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

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

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/verifier/dead_code.c
Extension
.c
Size
4035 bytes
Lines
173
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

{
	"dead code: start",
	.insns = {
	BPF_JMP_IMM(BPF_JA, 0, 0, 2),
	/* unpriv: nospec (inserted to prevent "R9 !read_ok") */
	BPF_LDX_MEM(BPF_B, BPF_REG_8, BPF_REG_9, 0),
	BPF_JMP_IMM(BPF_JA, 0, 0, 2),
	BPF_MOV64_IMM(BPF_REG_0, 7),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 10, -4),
	BPF_EXIT_INSN(),
	},
	.result = ACCEPT,
	.retval = 7,
},
{
	"dead code: mid 1",
	.insns = {
	BPF_MOV64_IMM(BPF_REG_0, 7),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 0, 1),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 10, 0),
	BPF_EXIT_INSN(),
	},
	.result = ACCEPT,
	.retval = 7,
},
{
	"dead code: mid 2",
	.insns = {
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
	BPF_JMP_IMM(BPF_JSET, BPF_REG_0, 1, 4),
	BPF_JMP_IMM(BPF_JSET, BPF_REG_0, 1, 1),
	BPF_JMP_IMM(BPF_JA, 0, 0, 2),
	BPF_MOV64_IMM(BPF_REG_0, 7),
	BPF_EXIT_INSN(),
	BPF_MOV64_IMM(BPF_REG_0, 1),
	BPF_EXIT_INSN(),
	},
	.result = ACCEPT,
	.retval = 1,
},
{
	"dead code: end 1",
	.insns = {
	BPF_MOV64_IMM(BPF_REG_0, 7),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 10, 1),
	BPF_EXIT_INSN(),
	BPF_EXIT_INSN(),
	},
	.result = ACCEPT,
	.retval = 7,
},
{
	"dead code: end 2",
	.insns = {
	BPF_MOV64_IMM(BPF_REG_0, 7),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 10, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_IMM(BPF_REG_0, 12),
	BPF_EXIT_INSN(),
	},
	.result = ACCEPT,
	.retval = 7,
},
{
	"dead code: end 3",
	.insns = {
	BPF_MOV64_IMM(BPF_REG_0, 7),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 8, 1),
	BPF_EXIT_INSN(),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 10, 1),
	BPF_JMP_IMM(BPF_JA, 0, 0, 1),
	BPF_MOV64_IMM(BPF_REG_0, 12),
	BPF_JMP_IMM(BPF_JA, 0, 0, -5),
	},
	.result = ACCEPT,
	.retval = 7,
},
{
	"dead code: tail of main + func",
	.insns = {
	BPF_MOV64_IMM(BPF_REG_0, 7),
	BPF_JMP_IMM(BPF_JGE, BPF_REG_0, 8, 1),
	BPF_EXIT_INSN(),
	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
	BPF_EXIT_INSN(),
	BPF_MOV64_IMM(BPF_REG_0, 12),
	BPF_EXIT_INSN(),
	},
	.errstr_unpriv = "loading/calling other bpf or kernel functions are allowed for",
	.result_unpriv = REJECT,

Annotation

Implementation Notes