1352909b4SAndy Lutomirski /* SPDX-License-Identifier: GPL-2.0 */
2352909b4SAndy Lutomirski
3352909b4SAndy Lutomirski #define _GNU_SOURCE
4352909b4SAndy Lutomirski
5352909b4SAndy Lutomirski #include <stdio.h>
6352909b4SAndy Lutomirski #include <sys/time.h>
7352909b4SAndy Lutomirski #include <time.h>
8352909b4SAndy Lutomirski #include <stdlib.h>
9352909b4SAndy Lutomirski #include <sys/syscall.h>
10352909b4SAndy Lutomirski #include <unistd.h>
11352909b4SAndy Lutomirski #include <dlfcn.h>
12352909b4SAndy Lutomirski #include <string.h>
13352909b4SAndy Lutomirski #include <inttypes.h>
14352909b4SAndy Lutomirski #include <signal.h>
15352909b4SAndy Lutomirski #include <sys/ucontext.h>
16352909b4SAndy Lutomirski #include <errno.h>
17352909b4SAndy Lutomirski #include <err.h>
18352909b4SAndy Lutomirski #include <sched.h>
19352909b4SAndy Lutomirski #include <stdbool.h>
20352909b4SAndy Lutomirski #include <setjmp.h>
217f0a5e07SAndy Lutomirski #include <sys/uio.h>
22352909b4SAndy Lutomirski
23cced0b24SAndy Lutomirski #include "helpers.h"
24113ad23fSMuhammad Usama Anjum #include "../kselftest.h"
25cced0b24SAndy Lutomirski
26352909b4SAndy Lutomirski #ifdef __x86_64__
27*d17e752bSMuhammad Usama Anjum #define TOTAL_TESTS 13
28*d17e752bSMuhammad Usama Anjum #else
29*d17e752bSMuhammad Usama Anjum #define TOTAL_TESTS 8
30*d17e752bSMuhammad Usama Anjum #endif
31*d17e752bSMuhammad Usama Anjum
32*d17e752bSMuhammad Usama Anjum #ifdef __x86_64__
33352909b4SAndy Lutomirski # define VSYS(x) (x)
34352909b4SAndy Lutomirski #else
35352909b4SAndy Lutomirski # define VSYS(x) 0
36352909b4SAndy Lutomirski #endif
37352909b4SAndy Lutomirski
38352909b4SAndy Lutomirski #ifndef SYS_getcpu
39352909b4SAndy Lutomirski # ifdef __x86_64__
40352909b4SAndy Lutomirski # define SYS_getcpu 309
41352909b4SAndy Lutomirski # else
42352909b4SAndy Lutomirski # define SYS_getcpu 318
43352909b4SAndy Lutomirski # endif
44352909b4SAndy Lutomirski #endif
45352909b4SAndy Lutomirski
46d8e92de8SDominik Brodowski /* max length of lines in /proc/self/maps - anything longer is skipped here */
47d8e92de8SDominik Brodowski #define MAPS_LINE_LEN 128
48d8e92de8SDominik Brodowski
49352909b4SAndy Lutomirski /* vsyscalls and vDSO */
50b0386979SAndy Lutomirski bool vsyscall_map_r = false, vsyscall_map_x = false;
51352909b4SAndy Lutomirski
52352909b4SAndy Lutomirski typedef long (*gtod_t)(struct timeval *tv, struct timezone *tz);
53b0386979SAndy Lutomirski const gtod_t vgtod = (gtod_t)VSYS(0xffffffffff600000);
54352909b4SAndy Lutomirski gtod_t vdso_gtod;
55352909b4SAndy Lutomirski
56352909b4SAndy Lutomirski typedef int (*vgettime_t)(clockid_t, struct timespec *);
57352909b4SAndy Lutomirski vgettime_t vdso_gettime;
58352909b4SAndy Lutomirski
59352909b4SAndy Lutomirski typedef long (*time_func_t)(time_t *t);
60b0386979SAndy Lutomirski const time_func_t vtime = (time_func_t)VSYS(0xffffffffff600400);
61352909b4SAndy Lutomirski time_func_t vdso_time;
62352909b4SAndy Lutomirski
63352909b4SAndy Lutomirski typedef long (*getcpu_t)(unsigned *, unsigned *, void *);
64b0386979SAndy Lutomirski const getcpu_t vgetcpu = (getcpu_t)VSYS(0xffffffffff600800);
65352909b4SAndy Lutomirski getcpu_t vdso_getcpu;
66352909b4SAndy Lutomirski
init_vdso(void)67352909b4SAndy Lutomirski static void init_vdso(void)
68352909b4SAndy Lutomirski {
69352909b4SAndy Lutomirski void *vdso = dlopen("linux-vdso.so.1", RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
70352909b4SAndy Lutomirski if (!vdso)
71352909b4SAndy Lutomirski vdso = dlopen("linux-gate.so.1", RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
72352909b4SAndy Lutomirski if (!vdso) {
73*d17e752bSMuhammad Usama Anjum ksft_print_msg("[WARN] failed to find vDSO\n");
74352909b4SAndy Lutomirski return;
75352909b4SAndy Lutomirski }
76352909b4SAndy Lutomirski
77352909b4SAndy Lutomirski vdso_gtod = (gtod_t)dlsym(vdso, "__vdso_gettimeofday");
78352909b4SAndy Lutomirski if (!vdso_gtod)
