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git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - tools/testing/selftests/x86/ptrace_syscall.c
3 #include <sys/ptrace.h>
6 #include <sys/syscall.h>
14 #include <asm/ptrace-abi.h>
17 /* Bitness-agnostic defines for user_regs_struct fields. */
19 # define user_syscall_nr orig_rax
20 # define user_arg0 rdi
21 # define user_arg1 rsi
22 # define user_arg2 rdx
23 # define user_arg3 r10
29 # define user_syscall_nr orig_eax
30 # define user_arg0 ebx
31 # define user_arg1 ecx
32 # define user_arg2 edx
33 # define user_arg3 esi
34 # define user_arg4 edi
35 # define user_arg5 ebp
42 struct syscall_args32
{
43 uint32_t nr
, arg0
, arg1
, arg2
, arg3
, arg4
, arg5
;
47 extern void sys32_helper(struct syscall_args32
*, void *);
48 extern void int80_and_ret(void);
52 * Helper to invoke int80 with controlled regs and capture the final regs.
54 static void do_full_int80(struct syscall_args32
*args
)
57 register unsigned long bp
asm("bp") = args
->arg5
;
58 asm volatile ("int $0x80"
60 "+b" (args
->arg0
), "+c" (args
->arg1
), "+d" (args
->arg2
),
61 "+S" (args
->arg3
), "+D" (args
->arg4
), "+r" (bp
)
62 : : "r8", "r9", "r10", "r11");
65 sys32_helper(args
, int80_and_ret
);
70 static void (*vsyscall32
)(void);
73 * Nasty helper to invoke AT_SYSINFO (i.e. __kernel_vsyscall) with
74 * controlled regs and capture the final regs. This is so nasty that it
75 * crashes my copy of gdb :)
77 static void do_full_vsyscall32(struct syscall_args32
*args
)
79 sys32_helper(args
, vsyscall32
);
83 static siginfo_t
wait_trap(pid_t chld
)
86 if (waitid(P_PID
, chld
, &si
, WEXITED
|WSTOPPED
) != 0)
88 if (si
.si_pid
!= chld
)
89 errx(1, "got unexpected pid in event\n");
90 if (si
.si_code
!= CLD_TRAPPED
)
91 errx(1, "got unexpected event type %d\n", si
.si_code
);
95 static void sethandler(int sig
, void (*handler
)(int, siginfo_t
*, void *),
99 memset(&sa
, 0, sizeof(sa
));
100 sa
.sa_sigaction
= handler
;
101 sa
.sa_flags
= SA_SIGINFO
| flags
;
102 sigemptyset(&sa
.sa_mask
);
103 if (sigaction(sig
, &sa
, 0))
107 static void setsigign(int sig
, int flags
)
110 memset(&sa
, 0, sizeof(sa
));
111 sa
.sa_sigaction
= (void *)SIG_IGN
;
113 sigemptyset(&sa
.sa_mask
);
114 if (sigaction(sig
, &sa
, 0))
118 static void clearhandler(int sig
)
121 memset(&sa
, 0, sizeof(sa
));
122 sa
.sa_handler
= SIG_DFL
;
123 sigemptyset(&sa
.sa_mask
);
124 if (sigaction(sig
, &sa
, 0))
129 # define REG_BP REG_RBP
131 # define REG_BP REG_EBP
134 static void empty_handler(int sig
, siginfo_t
*si
, void *ctx_void
)
138 static void test_sys32_regs(void (*do_syscall
)(struct syscall_args32
*))
140 struct syscall_args32 args
= {
141 .nr
= 224, /* gettid */
142 .arg0
= 10, .arg1
= 11, .arg2
= 12,
