# git rev-parse -q --verify 6e693b3ffecb0b478c7050b44a4842854154f715^{commit}
6e693b3ffecb0b478c7050b44a4842854154f715
already have revision, skipping fetch
# git checkout -q -f -B kisskb 6e693b3ffecb0b478c7050b44a4842854154f715
# git clean -qxdf
# < git log -1
# commit 6e693b3ffecb0b478c7050b44a4842854154f715
# Author: Will Deacon <will.deacon@arm.com>
# Date:   Sat Jan 19 21:56:05 2019 +0000
# 
#     x86: uaccess: Inhibit speculation past access_ok() in user_access_begin()
#     
#     Commit 594cc251fdd0 ("make 'user_access_begin()' do 'access_ok()'")
#     makes the access_ok() check part of the user_access_begin() preceding a
#     series of 'unsafe' accesses.  This has the desirable effect of ensuring
#     that all 'unsafe' accesses have been range-checked, without having to
#     pick through all of the callsites to verify whether the appropriate
#     checking has been made.
#     
#     However, the consolidated range check does not inhibit speculation, so
#     it is still up to the caller to ensure that they are not susceptible to
#     any speculative side-channel attacks for user addresses that ultimately
#     fail the access_ok() check.
#     
#     This is an oversight, so use __uaccess_begin_nospec() to ensure that
#     speculation is inhibited until the access_ok() check has passed.
#     
#     Reported-by: Julien Thierry <julien.thierry@arm.com>
#     Signed-off-by: Will Deacon <will.deacon@arm.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-gcc --version
# < /opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-ld --version
# < git log --format=%s --max-count=1 6e693b3ffecb0b478c7050b44a4842854154f715
# < make -s -j 48 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  randconfig
KCONFIG_SEED=0xD323288C

WARNING: unmet direct dependencies detected for ARM64_ERRATUM_845719
  Depends on [n]: COMPAT [=n]
  Selected by [y]:
  - ARCH_MXC [=y]

WARNING: unmet direct dependencies detected for TI_SOC_THERMAL
  Depends on [n]: THERMAL [=y] && (ARCH_HAS_BANDGAP || COMPILE_TEST [=n]) && HAS_IOMEM [=y]
  Selected by [m]:
  - MMC_SDHCI_OMAP [=m] && MMC [=y] && MMC_SDHCI_PLTFM [=m] && OF [=y]

WARNING: unmet direct dependencies detected for TI_SOC_THERMAL
  Depends on [n]: THERMAL [=y] && (ARCH_HAS_BANDGAP || COMPILE_TEST [=n]) && HAS_IOMEM [=y]
  Selected by [m]:
  - MMC_SDHCI_OMAP [=m] && MMC [=y] && MMC_SDHCI_PLTFM [=m] && OF [=y]

WARNING: unmet direct dependencies detected for ARM64_ERRATUM_845719
  Depends on [n]: COMPAT [=n]
  Selected by [y]:
  - ARCH_MXC [=y]
# Added to kconfig CONFIG_PREVENT_FIRMWARE_BUILD=y
# yes \n | make -s -j 48 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  oldconfig
yes: standard output: Broken pipe
# make -s -j 48 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  
arch/arm64/Makefile:27: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum
arch/arm64/Makefile:40: LSE atomics not supported by binutils

WARNING: unmet direct dependencies detected for TI_SOC_THERMAL
  Depends on [n]: THERMAL [=y] && (ARCH_HAS_BANDGAP || COMPILE_TEST [=n]) && HAS_IOMEM [=y]
  Selected by [m]:
  - MMC_SDHCI_OMAP [=m] && MMC [=y] && MMC_SDHCI_PLTFM [=m] && OF [=y]

WARNING: unmet direct dependencies detected for ARM64_ERRATUM_845719
  Depends on [n]: COMPAT [=n]
  Selected by [y]:
  - ARCH_MXC [=y]

WARNING: unmet direct dependencies detected for ARM64_ERRATUM_845719
  Depends on [n]: COMPAT [=n]
  Selected by [y]:
  - ARCH_MXC [=y]

WARNING: unmet direct dependencies detected for TI_SOC_THERMAL
  Depends on [n]: THERMAL [=y] && (ARCH_HAS_BANDGAP || COMPILE_TEST [=n]) && HAS_IOMEM [=y]
  Selected by [m]:
  - MMC_SDHCI_OMAP [=m] && MMC [=y] && MMC_SDHCI_PLTFM [=m] && OF [=y]

WARNING: unmet direct dependencies detected for TI_SOC_THERMAL
  Depends on [n]: THERMAL [=y] && (ARCH_HAS_BANDGAP || COMPILE_TEST [=n]) && HAS_IOMEM [=y]
  Selected by [m]:
  - MMC_SDHCI_OMAP [=m] && MMC [=y] && MMC_SDHCI_PLTFM [=m] && OF [=y]

WARNING: unmet direct dependencies detected for ARM64_ERRATUM_845719
  Depends on [n]: COMPAT [=n]
  Selected by [y]:
  - ARCH_MXC [=y]
arch/arm64/Makefile:27: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum
arch/arm64/Makefile:40: LSE atomics not supported by binutils
Completed OK
# rm -rf /kisskb/build/linus-rand_arm64-randconfig_arm64-gcc5.4
# Build took: 0:03:26.093915