79*d17e752bSMuhammad Usama Anjum ksft_print_msg("[WARN] failed to find gettimeofday in vDSO\n");
80352909b4SAndy Lutomirski
81352909b4SAndy Lutomirski vdso_gettime = (vgettime_t)dlsym(vdso, "__vdso_clock_gettime");
82352909b4SAndy Lutomirski if (!vdso_gettime)
83*d17e752bSMuhammad Usama Anjum ksft_print_msg("[WARN] failed to find clock_gettime in vDSO\n");
84352909b4SAndy Lutomirski
85352909b4SAndy Lutomirski vdso_time = (time_func_t)dlsym(vdso, "__vdso_time");
86352909b4SAndy Lutomirski if (!vdso_time)
87*d17e752bSMuhammad Usama Anjum ksft_print_msg("[WARN] failed to find time in vDSO\n");
88352909b4SAndy Lutomirski
89352909b4SAndy Lutomirski vdso_getcpu = (getcpu_t)dlsym(vdso, "__vdso_getcpu");
905646bbd6SSebastian Andrzej Siewior if (!vdso_getcpu)
91*d17e752bSMuhammad Usama Anjum ksft_print_msg("[WARN] failed to find getcpu in vDSO\n");
92352909b4SAndy Lutomirski }
93352909b4SAndy Lutomirski
94352909b4SAndy Lutomirski /* syscalls */
sys_gtod(struct timeval * tv,struct timezone * tz)95352909b4SAndy Lutomirski static inline long sys_gtod(struct timeval *tv, struct timezone *tz)
96352909b4SAndy Lutomirski {
97352909b4SAndy Lutomirski return syscall(SYS_gettimeofday, tv, tz);
98352909b4SAndy Lutomirski }
99352909b4SAndy Lutomirski
sys_clock_gettime(clockid_t id,struct timespec * ts)100352909b4SAndy Lutomirski static inline int sys_clock_gettime(clockid_t id, struct timespec *ts)
101352909b4SAndy Lutomirski {
102352909b4SAndy Lutomirski return syscall(SYS_clock_gettime, id, ts);
103352909b4SAndy Lutomirski }
104352909b4SAndy Lutomirski
sys_time(time_t * t)105352909b4SAndy Lutomirski static inline long sys_time(time_t *t)
106352909b4SAndy Lutomirski {
107352909b4SAndy Lutomirski return syscall(SYS_time, t);
108352909b4SAndy Lutomirski }
109352909b4SAndy Lutomirski
sys_getcpu(unsigned * cpu,unsigned * node,void * cache)110352909b4SAndy Lutomirski static inline long sys_getcpu(unsigned * cpu, unsigned * node,
111352909b4SAndy Lutomirski void* cache)
112352909b4SAndy Lutomirski {
113352909b4SAndy Lutomirski return syscall(SYS_getcpu, cpu, node, cache);
114352909b4SAndy Lutomirski }
115352909b4SAndy Lutomirski
tv_diff(const struct timeval * a,const struct timeval * b)116352909b4SAndy Lutomirski static double tv_diff(const struct timeval *a, const struct timeval *b)
117352909b4SAndy Lutomirski {
118352909b4SAndy Lutomirski return (double)(a->tv_sec - b->tv_sec) +
119352909b4SAndy Lutomirski (double)((int)a->tv_usec - (int)b->tv_usec) * 1e-6;
120352909b4SAndy Lutomirski }
121352909b4SAndy Lutomirski
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)122*d17e752bSMuhammad Usama Anjum static void check_gtod(const struct timeval *tv_sys1,
123352909b4SAndy Lutomirski const struct timeval *tv_sys2,
124352909b4SAndy Lutomirski const struct timezone *tz_sys,
125352909b4SAndy Lutomirski const char *which,
126352909b4SAndy Lutomirski const struct timeval *tv_other,
127352909b4SAndy Lutomirski const struct timezone *tz_other)
128352909b4SAndy Lutomirski {
129352909b4SAndy Lutomirski double d1, d2;
130352909b4SAndy Lutomirski
131*d17e752bSMuhammad Usama Anjum if (tz_other && (tz_sys->tz_minuteswest != tz_other->tz_minuteswest ||
132*d17e752bSMuhammad Usama Anjum tz_sys->tz_dsttime != tz_other->tz_dsttime))
133*d17e752bSMuhammad Usama Anjum ksft_print_msg("%s tz mismatch\n", which);
134352909b4SAndy Lutomirski
135352909b4SAndy Lutomirski d1 = tv_diff(tv_other, tv_sys1);
136352909b4SAndy Lutomirski d2 = tv_diff(tv_sys2, tv_other);
137352909b4SAndy Lutomirski
138*d17e752bSMuhammad Usama Anjum ksft_print_msg("%s time offsets: %lf %lf\n", which, d1, d2);
139*d17e752bSMuhammad Usama Anjum
140*d17e752bSMuhammad Usama Anjum ksft_test_result(!(d1 < 0 || d2 < 0), "%s gettimeofday()'s timeval\n", which);
141352909b4SAndy Lutomirski }
142352909b4SAndy Lutomirski
test_gtod(void)143*d17e752bSMuhammad Usama Anjum static void test_gtod(void)
