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authorYonghong Song <yhs@fb.com>2017-11-21 11:23:40 -0800
committerDaniel Borkmann <daniel@iogearbox.net>2017-11-21 21:23:05 +0100
commitf1a8b8e3d98b0b3d1d88d119f52cc85d05ab3189 (patch)
tree9634bc10802301580cdb1c4771a04213de4d06df
parent6547f424be5d9d75c78c146ed6e9f71be1c43981 (diff)
downloadop-kernel-dev-f1a8b8e3d98b0b3d1d88d119f52cc85d05ab3189.zip
op-kernel-dev-f1a8b8e3d98b0b3d1d88d119f52cc85d05ab3189.tar.gz
bpf: change bpf_probe_write_user to bpf_trace_printk in test_verifier
There are four tests in test_verifier using bpf_probe_write_user helper. These four tests will emit the following kernel messages [ 12.974753] test_verifier[220] is installing a program with bpf_probe_write_user helper that may corrupt user memory! [ 12.979285] test_verifier[220] is installing a program with bpf_probe_write_user helper that may corrupt user memory! ...... This may confuse certain users. This patch replaces bpf_probe_write_user with bpf_trace_printk. The test_verifier already uses bpf_trace_printk earlier in the test and a trace_printk warning message has been printed. So this patch does not emit any more kernel messages. Fixes: b6ff63911232 ("bpf: fix and add test cases for ARG_CONST_SIZE_OR_ZERO semantics change") Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
-rw-r--r--tools/testing/selftests/bpf/test_verifier.c39
1 files changed, 16 insertions, 23 deletions
diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index bf092b8..2a5267b 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -4377,11 +4377,10 @@ static struct bpf_test tests[] = {
BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
- BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 4),
- BPF_MOV64_IMM(BPF_REG_1, 0),
- BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
- BPF_MOV64_IMM(BPF_REG_3, 0),
- BPF_EMIT_CALL(BPF_FUNC_probe_write_user),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 3),
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+ BPF_MOV64_IMM(BPF_REG_2, 0),
+ BPF_EMIT_CALL(BPF_FUNC_trace_printk),
BPF_EXIT_INSN(),
},
.fixup_map2 = { 3 },
@@ -4481,14 +4480,12 @@ static struct bpf_test tests[] = {
BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
- BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 5),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 4),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1,
offsetof(struct test_val, foo)),
- BPF_MOV64_REG(BPF_REG_2, BPF_REG_1),
- BPF_MOV64_IMM(BPF_REG_1, 0),
- BPF_MOV64_IMM(BPF_REG_3, 0),
- BPF_EMIT_CALL(BPF_FUNC_probe_write_user),
+ BPF_MOV64_IMM(BPF_REG_2, 0),
+ BPF_EMIT_CALL(BPF_FUNC_trace_printk),
BPF_EXIT_INSN(),
},
.fixup_map2 = { 3 },
@@ -4618,18 +4615,16 @@ static struct bpf_test tests[] = {
BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
- BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 5),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_MOV64_IMM(BPF_REG_3, 0),
BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_3),
- BPF_MOV64_REG(BPF_REG_2, BPF_REG_1),
- BPF_MOV64_IMM(BPF_REG_1, 0),
- BPF_MOV64_IMM(BPF_REG_3, 0),
- BPF_EMIT_CALL(BPF_FUNC_probe_write_user),
+ BPF_MOV64_IMM(BPF_REG_2, 0),
+ BPF_EMIT_CALL(BPF_FUNC_trace_printk),
BPF_EXIT_INSN(),
},
.fixup_map2 = { 3 },
- .errstr = "R2 min value is outside of the array range",
+ .errstr = "R1 min value is outside of the array range",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
},
@@ -4760,20 +4755,18 @@ static struct bpf_test tests[] = {
BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
- BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 7),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_0, 0),
BPF_JMP_IMM(BPF_JGT, BPF_REG_3,
- offsetof(struct test_val, foo), 4),
+ offsetof(struct test_val, foo), 3),
BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_3),
- BPF_MOV64_REG(BPF_REG_2, BPF_REG_1),
- BPF_MOV64_IMM(BPF_REG_1, 0),
- BPF_MOV64_IMM(BPF_REG_3, 0),
- BPF_EMIT_CALL(BPF_FUNC_probe_write_user),
+ BPF_MOV64_IMM(BPF_REG_2, 0),
+ BPF_EMIT_CALL(BPF_FUNC_trace_printk),
BPF_EXIT_INSN(),
},
.fixup_map2 = { 3 },
- .errstr = "R2 min value is outside of the array range",
+ .errstr = "R1 min value is outside of the array range",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
},
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