell Currey # Signed-off-by: Michael Ellerman # Link: https://msgid.link/20230310050834.63105-1-ruscur@russell.cc # < /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 f2c7e3562b4c4f1699acc1538ebf3e75f5cced35 # < make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_le_defconfig+NO_SPLPAR_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- pseries_le_defconfig # Added to kconfig CONFIG_PPC_SPLPAR=n # < make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_le_defconfig+NO_SPLPAR_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_le_defconfig+NO_SPLPAR_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig # make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_le_defconfig+NO_SPLPAR_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- /kisskb/src/fs/btrfs/send.c: In function 'get_cur_inode_state': /kisskb/src/fs/btrfs/send.c:1902:23: warning: 'right_gen' may be used uninitialized in this function [-Wmaybe-uninitialized] if (left_gen == gen && right_gen == gen) { ^ /kisskb/src/fs/btrfs/send.c: At top level: cc1: warning: unrecognized command line option '-Wno-shift-negative-value' Completed OK # rm -rf /kisskb/build/powerpc-fixes_pseries_le_defconfig+NO_SPLPAR_powerpc-gcc5 # Build took: 0:02:12.801494