tools/testing/selftests/bpf/progs/verifier_unpriv_perf.c
Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/verifier_unpriv_perf.c
File Facts
- System
- Linux kernel
- Corpus path
tools/testing/selftests/bpf/progs/verifier_unpriv_perf.c- Extension
.c- Size
- 956 bytes
- Lines
- 35
- 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.
- Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
vmlinux.hbpf/bpf_helpers.hbpf_misc.h
Detected Declarations
function __msg
Annotated Snippet
// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/unpriv.c */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
SEC("perf_event")
__description("unpriv: spill/fill of different pointers ldx")
__failure __msg("same insn cannot be used with different pointers")
__naked void fill_of_different_pointers_ldx(void)
{
asm volatile (" \
r6 = r10; \
r6 += -8; \
if r1 == 0 goto l0_%=; \
r2 = r10; \
r2 += %[__imm_0]; \
*(u64*)(r6 + 0) = r2; \
l0_%=: if r1 != 0 goto l1_%=; \
*(u64*)(r6 + 0) = r1; \
l1_%=: r1 = *(u64*)(r6 + 0); \
r1 = *(u64*)(r1 + %[sample_period]); \
r0 = 0; \
exit; \
" :
: __imm_const(__imm_0,
-(__s32) offsetof(struct bpf_perf_event_data, sample_period) - 8),
__imm_const(sample_period,
offsetof(struct bpf_perf_event_data, sample_period))
: __clobber_all);
}
char _license[] SEC("license") = "GPL";
Annotation
- Immediate include surface: `vmlinux.h`, `bpf/bpf_helpers.h`, `bpf_misc.h`.
- Detected declarations: `function __msg`.
- Atlas domain: Support Tooling And Documentation / tools.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.