Message-Id: <20240314103216.286603-1-usama.anjum@collabora.com>
Date: Thu, 14 Mar 2024 15:32:13 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: Shuah Khan <shuah@...nel.org>,
	Muhammad Usama Anjum <usama.anjum@...labora.com>
Cc: kernel@...labora.com,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] selftests: x86: test_vsyscall: conform test to TAP format output

Conform the layout, informational and status messages to TAP. No
functional change is intended other than the layout of output messages.
Without using TAP messages, the passed/failed/skip test names cannot be
found.

Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
---
 tools/testing/selftests/x86/test_vsyscall.c | 506 +++++++++-----------
 1 file changed, 238 insertions(+), 268 deletions(-)

diff --git a/tools/testing/selftests/x86/test_vsyscall.c b/tools/testing/selftests/x86/test_vsyscall.c
index 47cab972807c4..d4c8e8d79d389 100644
--- a/tools/testing/selftests/x86/test_vsyscall.c
+++ b/tools/testing/selftests/x86/test_vsyscall.c
@@ -21,6 +21,13 @@
 #include <sys/uio.h>
 
 #include "helpers.h"
+#include "../kselftest.h"
+
+#ifdef __x86_64__
+#define TOTAL_TESTS 13
+#else
+#define TOTAL_TESTS 8
+#endif
 
 #ifdef __x86_64__
 # define VSYS(x) (x)
@@ -39,18 +46,6 @@
 /* max length of lines in /proc/self/maps - anything longer is skipped here */
 #define MAPS_LINE_LEN 128
 
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
-		       int flags)
-{
-	struct sigaction sa;
-	memset(&sa, 0, sizeof(sa));
-	sa.sa_sigaction = handler;
-	sa.sa_flags = SA_SIGINFO | flags;
-	sigemptyset(&sa.sa_mask);
-	if (sigaction(sig, &sa, 0))
-		err(1, "sigaction");
-}
-
 /* vsyscalls and vDSO */
 bool vsyscall_map_r = false, vsyscall_map_x = false;
 
@@ -75,83 +70,25 @@ static void init_vdso(void)
 	if (!vdso)
 		vdso = dlopen("linux-gate.so.1", RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
 	if (!vdso) {
-		printf("[WARN]\tfailed to find vDSO\n");
+		ksft_print_msg("[WARN] failed to find vDSO\n");
 		return;
 	}
 
 	vdso_gtod = (gtod_t)dlsym(vdso, "__vdso_gettimeofday");
 	if (!vdso_gtod)
-		printf("[WARN]\tfailed to find gettimeofday in vDSO\n");
+		ksft_print_msg("[WARN] failed to find gettimeofday in vDSO\n");
 
 	vdso_gettime = (vgettime_t)dlsym(vdso, "__vdso_clock_gettime");
 	if (!vdso_gettime)
-		printf("[WARN]\tfailed to find clock_gettime in vDSO\n");
+		ksft_print_msg("[WARN] failed to find clock_gettime in vDSO\n");
 
 	vdso_time = (time_func_t)dlsym(vdso, "__vdso_time");
 	if (!vdso_time)
-		printf("[WARN]\tfailed to find time in vDSO\n");
+		ksft_print_msg("[WARN] failed to find time in vDSO\n");
 
 	vdso_getcpu = (getcpu_t)dlsym(vdso, "__vdso_getcpu");
 	if (!vdso_getcpu)
-		printf("[WARN]\tfailed to find getcpu in vDSO\n");
-}
-
-static int init_vsys(void)
-{
-#ifdef __x86_64__
-	int nerrs = 0;
-	FILE *maps;
-	char line[MAPS_LINE_LEN];
-	bool found = false;
-
-	maps = fopen("/proc/self/maps", "r");
-	if (!maps) {
-		printf("[WARN]\tCould not open /proc/self/maps -- assuming vsyscall is r-x\n");
-		vsyscall_map_r = true;
-		return 0;
-	}
-
-	while (fgets(line, MAPS_LINE_LEN, maps)) {
-		char r, x;
-		void *start, *end;
-		char name[MAPS_LINE_LEN];
-
-		/* sscanf() is safe here as strlen(name) >= strlen(line) */
-		if (sscanf(line, "%p-%p %c-%cp %*x %*x:%*x %*u %s",
-			   &start, &end, &r, &x, name) != 5)
-			continue;
-
-		if (strcmp(name, "[vsyscall]"))
-			continue;
-
-		printf("\tvsyscall map: %s", line);
-
-		if (start != (void *)0xffffffffff600000 ||
-		    end != (void *)0xffffffffff601000) {
-			printf("[FAIL]\taddress range is nonsense\n");
-			nerrs++;
-		}
-
-		printf("\tvsyscall permissions are %c-%c\n", r, x);
-		vsyscall_map_r = (r == 'r');
-		vsyscall_map_x = (x == 'x');
-
-		found = true;
-		break;
-	}
-
-	fclose(maps);
-
-	if (!found) {
-		printf("\tno vsyscall map in /proc/self/maps\n");
-		vsyscall_map_r = false;
-		vsyscall_map_x = false;
-	}
-
-	return nerrs;
-#else
-	return 0;
-#endif
+		ksft_print_msg("[WARN] failed to find getcpu in vDSO\n");
 }
 