144352909b4SAndy Lutomirski {
145352909b4SAndy Lutomirski struct timeval tv_sys1, tv_sys2, tv_vdso, tv_vsys;
146352909b4SAndy Lutomirski struct timezone tz_sys, tz_vdso, tz_vsys;
147352909b4SAndy Lutomirski long ret_vdso = -1;
148352909b4SAndy Lutomirski long ret_vsys = -1;
149352909b4SAndy Lutomirski
150*d17e752bSMuhammad Usama Anjum ksft_print_msg("test gettimeofday()\n");
151352909b4SAndy Lutomirski
152352909b4SAndy Lutomirski if (sys_gtod(&tv_sys1, &tz_sys) != 0)
153*d17e752bSMuhammad Usama Anjum ksft_exit_fail_msg("syscall gettimeofday: %s\n", strerror(errno));
154352909b4SAndy Lutomirski if (vdso_gtod)
155352909b4SAndy Lutomirski ret_vdso = vdso_gtod(&tv_vdso, &tz_vdso);
156b0386979SAndy Lutomirski if (vsyscall_map_x)
157352909b4SAndy Lutomirski ret_vsys = vgtod(&tv_vsys, &tz_vsys);
158352909b4SAndy Lutomirski if (sys_gtod(&tv_sys2, &tz_sys) != 0)
159*d17e752bSMuhammad Usama Anjum ksft_exit_fail_msg("syscall gettimeofday: %s\n", strerror(errno));
160352909b4SAndy Lutomirski
161352909b4SAndy Lutomirski if (vdso_gtod) {
162*d17e752bSMuhammad Usama Anjum if (ret_vdso == 0)
163*d17e752bSMuhammad Usama Anjum check_gtod(&tv_sys1, &tv_sys2, &tz_sys, "vDSO", &tv_vdso, &tz_vdso);
164*d17e752bSMuhammad Usama Anjum else
165*d17e752bSMuhammad Usama Anjum ksft_test_result_fail("vDSO gettimeofday() failed: %ld\n", ret_vdso);
166352909b4SAndy Lutomirski } else {
167*d17e752bSMuhammad Usama Anjum ksft_test_result_skip("vdso_gtod isn't set\n");
168352909b4SAndy Lutomirski }
169352909b4SAndy Lutomirski
170b0386979SAndy Lutomirski if (vsyscall_map_x) {
171*d17e752bSMuhammad Usama Anjum if (ret_vsys == 0)
172*d17e752bSMuhammad Usama Anjum check_gtod(&tv_sys1, &tv_sys2, &tz_sys, "vsyscall", &tv_vsys, &tz_vsys);
173*d17e752bSMuhammad Usama Anjum else
174*d17e752bSMuhammad Usama Anjum ksft_test_result_fail("vsys gettimeofday() failed: %ld\n", ret_vsys);
175352909b4SAndy Lutomirski } else {
176*d17e752bSMuhammad Usama Anjum ksft_test_result_skip("vsyscall_map_x isn't set\n");
177352909b4SAndy Lutomirski }
178352909b4SAndy Lutomirski }
179352909b4SAndy Lutomirski
test_time(void)180*d17e752bSMuhammad Usama Anjum static void test_time(void)
181*d17e752bSMuhammad Usama Anjum {
182352909b4SAndy Lutomirski long t_sys1, t_sys2, t_vdso = 0, t_vsys = 0;
183352909b4SAndy Lutomirski long t2_sys1 = -1, t2_sys2 = -1, t2_vdso = -1, t2_vsys = -1;
184*d17e752bSMuhammad Usama Anjum
185*d17e752bSMuhammad Usama Anjum ksft_print_msg("test time()\n");
186352909b4SAndy Lutomirski t_sys1 = sys_time(&t2_sys1);
187352909b4SAndy Lutomirski if (vdso_time)
188352909b4SAndy Lutomirski t_vdso = vdso_time(&t2_vdso);
189b0386979SAndy Lutomirski if (vsyscall_map_x)
190352909b4SAndy Lutomirski t_vsys = vtime(&t2_vsys);
191352909b4SAndy Lutomirski t_sys2 = sys_time(&t2_sys2);
192352909b4SAndy Lutomirski if (t_sys1 < 0 || t_sys1 != t2_sys1 || t_sys2 < 0 || t_sys2 != t2_sys2) {
193*d17e752bSMuhammad Usama Anjum ksft_print_msg("syscall failed (ret1:%ld output1:%ld ret2:%ld output2:%ld)\n",
194*d17e752bSMuhammad Usama Anjum t_sys1, t2_sys1, t_sys2, t2_sys2);
195*d17e752bSMuhammad Usama Anjum ksft_test_result_skip("vdso_time\n");
196*d17e752bSMuhammad Usama Anjum ksft_test_result_skip("vdso_time\n");
197*d17e752bSMuhammad Usama Anjum return;
198352909b4SAndy Lutomirski }
199352909b4SAndy Lutomirski
200352909b4SAndy Lutomirski if (vdso_time) {
201*d17e752bSMuhammad Usama Anjum if (t_vdso < 0 || t_vdso != t2_vdso)
202*d17e752bSMuhammad Usama Anjum ksft_test_result_fail("vDSO failed (ret:%ld output:%ld)\n",
203*d17e752bSMuhammad Usama Anjum t_vdso, t2_vdso);
204*d17e752bSMuhammad Usama Anjum else if (t_vdso < t_sys1 || t_vdso > t_sys2)
205*d17e752bSMuhammad Usama Anjum ksft_test_result_fail("vDSO returned the wrong time (%ld %ld %ld)\n",
206*d17e752bSMuhammad Usama Anjum t_sys1, t_vdso, t_sys2);
207*d17e752bSMuhammad Usama Anjum else
208*d17e752bSMuhammad Usama Anjum ksft_test_result_pass("vDSO time() is okay\n");
