# git rev-parse -q --verify cb42033f5d172b5779b6c8301c65693ff6a0a778^{commit} cb42033f5d172b5779b6c8301c65693ff6a0a778 already have revision, skipping fetch # git checkout -q -f -B kisskb cb42033f5d172b5779b6c8301c65693ff6a0a778 # git clean -qxdf # < git log -1 # commit cb42033f5d172b5779b6c8301c65693ff6a0a778 # Author: Christophe Leroy # Date: Mon Mar 11 08:30:38 2019 +0000 # # powerpc/32s: 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. # # As the hash_page() function is not able to easily determine if a # protfault is due to a bad kernel access to userspace, protfaults # need to be handled by handle_page_fault when KUAP is set. # # Signed-off-by: Christophe Leroy # [mpe: Drop allow_read/write_to/from_user() as they're now in kup.h, # and adapt allow_user_access() to do nothing when to == NULL] # Signed-off-by: Michael Ellerman # < /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 cb42033f5d172b5779b6c8301c65693ff6a0a778 # < make -s -j 80 ARCH=powerpc O=/kisskb/build/mpe_ppc6xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- ppc6xx_defconfig # make -s -j 80 ARCH=powerpc O=/kisskb/build/mpe_ppc6xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- :1478:2: warning: #warning syscall pidfd_send_signal not implemented [-Wcpp] :1481:2: warning: #warning syscall io_uring_setup not implemented [-Wcpp] :1484:2: warning: #warning syscall io_uring_enter not implemented [-Wcpp] :1487:2: warning: #warning syscall io_uring_register not implemented [-Wcpp] /kisskb/src/kernel/futex.c: In function 'do_futex': /kisskb/src/kernel/futex.c:1658:17: warning: 'oldval' may be used uninitialized in this function [-Wmaybe-uninitialized] return oldval == cmparg; ^ /kisskb/src/kernel/futex.c:1633:6: note: 'oldval' was declared here int oldval, ret; ^ In file included from /kisskb/src/sound/ppc/pmac.h:25:0, from /kisskb/src/sound/ppc/awacs.c:29: /kisskb/src/sound/ppc/awacs.c: In function 'snd_pmac_awacs_init': /kisskb/src/include/sound/control.h:223:9: warning: 'speaker_vol' may be used uninitialized in this function [-Wmaybe-uninitialized] return _snd_ctl_add_slave(master, slave, 0); ^ /kisskb/src/sound/ppc/awacs.c:886:36: note: 'speaker_vol' was declared here struct snd_kcontrol *master_vol, *speaker_vol; ^ WARNING: vmlinux.o(.text+0x1d818): Section mismatch in reference from the function setup_kup() to the function .init.text:setup_kuep() The function setup_kup() references the function __init setup_kuep(). This is often because setup_kup lacks a __init annotation or the annotation of setup_kuep is wrong. WARNING: vmlinux.o(.text+0x1d830): Section mismatch in reference from the function setup_kup() to the function .init.text:setup_kuap() The function setup_kup() references the function __init setup_kuap(). This is often because setup_kup lacks a __init annotation or the annotation of setup_kuap is wrong. INFO: Uncompressed kernel (size 0xaef534) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaef534) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaef534) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaef534) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaef534) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaef534) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaef534) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaef534) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaef534) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xaef534) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xadee1c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) INFO: Uncompressed kernel (size 0xadee1c) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xb00000) Image Name: Linux-5.1.0-rc3+ Created: Fri Apr 19 23:29:08 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5260438 Bytes = 5137.15 KiB = 5.02 MiB Load Address: 00b00000 Entry Point: 00b00294 Image Name: Linux-5.1.0-rc3+ Created: Fri Apr 19 23:29:08 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5260568 Bytes = 5137.27 KiB = 5.02 MiB Load Address: 00b00000 Entry Point: 00b00894 Image Name: Linux-5.1.0-rc3+ Created: Fri Apr 19 23:29:08 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5259984 Bytes = 5136.70 KiB = 5.02 MiB Load Address: 00b00000 Entry Point: 00b00294 Image Name: Linux-5.1.0-rc3+ Created: Fri Apr 19 23:29:09 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5260029 Bytes = 5136.75 KiB = 5.02 MiB Load Address: 00b00000 Entry Point: 00b00294 Image Name: Linux-5.1.0-rc3+ Created: Fri Apr 19 23:29:09 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5260107 Bytes = 5136.82 KiB = 5.02 MiB Load Address: 00b00000 Entry Point: 00b00294 Image Name: Linux-5.1.0-rc3+ Created: Fri Apr 19 23:29:09 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5260475 Bytes = 5137.18 KiB = 5.02 MiB Load Address: 00b00000 Entry Point: 00b00294 Image Name: Linux-5.1.0-rc3+ Created: Fri Apr 19 23:29:09 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5229845 Bytes = 5107.27 KiB = 4.99 MiB Load Address: 00000000 Entry Point: 00000000 Image Name: Linux-5.1.0-rc3+ Created: Fri Apr 19 23:29:09 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5260112 Bytes = 5136.83 KiB = 5.02 MiB Load Address: 00b00000 Entry Point: 00b00294 Image Name: Linux-5.1.0-rc3+ Created: Fri Apr 19 23:29:09 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 5260423 Bytes = 5137.13 KiB = 5.02 MiB Load Address: 00b00000 Entry Point: 00b00894 Completed OK # rm -rf /kisskb/build/mpe_ppc6xx_defconfig_powerpc-gcc5 # Build took: 0:03:18.490117