Buildresult: linus/or1ksim_defconfig/or32-gcc9 built on Dec 9 2020, 18:02

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Status:	OK
Date/Time:	Dec 9 2020, 18:02
Duration:	0:00:42.697445
Builder:	blade4b
Revision:	mm/madvise: remove racy mm ownership check (`a68a0262abdaa251e12c53715f48e698a18ef402)`
Target:	linus/or1ksim_defconfig/or32-gcc9
Branch:	linus
Compiler:	or32-gcc9 (or1k-linux-gcc (GCC) 9.3.0 / GNU ld (GNU Binutils) 2.34)
Config:	or1ksim_defconfig (download)
Log:	Download original No warnings found in log. Full Log # git rev-parse -q --verify a68a0262abdaa251e12c53715f48e698a18ef402^{commit} a68a0262abdaa251e12c53715f48e698a18ef402 already have revision, skipping fetch # git checkout -q -f -B kisskb a68a0262abdaa251e12c53715f48e698a18ef402 # git clean -qxdf # < git log -1 # commit a68a0262abdaa251e12c53715f48e698a18ef402 # Author: Minchan Kim <minchan@kernel.org> # Date: Tue Dec 8 20:57:18 2020 -0800 # # mm/madvise: remove racy mm ownership check # # Jann spotted the security hole due to race of mm ownership check. # # If the task is sharing the mm_struct but goes through execve() before # mm_access(), it could skip process_madvise_behavior_valid check. That # makes any advice hint to reach into the remote process. # # This patch removes the mm ownership check. With it, it will lose the # ability that local process could give any advice hint with vector # interface for some reason (e.g., performance). Since there is no # concrete example in upstream yet, it would be better to remove the # abiliity at this moment and need to review when such new advice comes # up. # # Fixes: ecb8ac8b1f14 ("mm/madvise: introduce process_madvise() syscall: an external memory hinting API") # Reported-by: Jann Horn <jannh@google.com> # Suggested-by: Jann Horn <jannh@google.com> # Signed-off-by: Minchan Kim <minchan@kernel.org> # Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> # < /opt/cross/kisskb/korg/gcc-9.3.0-nolibc/or1k-linux/bin/or1k-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-9.3.0-nolibc/or1k-linux/bin/or1k-linux-ld --version # < git log --format=%s --max-count=1 a68a0262abdaa251e12c53715f48e698a18ef402 # < make -s -j 24 ARCH=openrisc O=/kisskb/build/linus_or1ksim_defconfig_or32 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.3.0-nolibc/or1k-linux/bin/or1k-linux- or1ksim_defconfig # < make -s -j 24 ARCH=openrisc O=/kisskb/build/linus_or1ksim_defconfig_or32 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.3.0-nolibc/or1k-linux/bin/or1k-linux- help # make -s -j 24 ARCH=openrisc O=/kisskb/build/linus_or1ksim_defconfig_or32 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.3.0-nolibc/or1k-linux/bin/or1k-linux- olddefconfig # make -s -j 24 ARCH=openrisc O=/kisskb/build/linus_or1ksim_defconfig_or32 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.3.0-nolibc/or1k-linux/bin/or1k-linux- Completed OK # rm -rf /kisskb/build/linus_or1ksim_defconfig_or32 # Build took: 0:00:42.697445

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