tools/testing/selftests/riscv/abi/pointer_masking.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/riscv/abi/pointer_masking.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/riscv/abi/pointer_masking.c
Extension
.c
Size
8337 bytes
Lines
349
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

execve("/proc/self/exe", (char *const []) { "", NULL }, NULL);
	}
}

static bool pwrite_wrapper(int fd, void *buf, size_t count, const char *msg)
{
	int ret = pwrite(fd, buf, count, 0);

	if (ret != count) {
		ksft_perror(msg);
		return false;
	}
	return true;
}

static void test_tagged_addr_abi_sysctl(void)
{
	char *err_pwrite_msg = "failed to write to /proc/sys/abi/tagged_addr_disabled\n";
	char value;
	int fd;

	ksft_print_msg("Testing tagged address ABI sysctl\n");

	fd = open("/proc/sys/abi/tagged_addr_disabled", O_WRONLY);
	if (fd < 0) {
		ksft_test_result_skip("failed to open sysctl file\n");
		ksft_test_result_skip("failed to open sysctl file\n");
		return;
	}

	value = '1';
	if (!pwrite_wrapper(fd, &value, 1, "write '1'"))
		ksft_test_result_fail(err_pwrite_msg);
	else
		ksft_test_result(set_tagged_addr_ctrl(min_pmlen, true) == -EINVAL,
				 "sysctl disabled\n");

	value = '0';
	if (!pwrite_wrapper(fd, &value, 1, "write '0'"))
		ksft_test_result_fail(err_pwrite_msg);
	else
		ksft_test_result(set_tagged_addr_ctrl(min_pmlen, true) == 0,
				 "sysctl enabled\n");

	set_tagged_addr_ctrl(0, false);

	close(fd);
}

static void test_tagged_addr_abi_pmlen(int pmlen)
{
	int i, *p, ret;

	i = ~pmlen;

	if (pmlen) {
		p = (int *)((uintptr_t)&i | 1UL << (__riscv_xlen - pmlen));

		ret = set_tagged_addr_ctrl(pmlen, false);
		if (ret)
			return ksft_test_result_error("PMLEN=%d ABI disabled setup (%d)\n",
						      pmlen, ret);

		ret = write(pipefd[1], p, sizeof(*p));
		if (ret >= 0 || errno != EFAULT)
			return ksft_test_result_fail("PMLEN=%d ABI disabled write\n", pmlen);

		ret = read(dev_zero, p, sizeof(*p));
		if (ret >= 0 || errno != EFAULT)
			return ksft_test_result_fail("PMLEN=%d ABI disabled read\n", pmlen);

		if (i != ~pmlen)
			return ksft_test_result_fail("PMLEN=%d ABI disabled value\n", pmlen);

		ret = set_tagged_addr_ctrl(pmlen, true);
		if (ret)
			return ksft_test_result_error("PMLEN=%d ABI enabled setup (%d)\n",
						      pmlen, ret);

		ret = write(pipefd[1], p, sizeof(*p));
		if (ret != sizeof(*p))
			return ksft_test_result_fail("PMLEN=%d ABI enabled write\n", pmlen);

		ret = read(dev_zero, p, sizeof(*p));
		if (ret != sizeof(*p))
			return ksft_test_result_fail("PMLEN=%d ABI enabled read\n", pmlen);

		if (i)
			return ksft_test_result_fail("PMLEN=%d ABI enabled value\n", pmlen);

Annotation

Implementation Notes