b1b53d413f
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
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
{
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"bpf_map_ptr: read with negative offset rejected",
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.insns = {
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
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BPF_LD_MAP_FD(BPF_REG_1, 0),
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BPF_LDX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, -8),
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BPF_MOV64_IMM(BPF_REG_0, 1),
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BPF_EXIT_INSN(),
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},
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.fixup_map_array_48b = { 1 },
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.result_unpriv = REJECT,
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.errstr_unpriv = "bpf_array access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN",
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.result = REJECT,
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.errstr = "R1 is bpf_array invalid negative access: off=-8",
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},
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{
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"bpf_map_ptr: write rejected",
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.insns = {
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BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
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BPF_LD_MAP_FD(BPF_REG_1, 0),
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BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_2, 0),
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BPF_MOV64_IMM(BPF_REG_0, 1),
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BPF_EXIT_INSN(),
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},
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.fixup_map_array_48b = { 3 },
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.result_unpriv = REJECT,
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.errstr_unpriv = "bpf_array access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN",
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.result = REJECT,
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.errstr = "only read from bpf_array is supported",
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},
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{
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"bpf_map_ptr: read non-existent field rejected",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_6, 0),
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BPF_LD_MAP_FD(BPF_REG_1, 0),
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BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1, 1),
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BPF_MOV64_IMM(BPF_REG_0, 1),
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BPF_EXIT_INSN(),
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},
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.fixup_map_array_48b = { 1 },
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.result_unpriv = REJECT,
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.errstr_unpriv = "bpf_array access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN",
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.result = REJECT,
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.errstr = "cannot access ptr member ops with moff 0 in struct bpf_map with off 1 size 4",
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},
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{
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"bpf_map_ptr: read ops field accepted",
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.insns = {
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BPF_MOV64_IMM(BPF_REG_6, 0),
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BPF_LD_MAP_FD(BPF_REG_1, 0),
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BPF_LDX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 0),
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BPF_MOV64_IMM(BPF_REG_0, 1),
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BPF_EXIT_INSN(),
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},
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.fixup_map_array_48b = { 1 },
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.result_unpriv = REJECT,
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.errstr_unpriv = "bpf_array access is allowed only to CAP_PERFMON and CAP_SYS_ADMIN",
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.result = ACCEPT,
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.retval = 1,
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},
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