Buildresult: powerpc-next/mpc85xx_basic_defconfig/powerpc-gcc4.6 built on Feb 6 2019, 01:11

kisskb

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Status:	OK
Date/Time:	Feb 6 2019, 01:11
Duration:	0:00:23.027229
Builder:	ka3
Revision:	powerpc/ptrace: Mitigate potential Spectre v1 (`7e1ed4da4a16e035a76001461fbd75c453b73206)`
Target:	powerpc-next/mpc85xx_basic_defconfig/powerpc-gcc4.6
Branch:	powerpc-next
Compiler:	powerpc-gcc4.6 (powerpc-linux-gcc (GCC) 4.6.3 / GNU ld (GNU Binutils) 2.22)
Config:	mpc85xx_basic_defconfig (download)
Log:	Download original Possible warnings (2) kernel/printk/printk.c:186:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] Full Log # git rev-parse -q --verify 7e1ed4da4a16e035a76001461fbd75c453b73206^{commit} 7e1ed4da4a16e035a76001461fbd75c453b73206 already have revision, skipping fetch # git checkout -q -f -B kisskb 7e1ed4da4a16e035a76001461fbd75c453b73206 # git clean -qxdf # < git log -1 # commit 7e1ed4da4a16e035a76001461fbd75c453b73206 # Author: Breno Leitao <leitao@debian.org> # Date: Wed Jan 30 10:46:00 2019 -0200 # # powerpc/ptrace: Mitigate potential Spectre v1 # # 'regno' is directly controlled by user space, hence leading to a potential # exploitation of the Spectre variant 1 vulnerability. # # On PTRACE_SETREGS and PTRACE_GETREGS requests, user space passes the # register number that would be read or written. This register number is # called 'regno' which is part of the 'addr' syscall parameter. # # This 'regno' value is checked against the maximum pt_regs structure size, # and then used to dereference it, which matches the initial part of a # Spectre v1 (and Spectre v1.1) attack. The dereferenced value, then, # is returned to userspace in the GETREGS case. # # This patch sanitizes 'regno' before using it to dereference pt_reg. # # Notice that given that speculation windows are large, the policy is # to kill the speculation on the first load and not worry if it can be # completed with a dependent load/store [1]. # # [1] https://marc.info/?l=linux-kernel&m=152449131114778&w=2 # # Signed-off-by: Breno Leitao <leitao@debian.org> # Acked-by: Gustavo A. R. Silva <gustavo@embeddedor.com> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version # < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-ld --version # < git log --format=%s --max-count=1 7e1ed4da4a16e035a76001461fbd75c453b73206 # < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next_mpc85xx_basic_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- mpc85xx_basic_defconfig # make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next_mpc85xx_basic_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:186:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/proc/inode.c: In function 'proc_reg_open': /kisskb/src/include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/proc/inode.c:339:21: note: 'pdeo' was declared here Completed OK # rm -rf /kisskb/build/powerpc-next_mpc85xx_basic_defconfig_powerpc-gcc4.6 # Build took: 0:00:23.027229

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