# 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/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-ld --version
# < git log --format=%s --max-count=1 cc0bb290a0dabcdbc422fd4721e000ea115a5beb
# < make -s -j 8 ARCH=powerpc O=/kisskb/build/chleroy_gamecube_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  gamecube_defconfig
# make -s -j 8 ARCH=powerpc O=/kisskb/build/chleroy_gamecube_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:186:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields':
/kisskb/src/kernel/rcu/srcutree.c:133:34: warning: 'levelspread[<U4960>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:100:6: note: 'levelspread[<U4960>]' was declared here
/kisskb/src/kernel/trace/trace_dynevent.c: In function 'create_dyn_event':
/kisskb/src/kernel/trace/trace_dynevent.c:89:5: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c: In function 'proc_reg_open':
/kisskb/src/include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c:339:21: note: 'pdeo' was declared here
/kisskb/src/kernel/futex.c: In function 'do_futex':
/kisskb/src/kernel/futex.c:1662:3: warning: 'oldval' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/futex.c:1637:6: note: 'oldval' was declared here
INFO: Uncompressed kernel (size 0x6f5f9c) overlaps the address of the wrapper(0x600000)
INFO: Fixing the link_address of wrapper to (0x700000)
Completed OK
# rm -rf /kisskb/build/chleroy_gamecube_defconfig_powerpc-gcc4.6
# Build took: 0:00:55.715559