# git rev-parse -q --verify 61e3acd8c693a14fc69b824cb5b08d02cb90a6e7^{commit}
61e3acd8c693a14fc69b824cb5b08d02cb90a6e7
already have revision, skipping fetch
# git checkout -q -f -B kisskb 61e3acd8c693a14fc69b824cb5b08d02cb90a6e7
# git clean -qxdf
# < git log -1
# commit 61e3acd8c693a14fc69b824cb5b08d02cb90a6e7
# Author: Andrew Donnellan <ajd@linux.ibm.com>
# Date:   Tue Dec 10 00:22:21 2019 +1100
# 
#     powerpc: Fix __clear_user() with KUAP enabled
#     
#     The KUAP implementation adds calls in clear_user() to enable and
#     disable access to userspace memory. However, it doesn't add these to
#     __clear_user(), which is used in the ptrace regset code.
#     
#     As there's only one direct user of __clear_user() (the regset code),
#     and the time taken to set the AMR for KUAP purposes is going to
#     dominate the cost of a quick access_ok(), there's not much point
#     having a separate path.
#     
#     Rename __clear_user() to __arch_clear_user(), and make __clear_user()
#     just call clear_user().
#     
#     Reported-by: syzbot+f25ecf4b2982d8c7a640@syzkaller-ppc64.appspotmail.com
#     Reported-by: Daniel Axtens <dja@axtens.net>
#     Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
#     Fixes: de78a9c42a79 ("powerpc: Add a framework for Kernel Userspace Access Protection")
#     Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com>
#     [mpe: Use __arch_clear_user() for the asm version like arm64 & nds32]
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20191209132221.15328-1-ajd@linux.ibm.com
# < /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 61e3acd8c693a14fc69b824cb5b08d02cb90a6e7
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_85xx_ksi8560_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  85xx/ksi8560_defconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_85xx_ksi8560_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
INFO: Uncompressed kernel (size 0x4d75a0) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x500000)
INFO: Uncompressed kernel (size 0x4c6f10) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x500000)
Image Name:   Linux-5.5.0-rc1-g61e3acd8c693
Created:      Tue Dec 17 01:39:01 2019
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    2501985 Bytes = 2443.34 KiB = 2.39 MiB
Load Address: 00000000
Entry Point:  00000000
Image Name:   Linux-5.5.0-rc1-g61e3acd8c693
Created:      Tue Dec 17 01:39:01 2019
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    2531775 Bytes = 2472.44 KiB = 2.41 MiB
Load Address: 00500000
Entry Point:  00500314
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_85xx_ksi8560_defconfig_powerpc-gcc5
# Build took: 0:00:37.421155