Buildresult: powerpc-next/versatile_defconfig/arm-gcc4.6 built on Dec 13 2018, 02:56

kisskb

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Status:	OK
Date/Time:	Dec 13 2018, 02:56
Duration:	0:00:43.288489
Builder:	ka3
Revision:	powerpc/mm/hash: Handle user access of kernel address gracefully (`61a8426c92ba30d403a1f072e29d713184539cc1)`
Target:	powerpc-next/versatile_defconfig/arm-gcc4.6
Branch:	powerpc-next
Compiler:	arm-gcc4.6 (arm-unknown-linux-gnueabi-gcc (GCC) 4.6.3)
Config:	versatile_defconfig (download)
Log:	Download original Possible warnings (6) 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] drivers/base/regmap/regmap.c:2594:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] drivers/base/regmap/regmap.c:1855:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] drivers/dma-buf/reservation.c:226:6: warning: 'k' may be used uninitialized in this function [-Wuninitialized] drivers/i2c/i2c-core-base.c:235:5: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] Full Log # git rev-parse -q --verify 61a8426c92ba30d403a1f072e29d713184539cc1^{commit} 61a8426c92ba30d403a1f072e29d713184539cc1 already have revision, skipping fetch # git checkout -q -f -B kisskb 61a8426c92ba30d403a1f072e29d713184539cc1 # git clean -qxdf # < git log -1 # commit 61a8426c92ba30d403a1f072e29d713184539cc1 # Author: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> # Date: Mon Nov 26 20:05:04 2018 +0530 # # powerpc/mm/hash: Handle user access of kernel address gracefully # # In commit 2865d08dd9ea ("powerpc/mm: Move the DSISR_PROTFAULT sanity # check") we moved the protection fault access check before the vma # lookup. That means we hit that WARN_ON when user space accesses a # kernel address. Before that commit this was handled by find_vma() not # finding vma for the kernel address and considering that access as bad # area access. # # Avoid the confusing WARN_ON and convert that to a ratelimited printk. # # With the patch we now get: # # for load: # a.out[5997]: User access of kernel address (c00000000000dea0) - exploit attempt? (uid: 1000) # a.out[5997]: segfault (11) at c00000000000dea0 nip 1317c0798 lr 7fff80d6441c code 1 in a.out[1317c0000+10000] # a.out[5997]: code: 60000000 60420000 3c4c0002 38427790 4bffff20 3c4c0002 38427784 fbe1fff8 # a.out[5997]: code: f821ffc1 7c3f0b78 60000000 e9228030 <89290000> 993f002f 60000000 383f0040 # # for exec: # a.out[6067]: User access of kernel address (c00000000000dea0) - exploit attempt? (uid: 1000) # a.out[6067]: segfault (11) at c00000000000dea0 nip c00000000000dea0 lr 129d507b0 code 1 # a.out[6067]: Bad NIP, not dumping instructions. # # Fixes: 2865d08dd9ea ("powerpc/mm: Move the DSISR_PROTFAULT sanity check") # Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> # Tested-by: Breno Leitao <leitao@debian.org> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # < /opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-gcc --version # < git log --format=%s --max-count=1 61a8426c92ba30d403a1f072e29d713184539cc1 # < make -s -j 80 ARCH=arm O=/kisskb/build/powerpc-next_versatile_defconfig_arm CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi- versatile_defconfig # make -s -j 80 ARCH=arm O=/kisskb/build/powerpc-next_versatile_defconfig_arm CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi- /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:341:21: note: 'pdeo' was declared here /kisskb/src/drivers/base/regmap/regmap.c: In function 'regmap_raw_read': /kisskb/src/drivers/base/regmap/regmap.c:2594:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/base/regmap/regmap.c: In function '_regmap_raw_write': /kisskb/src/drivers/base/regmap/regmap.c:1855:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/dma-buf/reservation.c: In function 'reservation_object_add_shared_fence': /kisskb/src/drivers/dma-buf/reservation.c:226:6: warning: 'k' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/i2c/i2c-core-base.c: In function 'i2c_generic_scl_recovery': /kisskb/src/drivers/i2c/i2c-core-base.c:235:5: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] Completed OK # rm -rf /kisskb/build/powerpc-next_versatile_defconfig_arm # Build took: 0:00:43.288489

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