143 .arg3
= 13, .arg4
= 14, .arg5
= 15,
148 if (args
.nr
!= getpid() ||
149 args
.arg0
!= 10 || args
.arg1
!= 11 || args
.arg2
!= 12 ||
150 args
.arg3
!= 13 || args
.arg4
!= 14 || args
.arg5
!= 15) {
151 printf("[FAIL]\tgetpid() failed to preserve regs\n");
154 printf("[OK]\tgetpid() preserves regs\n");
157 sethandler(SIGUSR1
, empty_handler
, 0);
159 args
.nr
= 37; /* kill */
160 args
.arg0
= getpid();
164 args
.arg0
!= getpid() || args
.arg1
!= SIGUSR1
|| args
.arg2
!= 12 ||
165 args
.arg3
!= 13 || args
.arg4
!= 14 || args
.arg5
!= 15) {
166 printf("[FAIL]\tkill(getpid(), SIGUSR1) failed to preserve regs\n");
169 printf("[OK]\tkill(getpid(), SIGUSR1) preserves regs\n");
171 clearhandler(SIGUSR1
);
174 static void test_ptrace_syscall_restart(void)
176 printf("[RUN]\tptrace-induced syscall restart\n");
182 if (ptrace(PTRACE_TRACEME
, 0, 0, 0) != 0)
183 err(1, "PTRACE_TRACEME");
185 printf("\tChild will make one syscall\n");
188 syscall(SYS_gettid
, 10, 11, 12, 13, 14, 15);
194 /* Wait for SIGSTOP. */
195 if (waitpid(chld
, &status
, 0) != chld
|| !WIFSTOPPED(status
))
198 struct user_regs_struct regs
;
200 printf("[RUN]\tSYSEMU\n");
201 if (ptrace(PTRACE_SYSEMU
, chld
, 0, 0) != 0)
202 err(1, "PTRACE_SYSEMU");
205 if (ptrace(PTRACE_GETREGS
, chld
, 0, ®s
) != 0)
206 err(1, "PTRACE_GETREGS");
208 if (regs
.user_syscall_nr
!= SYS_gettid
||
209 regs
.user_arg0
!= 10 || regs
.user_arg1
!= 11 ||
210 regs
.user_arg2
!= 12 || regs
.user_arg3
!= 13 ||
211 regs
.user_arg4
!= 14 || regs
.user_arg5
!= 15) {
212 printf("[FAIL]\tInitial args are wrong (nr=%lu, args=%lu %lu %lu %lu %lu %lu)\n", (unsigned long)regs
.user_syscall_nr
, (unsigned long)regs
.user_arg0
, (unsigned long)regs
.user_arg1
, (unsigned long)regs
.user_arg2
, (unsigned long)regs
.user_arg3
, (unsigned long)regs
.user_arg4
, (unsigned long)regs
.user_arg5
);
215 printf("[OK]\tInitial nr and args are correct\n");
218 printf("[RUN]\tRestart the syscall (ip = 0x%lx)\n",
219 (unsigned long)regs
.user_ip
);
222 * This does exactly what it appears to do if syscall is int80 or
223 * SYSCALL64. For SYSCALL32 or SYSENTER, though, this is highly
224 * magical. It needs to work so that ptrace and syscall restart
227 regs
.user_ax
= regs
.user_syscall_nr
;
229 if (ptrace(PTRACE_SETREGS
, chld
, 0, ®s
) != 0)
230 err(1, "PTRACE_SETREGS");
232 if (ptrace(PTRACE_SYSEMU
, chld
, 0, 0) != 0)
233 err(1, "PTRACE_SYSEMU");
236 if (ptrace(PTRACE_GETREGS
, chld
, 0, ®s
) != 0)
237 err(1, "PTRACE_GETREGS");
239 if (regs
.user_syscall_nr
!= SYS_gettid
||
240 regs
.user_arg0
!= 10 || regs
.user_arg1
!= 11 ||
241 regs
.user_arg2
!= 12 || regs
.user_arg3
!= 13 ||
242 regs
.user_arg4
!= 14 || regs
.user_arg5
!= 15) {
