Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* ptrace.c */ |
2 | /* By Ross Biro 1/23/92 */ | |
3 | /* | |
4 | * Pentium III FXSR, SSE support | |
5 | * Gareth Hughes <gareth@valinux.com>, May 2000 | |
6 | * | |
7 | * x86-64 port 2000-2002 Andi Kleen | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/smp.h> | |
1da177e4 LT |
14 | #include <linux/errno.h> |
15 | #include <linux/ptrace.h> | |
16 | #include <linux/user.h> | |
17 | #include <linux/security.h> | |
18 | #include <linux/audit.h> | |
19 | #include <linux/seccomp.h> | |
7ed20e1a | 20 | #include <linux/signal.h> |
1da177e4 LT |
21 | |
22 | #include <asm/uaccess.h> | |
23 | #include <asm/pgtable.h> | |
24 | #include <asm/system.h> | |
25 | #include <asm/processor.h> | |
26 | #include <asm/i387.h> | |
27 | #include <asm/debugreg.h> | |
28 | #include <asm/ldt.h> | |
29 | #include <asm/desc.h> | |
30 | #include <asm/proto.h> | |
31 | #include <asm/ia32.h> | |
32 | ||
33 | /* | |
34 | * does not yet catch signals sent when the child dies. | |
35 | * in exit.c or in signal.c. | |
36 | */ | |
37 | ||
60923df3 CE |
38 | /* |
39 | * Determines which flags the user has access to [1 = access, 0 = no access]. | |
40 | * Prohibits changing ID(21), VIP(20), VIF(19), VM(17), IOPL(12-13), IF(9). | |
41 | * Also masks reserved bits (63-22, 15, 5, 3, 1). | |
42 | */ | |
43 | #define FLAG_MASK 0x54dd5UL | |
1da177e4 LT |
44 | |
45 | /* set's the trap flag. */ | |
46 | #define TRAP_FLAG 0x100UL | |
47 | ||
48 | /* | |
49 | * eflags and offset of eflags on child stack.. | |
50 | */ | |
51 | #define EFLAGS offsetof(struct pt_regs, eflags) | |
52 | #define EFL_OFFSET ((int)(EFLAGS-sizeof(struct pt_regs))) | |
53 | ||
54 | /* | |
55 | * this routine will get a word off of the processes privileged stack. | |
56 | * the offset is how far from the base addr as stored in the TSS. | |
57 | * this routine assumes that all the privileged stacks are in our | |
58 | * data space. | |
59 | */ | |
60 | static inline unsigned long get_stack_long(struct task_struct *task, int offset) | |
61 | { | |
62 | unsigned char *stack; | |
63 | ||
64 | stack = (unsigned char *)task->thread.rsp0; | |
65 | stack += offset; | |
66 | return (*((unsigned long *)stack)); | |
67 | } | |
68 | ||
69 | /* | |
70 | * this routine will put a word on the processes privileged stack. | |
71 | * the offset is how far from the base addr as stored in the TSS. | |
72 | * this routine assumes that all the privileged stacks are in our | |
73 | * data space. | |
74 | */ | |
75 | static inline long put_stack_long(struct task_struct *task, int offset, | |
76 | unsigned long data) | |
77 | { | |
78 | unsigned char * stack; | |
79 | ||
80 | stack = (unsigned char *) task->thread.rsp0; | |
81 | stack += offset; | |
82 | *(unsigned long *) stack = data; | |
83 | return 0; | |
84 | } | |
85 | ||
e502cdd6 AK |
86 | #define LDT_SEGMENT 4 |
87 | ||
88 | unsigned long convert_rip_to_linear(struct task_struct *child, struct pt_regs *regs) | |
89 | { | |
90 | unsigned long addr, seg; | |
91 | ||