 /* syscalls */
@@ -176,98 +113,76 @@ static inline long sys_getcpu(unsigned * cpu, unsigned * node,
 	return syscall(SYS_getcpu, cpu, node, cache);
 }
 
-static jmp_buf jmpbuf;
-static volatile unsigned long segv_err;
-
-static void sigsegv(int sig, siginfo_t *info, void *ctx_void)
-{
-	ucontext_t *ctx = (ucontext_t *)ctx_void;
-
-	segv_err =  ctx->uc_mcontext.gregs[REG_ERR];
-	siglongjmp(jmpbuf, 1);
-}
-
 static double tv_diff(const struct timeval *a, const struct timeval *b)
 {
 	return (double)(a->tv_sec - b->tv_sec) +
 		(double)((int)a->tv_usec - (int)b->tv_usec) * 1e-6;
 }
 
-static int check_gtod(const struct timeval *tv_sys1,
-		      const struct timeval *tv_sys2,
-		      const struct timezone *tz_sys,
-		      const char *which,
-		      const struct timeval *tv_other,
-		      const struct timezone *tz_other)
+static void check_gtod(const struct timeval *tv_sys1,
+		       const struct timeval *tv_sys2,
+		       const struct timezone *tz_sys,
+		       const char *which,
+		       const struct timeval *tv_other,
+		       const struct timezone *tz_other)
 {
-	int nerrs = 0;
 	double d1, d2;
 
-	if (tz_other && (tz_sys->tz_minuteswest != tz_other->tz_minuteswest || tz_sys->tz_dsttime != tz_other->tz_dsttime)) {
-		printf("[FAIL] %s tz mismatch\n", which);
-		nerrs++;
-	}
+	if (tz_other && (tz_sys->tz_minuteswest != tz_other->tz_minuteswest ||
+			 tz_sys->tz_dsttime != tz_other->tz_dsttime))
+		ksft_print_msg("%s tz mismatch\n", which);
 
 	d1 = tv_diff(tv_other, tv_sys1);
 	d2 = tv_diff(tv_sys2, tv_other); 
-	printf("\t%s time offsets: %lf %lf\n", which, d1, d2);
 
-	if (d1 < 0 || d2 < 0) {
-		printf("[FAIL]\t%s time was inconsistent with the syscall\n", which);
-		nerrs++;
-	} else {
-		printf("[OK]\t%s gettimeofday()'s timeval was okay\n", which);
-	}
+	ksft_print_msg("%s time offsets: %lf %lf\n", which, d1, d2);
 
-	return nerrs;
+	ksft_test_result(!(d1 < 0 || d2 < 0), "%s gettimeofday()'s timeval\n", which);
 }
 
-static int test_gtod(void)
+static void test_gtod(void)
 {
 	struct timeval tv_sys1, tv_sys2, tv_vdso, tv_vsys;
 	struct timezone tz_sys, tz_vdso, tz_vsys;
 	long ret_vdso = -1;
 	long ret_vsys = -1;
-	int nerrs = 0;
 
