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-rw-r--r--tools/testing/selftests/bpf/test_verifier.c58
1 files changed, 57 insertions, 1 deletions
diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index 7cb1d74057ce..2ecd27b670d7 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -8647,7 +8647,7 @@ static struct bpf_test tests[] = {
offsetof(struct __sk_buff, mark)),
BPF_EXIT_INSN(),
},
- .errstr = "dereference of modified ctx ptr R1 off=68+8, ctx+const is allowed, ctx+const+const is not",
+ .errstr = "dereference of modified ctx ptr",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
},
@@ -12258,6 +12258,62 @@ static struct bpf_test tests[] = {
.result = ACCEPT,
.retval = 5,
},
+ {
+ "pass unmodified ctx pointer to helper",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_2, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+ BPF_FUNC_csum_update),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ .result = ACCEPT,
+ },
+ {
+ "pass modified ctx pointer to helper, 1",
+ .insns = {
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -612),
+ BPF_MOV64_IMM(BPF_REG_2, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+ BPF_FUNC_csum_update),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ .result = REJECT,
+ .errstr = "dereference of modified ctx ptr",
+ },
+ {
+ "pass modified ctx pointer to helper, 2",
+ .insns = {
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -612),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+ BPF_FUNC_get_socket_cookie),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result_unpriv = REJECT,
+ .result = REJECT,
+ .errstr_unpriv = "dereference of modified ctx ptr",
+ .errstr = "dereference of modified ctx ptr",
+ },
+ {
+ "pass modified ctx pointer to helper, 3",
+ .insns = {
+ BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1, 0),
+ BPF_ALU64_IMM(BPF_AND, BPF_REG_3, 4),
+ BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_3),
+ BPF_MOV64_IMM(BPF_REG_2, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+ BPF_FUNC_csum_update),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ .result = REJECT,
+ .errstr = "variable ctx access var_off=(0x0; 0x4)",
+ },
};
static int probe_filter_length(const struct bpf_insn *fp)