92 | addr = regs->rip; | |
93 | seg = regs->cs & 0xffff; | |
94 | ||
95 | /* | |
96 | * We'll assume that the code segments in the GDT | |
97 | * are all zero-based. That is largely true: the | |
98 | * TLS segments are used for data, and the PNPBIOS | |
99 | * and APM bios ones we just ignore here. | |
100 | */ | |
101 | if (seg & LDT_SEGMENT) { | |
102 | u32 *desc; | |
103 | unsigned long base; | |
104 | ||
105 | down(&child->mm->context.sem); | |
106 | desc = child->mm->context.ldt + (seg & ~7); | |
107 | base = (desc[0] >> 16) | ((desc[1] & 0xff) << 16) | (desc[1] & 0xff000000); | |
108 | ||
109 | /* 16-bit code segment? */ | |
110 | if (!((desc[1] >> 22) & 1)) | |
111 | addr &= 0xffff; | |
112 | addr += base; | |
113 | up(&child->mm->context.sem); | |
114 | } | |
115 | return addr; | |
116 | } | |
117 | ||
2ade2920 | 118 | static int is_setting_trap_flag(struct task_struct *child, struct pt_regs *regs) |
e502cdd6 AK |
119 | { |
120 | int i, copied; | |
2ade2920 | 121 | unsigned char opcode[15]; |
e502cdd6 AK |
122 | unsigned long addr = convert_rip_to_linear(child, regs); |
123 | ||
124 | copied = access_process_vm(child, addr, opcode, sizeof(opcode), 0); | |
125 | for (i = 0; i < copied; i++) { | |
126 | switch (opcode[i]) { | |
2ade2920 CE |
127 | /* popf and iret */ |
128 | case 0x9d: case 0xcf: | |
e502cdd6 AK |
129 | return 1; |
130 | ||
131 | /* CHECKME: 64 65 */ | |
132 | ||
133 | /* opcode and address size prefixes */ | |
134 | case 0x66: case 0x67: | |
135 | continue; | |
136 | /* irrelevant prefixes (segment overrides and repeats) */ | |
137 | case 0x26: case 0x2e: | |
138 | case 0x36: case 0x3e: | |
139 | case 0x64: case 0x65: | |
d4d35854 | 140 | case 0xf2: case 0xf3: |
e502cdd6 AK |
141 | continue; |
142 | ||
e502cdd6 | 143 | case 0x40 ... 0x4f: |
a752d719 CE |
144 | if (regs->cs != __USER_CS) |
145 | /* 32-bit mode: register increment */ | |
146 | return 0; | |
147 | /* 64-bit mode: REX prefix */ | |
e502cdd6 AK |
148 | continue; |
149 | ||
d4d35854 | 150 | /* CHECKME: f2, f3 */ |
e502cdd6 AK |
151 | |
152 | /* | |
153 | * pushf: NOTE! We should probably not let | |
154 | * the user see the TF bit being set. But | |
155 | * it's more pain than it's worth to avoid | |
156 | * it, and a debugger could emulate this | |
157 | * all in user space if it _really_ cares. | |
158 | */ | |
159 | case 0x9c: | |
160 | default: | |
161 | return 0; | |
162 | } | |
163 | } | |
164 | return 0; | |
165 | } | |
166 | ||
aa85b9af AK |
167 | static void set_singlestep(struct task_struct *child) |
168 | { | |
bb049232 | 169 | struct pt_regs *regs = task_pt_regs(child); |
aa85b9af AK |
170 | |
171 | /* | |
172 | * Always set TIF_SINGLESTEP - this guarantees that | |
173 | * we single-step system calls etc.. This will also | |
174 | * cause us to set TF when returning to user mode. | |
175 | */ | |
176 | set_tsk_thread_flag(child, TIF_SINGLESTEP); | |
177 | ||
178 | /* | |
179 | * If TF was already set, don't do anything else | |
180 | */ | |
181 | if (regs->eflags & TRAP_FLAG) | |
