# git rev-parse -q --verify cc0bb290a0dabcdbc422fd4721e000ea115a5beb^{commit}
cc0bb290a0dabcdbc422fd4721e000ea115a5beb
already have revision, skipping fetch
# git checkout -q -f -B kisskb cc0bb290a0dabcdbc422fd4721e000ea115a5beb
# git clean -qxdf
# < git log -1
# commit cc0bb290a0dabcdbc422fd4721e000ea115a5beb
# Author: Christophe Leroy <christophe.leroy@c-s.fr>
# Date:   Sun Nov 25 11:48:22 2018 +0000
# 
#     powerpc/book3s32: Implement Kernel Userspace Access Protection
#     
#     This patch implements Kernel Userspace Access Protection for
#     book3s/32.
#     
#     Due to limitations of the processor page protection capabilities,
#     the protection is only against writing. read protection cannot be
#     achieved using page protection.
#     
#     The previous patch modifies the page protection so that RW user
#     pages are RW for Key 0 and RO for Key 1, and it sets Key 0 for
#     both user and kernel.
#     
#     This patch changes userspace segment registers are set to Ku 0
#     and Ks 1. When kernel needs to write to RW pages, the associated
#     segment register is then changed to Ks 0 in order to allow write
#     access to the kernel.
#     
#     In order to avoid having the read all segment registers when
#     locking/unlocking the access, some data is kept in the thread_struct
#     and saved on stack on exceptions. The field identifies both the
#     first unlocked segment and the first segment following the last
#     unlocked one. When no segment is unlocked, it contains value 0.
#     
#     Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
# < /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 cc0bb290a0dabcdbc422fd4721e000ea115a5beb
# < make -s -j 10 ARCH=powerpc O=/kisskb/build/chleroy_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 10 ARCH=powerpc O=/kisskb/build/chleroy_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:883: Warning: invalid register expression
INFO: Uncompressed kernel (size 0x53f6f0) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x600000)
INFO: Uncompressed kernel (size 0x53f6f0) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x600000)
INFO: Uncompressed kernel (size 0x53f6f0) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x600000)
INFO: Uncompressed kernel (size 0x52f010) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x600000)
INFO: Uncompressed kernel (size 0x53f6f0) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x600000)
Image Name:   Linux-5.0.0-gcc0bb290a0da
Created:      Wed Mar  6 11:46:37 2019
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    2692633 Bytes = 2629.52 KiB = 2.57 MiB
Load Address: 00600000
Entry Point:  006017dc
Image Name:   Linux-5.0.0-gcc0bb290a0da
Created:      Wed Mar  6 11:46:37 2019
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    2662042 Bytes = 2599.65 KiB = 2.54 MiB
Load Address: 00000000
Entry Point:  00000000
Image Name:   Linux-5.0.0-gcc0bb290a0da
Created:      Wed Mar  6 11:46:37 2019
Image Type:   PowerPC Linux Kernel Image (gzip compressed)
Data Size:    2693600 Bytes = 2630.47 KiB = 2.57 MiB
Load Address: 00600000
Entry Point:  00601a18
Completed OK
# rm -rf /kisskb/build/chleroy_ppc40x_defconfig_powerpc-gcc5
# Build took: 0:00:53.909926