209352909b4SAndy Lutomirski } else {
210*d17e752bSMuhammad Usama Anjum ksft_test_result_skip("vdso_time isn't set\n");
211352909b4SAndy Lutomirski }
212352909b4SAndy Lutomirski
213b0386979SAndy Lutomirski if (vsyscall_map_x) {
214*d17e752bSMuhammad Usama Anjum if (t_vsys < 0 || t_vsys != t2_vsys)
215*d17e752bSMuhammad Usama Anjum ksft_test_result_fail("vsyscall failed (ret:%ld output:%ld)\n",
216*d17e752bSMuhammad Usama Anjum t_vsys, t2_vsys);
217*d17e752bSMuhammad Usama Anjum else if (t_vsys < t_sys1 || t_vsys > t_sys2)
218*d17e752bSMuhammad Usama Anjum ksft_test_result_fail("vsyscall returned the wrong time (%ld %ld %ld)\n",
219*d17e752bSMuhammad Usama Anjum t_sys1, t_vsys, t_sys2);
220*d17e752bSMuhammad Usama Anjum else
221*d17e752bSMuhammad Usama Anjum ksft_test_result_pass("vsyscall time() is okay\n");
222352909b4SAndy Lutomirski } else {
223*d17e752bSMuhammad Usama Anjum ksft_test_result_skip("vsyscall_map_x isn't set\n");
224352909b4SAndy Lutomirski }
225352909b4SAndy Lutomirski }
226352909b4SAndy Lutomirski
test_getcpu(int cpu)227*d17e752bSMuhammad Usama Anjum static void test_getcpu(int cpu)
228352909b4SAndy Lutomirski {
229*d17e752bSMuhammad Usama Anjum unsigned int cpu_sys, cpu_vdso, cpu_vsys, node_sys, node_vdso, node_vsys;
230352909b4SAndy Lutomirski long ret_sys, ret_vdso = -1, ret_vsys = -1;
231*d17e752bSMuhammad Usama Anjum unsigned int node = 0;
232*d17e752bSMuhammad Usama Anjum bool have_node = false;
233352909b4SAndy Lutomirski cpu_set_t cpuset;
234*d17e752bSMuhammad Usama Anjum
235*d17e752bSMuhammad Usama Anjum ksft_print_msg("getcpu() on CPU %d\n", cpu);
236*d17e752bSMuhammad Usama Anjum
237352909b4SAndy Lutomirski CPU_ZERO(&cpuset);
238352909b4SAndy Lutomirski CPU_SET(cpu, &cpuset);
239352909b4SAndy Lutomirski if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0) {
240*d17e752bSMuhammad Usama Anjum ksft_print_msg("failed to force CPU %d\n", cpu);
241*d17e752bSMuhammad Usama Anjum ksft_test_result_skip("vdso_getcpu\n");
242*d17e752bSMuhammad Usama Anjum ksft_test_result_skip("vsyscall_map_x\n");
243*d17e752bSMuhammad Usama Anjum
244*d17e752bSMuhammad Usama Anjum return;
245352909b4SAndy Lutomirski }
246352909b4SAndy Lutomirski
247352909b4SAndy Lutomirski ret_sys = sys_getcpu(&cpu_sys, &node_sys, 0);
248352909b4SAndy Lutomirski if (vdso_getcpu)
249352909b4SAndy Lutomirski ret_vdso = vdso_getcpu(&cpu_vdso, &node_vdso, 0);
250b0386979SAndy Lutomirski if (vsyscall_map_x)
251352909b4SAndy Lutomirski ret_vsys = vgetcpu(&cpu_vsys, &node_vsys, 0);
252352909b4SAndy Lutomirski
253352909b4SAndy Lutomirski if (ret_sys == 0) {
254*d17e752bSMuhammad Usama Anjum if (cpu_sys != cpu)
255*d17e752bSMuhammad Usama Anjum ksft_print_msg("syscall reported CPU %hu but should be %d\n",
256*d17e752bSMuhammad Usama Anjum cpu_sys, cpu);
257352909b4SAndy Lutomirski
258352909b4SAndy Lutomirski have_node = true;
259352909b4SAndy Lutomirski node = node_sys;
260352909b4SAndy Lutomirski }
261352909b4SAndy Lutomirski
262352909b4SAndy Lutomirski if (vdso_getcpu) {
263352909b4SAndy Lutomirski if (ret_vdso) {
264*d17e752bSMuhammad Usama Anjum ksft_test_result_fail("vDSO getcpu() failed\n");
265352909b4SAndy Lutomirski } else {
266352909b4SAndy Lutomirski if (!have_node) {
267352909b4SAndy Lutomirski have_node = true;
268352909b4SAndy Lutomirski node = node_vdso;
269352909b4SAndy Lutomirski }
270352909b4SAndy Lutomirski
271*d17e752bSMuhammad Usama Anjum if (cpu_vdso != cpu || node_vdso != node) {
272*d17e752bSMuhammad Usama Anjum if (cpu_vdso != cpu)
273*d17e752bSMuhammad Usama Anjum ksft_print_msg("vDSO reported CPU %hu but should be %d\n",
274*d17e752bSMuhammad Usama Anjum cpu_vdso, cpu);
275*d17e752bSMuhammad Usama Anjum if (node_vdso != node)
276*d17e752bSMuhammad Usama Anjum ksft_print_msg("vDSO reported node %hu but should be %hu\n",
277*d17e752bSMuhammad Usama Anjum node_vdso, node);
278*d17e752bSMuhammad Usama Anjum ksft_test_result_fail("Wrong values\n");