182 | return; | |
183 | ||
184 | /* Set TF on the kernel stack.. */ | |
185 | regs->eflags |= TRAP_FLAG; | |
186 | ||
e502cdd6 AK |
187 | /* |
188 | * ..but if TF is changed by the instruction we will trace, | |
189 | * don't mark it as being "us" that set it, so that we | |
190 | * won't clear it by hand later. | |
e502cdd6 | 191 | */ |
2ade2920 | 192 | if (is_setting_trap_flag(child, regs)) |
e502cdd6 AK |
193 | return; |
194 | ||
aa85b9af AK |
195 | child->ptrace |= PT_DTRACE; |
196 | } | |
197 | ||
198 | static void clear_singlestep(struct task_struct *child) | |
199 | { | |
200 | /* Always clear TIF_SINGLESTEP... */ | |
201 | clear_tsk_thread_flag(child, TIF_SINGLESTEP); | |
202 | ||
203 | /* But touch TF only if it was set by us.. */ | |
204 | if (child->ptrace & PT_DTRACE) { | |
bb049232 | 205 | struct pt_regs *regs = task_pt_regs(child); |
aa85b9af AK |
206 | regs->eflags &= ~TRAP_FLAG; |
207 | child->ptrace &= ~PT_DTRACE; | |
208 | } | |
209 | } | |
210 | ||
1da177e4 LT |
211 | /* |
212 | * Called by kernel/ptrace.c when detaching.. | |
213 | * | |
214 | * Make sure the single step bit is not set. | |
215 | */ | |
216 | void ptrace_disable(struct task_struct *child) | |
217 | { | |
aa85b9af | 218 | clear_singlestep(child); |
1da177e4 LT |
219 | } |
220 | ||
221 | static int putreg(struct task_struct *child, | |
222 | unsigned long regno, unsigned long value) | |
223 | { | |
224 | unsigned long tmp; | |
225 | ||
226 | /* Some code in the 64bit emulation may not be 64bit clean. | |
227 | Don't take any chances. */ | |
228 | if (test_tsk_thread_flag(child, TIF_IA32)) | |
229 | value &= 0xffffffff; | |
230 | switch (regno) { | |
231 | case offsetof(struct user_regs_struct,fs): | |
232 | if (value && (value & 3) != 3) | |
233 | return -EIO; | |
234 | child->thread.fsindex = value & 0xffff; | |
235 | return 0; | |
236 | case offsetof(struct user_regs_struct,gs): | |
237 | if (value && (value & 3) != 3) | |
238 | return -EIO; | |
239 | child->thread.gsindex = value & 0xffff; | |
240 | return 0; | |
241 | case offsetof(struct user_regs_struct,ds): | |
242 | if (value && (value & 3) != 3) | |
243 | return -EIO; | |
244 | child->thread.ds = value & 0xffff; | |
245 | return 0; | |
246 | case offsetof(struct user_regs_struct,es): | |
247 | if (value && (value & 3) != 3) | |
248 | return -EIO; | |
249 | child->thread.es = value & 0xffff; | |
250 | return 0; | |
251 | case offsetof(struct user_regs_struct,ss): | |
252 | if ((value & 3) != 3) | |
253 | return -EIO; | |
254 | value &= 0xffff; | |
255 | return 0; | |
256 | case offsetof(struct user_regs_struct,fs_base): | |
84929801 | 257 | if (value >= TASK_SIZE_OF(child)) |
f6b8d477 | 258 | return -EIO; |
1da177e4 LT |
259 | child->thread.fs = value; |
260 | return 0; | |
261 | case offsetof(struct user_regs_struct,gs_base): | |
84929801 | 262 | if (value >= TASK_SIZE_OF(child)) |
f6b8d477 | 263 | return -EIO; |
1da177e4 LT |
264 | child->thread.gs = value; |
265 | return 0; | |
266 | case offsetof(struct user_regs_struct, eflags): | |
