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

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

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/verifier/map_kptr.c
Extension
.c
Size
14271 bytes
Lines
445
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

{
	"map_kptr: BPF_ST imm != 0",
	.insns = {
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_LD_MAP_FD(BPF_REG_6, 0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 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_ST_MEM(BPF_DW, BPF_REG_0, 0, 1),
	BPF_EXIT_INSN(),
	},
	.prog_type = BPF_PROG_TYPE_SCHED_CLS,
	.fixup_map_kptr = { 1 },
	.result = REJECT,
	.errstr = "BPF_ST imm must be 0 when storing to kptr at off=0",
},
{
	"map_kptr: size != bpf_size_to_bytes(BPF_DW)",
	.insns = {
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_LD_MAP_FD(BPF_REG_6, 0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 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_ST_MEM(BPF_W, BPF_REG_0, 0, 0),
	BPF_EXIT_INSN(),
	},
	.prog_type = BPF_PROG_TYPE_SCHED_CLS,
	.fixup_map_kptr = { 1 },
	.result = REJECT,
	.errstr = "kptr access size must be BPF_DW",
},
{
	"map_kptr: map_value non-const var_off",
	.insns = {
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_LD_MAP_FD(BPF_REG_6, 0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 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_3, BPF_REG_0),
	BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_0, 0),
	BPF_JMP_IMM(BPF_JNE, BPF_REG_2, 0, 1),
	BPF_EXIT_INSN(),
	BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_2, 0),
	BPF_JMP_IMM(BPF_JLE, BPF_REG_2, 4, 1),
	BPF_EXIT_INSN(),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_2, 0, 1),
	BPF_EXIT_INSN(),
	BPF_ALU64_REG(BPF_ADD, BPF_REG_3, BPF_REG_2),
	BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0),
	BPF_EXIT_INSN(),
	},
	.prog_type = BPF_PROG_TYPE_SCHED_CLS,
	.fixup_map_kptr = { 1 },
	.result = REJECT,
	.errstr = "kptr access cannot have variable offset",
	.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
	"map_kptr: bpf_kptr_xchg non-const var_off",
	.insns = {
	BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
	BPF_LD_MAP_FD(BPF_REG_6, 0),
	BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
	BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 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_3, BPF_REG_0),
	BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_0, 0),
	BPF_JMP_IMM(BPF_JNE, BPF_REG_2, 0, 1),
	BPF_EXIT_INSN(),
	BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_2, 0),
	BPF_JMP_IMM(BPF_JLE, BPF_REG_2, 4, 1),
	BPF_EXIT_INSN(),

Annotation

Implementation Notes