279352909b4SAndy Lutomirski } else {
280*d17e752bSMuhammad Usama Anjum ksft_test_result_pass("vDSO reported correct CPU and node\n");
281352909b4SAndy Lutomirski }
282*d17e752bSMuhammad Usama Anjum }
283352909b4SAndy Lutomirski } else {
284*d17e752bSMuhammad Usama Anjum ksft_test_result_skip("vdso_getcpu isn't set\n");
285352909b4SAndy Lutomirski }
286352909b4SAndy Lutomirski
287b0386979SAndy Lutomirski if (vsyscall_map_x) {
288352909b4SAndy Lutomirski if (ret_vsys) {
289*d17e752bSMuhammad Usama Anjum ksft_test_result_fail("vsyscall getcpu() failed\n");
290352909b4SAndy Lutomirski } else {
291352909b4SAndy Lutomirski if (!have_node) {
292352909b4SAndy Lutomirski have_node = true;
293352909b4SAndy Lutomirski node = node_vsys;
294352909b4SAndy Lutomirski }
295352909b4SAndy Lutomirski
296*d17e752bSMuhammad Usama Anjum if (cpu_vsys != cpu || node_vsys != node) {
297*d17e752bSMuhammad Usama Anjum if (cpu_vsys != cpu)
298*d17e752bSMuhammad Usama Anjum ksft_print_msg("vsyscall reported CPU %hu but should be %d\n",
299*d17e752bSMuhammad Usama Anjum cpu_vsys, cpu);
300*d17e752bSMuhammad Usama Anjum if (node_vsys != node)
301*d17e752bSMuhammad Usama Anjum ksft_print_msg("vsyscall reported node %hu but should be %hu\n",
302*d17e752bSMuhammad Usama Anjum node_vsys, node);
303*d17e752bSMuhammad Usama Anjum ksft_test_result_fail("Wrong values\n");
304352909b4SAndy Lutomirski } else {
305*d17e752bSMuhammad Usama Anjum ksft_test_result_pass("vsyscall reported correct CPU and node\n");
306352909b4SAndy Lutomirski }
307*d17e752bSMuhammad Usama Anjum }
308352909b4SAndy Lutomirski } else {
309*d17e752bSMuhammad Usama Anjum ksft_test_result_skip("vsyscall_map_x isn't set\n");
310352909b4SAndy Lutomirski }
311352909b4SAndy Lutomirski }
312352909b4SAndy Lutomirski
313113ad23fSMuhammad Usama Anjum #ifdef __x86_64__
314113ad23fSMuhammad Usama Anjum
315113ad23fSMuhammad Usama Anjum static jmp_buf jmpbuf;
316113ad23fSMuhammad Usama Anjum static volatile unsigned long segv_err;
317113ad23fSMuhammad Usama Anjum
sethandler(int sig,void (* handler)(int,siginfo_t *,void *),int flags)318113ad23fSMuhammad Usama Anjum static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
319113ad23fSMuhammad Usama Anjum int flags)
320113ad23fSMuhammad Usama Anjum {
321113ad23fSMuhammad Usama Anjum struct sigaction sa;
322*d17e752bSMuhammad Usama Anjum
323113ad23fSMuhammad Usama Anjum memset(&sa, 0, sizeof(sa));
324113ad23fSMuhammad Usama Anjum sa.sa_sigaction = handler;
325113ad23fSMuhammad Usama Anjum sa.sa_flags = SA_SIGINFO | flags;
326113ad23fSMuhammad Usama Anjum sigemptyset(&sa.sa_mask);
327113ad23fSMuhammad Usama Anjum if (sigaction(sig, &sa, 0))
328*d17e752bSMuhammad Usama Anjum ksft_exit_fail_msg("sigaction failed\n");
329113ad23fSMuhammad Usama Anjum }
330113ad23fSMuhammad Usama Anjum
sigsegv(int sig,siginfo_t * info,void * ctx_void)331113ad23fSMuhammad Usama Anjum static void sigsegv(int sig, siginfo_t *info, void *ctx_void)
332113ad23fSMuhammad Usama Anjum {
333113ad23fSMuhammad Usama Anjum ucontext_t *ctx = (ucontext_t *)ctx_void;
334113ad23fSMuhammad Usama Anjum
335113ad23fSMuhammad Usama Anjum segv_err = ctx->uc_mcontext.gregs[REG_ERR];
336113ad23fSMuhammad Usama Anjum siglongjmp(jmpbuf, 1);
337113ad23fSMuhammad Usama Anjum }
338113ad23fSMuhammad Usama Anjum
test_vsys_r(void)339*d17e752bSMuhammad Usama Anjum static void test_vsys_r(void)
340352909b4SAndy Lutomirski {
341*d17e752bSMuhammad Usama Anjum ksft_print_msg("Checking read access to the vsyscall page\n");
342352909b4SAndy Lutomirski bool can_read;
343352909b4SAndy Lutomirski if (sigsetjmp(jmpbuf, 1) == 0) {
344352909b4SAndy Lutomirski *(volatile int *)0xffffffffff600000;
345352909b4SAndy Lutomirski can_read = true;
346352909b4SAndy Lutomirski } else {
347352909b4SAndy Lutomirski can_read = false;
348352909b4SAndy Lutomirski }
349352909b4SAndy Lutomirski