267 | value &= FLAG_MASK; | |
268 | tmp = get_stack_long(child, EFL_OFFSET); | |
269 | tmp &= ~FLAG_MASK; | |
270 | value |= tmp; | |
271 | break; | |
272 | case offsetof(struct user_regs_struct,cs): | |
273 | if ((value & 3) != 3) | |
274 | return -EIO; | |
275 | value &= 0xffff; | |
276 | break; | |
277 | } | |
278 | put_stack_long(child, regno - sizeof(struct pt_regs), value); | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static unsigned long getreg(struct task_struct *child, unsigned long regno) | |
283 | { | |
284 | unsigned long val; | |
285 | switch (regno) { | |
286 | case offsetof(struct user_regs_struct, fs): | |
287 | return child->thread.fsindex; | |
288 | case offsetof(struct user_regs_struct, gs): | |
289 | return child->thread.gsindex; | |
290 | case offsetof(struct user_regs_struct, ds): | |
291 | return child->thread.ds; | |
292 | case offsetof(struct user_regs_struct, es): | |
293 | return child->thread.es; | |
294 | case offsetof(struct user_regs_struct, fs_base): | |
295 | return child->thread.fs; | |
296 | case offsetof(struct user_regs_struct, gs_base): | |
297 | return child->thread.gs; | |
298 | default: | |
299 | regno = regno - sizeof(struct pt_regs); | |
300 | val = get_stack_long(child, regno); | |
301 | if (test_tsk_thread_flag(child, TIF_IA32)) | |
302 | val &= 0xffffffff; | |
303 | return val; | |
304 | } | |
305 | ||
306 | } | |
307 | ||
481bed45 | 308 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 309 | { |
1da177e4 LT |
310 | long i, ret; |
311 | unsigned ui; | |
312 | ||
1da177e4 LT |
313 | switch (request) { |
314 | /* when I and D space are separate, these will need to be fixed. */ | |
315 | case PTRACE_PEEKTEXT: /* read word at location addr. */ | |
76647323 AD |
316 | case PTRACE_PEEKDATA: |
317 | ret = generic_ptrace_peekdata(child, addr, data); | |
1da177e4 | 318 | break; |
1da177e4 LT |
319 | |
320 | /* read the word at location addr in the USER area. */ | |
321 | case PTRACE_PEEKUSR: { | |
322 | unsigned long tmp; | |
323 | ||
324 | ret = -EIO; | |
325 | if ((addr & 7) || | |
326 | addr > sizeof(struct user) - 7) | |
327 | break; | |
328 | ||
329 | switch (addr) { | |
c4d1fcf3 | 330 | case 0 ... sizeof(struct user_regs_struct) - sizeof(long): |
1da177e4 LT |
331 | tmp = getreg(child, addr); |
332 | break; | |
333 | case offsetof(struct user, u_debugreg[0]): | |
334 | tmp = child->thread.debugreg0; | |
335 | break; | |
336 | case offsetof(struct user, u_debugreg[1]): | |
337 | tmp = child->thread.debugreg1; | |
338 | break; | |
339 | case offsetof(struct user, u_debugreg[2]): | |
340 | tmp = child->thread.debugreg2; | |
341 | break; | |
342 | case offsetof(struct user, u_debugreg[3]): | |
343 | tmp = child->thread.debugreg3; | |
344 | break; | |
345 | case offsetof(struct user, u_debugreg[6]): | |
346 | tmp = child->thread.debugreg6; | |
347 | break; | |
348 | case offsetof(struct user, u_debugreg[7]): | |
349 | tmp = child->thread.debugreg7; | |
350 | break; | |
351 | default: | |
352 | tmp = 0; | |
353 | break; | |
354 | } | |
