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Message-ID: <20171227030030.GJ3172@yexl-desktop> Date: Wed, 27 Dec 2017 11:00:30 +0800 From: kernel test robot <xiaolong.ye@...el.com> To: Alexei Starovoitov <ast@...nel.org> Cc: Daniel Borkmann <daniel@...earbox.net>, LKML <linux-kernel@...r.kernel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, lkp@...org Subject: [lkp-robot] [bpf] 82abbf8d2f: kernel_selftests.bpf.test_align.fail FYI, we noticed the following commit (built with gcc-7): commit: 82abbf8d2fc46d79611ab58daa7c608df14bb3ee ("bpf: do not allow root to mangle valid pointers") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master in testcase: kernel_selftests with following parameters: test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel. test-url: https://www.kernel.org/doc/Documentation/kselftest.txt on test machine: qemu-system-x86_64 -enable-kvm -cpu host -smp 2 -m 4G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): selftests: test_align ======================================== Test 0: mov ... PASS Test 1: shift ... PASS Test 2: addsub ... PASS Test 3: mul ... PASS Test 4: unknown shift ... PASS Test 5: unknown mul ... PASS Test 6: packet const offset ... PASS Test 7: packet variable offset ... PASS Test 8: packet variable offset 2 ... PASS Test 9: dubious pointer arithmetic ... Failed to find line 5 for match: R5=inv(id=0,umax_value=64,var_off=(0x0; 0x40)) 0: R1=ctx(id=0,off=0,imm=0) R10=fp0 0: (61) r2 = *(u32 *)(r1 +76) 1: R1=ctx(id=0,off=0,imm=0) R2=pkt(id=0,off=0,r=0,imm=0) R10=fp0 1: (61) r3 = *(u32 *)(r1 +80) 2: R1=ctx(id=0,off=0,imm=0) R2=pkt(id=0,off=0,r=0,imm=0) R3=pkt_end(id=0,off=0,imm=0) R10=fp0 2: (b7) r0 = 0 3: R0=inv0 R1=ctx(id=0,off=0,imm=0) R2=pkt(id=0,off=0,r=0,imm=0) R3=pkt_end(id=0,off=0,imm=0) R10=fp0 3: (bf) r5 = r2 4: R0=inv0 R1=ctx(id=0,off=0,imm=0) R2=pkt(id=0,off=0,r=0,imm=0) R3=pkt_end(id=0,off=0,imm=0) R5=pkt(id=0,off=0,r=0,imm=0) R10=fp0 4: (57) r5 &= 64 R5 bitwise operator &= on pointer prohibited FAIL Test 10: variable subtraction ... PASS Test 11: pointer variable subtraction ... PASS Results: 11 pass 1 fail not ok 1..7 selftests: test_align [FAIL] selftests: test_verifier_log ======================================== Test log_level 0... Test log_size < 128... Test log_buff = NULL... Test oversized buffer... Test exact buffer... Test undersized buffers... test_verifier_log: OK ok 1..8 selftests: test_verifier_log [PASS] selftests: test_dev_cgroup ======================================== libbpf: load bpf program failed: Permission denied libbpf: -- BEGIN DUMP LOG --- libbpf: 0: (61) r2 = *(u32 *)(r1 +4) 1: (b7) r0 = 0 2: (55) if r2 != 0x1 goto pc+8 R0=inv0 R1=ctx(id=0,off=0,imm=0) R2=inv1 R10=fp0 3: (69) r2 = *(u16 *)(r1 +0) invalid bpf_context access off=0 size=2 libbpf: -- END LOG -- libbpf: failed to load program 'cgroup/dev' libbpf: failed to load object './dev_cgroup.o' (/usr/src/linux-selftests-x86_64-rhel-7.2-82abbf8d2fc46d79611ab58daa7c608df14bb3ee/tools/testing/selftests/bpf/cgroup_helpers.c:96: errno: No such file or directory) Opening Cgroup Procs: /mnt/cgroup.procs Failed to load DEV_CGROUP program not ok 1..9 selftests: test_dev_cgroup [FAIL] selftests: test_kmod.sh ======================================== [ JIT enabled:0 hardened:0 ] [ 134.236248] FAIL [ 134.239508] not ok 1..7 selftests: test_align [FAIL] [ 134.264552] not ok 1..9 selftests: test_dev_cgroup [FAIL] [ 139.352274] test_bpf: Summary: 342 PASSED, 0 FAILED, [0/334 JIT'ed] [ JIT enabled:1 hardened:0 ] [ 139.376630] [ 134.264552] not ok 1..9 selftests: test_dev_cgroup [FAIL] [ 139.383832] [ 139.352274] test_bpf: Summary: 342 PASSED, 0 FAILED, [0/334 JIT'ed] [ 142.448376] test_bpf: Summary: 342 PASSED, 0 FAILED, [333/334 JIT'ed] [ JIT enabled:1 hardened:1 ] [ 145.505579] test_bpf: Summary: 342 PASSED, 0 FAILED, [333/334 JIT'ed] [ JIT enabled:1 hardened:2 ] [ 149.611957] test_bpf: Summary: 342 PASSED, 0 FAILED, [333/334 JIT'ed] ok 1..10 selftests: test_kmod.sh [PASS] To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email Thanks, Xiaolong View attachment "config-4.15.0-rc3-00323-g82abbf8" of type "text/plain" (164404 bytes) View attachment "job-script" of type "text/plain" (5431 bytes) Download attachment "dmesg.xz" of type "application/x-xz" (98148 bytes) View attachment "kernel_selftests" of type "text/plain" (242594 bytes)
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