243 printf("[FAIL]\tRestart nr or args are wrong (nr=%lu, args=%lu %lu %lu %lu %lu %lu)\n", (unsigned long)regs
.user_syscall_nr
, (unsigned long)regs
.user_arg0
, (unsigned long)regs
.user_arg1
, (unsigned long)regs
.user_arg2
, (unsigned long)regs
.user_arg3
, (unsigned long)regs
.user_arg4
, (unsigned long)regs
.user_arg5
);
246 printf("[OK]\tRestarted nr and args are correct\n");
249 printf("[RUN]\tChange nr and args and restart the syscall (ip = 0x%lx)\n",
250 (unsigned long)regs
.user_ip
);
252 regs
.user_ax
= SYS_getpid
;
261 if (ptrace(PTRACE_SETREGS
, chld
, 0, ®s
) != 0)
262 err(1, "PTRACE_SETREGS");
264 if (ptrace(PTRACE_SYSEMU
, chld
, 0, 0) != 0)
265 err(1, "PTRACE_SYSEMU");
268 if (ptrace(PTRACE_GETREGS
, chld
, 0, ®s
) != 0)
269 err(1, "PTRACE_GETREGS");
271 if (regs
.user_syscall_nr
!= SYS_getpid
||
272 regs
.user_arg0
!= 20 || regs
.user_arg1
!= 21 || regs
.user_arg2
!= 22 ||
273 regs
.user_arg3
!= 23 || regs
.user_arg4
!= 24 || regs
.user_arg5
!= 25) {
274 printf("[FAIL]\tRestart nr or args are wrong (nr=%lu, args=%lu %lu %lu %lu %lu %lu)\n", (unsigned long)regs
.user_syscall_nr
, (unsigned long)regs
.user_arg0
, (unsigned long)regs
.user_arg1
, (unsigned long)regs
.user_arg2
, (unsigned long)regs
.user_arg3
, (unsigned long)regs
.user_arg4
, (unsigned long)regs
.user_arg5
);
277 printf("[OK]\tReplacement nr and args are correct\n");
280 if (ptrace(PTRACE_CONT
, chld
, 0, 0) != 0)
281 err(1, "PTRACE_CONT");
282 if (waitpid(chld
, &status
, 0) != chld
)
284 if (!WIFEXITED(status
) || WEXITSTATUS(status
) != 0) {
285 printf("[FAIL]\tChild failed\n");
288 printf("[OK]\tChild exited cleanly\n");
292 static void test_restart_under_ptrace(void)
294 printf("[RUN]\tkernel syscall restart under ptrace\n");
300 if (ptrace(PTRACE_TRACEME
, 0, 0, 0) != 0)
301 err(1, "PTRACE_TRACEME");
303 printf("\tChild will take a nap until signaled\n");
304 setsigign(SIGUSR1
, SA_RESTART
);
307 syscall(SYS_pause
, 0, 0, 0, 0, 0, 0);
313 /* Wait for SIGSTOP. */
314 if (waitpid(chld
, &status
, 0) != chld
|| !WIFSTOPPED(status
))
317 struct user_regs_struct regs
;
319 printf("[RUN]\tSYSCALL\n");
320 if (ptrace(PTRACE_SYSCALL
, chld
, 0, 0) != 0)
321 err(1, "PTRACE_SYSCALL");
324 /* We should be stopped at pause(2) entry. */
326 if (ptrace(PTRACE_GETREGS
, chld
, 0, ®s
) != 0)
327 err(1, "PTRACE_GETREGS");
329 if (regs
.user_syscall_nr
!= SYS_pause
||
330 regs
.user_arg0
!= 0 || regs
.user_arg1
!= 0 ||
331 regs
.user_arg2
!= 0 || regs
.user_arg3
!= 0 ||
332 regs
.user_arg4
!= 0 || regs
.user_arg5
!= 0) {
333 printf("[FAIL]\tInitial args are wrong (nr=%lu, args=%lu %lu %lu %lu %lu %lu)\n", (unsigned long)regs
.user_syscall_nr
, (unsigned long)regs
.user_arg0
, (unsigned long)regs
.user_arg1
, (unsigned long)regs
.user_arg2
, (unsigned long)regs