355 | ret = put_user(tmp,(unsigned long __user *) data); | |
356 | break; | |
357 | } | |
358 | ||
359 | /* when I and D space are separate, this will have to be fixed. */ | |
360 | case PTRACE_POKETEXT: /* write the word at location addr. */ | |
361 | case PTRACE_POKEDATA: | |
f284ce72 | 362 | ret = generic_ptrace_pokedata(child, addr, data); |
1da177e4 LT |
363 | break; |
364 | ||
365 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ | |
84929801 SS |
366 | { |
367 | int dsize = test_tsk_thread_flag(child, TIF_IA32) ? 3 : 7; | |
1da177e4 LT |
368 | ret = -EIO; |
369 | if ((addr & 7) || | |
370 | addr > sizeof(struct user) - 7) | |
371 | break; | |
372 | ||
373 | switch (addr) { | |
c4d1fcf3 | 374 | case 0 ... sizeof(struct user_regs_struct) - sizeof(long): |
1da177e4 LT |
375 | ret = putreg(child, addr, data); |
376 | break; | |
377 | /* Disallows to set a breakpoint into the vsyscall */ | |
378 | case offsetof(struct user, u_debugreg[0]): | |
84929801 | 379 | if (data >= TASK_SIZE_OF(child) - dsize) break; |
1da177e4 LT |
380 | child->thread.debugreg0 = data; |
381 | ret = 0; | |
382 | break; | |
383 | case offsetof(struct user, u_debugreg[1]): | |
84929801 | 384 | if (data >= TASK_SIZE_OF(child) - dsize) break; |
1da177e4 LT |
385 | child->thread.debugreg1 = data; |
386 | ret = 0; | |
387 | break; | |
388 | case offsetof(struct user, u_debugreg[2]): | |
84929801 | 389 | if (data >= TASK_SIZE_OF(child) - dsize) break; |
1da177e4 LT |
390 | child->thread.debugreg2 = data; |
391 | ret = 0; | |
392 | break; | |
393 | case offsetof(struct user, u_debugreg[3]): | |
84929801 | 394 | if (data >= TASK_SIZE_OF(child) - dsize) break; |
1da177e4 LT |
395 | child->thread.debugreg3 = data; |
396 | ret = 0; | |
397 | break; | |
398 | case offsetof(struct user, u_debugreg[6]): | |
399 | if (data >> 32) | |
400 | break; | |
401 | child->thread.debugreg6 = data; | |
402 | ret = 0; | |
403 | break; | |
404 | case offsetof(struct user, u_debugreg[7]): | |
405 | /* See arch/i386/kernel/ptrace.c for an explanation of | |
406 | * this awkward check.*/ | |
893efca9 JB |
407 | data &= ~DR_CONTROL_RESERVED; |
408 | for(i=0; i<4; i++) | |
409 | if ((0x5554 >> ((data >> (16 + 4*i)) & 0xf)) & 1) | |
1da177e4 LT |
410 | break; |
411 | if (i == 4) { | |
d3a4f48d SE |
412 | child->thread.debugreg7 = data; |
413 | if (data) | |
414 | set_tsk_thread_flag(child, TIF_DEBUG); | |
415 | else | |
416 | clear_tsk_thread_flag(child, TIF_DEBUG); | |
1da177e4 | 417 | ret = 0; |
d3a4f48d | 418 | } |
1da177e4 LT |
419 | break; |
420 | } | |
421 | break; | |
84929801 | 422 | } |
1da177e4 | 423 | case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ |
aa85b9af | 424 | case PTRACE_CONT: /* restart after signal. */ |
1da177e4 LT |
425 | |
426 | ret = -EIO; | |
7ed20e1a | 427 | if (!valid_signal(data)) |
1da177e4 LT |
428 | break; |
429 | if (request == PTRACE_SYSCALL) | |
430 | set_tsk_thread_flag(child,TIF_SYSCALL_TRACE); | |
431 | else | |
432 | clear_tsk_thread_flag(child,TIF_SYSCALL_TRACE); | |