350*d17e752bSMuhammad Usama Anjum if (can_read && !vsyscall_map_r)
351*d17e752bSMuhammad Usama Anjum ksft_test_result_fail("We have read access, but we shouldn't\n");
352*d17e752bSMuhammad Usama Anjum else if (!can_read && vsyscall_map_r)
353*d17e752bSMuhammad Usama Anjum ksft_test_result_fail("We don't have read access, but we should\n");
354*d17e752bSMuhammad Usama Anjum else if (can_read)
355*d17e752bSMuhammad Usama Anjum ksft_test_result_pass("We have read access\n");
356*d17e752bSMuhammad Usama Anjum else
357*d17e752bSMuhammad Usama Anjum ksft_test_result_pass("We do not have read access: #PF(0x%lx)\n", segv_err);
358352909b4SAndy Lutomirski }
359352909b4SAndy Lutomirski
test_vsys_x(void)360*d17e752bSMuhammad Usama Anjum static void test_vsys_x(void)
361b0386979SAndy Lutomirski {
362b0386979SAndy Lutomirski if (vsyscall_map_x) {
363b0386979SAndy Lutomirski /* We already tested this adequately. */
364*d17e752bSMuhammad Usama Anjum ksft_test_result_pass("vsyscall_map_x is true\n");
365*d17e752bSMuhammad Usama Anjum return;
366b0386979SAndy Lutomirski }
367b0386979SAndy Lutomirski
368*d17e752bSMuhammad Usama Anjum ksft_print_msg("Make sure that vsyscalls really page fault\n");
369b0386979SAndy Lutomirski
370b0386979SAndy Lutomirski bool can_exec;
371b0386979SAndy Lutomirski if (sigsetjmp(jmpbuf, 1) == 0) {
372b0386979SAndy Lutomirski vgtod(NULL, NULL);
373b0386979SAndy Lutomirski can_exec = true;
374b0386979SAndy Lutomirski } else {
375b0386979SAndy Lutomirski can_exec = false;
376b0386979SAndy Lutomirski }
377b0386979SAndy Lutomirski
378*d17e752bSMuhammad Usama Anjum if (can_exec)
379*d17e752bSMuhammad Usama Anjum ksft_test_result_fail("Executing the vsyscall did not page fault\n");
380*d17e752bSMuhammad Usama Anjum else if (segv_err & (1 << 4)) /* INSTR */
381*d17e752bSMuhammad Usama Anjum ksft_test_result_pass("Executing the vsyscall page failed: #PF(0x%lx)\n",
382b0386979SAndy Lutomirski segv_err);
383*d17e752bSMuhammad Usama Anjum else
384*d17e752bSMuhammad Usama Anjum ksft_test_result_fail("Execution failed with the wrong error: #PF(0x%lx)\n",
385b0386979SAndy Lutomirski segv_err);
386b0386979SAndy Lutomirski }
387352909b4SAndy Lutomirski
3888891adc6SAndy Lutomirski /*
3898891adc6SAndy Lutomirski * Debuggers expect ptrace() to be able to peek at the vsyscall page.
3908891adc6SAndy Lutomirski * Use process_vm_readv() as a proxy for ptrace() to test this. We
3918891adc6SAndy Lutomirski * want it to work in the vsyscall=emulate case and to fail in the
3928891adc6SAndy Lutomirski * vsyscall=xonly case.
3938891adc6SAndy Lutomirski *
3948891adc6SAndy Lutomirski * It's worth noting that this ABI is a bit nutty. write(2) can't
3958891adc6SAndy Lutomirski * read from the vsyscall page on any kernel version or mode. The
3968891adc6SAndy Lutomirski * fact that ptrace() ever worked was a nice courtesy of old kernels,
3978891adc6SAndy Lutomirski * but the code to support it is fairly gross.
3988891adc6SAndy Lutomirski */
test_process_vm_readv(void)399*d17e752bSMuhammad Usama Anjum static void test_process_vm_readv(void)
4007f0a5e07SAndy Lutomirski {
4017f0a5e07SAndy Lutomirski char buf[4096];
4027f0a5e07SAndy Lutomirski struct iovec local, remote;
4037f0a5e07SAndy Lutomirski int ret;
4047f0a5e07SAndy Lutomirski
405*d17e752bSMuhammad Usama Anjum ksft_print_msg("process_vm_readv() from vsyscall page\n");
4067f0a5e07SAndy Lutomirski
4077f0a5e07SAndy Lutomirski local.iov_base = buf;
4087f0a5e07SAndy Lutomirski local.iov_len = 4096;
4097f0a5e07SAndy Lutomirski remote.iov_base = (void *)0xffffffffff600000;
4107f0a5e07SAndy Lutomirski remote.iov_len = 4096;
4117f0a5e07SAndy Lutomirski ret = process_vm_readv(getpid(), &local, 1, &remote, 1, 0);
4127f0a5e07SAndy Lutomirski if (ret != 4096) {
4138891adc6SAndy Lutomirski /*
4148891adc6SAndy Lutomirski * We expect process_vm_readv() to work if and only if the
4158891adc6SAndy Lutomirski * vsyscall page is readable.
