# 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-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-gcc --version
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-ld --version
# < git log --format=%s --max-count=1 a68a0262abdaa251e12c53715f48e698a18ef402
# < make -s -j 10 ARCH=arm O=/kisskb/build/linus_multi_v7_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-  multi_v7_defconfig
# make -s -j 10 ARCH=arm O=/kisskb/build/linus_multi_v7_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-  
/kisskb/src/arch/arm/boot/dts/mmp2.dtsi:472.23-480.6: Warning (spi_bus_bridge): /soc/apb@d4000000/spi@d4037000: incorrect #address-cells for SPI bus
  also defined at /kisskb/src/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts:225.7-237.3
/kisskb/src/arch/arm/boot/dts/mmp2.dtsi:472.23-480.6: Warning (spi_bus_bridge): /soc/apb@d4000000/spi@d4037000: incorrect #size-cells for SPI bus
  also defined at /kisskb/src/arch/arm/boot/dts/mmp2-olpc-xo-1-75.dts:225.7-237.3
arch/arm/boot/dts/mmp2-olpc-xo-1-75.dtb: Warning (spi_bus_reg): Failed prerequisite 'spi_bus_bridge'
/kisskb/src/arch/arm/crypto/ghash-ce-glue.c: In function 'ghash_do_update':
/kisskb/src/arch/arm/crypto/ghash-ce-glue.c:67:44: warning: passing argument 4 of 'pmull_ghash_update_p64' from incompatible pointer type
    pmull_ghash_update_p64(blocks, dg, src, key->h, head);
                                            ^
/kisskb/src/arch/arm/crypto/ghash-ce-glue.c:45:17: note: expected 'const u64 (*)[2]' but argument is of type 'u64 (*)[2]'
 asmlinkage void pmull_ghash_update_p64(int blocks, u64 dg[], const char *src,
                 ^
/kisskb/src/arch/arm/crypto/ghash-ce-glue.c:69:43: warning: passing argument 4 of 'pmull_ghash_update_p8' from incompatible pointer type
    pmull_ghash_update_p8(blocks, dg, src, key->h, head);
                                           ^
/kisskb/src/arch/arm/crypto/ghash-ce-glue.c:48:17: note: expected 'const u64 (*)[2]' but argument is of type 'u64 (*)[2]'
 asmlinkage void pmull_ghash_update_p8(int blocks, u64 dg[], const char *src,
                 ^
/kisskb/src/drivers/firmware/qcom_scm-smc.c: In function 'scm_smc_call':
/kisskb/src/drivers/firmware/qcom_scm-smc.c:94:9: warning: missing braces around initializer [-Wmissing-braces]
  struct arm_smccc_args smc = {0};
         ^
/kisskb/src/drivers/firmware/qcom_scm-smc.c:94:9: warning: (near initialization for 'smc.args') [-Wmissing-braces]
/kisskb/src/drivers/firmware/qcom_scm-legacy.c: In function 'scm_legacy_call':
/kisskb/src/drivers/firmware/qcom_scm-legacy.c:139:9: warning: missing braces around initializer [-Wmissing-braces]
  struct arm_smccc_args smc = {0};
         ^
/kisskb/src/drivers/firmware/qcom_scm-legacy.c:139:9: warning: (near initialization for 'smc.args') [-Wmissing-braces]
Completed OK
# rm -rf /kisskb/build/linus_multi_v7_defconfig_arm-gcc4.9
# Build took: 0:04:59.479433