-	printf("[RUN]\ttest gettimeofday()\n");
+	ksft_print_msg("test gettimeofday()\n");
 
 	if (sys_gtod(&tv_sys1, &tz_sys) != 0)
-		err(1, "syscall gettimeofday");
+		ksft_exit_fail_msg("syscall gettimeofday: %s\n", strerror(errno));
 	if (vdso_gtod)
 		ret_vdso = vdso_gtod(&tv_vdso, &tz_vdso);
 	if (vsyscall_map_x)
 		ret_vsys = vgtod(&tv_vsys, &tz_vsys);
 	if (sys_gtod(&tv_sys2, &tz_sys) != 0)
-		err(1, "syscall gettimeofday");
+		ksft_exit_fail_msg("syscall gettimeofday: %s\n", strerror(errno));
 
 	if (vdso_gtod) {
-		if (ret_vdso == 0) {
-			nerrs += check_gtod(&tv_sys1, &tv_sys2, &tz_sys, "vDSO", &tv_vdso, &tz_vdso);
-		} else {
-			printf("[FAIL]\tvDSO gettimeofday() failed: %ld\n", ret_vdso);
-			nerrs++;
-		}
+		if (ret_vdso == 0)
+			check_gtod(&tv_sys1, &tv_sys2, &tz_sys, "vDSO", &tv_vdso, &tz_vdso);
+		else
+			ksft_test_result_fail("vDSO gettimeofday() failed: %ld\n", ret_vdso);
+	} else {
+		ksft_test_result_skip("vdso_gtod isn't set\n");
 	}
 
 	if (vsyscall_map_x) {
-		if (ret_vsys == 0) {
-			nerrs += check_gtod(&tv_sys1, &tv_sys2, &tz_sys, "vsyscall", &tv_vsys, &tz_vsys);
-		} else {
-			printf("[FAIL]\tvsys gettimeofday() failed: %ld\n", ret_vsys);
-			nerrs++;
-		}
+		if (ret_vsys == 0)
+			check_gtod(&tv_sys1, &tv_sys2, &tz_sys, "vsyscall", &tv_vsys, &tz_vsys);
+		else
+			ksft_test_result_fail("vsys gettimeofday() failed: %ld\n", ret_vsys);
+	} else {
+		ksft_test_result_skip("vsyscall_map_x isn't set\n");
 	}
-
-	return nerrs;
 }
 
-static int test_time(void) {
-	int nerrs = 0;
-
-	printf("[RUN]\ttest time()\n");
+static void test_time(void)
+{
 	long t_sys1, t_sys2, t_vdso = 0, t_vsys = 0;
 	long t2_sys1 = -1, t2_sys2 = -1, t2_vdso = -1, t2_vsys = -1;
+
+	ksft_print_msg("test time()\n");
 	t_sys1 = sys_time(&t2_sys1);
 	if (vdso_time)
 		t_vdso = vdso_time(&t2_vdso);
@@ -275,56 +190,60 @@ static int test_time(void) {
 		t_vsys = vtime(&t2_vsys);
 	t_sys2 = sys_time(&t2_sys2);
 	if (t_sys1 < 0 || t_sys1 != t2_sys1 || t_sys2 < 0 || t_sys2 != t2_sys2) {
-		printf("[FAIL]\tsyscall failed (ret1:%ld output1:%ld ret2:%ld output2:%ld)\n", t_sys1, t2_sys1, t_sys2, t2_sys2);
-		nerrs++;
-		return nerrs;
+		ksft_print_msg("syscall failed (ret1:%ld output1:%ld ret2:%ld output2:%ld)\n",
+			       t_sys1, t2_sys1, t_sys2, t2_sys2);
+		ksft_test_result_skip("vdso_time\n");
+		ksft_test_result_skip("vdso_time\n");
+		return;
 	}
 
 	if (vdso_time) {
-		if (t_vdso < 0 || t_vdso != t2_vdso) {
-			printf("[FAIL]\tvDSO failed (ret:%ld output:%ld)\n", t_vdso, t2_vdso);
-			nerrs++;
-		} else if (t_vdso < t_sys1 || t_vdso > t_sys2) {
-			printf("[FAIL]\tvDSO returned the wrong time (%ld %ld %ld)\n", t_sys1, t_vdso, t_sys2);
-			nerrs++;
-		} else {
-			printf("[OK]\tvDSO time() is okay\n");
-		}
+		if (t_vdso < 0 || t_vdso != t2_vdso)
+			ksft_test_result_fail("vDSO failed (ret:%ld output:%ld)\n",
+					      t_vdso, t2_vdso);
+		else if (t_vdso < t_sys1 || t_vdso > t_sys2)
+			ksft_test_result_fail("vDSO returned the wrong time (%ld %ld %ld)\n",
+					      t_sys1, t_vdso, t_sys2);
+		else
+			ksft_test_result_pass("vDSO time() is okay\n");
+	} else {
+		ksft_test_result_skip("vdso_time isn't set\n");
 	}
 