433 | clear_tsk_thread_flag(child, TIF_SINGLESTEP); | |
434 | child->exit_code = data; | |
aa85b9af AK |
435 | /* make sure the single step bit is not set. */ |
436 | clear_singlestep(child); | |
1da177e4 LT |
437 | wake_up_process(child); |
438 | ret = 0; | |
439 | break; | |
1da177e4 LT |
440 | |
441 | #ifdef CONFIG_IA32_EMULATION | |
442 | /* This makes only sense with 32bit programs. Allow a | |
443 | 64bit debugger to fully examine them too. Better | |
444 | don't use it against 64bit processes, use | |
445 | PTRACE_ARCH_PRCTL instead. */ | |
446 | case PTRACE_SET_THREAD_AREA: { | |
447 | struct user_desc __user *p; | |
448 | int old; | |
449 | p = (struct user_desc __user *)data; | |
450 | get_user(old, &p->entry_number); | |
451 | put_user(addr, &p->entry_number); | |
452 | ret = do_set_thread_area(&child->thread, p); | |
453 | put_user(old, &p->entry_number); | |
454 | break; | |
455 | case PTRACE_GET_THREAD_AREA: | |
456 | p = (struct user_desc __user *)data; | |
457 | get_user(old, &p->entry_number); | |
458 | put_user(addr, &p->entry_number); | |
459 | ret = do_get_thread_area(&child->thread, p); | |
460 | put_user(old, &p->entry_number); | |
461 | break; | |
462 | } | |
463 | #endif | |
464 | /* normal 64bit interface to access TLS data. | |
465 | Works just like arch_prctl, except that the arguments | |
466 | are reversed. */ | |
467 | case PTRACE_ARCH_PRCTL: | |
468 | ret = do_arch_prctl(child, data, addr); | |
469 | break; | |
470 | ||
471 | /* | |
472 | * make the child exit. Best I can do is send it a sigkill. | |
473 | * perhaps it should be put in the status that it wants to | |
474 | * exit. | |
475 | */ | |
aa85b9af | 476 | case PTRACE_KILL: |
1da177e4 LT |
477 | ret = 0; |
478 | if (child->exit_state == EXIT_ZOMBIE) /* already dead */ | |
479 | break; | |
480 | clear_tsk_thread_flag(child, TIF_SINGLESTEP); | |
481 | child->exit_code = SIGKILL; | |
482 | /* make sure the single step bit is not set. */ | |
aa85b9af | 483 | clear_singlestep(child); |
1da177e4 LT |
484 | wake_up_process(child); |
485 | break; | |
1da177e4 | 486 | |
aa85b9af | 487 | case PTRACE_SINGLESTEP: /* set the trap flag. */ |
1da177e4 | 488 | ret = -EIO; |
7ed20e1a | 489 | if (!valid_signal(data)) |
1da177e4 LT |
490 | break; |
491 | clear_tsk_thread_flag(child,TIF_SYSCALL_TRACE); | |
aa85b9af | 492 | set_singlestep(child); |
1da177e4 LT |
493 | child->exit_code = data; |
494 | /* give it a chance to run. */ | |
495 | wake_up_process(child); | |
496 | ret = 0; | |
497 | break; | |
1da177e4 LT |
498 | |
499 | case PTRACE_DETACH: | |
500 | /* detach a process that was attached. */ | |
501 | ret = ptrace_detach(child, data); | |
502 | break; | |
503 | ||
504 | case PTRACE_GETREGS: { /* Get all gp regs from the child. */ | |
505 | if (!access_ok(VERIFY_WRITE, (unsigned __user *)data, | |
506 | sizeof(struct user_regs_struct))) { | |
507 | ret = -EIO; | |
508 | break; | |
509 | } | |
510 | ret = 0; | |
511 | for (ui = 0; ui < sizeof(struct user_regs_struct); ui += sizeof(long)) { | |
512 | ret |= __put_user(getreg(child, ui),(unsigned long __user *) data); | |
