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| author | Daniel Borkmann <daniel@iogearbox.net> | 2022-01-12 12:39:48 +0000 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2022-01-19 01:27:03 +0100 |
| commit | 37c8d4807d1b8b521b30310dce97f6695dc2c2c6 (patch) | |
| tree | 338441804d596c6fa819c214b8faa5046f74aaac /tools/testing/selftests/bpf/verifier | |
| parent | 722e4db3ae0d52b2e3801280afbe19cf2d188e91 (diff) | |
| download | lwn-37c8d4807d1b8b521b30310dce97f6695dc2c2c6.tar.gz lwn-37c8d4807d1b8b521b30310dce97f6695dc2c2c6.zip | |
bpf, selftests: Add ringbuf memory type confusion test
Add two tests, one which asserts that ring buffer memory can be passed to
other helpers for populating its entry area, and another one where verifier
rejects different type of memory passed to bpf_ringbuf_submit().
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools/testing/selftests/bpf/verifier')
| -rw-r--r-- | tools/testing/selftests/bpf/verifier/ringbuf.c | 33 | ||||
| -rw-r--r-- | tools/testing/selftests/bpf/verifier/spill_fill.c | 2 |
2 files changed, 33 insertions, 2 deletions
diff --git a/tools/testing/selftests/bpf/verifier/ringbuf.c b/tools/testing/selftests/bpf/verifier/ringbuf.c index 68cae6947cc4..b64d33e4833c 100644 --- a/tools/testing/selftests/bpf/verifier/ringbuf.c +++ b/tools/testing/selftests/bpf/verifier/ringbuf.c @@ -28,7 +28,7 @@ }, .fixup_map_ringbuf = { 1 }, .result = REJECT, - .errstr = "dereference of modified mem ptr R1", + .errstr = "dereference of modified alloc_mem ptr R1", }, { "ringbuf: invalid reservation offset 2", @@ -62,3 +62,34 @@ .result = REJECT, .errstr = "R7 min value is outside of the allowed memory range", }, +{ + "ringbuf: check passing rb mem to helpers", + .insns = { + BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), + /* reserve 8 byte ringbuf memory */ + BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0), + BPF_LD_MAP_FD(BPF_REG_1, 0), + BPF_MOV64_IMM(BPF_REG_2, 8), + BPF_MOV64_IMM(BPF_REG_3, 0), + BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_reserve), + BPF_MOV64_REG(BPF_REG_7, BPF_REG_0), + /* check whether the reservation was successful */ + BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1), + BPF_EXIT_INSN(), + /* pass allocated ring buffer memory to fib lookup */ + BPF_MOV64_REG(BPF_REG_1, BPF_REG_6), + BPF_MOV64_REG(BPF_REG_2, BPF_REG_0), + BPF_MOV64_IMM(BPF_REG_3, 8), + BPF_MOV64_IMM(BPF_REG_4, 0), + BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_fib_lookup), + /* submit the ringbuf memory */ + BPF_MOV64_REG(BPF_REG_1, BPF_REG_7), + BPF_MOV64_IMM(BPF_REG_2, 0), + BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_submit), + BPF_MOV64_IMM(BPF_REG_0, 0), + BPF_EXIT_INSN(), + }, + .fixup_map_ringbuf = { 2 }, + .prog_type = BPF_PROG_TYPE_XDP, + .result = ACCEPT, +}, diff --git a/tools/testing/selftests/bpf/verifier/spill_fill.c b/tools/testing/selftests/bpf/verifier/spill_fill.c index 1a8eb9672bd1..8cfc5349d2a8 100644 --- a/tools/testing/selftests/bpf/verifier/spill_fill.c +++ b/tools/testing/selftests/bpf/verifier/spill_fill.c @@ -84,7 +84,7 @@ }, .fixup_map_ringbuf = { 1 }, .result = REJECT, - .errstr = "R0 pointer arithmetic on mem_or_null prohibited", + .errstr = "R0 pointer arithmetic on alloc_mem_or_null prohibited", }, { "check corrupted spill/fill", |