 	if (vsyscall_map_x) {
-		if (t_vsys < 0 || t_vsys != t2_vsys) {
-			printf("[FAIL]\tvsyscall failed (ret:%ld output:%ld)\n", t_vsys, t2_vsys);
-			nerrs++;
-		} else if (t_vsys < t_sys1 || t_vsys > t_sys2) {
-			printf("[FAIL]\tvsyscall returned the wrong time (%ld %ld %ld)\n", t_sys1, t_vsys, t_sys2);
-			nerrs++;
-		} else {
-			printf("[OK]\tvsyscall time() is okay\n");
-		}
+		if (t_vsys < 0 || t_vsys != t2_vsys)
+			ksft_test_result_fail("vsyscall failed (ret:%ld output:%ld)\n",
+					      t_vsys, t2_vsys);
+		else if (t_vsys < t_sys1 || t_vsys > t_sys2)
+			ksft_test_result_fail("vsyscall returned the wrong time (%ld %ld %ld)\n",
+					      t_sys1, t_vsys, t_sys2);
+		else
+			ksft_test_result_pass("vsyscall time() is okay\n");
+	} else {
+		ksft_test_result_skip("vsyscall_map_x isn't set\n");
 	}
-
-	return nerrs;
 }
 
-static int test_getcpu(int cpu)
+static void test_getcpu(int cpu)
 {
-	int nerrs = 0;
+	unsigned int cpu_sys, cpu_vdso, cpu_vsys, node_sys, node_vdso, node_vsys;
 	long ret_sys, ret_vdso = -1, ret_vsys = -1;
+	unsigned int node = 0;
+	bool have_node = false;
+	cpu_set_t cpuset;
 
-	printf("[RUN]\tgetcpu() on CPU %d\n", cpu);
+	ksft_print_msg("getcpu() on CPU %d\n", cpu);
 
-	cpu_set_t cpuset;
 	CPU_ZERO(&cpuset);
 	CPU_SET(cpu, &cpuset);
 	if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0) {
-		printf("[SKIP]\tfailed to force CPU %d\n", cpu);
-		return nerrs;
+		ksft_print_msg("failed to force CPU %d\n", cpu);
+		ksft_test_result_skip("vdso_getcpu\n");
+		ksft_test_result_skip("vsyscall_map_x\n");
+
+		return;
 	}
 
-	unsigned cpu_sys, cpu_vdso, cpu_vsys, node_sys, node_vdso, node_vsys;
-	unsigned node = 0;
-	bool have_node = false;
 	ret_sys = sys_getcpu(&cpu_sys, &node_sys, 0);
 	if (vdso_getcpu)
 		ret_vdso = vdso_getcpu(&cpu_vdso, &node_vdso, 0);
@@ -332,10 +251,9 @@ static int test_getcpu(int cpu)
 		ret_vsys = vgetcpu(&cpu_vsys, &node_vsys, 0);
 
 	if (ret_sys == 0) {
-		if (cpu_sys != cpu) {
-			printf("[FAIL]\tsyscall reported CPU %hu but should be %d\n", cpu_sys, cpu);
-			nerrs++;
-		}
+		if (cpu_sys != cpu)
+			ksft_print_msg("syscall reported CPU %hu but should be %d\n",
+				       cpu_sys, cpu);
 
 		have_node = true;
 		node = node_sys;
@@ -343,63 +261,84 @@ static int test_getcpu(int cpu)
 
 	if (vdso_getcpu) {
 		if (ret_vdso) {
-			printf("[FAIL]\tvDSO getcpu() failed\n");
-			nerrs++;
+			ksft_test_result_fail("vDSO getcpu() failed\n");
 		} else {
 			if (!have_node) {
 				have_node = true;
 				node = node_vdso;
 			}
 
