selftests/bpf: Test file_pos field in bpf_sysctl ctx (9a1027e5) · Commits · 戴 / test

tools/testing/selftests/bpf/test_sysctl.c

+64 −0

Original line number	Diff line number	Diff line
		@@ -30,6 +30,7 @@ struct sysctl_test {
		const char *sysctl;
		int open_flags;
		const char *newval;
		const char *oldval;
		enum {
		LOAD_REJECT,
		ATTACH_REJECT,
		@@ -130,6 +131,64 @@ static struct sysctl_test tests[] = {
		.open_flags = O_RDONLY,
		.result = LOAD_REJECT,
		},
		{
		.descr = "ctx:file_pos sysctl:read read ok",
		.insns = {
		/* If (file_pos == X) */
		BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,
		offsetof(struct bpf_sysctl, file_pos)),
		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, 0, 2),

		/* return ALLOW; */
		BPF_MOV64_IMM(BPF_REG_0, 1),
		BPF_JMP_A(1),

		/* else return DENY; */
		BPF_MOV64_IMM(BPF_REG_0, 0),
		BPF_EXIT_INSN(),
		},
		.attach_type = BPF_CGROUP_SYSCTL,
		.sysctl = "kernel/ostype",
		.open_flags = O_RDONLY,
		.result = SUCCESS,
		},
		{
		.descr = "ctx:file_pos sysctl:read read ok narrow",
		.insns = {
		/* If (file_pos == X) */
		BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_1,
		offsetof(struct bpf_sysctl, file_pos)),
		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, 0, 2),

		/* return ALLOW; */
		BPF_MOV64_IMM(BPF_REG_0, 1),
		BPF_JMP_A(1),

		/* else return DENY; */
		BPF_MOV64_IMM(BPF_REG_0, 0),
		BPF_EXIT_INSN(),
		},
		.attach_type = BPF_CGROUP_SYSCTL,
		.sysctl = "kernel/ostype",
		.open_flags = O_RDONLY,
		.result = SUCCESS,
		},
		{
		.descr = "ctx:file_pos sysctl:read write ok",
		.insns = {
		/* file_pos = X */
		BPF_MOV64_IMM(BPF_REG_0, 2),
		BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_0,
		offsetof(struct bpf_sysctl, file_pos)),
		BPF_MOV64_IMM(BPF_REG_0, 1),
		BPF_EXIT_INSN(),
		},
		.attach_type = BPF_CGROUP_SYSCTL,
		.sysctl = "kernel/ostype",
		.open_flags = O_RDONLY,
		.oldval = "nux\n",
		.result = SUCCESS,
		},
		{
		.descr = "sysctl_get_name sysctl_value:base ok",
		.insns = {
		@@ -848,6 +907,11 @@ static int access_sysctl(const char *sysctl_path,

		if (read(fd, buf, sizeof(buf)) == -1)
		goto err;
		if (test->oldval &&
		strncmp(buf, test->oldval, strlen(test->oldval))) {
		log_err("Read value %s != %s", buf, test->oldval);
		goto err;
		}
		} else if (test->open_flags == O_WRONLY) {
		if (!test->newval) {
		log_err("New value for sysctl is not set");

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