tools/testing/selftests/powerpc/signal/sigfuz.c

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/powerpc/signal/sigfuz.c

Extension

.c

Size

8907 bytes

Lines

326

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

• stdio.h
• limits.h
• sys/wait.h
• unistd.h
• stdlib.h
• signal.h
• string.h
• ucontext.h
• sys/mman.h
• pthread.h
• utils.h

Detected Declarations

• function one_in_chance
• function mess_with_tm
• function trap_signal_handler
• function seg_signal_handler
• function signal_fuzzer
• function show_help
• function main

Annotated Snippet

if (tmp_uc) {
			free(tmp_uc);
			tmp_uc = NULL;
		}
		tmp_uc = malloc(sizeof(ucontext_t));
		ucp->uc_link = tmp_uc;
		/* Trying to cause a major page fault at Kernel level */
		madvise(ucp->uc_link, sizeof(ucontext_t), MADV_DONTNEED);
	}

	if (args & ARG_MESS_WITH_MSR_AT) {
		/* Changing the checkpointed registers */
		if (one_in_chance(4)) {
			ucp->uc_link->uc_mcontext.gp_regs[PT_MSR] |= MSR_TS_S;
		} else {
			if (one_in_chance(2)) {
				ucp->uc_link->uc_mcontext.gp_regs[PT_MSR] |=
						 MSR_TS_T;
			} else if (one_in_chance(2)) {
				ucp->uc_link->uc_mcontext.gp_regs[PT_MSR] |=
						MSR_TS_T | MSR_TS_S;
			}
		}

		/* Checking the current register context */
		if (one_in_chance(2)) {
			ucp->uc_mcontext.gp_regs[PT_MSR] |= MSR_TS_S;
		} else if (one_in_chance(2)) {
			if (one_in_chance(2))
				ucp->uc_mcontext.gp_regs[PT_MSR] |=
					MSR_TS_T;
			else if (one_in_chance(2))
				ucp->uc_mcontext.gp_regs[PT_MSR] |=
					MSR_TS_T | MSR_TS_S;
		}
	}

	if (one_in_chance(20)) {
		/* Nested transaction start */
		if (one_in_chance(5))
			mess_with_tm();

		/* Return without changing any other context info */
		return;
	}

	if (one_in_chance(10))
		ucp->uc_mcontext.gp_regs[PT_MSR] = random();
	if (one_in_chance(10))
		ucp->uc_mcontext.gp_regs[PT_NIP] = random();
	if (one_in_chance(10))
		ucp->uc_link->uc_mcontext.gp_regs[PT_MSR] = random();
	if (one_in_chance(10))
		ucp->uc_link->uc_mcontext.gp_regs[PT_NIP] = random();

	ucp->uc_mcontext.gp_regs[PT_TRAP] = random();
	ucp->uc_mcontext.gp_regs[PT_DSISR] = random();
	ucp->uc_mcontext.gp_regs[PT_DAR] = random();
	ucp->uc_mcontext.gp_regs[PT_ORIG_R3] = random();
	ucp->uc_mcontext.gp_regs[PT_XER] = random();
	ucp->uc_mcontext.gp_regs[PT_RESULT] = random();
	ucp->uc_mcontext.gp_regs[PT_SOFTE] = random();
	ucp->uc_mcontext.gp_regs[PT_DSCR] = random();
	ucp->uc_mcontext.gp_regs[PT_CTR] = random();
	ucp->uc_mcontext.gp_regs[PT_LNK] = random();
	ucp->uc_mcontext.gp_regs[PT_CCR] = random();
	ucp->uc_mcontext.gp_regs[PT_REGS_COUNT] = random();

	ucp->uc_link->uc_mcontext.gp_regs[PT_TRAP] = random();
	ucp->uc_link->uc_mcontext.gp_regs[PT_DSISR] = random();
	ucp->uc_link->uc_mcontext.gp_regs[PT_DAR] = random();
	ucp->uc_link->uc_mcontext.gp_regs[PT_ORIG_R3] = random();
	ucp->uc_link->uc_mcontext.gp_regs[PT_XER] = random();
	ucp->uc_link->uc_mcontext.gp_regs[PT_RESULT] = random();
	ucp->uc_link->uc_mcontext.gp_regs[PT_SOFTE] = random();
	ucp->uc_link->uc_mcontext.gp_regs[PT_DSCR] = random();
	ucp->uc_link->uc_mcontext.gp_regs[PT_CTR] = random();
	ucp->uc_link->uc_mcontext.gp_regs[PT_LNK] = random();
	ucp->uc_link->uc_mcontext.gp_regs[PT_CCR] = random();
	ucp->uc_link->uc_mcontext.gp_regs[PT_REGS_COUNT] = random();

	if (args & ARG_MESS_WITH_TM_BEFORE) {
		if (one_in_chance(2))
			mess_with_tm();
	}
}

static void seg_signal_handler(int signo, siginfo_t *si, void *uc)
{
	/* Clear exit for process that segfaults */

Annotation

• Immediate include surface: `stdio.h`, `limits.h`, `sys/wait.h`, `unistd.h`, `stdlib.h`, `signal.h`, `string.h`, `ucontext.h`.
• Detected declarations: `function one_in_chance`, `function mess_with_tm`, `function trap_signal_handler`, `function seg_signal_handler`, `function signal_fuzzer`, `function show_help`, `function main`.
• 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.