tools/testing/selftests/bpf/verifier/ctx_skb.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/verifier/ctx_skb.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/verifier/ctx_skb.c
Extension
.c
Size
34356 bytes
Lines
1196
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

{
	"access skb fields ok",
	.insns = {
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
		    offsetof(struct __sk_buff, len)),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 0, 1),
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
		    offsetof(struct __sk_buff, mark)),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 0, 1),
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
		    offsetof(struct __sk_buff, pkt_type)),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 0, 1),
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
		    offsetof(struct __sk_buff, queue_mapping)),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 0, 0),
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
		    offsetof(struct __sk_buff, protocol)),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 0, 0),
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
		    offsetof(struct __sk_buff, vlan_present)),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 0, 0),
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
		    offsetof(struct __sk_buff, vlan_tci)),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 0, 0),
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
		    offsetof(struct __sk_buff, napi_id)),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 0, 0),
	BPF_EXIT_INSN(),
	},
	.result = ACCEPT,
},
{
	"access skb fields bad1",
	.insns = {
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, -4),
	BPF_EXIT_INSN(),
	},
	.errstr = "invalid bpf_context access",
	.result = REJECT,
},
{
	"access skb fields bad2",
	.insns = {
	BPF_JMP_IMM(BPF_JGE, BPF_REG_1, 0, 9),
	BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
	BPF_LD_MAP_FD(BPF_REG_1, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
		    offsetof(struct __sk_buff, pkt_type)),
	BPF_EXIT_INSN(),
	},
	.fixup_map_hash_8b = { 4 },
	.errstr = "different pointers",
	.errstr_unpriv = "R1 pointer comparison",
	.result = REJECT,
},
{
	"access skb fields bad3",
	.insns = {
	BPF_JMP_IMM(BPF_JGE, BPF_REG_1, 0, 2),
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
		    offsetof(struct __sk_buff, pkt_type)),
	BPF_EXIT_INSN(),
	BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
	BPF_LD_MAP_FD(BPF_REG_1, 0),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
	BPF_JMP_IMM(BPF_JA, 0, 0, -12),
	},
	.fixup_map_hash_8b = { 6 },
	.errstr = "different pointers",
	.errstr_unpriv = "R1 pointer comparison",
	.result = REJECT,
},
{
	"access skb fields bad4",
	.insns = {
	BPF_JMP_IMM(BPF_JGE, BPF_REG_1, 0, 3),
	BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_1,
		    offsetof(struct __sk_buff, len)),
	BPF_MOV64_IMM(BPF_REG_0, 0),

Annotation

Implementation Notes