-			if (cpu_vdso != cpu) {
-				printf("[FAIL]\tvDSO reported CPU %hu but should be %d\n", cpu_vdso, cpu);
-				nerrs++;
-			} else {
-				printf("[OK]\tvDSO reported correct CPU\n");
-			}
-
-			if (node_vdso != node) {
-				printf("[FAIL]\tvDSO reported node %hu but should be %hu\n", node_vdso, node);
-				nerrs++;
+			if (cpu_vdso != cpu || node_vdso != node) {
+				if (cpu_vdso != cpu)
+					ksft_print_msg("vDSO reported CPU %hu but should be %d\n",
+						       cpu_vdso, cpu);
+				if (node_vdso != node)
+					ksft_print_msg("vDSO reported node %hu but should be %hu\n",
+						       node_vdso, node);
+				ksft_test_result_fail("Wrong values\n");
 			} else {
-				printf("[OK]\tvDSO reported correct node\n");
+				ksft_test_result_pass("vDSO reported correct CPU and node\n");
 			}
 		}
+	} else {
+		ksft_test_result_skip("vdso_getcpu isn't set\n");
 	}
 
 	if (vsyscall_map_x) {
 		if (ret_vsys) {
-			printf("[FAIL]\tvsyscall getcpu() failed\n");
-			nerrs++;
+			ksft_test_result_fail("vsyscall getcpu() failed\n");
 		} else {
 			if (!have_node) {
 				have_node = true;
 				node = node_vsys;
 			}
 
-			if (cpu_vsys != cpu) {
-				printf("[FAIL]\tvsyscall reported CPU %hu but should be %d\n", cpu_vsys, cpu);
-				nerrs++;
+			if (cpu_vsys != cpu || node_vsys != node) {
+				if (cpu_vsys != cpu)
+					ksft_print_msg("vsyscall reported CPU %hu but should be %d\n",
+						       cpu_vsys, cpu);
+				if (node_vsys != node)
+					ksft_print_msg("vsyscall reported node %hu but should be %hu\n",
+						       node_vsys, node);
+				ksft_test_result_fail("Wrong values\n");
 			} else {
-				printf("[OK]\tvsyscall reported correct CPU\n");
-			}
-
-			if (node_vsys != node) {
-				printf("[FAIL]\tvsyscall reported node %hu but should be %hu\n", node_vsys, node);
-				nerrs++;
-			} else {
-				printf("[OK]\tvsyscall reported correct node\n");
+				ksft_test_result_pass("vsyscall reported correct CPU and node\n");
 			}
 		}
+	} else {
+		ksft_test_result_skip("vsyscall_map_x isn't set\n");
 	}
+}
+
+#ifdef __x86_64__
+
+static jmp_buf jmpbuf;
+static volatile unsigned long segv_err;
+
+static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
+		       int flags)
+{
+	struct sigaction sa;
 
-	return nerrs;
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_sigaction = handler;
+	sa.sa_flags = SA_SIGINFO | flags;
+	sigemptyset(&sa.sa_mask);
+	if (sigaction(sig, &sa, 0))
+		ksft_exit_fail_msg("sigaction failed\n");
 }
 
-static int test_vsys_r(void)
+static void sigsegv(int sig, siginfo_t *info, void *ctx_void)
 {
-#ifdef __x86_64__
-	printf("[RUN]\tChecking read access to the vsyscall page\n");
+	ucontext_t *ctx = (ucontext_t *)ctx_void;
+
+	segv_err =  ctx->uc_mcontext.gregs[REG_ERR];
+	siglongjmp(jmpbuf, 1);
+}
+
+static void test_vsys_r(void)
+{
+	ksft_print_msg("Checking read access to the vsyscall page\n");
 	bool can_read;
 	if (sigsetjmp(jmpbuf, 1) == 0) {
 		*(volatile int *)0xffffffffff600000;
@@ -408,32 +347,25 @@ static int test_vsys_r(void)
 		can_read = false;
 	}
 
