tools/testing/selftests/bpf/progs/uprobe_multi_session.c

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/bpf/progs/uprobe_multi_session.c

Extension

.c

Size

1573 bytes

Lines

71

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.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• vmlinux.h
• bpf/bpf_helpers.h
• bpf/bpf_tracing.h
• stdbool.h
• bpf_misc.h

Detected Declarations

• function uprobe_multi_check
• function uprobe
• function verify_sleepable_user_copy
• function uprobe_sleepable

Annotated Snippet

if (funcs[i] == addr) {
			uprobe_session_result[i]++;
			break;
		}
	}

	/* only uprobe_multi_func_2 executes return probe */
	if ((addr == uprobe_multi_func_1_addr) ||
	    (addr == uprobe_multi_func_3_addr))
		return 1;

	return 0;
}

SEC("uprobe.session//proc/self/exe:uprobe_multi_func_*")
int uprobe(struct pt_regs *ctx)
{
	return uprobe_multi_check(ctx, bpf_session_is_return(ctx));
}

static __always_inline bool verify_sleepable_user_copy(void)
{
	char data[9];

	bpf_copy_from_user(data, sizeof(data), user_ptr);
	return bpf_strncmp(data, sizeof(data), "test_data") == 0;
}

SEC("uprobe.session.s//proc/self/exe:uprobe_multi_func_*")
int uprobe_sleepable(struct pt_regs *ctx)
{
	if (verify_sleepable_user_copy())
		uprobe_multi_sleep_result++;
	return uprobe_multi_check(ctx, bpf_session_is_return(ctx));
}

Annotation

• Immediate include surface: `vmlinux.h`, `bpf/bpf_helpers.h`, `bpf/bpf_tracing.h`, `stdbool.h`, `bpf_misc.h`.
• Detected declarations: `function uprobe_multi_check`, `function uprobe`, `function verify_sleepable_user_copy`, `function uprobe_sleepable`.
• Atlas domain: Support Tooling And Documentation / tools.
• Implementation status: source implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.

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.