# git rev-parse -q --verify af11dee4361b3519981fa04d014873f9d9edd6ac^{commit} af11dee4361b3519981fa04d014873f9d9edd6ac already have revision, skipping fetch # git checkout -q -f -B kisskb af11dee4361b3519981fa04d014873f9d9edd6ac # git clean -qxdf # < git log -1 # commit af11dee4361b3519981fa04d014873f9d9edd6ac # Author: Christophe Leroy # Date: Tue Nov 30 09:42:37 2021 +0100 # # powerpc/32s: Fix shift-out-of-bounds in KASAN init # # ================================================================================ # UBSAN: shift-out-of-bounds in arch/powerpc/mm/kasan/book3s_32.c:22:23 # shift exponent -1 is negative # CPU: 0 PID: 0 Comm: swapper Not tainted 5.15.5-gentoo-PowerMacG4 #9 # Call Trace: # [c214be60] [c0ba0048] dump_stack_lvl+0x80/0xb0 (unreliable) # [c214be80] [c0b99288] ubsan_epilogue+0x10/0x5c # [c214be90] [c0b98fe0] __ubsan_handle_shift_out_of_bounds+0x94/0x138 # [c214bf00] [c1c0f010] kasan_init_region+0xd8/0x26c # [c214bf30] [c1c0ed84] kasan_init+0xc0/0x198 # [c214bf70] [c1c08024] setup_arch+0x18/0x54c # [c214bfc0] [c1c037f0] start_kernel+0x90/0x33c # [c214bff0] [00003610] 0x3610 # ================================================================================ # # This happens when the directly mapped memory is a power of 2. # # Fix it by checking the shift and set the result to 0 when shift is -1 # # Fixes: 7974c4732642 ("powerpc/32s: Implement dedicated kasan_init_region()") # Reported-by: Erhard Furtner # Signed-off-by: Christophe Leroy # Signed-off-by: Michael Ellerman # Link: https://bugzilla.kernel.org/show_bug.cgi?id=215169 # Link: https://lore.kernel.org/r/15cbc3439d4ad988b225e2119ec99502a5cc6ad3.1638261744.git.christophe.leroy@csgroup.eu # < /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 af11dee4361b3519981fa04d014873f9d9edd6ac # < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_pmac32_defconfig+kexec_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- pmac32_defconfig # Added to kconfig configs/2006/11/29/pmac32_defconfigkexec # < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_pmac32_defconfig+kexec_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_pmac32_defconfig+kexec_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig .config:4263:warning: unexpected data: configs/2006/11/29/pmac32_defconfigkexec # make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_pmac32_defconfig+kexec_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- :1559:2: warning: #warning syscall futex_waitv not implemented [-Wcpp] Completed OK # rm -rf /kisskb/build/powerpc-next_pmac32_defconfig+kexec_powerpc-gcc5 # Build took: 0:01:49.646706