-	if (can_read && !vsyscall_map_r) {
-		printf("[FAIL]\tWe have read access, but we shouldn't\n");
-		return 1;
-	} else if (!can_read && vsyscall_map_r) {
-		printf("[FAIL]\tWe don't have read access, but we should\n");
-		return 1;
-	} else if (can_read) {
-		printf("[OK]\tWe have read access\n");
-	} else {
-		printf("[OK]\tWe do not have read access: #PF(0x%lx)\n",
-		       segv_err);
-	}
-#endif
-
-	return 0;
+	if (can_read && !vsyscall_map_r)
+		ksft_test_result_fail("We have read access, but we shouldn't\n");
+	else if (!can_read && vsyscall_map_r)
+		ksft_test_result_fail("We don't have read access, but we should\n");
+	else if (can_read)
+		ksft_test_result_pass("We have read access\n");
+	else
+		ksft_test_result_pass("We do not have read access: #PF(0x%lx)\n", segv_err);
 }
 
-static int test_vsys_x(void)
+static void test_vsys_x(void)
 {
-#ifdef __x86_64__
 	if (vsyscall_map_x) {
 		/* We already tested this adequately. */
-		return 0;
+		ksft_test_result_pass("vsyscall_map_x is true\n");
+		return;
 	}
 
-	printf("[RUN]\tMake sure that vsyscalls really page fault\n");
+	ksft_print_msg("Make sure that vsyscalls really page fault\n");
 
 	bool can_exec;
 	if (sigsetjmp(jmpbuf, 1) == 0) {
@@ -443,20 +375,14 @@ static int test_vsys_x(void)
 		can_exec = false;
 	}
 
-	if (can_exec) {
-		printf("[FAIL]\tExecuting the vsyscall did not page fault\n");
-		return 1;
-	} else if (segv_err & (1 << 4)) { /* INSTR */
-		printf("[OK]\tExecuting the vsyscall page failed: #PF(0x%lx)\n",
-		       segv_err);
-	} else {
-		printf("[FAIL]\tExecution failed with the wrong error: #PF(0x%lx)\n",
-		       segv_err);
-		return 1;
-	}
-#endif
-
-	return 0;
+	if (can_exec)
+		ksft_test_result_fail("Executing the vsyscall did not page fault\n");
+	else if (segv_err & (1 << 4)) /* INSTR */
+		ksft_test_result_pass("Executing the vsyscall page failed: #PF(0x%lx)\n",
+				      segv_err);
+	else
+		ksft_test_result_fail("Execution failed with the wrong error: #PF(0x%lx)\n",
+				      segv_err);
 }
 
 /*
@@ -470,14 +396,13 @@ static int test_vsys_x(void)
  * fact that ptrace() ever worked was a nice courtesy of old kernels,
  * but the code to support it is fairly gross.
  */
-static int test_process_vm_readv(void)
+static void test_process_vm_readv(void)
 {
-#ifdef __x86_64__
 	char buf[4096];
 	struct iovec local, remote;
 	int ret;
 
-	printf("[RUN]\tprocess_vm_readv() from vsyscall page\n");
+	ksft_print_msg("process_vm_readv() from vsyscall page\n");
 
 	local.iov_base = buf;
 	local.iov_len = 4096;
@@ -489,27 +414,71 @@ static int test_process_vm_readv(void)
 		 * We expect process_vm_readv() to work if and only if the
 		 * vsyscall page is readable.
 		 */
-		printf("[%s]\tprocess_vm_readv() failed (ret = %d, errno = %d)\n", vsyscall_map_r ? "FAIL" : "OK", ret, errno);
-		return vsyscall_map_r ? 1 : 0;
+		ksft_test_result(!vsyscall_map_r,
+				 "process_vm_readv() failed (ret = %d, errno = %d)\n", ret, errno);
+		return;
 	}
 