.user_arg3
, (unsigned long)regs
.user_arg4
, (unsigned long)regs
.user_arg5
);
336 printf("[OK]\tInitial nr and args are correct\n");
342 /* Advance. We should be stopped at exit. */
343 printf("[RUN]\tSYSCALL\n");
344 if (ptrace(PTRACE_SYSCALL
, chld
, 0, 0) != 0)
345 err(1, "PTRACE_SYSCALL");
348 if (ptrace(PTRACE_GETREGS
, chld
, 0, ®s
) != 0)
349 err(1, "PTRACE_GETREGS");
351 if (regs
.user_syscall_nr
!= SYS_pause
||
352 regs
.user_arg0
!= 0 || regs
.user_arg1
!= 0 ||
353 regs
.user_arg2
!= 0 || regs
.user_arg3
!= 0 ||
354 regs
.user_arg4
!= 0 || regs
.user_arg5
!= 0) {
355 printf("[FAIL]\tArgs after SIGUSR1 are wrong (nr=%lu, args=%lu %lu %lu %lu %lu %lu)\n", (unsigned long)regs
.user_syscall_nr
, (unsigned long)regs
.user_arg0
, (unsigned long)regs
.user_arg1
, (unsigned long)regs
.user_arg2
, (unsigned long)regs
.user_arg3
, (unsigned long)regs
.user_arg4
, (unsigned long)regs
.user_arg5
);
358 printf("[OK]\tArgs after SIGUSR1 are correct (ax = %ld)\n",
362 /* Poke the regs back in. This must not break anything. */
363 if (ptrace(PTRACE_SETREGS
, chld
, 0, ®s
) != 0)
364 err(1, "PTRACE_SETREGS");
366 /* Catch the (ignored) SIGUSR1. */
367 if (ptrace(PTRACE_CONT
, chld
, 0, 0) != 0)
368 err(1, "PTRACE_CONT");
369 if (waitpid(chld
, &status
, 0) != chld
)
371 if (!WIFSTOPPED(status
)) {
372 printf("[FAIL]\tChild was stopped for SIGUSR1 (status = 0x%x)\n", status
);
375 printf("[OK]\tChild got SIGUSR1\n");
378 /* The next event should be pause(2) again. */
379 printf("[RUN]\tStep again\n");
380 if (ptrace(PTRACE_SYSCALL
, chld
, 0, 0) != 0)
381 err(1, "PTRACE_SYSCALL");
384 /* We should be stopped at pause(2) entry. */
386 if (ptrace(PTRACE_GETREGS
, chld
, 0, ®s
) != 0)
387 err(1, "PTRACE_GETREGS");
389 if (regs
.user_syscall_nr
!= SYS_pause
||
390 regs
.user_arg0
!= 0 || regs
.user_arg1
!= 0 ||
391 regs
.user_arg2
!= 0 || regs
.user_arg3
!= 0 ||
392 regs
.user_arg4
!= 0 || regs
.user_arg5
!= 0) {
393 printf("[FAIL]\tpause did not restart (nr=%lu, args=%lu %lu %lu %lu %lu %lu)\n", (unsigned long)regs
.user_syscall_nr
, (unsigned long)regs
.user_arg0
, (unsigned long)regs
.user_arg1
, (unsigned long)regs
.user_arg2
, (unsigned long)regs
.user_arg3
, (unsigned long)regs
.user_arg4
, (unsigned long)regs
.user_arg5
);
396 printf("[OK]\tpause(2) restarted correctly\n");
401 if (waitpid(chld
, &status
, 0) != chld
)
407 printf("[RUN]\tCheck int80 return regs\n");
408 test_sys32_regs(do_full_int80
);
410 #if defined(__i386__) && (!defined(__GLIBC__) || __GLIBC__ > 2 || __GLIBC_MINOR__ >= 16)
411 vsyscall32
= (void *)getauxval(AT_SYSINFO
);
412 printf("[RUN]\tCheck AT_SYSINFO return regs\n");
413 test_sys32_regs(do_full_vsyscall32
);
416 test_ptrace_syscall_restart();
418 test_restart_under_ptrace();