4168891adc6SAndy Lutomirski */
417*d17e752bSMuhammad Usama Anjum ksft_test_result(!vsyscall_map_r,
418*d17e752bSMuhammad Usama Anjum "process_vm_readv() failed (ret = %d, errno = %d)\n", ret, errno);
419*d17e752bSMuhammad Usama Anjum return;
4207f0a5e07SAndy Lutomirski }
4217f0a5e07SAndy Lutomirski
422*d17e752bSMuhammad Usama Anjum if (vsyscall_map_r)
423*d17e752bSMuhammad Usama Anjum ksft_test_result(!memcmp(buf, remote.iov_base, sizeof(buf)), "Read data\n");
424*d17e752bSMuhammad Usama Anjum else
425*d17e752bSMuhammad Usama Anjum ksft_test_result_fail("process_rm_readv() succeeded, but it should have failed in this configuration\n");
4267f0a5e07SAndy Lutomirski }
4277f0a5e07SAndy Lutomirski
init_vsys(void)428*d17e752bSMuhammad Usama Anjum static void init_vsys(void)
429113ad23fSMuhammad Usama Anjum {
430113ad23fSMuhammad Usama Anjum int nerrs = 0;
431113ad23fSMuhammad Usama Anjum FILE *maps;
432113ad23fSMuhammad Usama Anjum char line[MAPS_LINE_LEN];
433113ad23fSMuhammad Usama Anjum bool found = false;
434113ad23fSMuhammad Usama Anjum
435113ad23fSMuhammad Usama Anjum maps = fopen("/proc/self/maps", "r");
436113ad23fSMuhammad Usama Anjum if (!maps) {
437*d17e752bSMuhammad Usama Anjum ksft_test_result_skip("Could not open /proc/self/maps -- assuming vsyscall is r-x\n");
438113ad23fSMuhammad Usama Anjum vsyscall_map_r = true;
439*d17e752bSMuhammad Usama Anjum return;
440113ad23fSMuhammad Usama Anjum }
441113ad23fSMuhammad Usama Anjum
442113ad23fSMuhammad Usama Anjum while (fgets(line, MAPS_LINE_LEN, maps)) {
443113ad23fSMuhammad Usama Anjum char r, x;
444113ad23fSMuhammad Usama Anjum void *start, *end;
445113ad23fSMuhammad Usama Anjum char name[MAPS_LINE_LEN];
446113ad23fSMuhammad Usama Anjum
447113ad23fSMuhammad Usama Anjum /* sscanf() is safe here as strlen(name) >= strlen(line) */
448113ad23fSMuhammad Usama Anjum if (sscanf(line, "%p-%p %c-%cp %*x %*x:%*x %*u %s",
449113ad23fSMuhammad Usama Anjum &start, &end, &r, &x, name) != 5)
450113ad23fSMuhammad Usama Anjum continue;
451113ad23fSMuhammad Usama Anjum
452113ad23fSMuhammad Usama Anjum if (strcmp(name, "[vsyscall]"))
453113ad23fSMuhammad Usama Anjum continue;
454113ad23fSMuhammad Usama Anjum
455*d17e752bSMuhammad Usama Anjum ksft_print_msg("vsyscall map: %s", line);
456113ad23fSMuhammad Usama Anjum
457113ad23fSMuhammad Usama Anjum if (start != (void *)0xffffffffff600000 ||
458113ad23fSMuhammad Usama Anjum end != (void *)0xffffffffff601000) {
459*d17e752bSMuhammad Usama Anjum ksft_print_msg("address range is nonsense\n");
460113ad23fSMuhammad Usama Anjum nerrs++;
461113ad23fSMuhammad Usama Anjum }
462113ad23fSMuhammad Usama Anjum
463*d17e752bSMuhammad Usama Anjum ksft_print_msg("vsyscall permissions are %c-%c\n", r, x);
464113ad23fSMuhammad Usama Anjum vsyscall_map_r = (r == 'r');
465113ad23fSMuhammad Usama Anjum vsyscall_map_x = (x == 'x');
466113ad23fSMuhammad Usama Anjum
467113ad23fSMuhammad Usama Anjum found = true;
468113ad23fSMuhammad Usama Anjum break;
469113ad23fSMuhammad Usama Anjum }
470113ad23fSMuhammad Usama Anjum
471113ad23fSMuhammad Usama Anjum fclose(maps);
472113ad23fSMuhammad Usama Anjum
473113ad23fSMuhammad Usama Anjum if (!found) {
474*d17e752bSMuhammad Usama Anjum ksft_print_msg("no vsyscall map in /proc/self/maps\n");
475113ad23fSMuhammad Usama Anjum vsyscall_map_r = false;
476113ad23fSMuhammad Usama Anjum vsyscall_map_x = false;
477113ad23fSMuhammad Usama Anjum }
478113ad23fSMuhammad Usama Anjum
479*d17e752bSMuhammad Usama Anjum ksft_test_result(!nerrs, "vsyscall map\n");
480113ad23fSMuhammad Usama Anjum }
481113ad23fSMuhammad Usama Anjum
482352909b4SAndy Lutomirski static volatile sig_atomic_t num_vsyscall_traps;