-	if (vsyscall_map_r) {
-		if (!memcmp(buf, remote.iov_base, sizeof(buf))) {
-			printf("[OK]\tIt worked and read correct data\n");
-		} else {
-			printf("[FAIL]\tIt worked but returned incorrect data\n");
-			return 1;
+	if (vsyscall_map_r)
+		ksft_test_result(!memcmp(buf, remote.iov_base, sizeof(buf)), "Read data\n");
+	else
+		ksft_test_result_fail("process_rm_readv() succeeded, but it should have failed in this configuration\n");
+}
+
+static void init_vsys(void)
+{
+	int nerrs = 0;
+	FILE *maps;
+	char line[MAPS_LINE_LEN];
+	bool found = false;
+
+	maps = fopen("/proc/self/maps", "r");
+	if (!maps) {
+		ksft_test_result_skip("Could not open /proc/self/maps -- assuming vsyscall is r-x\n");
+		vsyscall_map_r = true;
+		return;
+	}
+
+	while (fgets(line, MAPS_LINE_LEN, maps)) {
+		char r, x;
+		void *start, *end;
+		char name[MAPS_LINE_LEN];
+
+		/* sscanf() is safe here as strlen(name) >= strlen(line) */
+		if (sscanf(line, "%p-%p %c-%cp %*x %*x:%*x %*u %s",
+			   &start, &end, &r, &x, name) != 5)
+			continue;
+
+		if (strcmp(name, "[vsyscall]"))
+			continue;
+
+		ksft_print_msg("vsyscall map: %s", line);
+
+		if (start != (void *)0xffffffffff600000 ||
+		    end != (void *)0xffffffffff601000) {
+			ksft_print_msg("address range is nonsense\n");
+			nerrs++;
 		}
-	} else {
-		printf("[FAIL]\tprocess_rm_readv() succeeded, but it should have failed in this configuration\n");
-		return 1;
+
+		ksft_print_msg("vsyscall permissions are %c-%c\n", r, x);
+		vsyscall_map_r = (r == 'r');
+		vsyscall_map_x = (x == 'x');
+
+		found = true;
+		break;
 	}
-#endif
 
-	return 0;
+	fclose(maps);
+
+	if (!found) {
+		ksft_print_msg("no vsyscall map in /proc/self/maps\n");
+		vsyscall_map_r = false;
+		vsyscall_map_x = false;
+	}
+
+	ksft_test_result(!nerrs, "vsyscall map\n");
 }
 
-#ifdef __x86_64__
 static volatile sig_atomic_t num_vsyscall_traps;
 
 static void sigtrap(int sig, siginfo_t *info, void *ctx_void)
@@ -521,15 +490,17 @@ static void sigtrap(int sig, siginfo_t *info, void *ctx_void)
 		num_vsyscall_traps++;
 }
 
-static int test_emulation(void)
+static void test_emulation(void)
 {
 	time_t tmp;
 	bool is_native;
 
-	if (!vsyscall_map_x)
-		return 0;
+	if (!vsyscall_map_x) {
+		ksft_test_result_skip("vsyscall_map_x isn't set\n");
+		return;
+	}
 
-	printf("[RUN]\tchecking that vsyscalls are emulated\n");
+	ksft_print_msg("checking that vsyscalls are emulated\n");
 	sethandler(SIGTRAP, sigtrap, 0);
 	set_eflags(get_eflags() | X86_EFLAGS_TF);
 	vtime(&tmp);
@@ -545,36 +516,35 @@ static int test_emulation(void)
 	 */
 	is_native = (num_vsyscall_traps > 1);
 
-	printf("[%s]\tvsyscalls are %s (%d instructions in vsyscall page)\n",
-	       (is_native ? "FAIL" : "OK"),
-	       (is_native ? "native" : "emulated"),
-	       (int)num_vsyscall_traps);
-
-	return is_native;
+	ksft_test_result(!is_native, "vsyscalls are %s (%d instructions in vsyscall page)\n",
+			 (is_native ? "native" : "emulated"), (int)num_vsyscall_traps);
 }
 #endif
 
 int main(int argc, char **argv)
 {
-	int nerrs = 0;
+	int total_tests = TOTAL_TESTS;
 
-	init_vdso();
-	nerrs += init_vsys();
+	ksft_print_header();
+	ksft_set_plan(total_tests);
 
-	nerrs += test_gtod();
-	nerrs += test_time();
-	nerrs += test_getcpu(0);
-	nerrs += test_getcpu(1);
-
-	sethandler(SIGSEGV, sigsegv, 0);
-	nerrs += test_vsys_r();
-	nerrs += test_vsys_x();
+	init_vdso();
+#ifdef __x86_64__
+	init_vsys();
+#endif
 
-	nerrs += test_process_vm_readv();
+	test_gtod();
+	test_time();
+	test_getcpu(0);
+	test_getcpu(1);
 
 #ifdef __x86_64__
-	nerrs += test_emulation();
+	sethandler(SIGSEGV, sigsegv, 0);
+	test_vsys_r();
+	test_vsys_x();
+	test_process_vm_readv();
+	test_emulation();
 #endif
 
-	return nerrs ? 1 : 0;
+	ksft_finished();
 }
-- 
2.39.2

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