diff options
| author | John Fastabend <john.fastabend@gmail.com> | 2021-08-05 18:53:42 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-08-08 09:04:09 +0200 |
| commit | d3796e8f6b3d25c74e416ec3eb0efc011acb547c (patch) | |
| tree | fdfca9085212f40f4f2b43f852444418e4dcb71a | |
| parent | 8dec99abcd74b817666f48645fe54fc759163e52 (diff) | |
bpf, selftests: Add a verifier test for assigning 32bit reg states to 64bit ones
commit cf66c29bd7534813d2e1971fab71e25fe87c7e0a upstream
Added a verifier test for assigning 32bit reg states to
64bit where 32bit reg holds a constant value of 0.
Without previous kernel verifier.c fix, the test in
this patch will fail.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/159077335867.6014.2075350327073125374.stgit@john-Precision-5820-Tower
Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | tools/testing/selftests/bpf/verifier/bounds.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/verifier/bounds.c b/tools/testing/selftests/bpf/verifier/bounds.c index d8e5388c9ba7..c42ce135786a 100644 --- a/tools/testing/selftests/bpf/verifier/bounds.c +++ b/tools/testing/selftests/bpf/verifier/bounds.c @@ -545,3 +545,25 @@ }, .result = ACCEPT }, +{ + "assigning 32bit bounds to 64bit for wA = 0, wB = wA", + .insns = { + BPF_LDX_MEM(BPF_W, BPF_REG_8, BPF_REG_1, + offsetof(struct __sk_buff, data_end)), + BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1, + offsetof(struct __sk_buff, data)), + BPF_MOV32_IMM(BPF_REG_9, 0), + BPF_MOV32_REG(BPF_REG_2, BPF_REG_9), + BPF_MOV64_REG(BPF_REG_6, BPF_REG_7), + BPF_ALU64_REG(BPF_ADD, BPF_REG_6, BPF_REG_2), + BPF_MOV64_REG(BPF_REG_3, BPF_REG_6), + BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 8), + BPF_JMP_REG(BPF_JGT, BPF_REG_3, BPF_REG_8, 1), + BPF_LDX_MEM(BPF_W, BPF_REG_5, BPF_REG_6, 0), + BPF_MOV64_IMM(BPF_REG_0, 0), + BPF_EXIT_INSN(), + }, + .prog_type = BPF_PROG_TYPE_SCHED_CLS, + .result = ACCEPT, + .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS, +}, |