# git rev-parse -q --verify 19ab500edb5d6020010caba48ce3b4ce4182ab63^{commit}
19ab500edb5d6020010caba48ce3b4ce4182ab63
already have revision, skipping fetch
# git checkout -q -f -B kisskb 19ab500edb5d6020010caba48ce3b4ce4182ab63
# git clean -qxdf
# < git log -1
# commit 19ab500edb5d6020010caba48ce3b4ce4182ab63
# Author: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
# Date:   Sat Jun 27 12:31:46 2020 +0530
# 
#     powerpc/mm/pkeys: Make pkey access check work on execute_only_key
#     
#     Jan reported that LTP mmap03 was getting stuck in a page fault loop
#     after commit c46241a370a6 ("powerpc/pkeys: Check vma before returning
#     key fault error to the user"), as well as a minimised reproducer:
#     
#       #include <fcntl.h>
#       #include <stdio.h>
#       #include <stdlib.h>
#       #include <unistd.h>
#       #include <sys/mman.h>
#     
#       int main(int ac, char **av)
#       {
#             int page_sz = getpagesize();
#             int fildes;
#             char *addr;
#     
#             fildes = open("tempfile", O_WRONLY | O_CREAT, 0666);
#             write(fildes, &fildes, sizeof(fildes));
#             close(fildes);
#     
#             fildes = open("tempfile", O_RDONLY);
#             unlink("tempfile");
#     
#             addr = mmap(0, page_sz, PROT_EXEC, MAP_FILE | MAP_PRIVATE, fildes, 0);
#     
#             printf("%d\n", *addr);
#             return 0;
#       }
#     
#     And noticed that access_pkey_error() in page fault handler now always
#     seem to return false:
#     
#       __do_page_fault
#         access_pkey_error(is_pkey: 1, is_exec: 0, is_write: 0)
#           arch_vma_access_permitted
#             pkey_access_permitted
#               if (!is_pkey_enabled(pkey))
#                 return true
#           return false
#     
#     pkey_access_permitted() should not check if the pkey is available in
#     UAMOR (using is_pkey_enabled()). The kernel needs to do that check
#     only when allocating keys. This also makes sure the execute_only_key
#     which is marked as non-manageable via UAMOR is handled correctly in
#     pkey_access_permitted(), and fixes the bug.
#     
#     Fixes: c46241a370a6 ("powerpc/pkeys: Check vma before returning key fault error to the user")
#     Reported-by: Jan Stancek <jstancek@redhat.com>
#     Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
#     [mpe: Include bug report details etc. in the change log]
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20200627070147.297535-1-aneesh.kumar@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 19ab500edb5d6020010caba48ce3b4ce4182ab63
# < make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ep8248e_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ep8248e_defconfig
# < make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ep8248e_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ep8248e_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ep8248e_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_32.S: Assembler messages:
/kisskb/src/arch/powerpc/kernel/head_32.S:1091: Warning: invalid register expression
INFO: Uncompressed kernel (size 0x54db74) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x600000)
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_ep8248e_defconfig_powerpc-gcc5
# Build took: 0:01:05.922732