tools/testing/selftests/bpf/prog_tests/test_sysctl.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/prog_tests/test_sysctl.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/prog_tests/test_sysctl.c
Extension
.c
Size
40833 bytes
Lines
1616
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct sysctl_test {
	const char *descr;
	size_t fixup_value_insn;
	struct bpf_insn	insns[MAX_INSNS];
	const char *prog_file;
	enum bpf_attach_type attach_type;
	const char *sysctl;
	int open_flags;
	int seek;
	const char *newval;
	const char *oldval;
	enum {
		LOAD_REJECT,
		ATTACH_REJECT,
		OP_EPERM,
		SUCCESS,
	} result;
	struct bpf_object *obj;
};

static struct sysctl_test tests[] = {
	{
		.descr = "sysctl wrong attach_type",
		.insns = {
			BPF_MOV64_IMM(BPF_REG_0, 1),
			BPF_EXIT_INSN(),
		},
		.attach_type = 0,
		.sysctl = "kernel/ostype",
		.open_flags = O_RDONLY,
		.result = ATTACH_REJECT,
	},
	{
		.descr = "sysctl:read allow all",
		.insns = {
			BPF_MOV64_IMM(BPF_REG_0, 1),
			BPF_EXIT_INSN(),
		},
		.attach_type = BPF_CGROUP_SYSCTL,
		.sysctl = "kernel/ostype",
		.open_flags = O_RDONLY,
		.result = SUCCESS,
	},
	{
		.descr = "sysctl:read deny all",
		.insns = {
			BPF_MOV64_IMM(BPF_REG_0, 0),
			BPF_EXIT_INSN(),
		},
		.attach_type = BPF_CGROUP_SYSCTL,
		.sysctl = "kernel/ostype",
		.open_flags = O_RDONLY,
		.result = OP_EPERM,
	},
	{
		.descr = "ctx:write sysctl:read read ok",
		.insns = {
			/* If (write) */
			BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,
				    offsetof(struct bpf_sysctl, write)),
			BPF_JMP_IMM(BPF_JNE, BPF_REG_7, 1, 2),

			/* return DENY; */
			BPF_MOV64_IMM(BPF_REG_0, 0),
			BPF_JMP_A(1),

			/* else return ALLOW; */
			BPF_MOV64_IMM(BPF_REG_0, 1),
			BPF_EXIT_INSN(),
		},
		.attach_type = BPF_CGROUP_SYSCTL,
		.sysctl = "kernel/ostype",
		.open_flags = O_RDONLY,
		.result = SUCCESS,
	},
	{
		.descr = "ctx:write sysctl:write read ok",
		.insns = {
			/* If (write) */
			BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,
				    offsetof(struct bpf_sysctl, write)),
			BPF_JMP_IMM(BPF_JNE, BPF_REG_7, 1, 2),

			/* return DENY; */
			BPF_MOV64_IMM(BPF_REG_0, 0),
			BPF_JMP_A(1),

			/* else return ALLOW; */
			BPF_MOV64_IMM(BPF_REG_0, 1),
			BPF_EXIT_INSN(),

Annotation

Implementation Notes