483352909b4SAndy Lutomirski
sigtrap(int sig,siginfo_t * info,void * ctx_void)484352909b4SAndy Lutomirski static void sigtrap(int sig, siginfo_t *info, void *ctx_void)
485352909b4SAndy Lutomirski {
486352909b4SAndy Lutomirski ucontext_t *ctx = (ucontext_t *)ctx_void;
487352909b4SAndy Lutomirski unsigned long ip = ctx->uc_mcontext.gregs[REG_RIP];
488352909b4SAndy Lutomirski
489352909b4SAndy Lutomirski if (((ip ^ 0xffffffffff600000UL) & ~0xfffUL) == 0)
490352909b4SAndy Lutomirski num_vsyscall_traps++;
491352909b4SAndy Lutomirski }
492352909b4SAndy Lutomirski
test_emulation(void)493*d17e752bSMuhammad Usama Anjum static void test_emulation(void)
494352909b4SAndy Lutomirski {
495352909b4SAndy Lutomirski time_t tmp;
496352909b4SAndy Lutomirski bool is_native;
497352909b4SAndy Lutomirski
498*d17e752bSMuhammad Usama Anjum if (!vsyscall_map_x) {
499*d17e752bSMuhammad Usama Anjum ksft_test_result_skip("vsyscall_map_x isn't set\n");
500*d17e752bSMuhammad Usama Anjum return;
501*d17e752bSMuhammad Usama Anjum }
502352909b4SAndy Lutomirski
503*d17e752bSMuhammad Usama Anjum ksft_print_msg("checking that vsyscalls are emulated\n");
504352909b4SAndy Lutomirski sethandler(SIGTRAP, sigtrap, 0);
505352909b4SAndy Lutomirski set_eflags(get_eflags() | X86_EFLAGS_TF);
506352909b4SAndy Lutomirski vtime(&tmp);
507352909b4SAndy Lutomirski set_eflags(get_eflags() & ~X86_EFLAGS_TF);
508352909b4SAndy Lutomirski
509352909b4SAndy Lutomirski /*
510352909b4SAndy Lutomirski * If vsyscalls are emulated, we expect a single trap in the
511352909b4SAndy Lutomirski * vsyscall page -- the call instruction will trap with RIP
512352909b4SAndy Lutomirski * pointing to the entry point before emulation takes over.
513352909b4SAndy Lutomirski * In native mode, we expect two traps, since whatever code
514352909b4SAndy Lutomirski * the vsyscall page contains will be more than just a ret
515352909b4SAndy Lutomirski * instruction.
516352909b4SAndy Lutomirski */
517352909b4SAndy Lutomirski is_native = (num_vsyscall_traps > 1);
518352909b4SAndy Lutomirski
519*d17e752bSMuhammad Usama Anjum ksft_test_result(!is_native, "vsyscalls are %s (%d instructions in vsyscall page)\n",
520*d17e752bSMuhammad Usama Anjum (is_native ? "native" : "emulated"), (int)num_vsyscall_traps);
521352909b4SAndy Lutomirski }
522352909b4SAndy Lutomirski #endif
523352909b4SAndy Lutomirski
main(int argc,char ** argv)524352909b4SAndy Lutomirski int main(int argc, char **argv)
525352909b4SAndy Lutomirski {
526*d17e752bSMuhammad Usama Anjum int total_tests = TOTAL_TESTS;
527*d17e752bSMuhammad Usama Anjum
528*d17e752bSMuhammad Usama Anjum ksft_print_header();
529*d17e752bSMuhammad Usama Anjum ksft_set_plan(total_tests);
530352909b4SAndy Lutomirski
531352909b4SAndy Lutomirski init_vdso();
532113ad23fSMuhammad Usama Anjum #ifdef __x86_64__
533*d17e752bSMuhammad Usama Anjum init_vsys();
534113ad23fSMuhammad Usama Anjum #endif
535352909b4SAndy Lutomirski
536*d17e752bSMuhammad Usama Anjum test_gtod();
537*d17e752bSMuhammad Usama Anjum test_time();
538*d17e752bSMuhammad Usama Anjum test_getcpu(0);
539*d17e752bSMuhammad Usama Anjum test_getcpu(1);
540352909b4SAndy Lutomirski
541113ad23fSMuhammad Usama Anjum #ifdef __x86_64__
542352909b4SAndy Lutomirski sethandler(SIGSEGV, sigsegv, 0);
543*d17e752bSMuhammad Usama Anjum test_vsys_r();
544*d17e752bSMuhammad Usama Anjum test_vsys_x();
545*d17e752bSMuhammad Usama Anjum test_process_vm_readv();
546*d17e752bSMuhammad Usama Anjum test_emulation();
547352909b4SAndy Lutomirski #endif
548352909b4SAndy Lutomirski
549*d17e752bSMuhammad Usama Anjum ksft_finished();
550352909b4SAndy Lutomirski }
551