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linux/tools/testing/selftests/bpf/verifier/map_ptr.c

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selftests/bpf: Test access to bpf map pointer Add selftests to test access to map pointers from bpf program for all map types except struct_ops (that one would need additional work). verifier test focuses mostly on scenarios that must be rejected. prog_tests test focuses on accessing multiple fields both scalar and a nested struct from bpf program and verifies that those fields have expected values. Signed-off-by: Andrey Ignatov <rdna@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Martin KaFai Lau <kafai@fb.com> Link: https://lore.kernel.org/bpf/139a6a17f8016491e39347849b951525335c6eb4.1592600985.git.rdna@fb.com
2020-06-19 14:11:45 -07:00
{
"bpf_map_ptr: read with negative offset rejected",
.insns = {
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_LDX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, -8),
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_EXIT_INSN(),
},
.fixup_map_array_48b = { 1 },
.result_unpriv = REJECT,
.errstr_unpriv = "bpf_array access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN",
.result = REJECT,
.errstr = "R1 is bpf_array invalid negative access: off=-8",
},
{
"bpf_map_ptr: write rejected",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_2, 0),
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_EXIT_INSN(),
},
.fixup_map_array_48b = { 3 },
.result_unpriv = REJECT,
.errstr_unpriv = "bpf_array access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN",
.result = REJECT,
.errstr = "only read from bpf_array is supported",
},
{
"bpf_map_ptr: read non-existent field rejected",
.insns = {
BPF_MOV64_IMM(BPF_REG_6, 0),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1, 1),
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_EXIT_INSN(),
},
.fixup_map_array_48b = { 1 },
.result_unpriv = REJECT,
.errstr_unpriv = "bpf_array access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN",
.result = REJECT,
.errstr = "cannot access ptr member ops with moff 0 in struct bpf_map with off 1 size 4",
selftests/bpf: Mark tests that require unaligned memory access A lot of tests require unaligned memory access to work. Mark the tests as such, so that they can be avoided on unsupported architectures such as RISC-V. Signed-off-by: Björn Töpel <bjorn.topel@gmail.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Luke Nelson <luke.r.nels@gmail.com> Link: https://lore.kernel.org/bpf/20201118071640.83773-4-bjorn.topel@gmail.com
2020-11-18 08:16:40 +01:00
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
selftests/bpf: Test access to bpf map pointer Add selftests to test access to map pointers from bpf program for all map types except struct_ops (that one would need additional work). verifier test focuses mostly on scenarios that must be rejected. prog_tests test focuses on accessing multiple fields both scalar and a nested struct from bpf program and verifies that those fields have expected values. Signed-off-by: Andrey Ignatov <rdna@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Martin KaFai Lau <kafai@fb.com> Link: https://lore.kernel.org/bpf/139a6a17f8016491e39347849b951525335c6eb4.1592600985.git.rdna@fb.com
2020-06-19 14:11:45 -07:00
},
{
"bpf_map_ptr: read ops field accepted",
.insns = {
BPF_MOV64_IMM(BPF_REG_6, 0),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_LDX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 0),
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_EXIT_INSN(),
},
.fixup_map_array_48b = { 1 },
.result_unpriv = REJECT,
.errstr_unpriv = "bpf_array access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN",
.result = ACCEPT,
.retval = 1,
},
selftests/bpf: Add test for map_ptr arithmetic Change selftest map_ptr_kern.c with disabling inlining for one of subtests, which will fail the test without previous verifier change. Also added to verifier test for both "map_ptr += scalar" and "scalar += map_ptr" arithmetic. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20200908175703.2463721-1-yhs@fb.com
2020-09-08 10:57:03 -07:00
{
"bpf_map_ptr: r = 0, map_ptr = map_ptr + r",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_16b = { 4 },
.result = ACCEPT,
},
{
"bpf_map_ptr: r = 0, r = r + map_ptr",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_MOV64_IMM(BPF_REG_1, 0),
BPF_LD_MAP_FD(BPF_REG_0, 0),
BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_16b = { 4 },
.result = ACCEPT,
},
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