Buildresult: powerpc-next/ia64-defconfig/ia64-gcc4.6 built on May 11 2018, 18:12

kisskb

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Status:	OK
Date/Time:	May 11 2018, 18:12
Duration:	0:01:45.179055
Builder:	ka1
Revision:	powerpc: Check address limit on user-mode return (TIF_FSCHECK) (`ce63b04945771378f238ffd53ea665854aa27e20)`
Target:	powerpc-next/ia64-defconfig/ia64-gcc4.6
Branch:	powerpc-next
Compiler:	ia64-gcc4.6 (ia64-linux-gcc (GCC) 4.6.3)
Config:	defconfig (download)
Log:	Download original Possible warnings (14) <stdin>:1185:2: warning: #warning syscall perf_event_open not implemented [-Wcpp] <stdin>:1239:2: warning: #warning syscall seccomp not implemented [-Wcpp] <stdin>:1317:2: warning: #warning syscall pkey_mprotect not implemented [-Wcpp] <stdin>:1320:2: warning: #warning syscall pkey_alloc not implemented [-Wcpp] <stdin>:1323:2: warning: #warning syscall pkey_free not implemented [-Wcpp] <stdin>:1326:2: warning: #warning syscall statx not implemented [-Wcpp] kernel/printk/printk.c:183:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] kernel/cgroup/cgroup-v1.c:1268:20: warning: 'root' may be used uninitialized in this function [-Wuninitialized] mm/vmstat.c:89:5: warning: 'oldval' may be used uninitialized in this function [-Wuninitialized] kernel/fork.c:692:13: warning: 'task_struct_whitelist' defined but not used [-Wunused-function] mm/hugetlb.c:1433:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized] drivers/dma-buf/reservation.c:207:2: warning: 'k' may be used uninitialized in this function [-Wuninitialized] fs/nfsd/nfs4xdr.c:2041:9: warning: 'str' 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 ce63b04945771378f238ffd53ea665854aa27e20^{commit} ce63b04945771378f238ffd53ea665854aa27e20 already have revision, skipping fetch # git checkout -q -f -B kisskb ce63b04945771378f238ffd53ea665854aa27e20 # git clean -qxdf # < git log -1 # commit ce63b04945771378f238ffd53ea665854aa27e20 # Author: Michael Ellerman <mpe@ellerman.id.au> # Date: Wed Nov 22 12:15:42 2017 +1100 # # powerpc: Check address limit on user-mode return (TIF_FSCHECK) # # set_fs() sets the addr_limit, which is used in access_ok() to # determine if an address is a user or kernel address. # # Some code paths use set_fs() to temporarily elevate the addr_limit so # that kernel code can read/write kernel memory as if it were user # memory. That is fine as long as the code can't ever return to # userspace with the addr_limit still elevated. # # If that did happen, then userspace can read/write kernel memory as if # it were user memory, eg. just with write(2). In case it's not clear, # that is very bad. It has also happened in the past due to bugs. # # Commit 5ea0727b163c ("x86/syscalls: Check address limit on user-mode # return") added a mechanism to check the addr_limit value before # returning to userspace. Any call to set_fs() sets a thread flag, # TIF_FSCHECK, and if we see that on the return to userspace we go out # of line to check that the addr_limit value is not elevated. # # For further info see the above commit, as well as: # https://lwn.net/Articles/722267/ # https://bugs.chromium.org/p/project-zero/issues/detail?id=990 # # Verified to work on 64-bit Book3S using a POC that objdumps the system # call handler, and a modified lkdtm_CORRUPT_USER_DS() that doesn't kill # the caller. # # Before: # $ sudo ./test-tif-fscheck # ... # 0000000000000000 <.data>: # 0: e1 f7 8a 79 rldicl. r10,r12,30,63 # 4: 80 03 82 40 bne 0x384 # 8: 00 40 8a 71 andi. r10,r12,16384 # c: 78 0b 2a 7c mr r10,r1 # 10: 10 fd 21 38 addi r1,r1,-752 # 14: 08 00 c2 41 beq- 0x1c # 18: 58 09 2d e8 ld r1,2392(r13) # 1c: 00 00 41 f9 std r10,0(r1) # 20: 70 01 61 f9 std r11,368(r1) # 24: 78 01 81 f9 std r12,376(r1) # 28: 70 00 01 f8 std r0,112(r1) # 2c: 78 00 41 f9 std r10,120(r1) # 30: 20 00 82 41 beq 0x50 # 34: a6 42 4c 7d mftb r10 # # After: # # $ sudo ./test-tif-fscheck # Killed # # And in dmesg: # Invalid address limit on user-mode return # WARNING: CPU: 1 PID: 3689 at ../include/linux/syscalls.h:260 do_notify_resume+0x140/0x170 # ... # NIP [c00000000001ee50] do_notify_resume+0x140/0x170 # LR [c00000000001ee4c] do_notify_resume+0x13c/0x170 # Call Trace: # do_notify_resume+0x13c/0x170 (unreliable) # ret_from_except_lite+0x70/0x74 # # Performance overhead is essentially zero in the usual case, because # the bit is checked as part of the existing _TIF_USER_WORK_MASK check. # # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # < /opt/cross/kisskb/gcc-4.6.3-nolibc/ia64-linux/bin/ia64-linux-gcc --version # < git log --format=%s --max-count=1 ce63b04945771378f238ffd53ea665854aa27e20 # < make -s -j 48 ARCH=ia64 O=/kisskb/build/powerpc-next_ia64-defconfig_ia64 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/ia64-linux/bin/ia64-linux- defconfig # make -s -j 48 ARCH=ia64 O=/kisskb/build/powerpc-next_ia64-defconfig_ia64 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/ia64-linux/bin/ia64-linux- <stdin>:1185:2: warning: #warning syscall perf_event_open not implemented [-Wcpp] <stdin>:1239:2: warning: #warning syscall seccomp not implemented [-Wcpp] <stdin>:1317:2: warning: #warning syscall pkey_mprotect not implemented [-Wcpp] <stdin>:1320:2: warning: #warning syscall pkey_alloc not implemented [-Wcpp] <stdin>:1323:2: warning: #warning syscall pkey_free not implemented [-Wcpp] <stdin>:1326:2: warning: #warning syscall statx not implemented [-Wcpp] /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:183:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/kernel/cgroup/cgroup-v1.c: In function 'cgroup1_mount': /kisskb/src/kernel/cgroup/cgroup-v1.c:1268:20: warning: 'root' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/mm/vmstat.c: In function 'sysctl_vm_numa_stat_handler': /kisskb/src/mm/vmstat.c:89:5: warning: 'oldval' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/kernel/fork.c:692:13: warning: 'task_struct_whitelist' defined but not used [-Wunused-function] /kisskb/src/mm/hugetlb.c: In function 'alloc_pool_huge_page': /kisskb/src/mm/hugetlb.c:1433:5: warning: 'page' 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:207:2: warning: 'k' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/dma-buf/reservation.c:160:17: note: 'k' was declared here /kisskb/src/fs/nfsd/nfs4xdr.c: In function 'nfsd4_encode_components_esc': /kisskb/src/fs/nfsd/nfs4xdr.c:2041:9: warning: 'str' 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:340:21: note: 'pdeo' was declared here No errors detected in 21132 functions. Kernel: vmlinux.gz is ready Completed OK # rm -rf /kisskb/build/powerpc-next_ia64-defconfig_ia64 # Build took: 0:01:45.179055

© Michael Ellerman 2006-2018.