Buildresult: powerpc-fixes/x86_64-defconfig/x86_64-gcc8 built on Jun 7 2019, 02:39

kisskb

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Status:	OK
Date/Time:	Jun 7 2019, 02:39
Duration:	0:01:59.159281
Builder:	ka1
Revision:	powerpc: fix kexec failure on book3s/32 (`c14cbef0319d21339a76247c3061230ae2950a7c)`
Target:	powerpc-fixes/x86_64-defconfig/x86_64-gcc8
Branch:	powerpc-fixes
Compiler:	x86_64-gcc8 (x86_64-linux-gcc (GCC) 8.1.0 / GNU ld (GNU Binutils) 2.30)
Config:	defconfig (download)
Log:	Download original No warnings found in log. Full Log # git rev-parse -q --verify c14cbef0319d21339a76247c3061230ae2950a7c^{commit} c14cbef0319d21339a76247c3061230ae2950a7c already have revision, skipping fetch # git checkout -q -f -B kisskb c14cbef0319d21339a76247c3061230ae2950a7c # git clean -qxdf # < git log -1 # commit c14cbef0319d21339a76247c3061230ae2950a7c # Author: Christophe Leroy <christophe.leroy@c-s.fr> # Date: Mon Jun 3 08:20:28 2019 +0000 # # powerpc: fix kexec failure on book3s/32 # # In the old days, _PAGE_EXEC didn't exist on 6xx aka book3s/32. # Therefore, allthough __mapin_ram_chunk() was already mapping kernel # text with PAGE_KERNEL_TEXT and the rest with PAGE_KERNEL, the entire # memory was executable. Part of the memory (first 512kbytes) was # mapped with BATs instead of page table, but it was also entirely # mapped as executable. # # In commit 385e89d5b20f ("powerpc/mm: add exec protection on # powerpc 603"), we started adding exec protection to some 6xx, namely # the 603, for pages mapped via pagetables. # # Then, in commit 63b2bc619565 ("powerpc/mm/32s: Use BATs for # STRICT_KERNEL_RWX"), the exec protection was extended to BAT mapped # memory, so that really only the kernel text could be executed. # # The problem here is that kexec is based on copying some code into # upper part of memory then executing it from there in order to install # a fresh new kernel at its definitive location. # # However, the code is position independant and first part of it is # just there to deactivate the MMU and jump to the second part. So it # is possible to run this first part inplace instead of running the # copy. Once the MMU is off, there is no protection anymore and the # second part of the code will just run as before. # # Reported-by: Aaro Koskinen <aaro.koskinen@iki.fi> # Fixes: 63b2bc619565 ("powerpc/mm/32s: Use BATs for STRICT_KERNEL_RWX") # Cc: stable@vger.kernel.org # Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> # Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-ld --version # < git log --format=%s --max-count=1 c14cbef0319d21339a76247c3061230ae2950a7c # < make -s -j 48 ARCH=x86 O=/kisskb/build/powerpc-fixes_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux- x86_64_defconfig # make -s -j 48 ARCH=x86 O=/kisskb/build/powerpc-fixes_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux- Completed OK # rm -rf /kisskb/build/powerpc-fixes_x86_64_defconfig_x86_64-gcc8 # Build took: 0:01:59.159281

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