Buildresult: powerpc-fixes/corenet_basic_defconfig/powerpc-gcc4.6 built on Jul 20 2019, 01:00

kisskb

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Status:	OK
Date/Time:	Jul 20 2019, 01:00
Duration:	0:00:25.002606
Builder:	ka1
Revision:	powerpc/tm: Fix oops on sigreturn on systems without TM (`c7ce5fe9288c5692fa456a804cf5ea5976d842f1)`
Target:	powerpc-fixes/corenet_basic_defconfig/powerpc-gcc4.6
Branch:	powerpc-fixes
Compiler:	powerpc-gcc4.6 (powerpc-linux-gcc (GCC) 4.6.3 / GNU ld (GNU Binutils) 2.22)
Config:	corenet_basic_defconfig (download)
Log:	Download original Possible warnings (4) <stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp] kernel/printk/printk.c:194:16: 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] kernel/futex.c:1676:3: warning: 'oldval' may be used uninitialized in this function [-Wuninitialized] Full Log # git rev-parse -q --verify c7ce5fe9288c5692fa456a804cf5ea5976d842f1^{commit} c7ce5fe9288c5692fa456a804cf5ea5976d842f1 already have revision, skipping fetch # git checkout -q -f -B kisskb c7ce5fe9288c5692fa456a804cf5ea5976d842f1 # git clean -qxdf # < git log -1 # commit c7ce5fe9288c5692fa456a804cf5ea5976d842f1 # Author: Michael Neuling <mikey@neuling.org> # Date: Fri Jul 19 15:05:02 2019 +1000 # # powerpc/tm: Fix oops on sigreturn on systems without TM # # On systems like P9 powernv where we have no TM (or P8 booted with # ppc_tm=off), userspace can construct a signal context which still has # the MSR TS bits set. The kernel tries to restore this context which # results in the following crash: # # Unexpected TM Bad Thing exception at c0000000000022fc (msr 0x8000000102a03031) tm_scratch=800000020280f033 # Oops: Unrecoverable exception, sig: 6 [#1] # LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries # Modules linked in: # CPU: 0 PID: 1636 Comm: sigfuz Not tainted 5.2.0-11043-g0a8ad0ffa4 #69 # NIP: c0000000000022fc LR: 00007fffb2d67e48 CTR: 0000000000000000 # REGS: c00000003fffbd70 TRAP: 0700 Not tainted (5.2.0-11045-g7142b497d8) # MSR: 8000000102a03031 <SF,VEC,VSX,FP,ME,IR,DR,LE,TM[E]> CR: 42004242 XER: 00000000 # CFAR: c0000000000022e0 IRQMASK: 0 # GPR00: 0000000000000072 00007fffb2b6e560 00007fffb2d87f00 0000000000000669 # GPR04: 00007fffb2b6e728 0000000000000000 0000000000000000 00007fffb2b6f2a8 # GPR08: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 # GPR12: 0000000000000000 00007fffb2b76900 0000000000000000 0000000000000000 # GPR16: 00007fffb2370000 00007fffb2d84390 00007fffea3a15ac 000001000a250420 # GPR20: 00007fffb2b6f260 0000000010001770 0000000000000000 0000000000000000 # GPR24: 00007fffb2d843a0 00007fffea3a14a0 0000000000010000 0000000000800000 # GPR28: 00007fffea3a14d8 00000000003d0f00 0000000000000000 00007fffb2b6e728 # NIP [c0000000000022fc] rfi_flush_fallback+0x7c/0x80 # LR [00007fffb2d67e48] 0x7fffb2d67e48 # Call Trace: # Instruction dump: # e96a0220 e96a02a8 e96a0330 e96a03b8 394a0400 4200ffdc 7d2903a6 e92d0c00 # e94d0c08 e96d0c10 e82d0c18 7db242a6 <4c000024> 7db243a6 7db142a6 f82d0c18 # # The problem is the signal code assumes TM is enabled when # CONFIG_PPC_TRANSACTIONAL_MEM is enabled. This may not be the case as # with P9 powernv or if `ppc_tm=off` is used on P8. # # This means any local user can crash the system. # # Fix the problem by returning a bad stack frame to the user if they try # to set the MSR TS bits with sigreturn() on systems where TM is not # supported. # # Found with sigfuz kernel selftest on P9. # # This fixes CVE-2019-13648. # # Fixes: 2b0a576d15e0 ("powerpc: Add new transactional memory state to the signal context") # # NOTE: fixes commit 2b0a576d15e0 released in v3.9. # # Consider a stable tag: # # Cc: stable@vger.kernel.org # v3.9+ # Cc: stable@vger.kernel.org # v3.9 # Reported-by: Praveen Pandey <Praveen.Pandey@in.ibm.com> # Signed-off-by: Michael Neuling <mikey@neuling.org> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # Link: https://lore.kernel.org/r/20190719050502.405-1-mikey@neuling.org # < /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 c7ce5fe9288c5692fa456a804cf5ea5976d842f1 # < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_corenet_basic_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- corenet_basic_defconfig # make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_corenet_basic_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- <stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp] /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:194:16: 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:331:21: note: 'pdeo' was declared here /kisskb/src/kernel/futex.c: In function 'do_futex': /kisskb/src/kernel/futex.c:1676:3: warning: 'oldval' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/kernel/futex.c:1651:6: note: 'oldval' was declared here Completed OK # rm -rf /kisskb/build/powerpc-fixes_corenet_basic_defconfig_powerpc-gcc4.6 # Build took: 0:00:25.002606

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