513 | data += sizeof(long); | |
514 | } | |
515 | break; | |
516 | } | |
517 | ||
518 | case PTRACE_SETREGS: { /* Set all gp regs in the child. */ | |
519 | unsigned long tmp; | |
520 | if (!access_ok(VERIFY_READ, (unsigned __user *)data, | |
521 | sizeof(struct user_regs_struct))) { | |
522 | ret = -EIO; | |
523 | break; | |
524 | } | |
525 | ret = 0; | |
526 | for (ui = 0; ui < sizeof(struct user_regs_struct); ui += sizeof(long)) { | |
f49481bc AK |
527 | ret = __get_user(tmp, (unsigned long __user *) data); |
528 | if (ret) | |
529 | break; | |
530 | ret = putreg(child, ui, tmp); | |
531 | if (ret) | |
532 | break; | |
1da177e4 LT |
533 | data += sizeof(long); |
534 | } | |
535 | break; | |
536 | } | |
537 | ||
538 | case PTRACE_GETFPREGS: { /* Get the child extended FPU state. */ | |
539 | if (!access_ok(VERIFY_WRITE, (unsigned __user *)data, | |
540 | sizeof(struct user_i387_struct))) { | |
541 | ret = -EIO; | |
542 | break; | |
543 | } | |
544 | ret = get_fpregs((struct user_i387_struct __user *)data, child); | |
545 | break; | |
546 | } | |
547 | ||
548 | case PTRACE_SETFPREGS: { /* Set the child extended FPU state. */ | |
549 | if (!access_ok(VERIFY_READ, (unsigned __user *)data, | |
550 | sizeof(struct user_i387_struct))) { | |
551 | ret = -EIO; | |
552 | break; | |
553 | } | |
554 | set_stopped_child_used_math(child); | |
555 | ret = set_fpregs(child, (struct user_i387_struct __user *)data); | |
556 | break; | |
557 | } | |
558 | ||
559 | default: | |
560 | ret = ptrace_request(child, request, addr, data); | |
561 | break; | |
562 | } | |
1da177e4 LT |
563 | return ret; |
564 | } | |
565 | ||
566 | static void syscall_trace(struct pt_regs *regs) | |
567 | { | |
568 | ||
569 | #if 0 | |
570 | printk("trace %s rip %lx rsp %lx rax %d origrax %d caller %lx tiflags %x ptrace %x\n", | |
571 | current->comm, | |
572 | regs->rip, regs->rsp, regs->rax, regs->orig_rax, __builtin_return_address(0), | |
573 | current_thread_info()->flags, current->ptrace); | |
574 | #endif | |
575 | ||
576 | ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) | |
577 | ? 0x80 : 0)); | |
578 | /* | |
579 | * this isn't the same as continuing with a signal, but it will do | |
580 | * for normal use. strace only continues with a signal if the | |
581 | * stopping signal is not SIGTRAP. -brl | |
582 | */ | |
583 | if (current->exit_code) { | |
584 | send_sig(current->exit_code, current, 1); | |
585 | current->exit_code = 0; | |
586 | } | |
587 | } | |
588 | ||
589 | asmlinkage void syscall_trace_enter(struct pt_regs *regs) | |
590 | { | |
591 | /* do the secure computing check first */ | |
592 | secure_computing(regs->orig_rax); | |
593 | ||
2fd6f58b | 594 | if (test_thread_flag(TIF_SYSCALL_TRACE) |
595 | && (current->ptrace & PT_PTRACED)) | |
596 | syscall_trace(regs); | |
597 | ||
488f2eac DW |
598 | if (unlikely(current->audit_context)) { |
599 | if (test_thread_flag(TIF_IA32)) { | |
5411be59 | 600 | audit_syscall_entry(AUDIT_ARCH_I386, |
488f2eac DW |
601 | regs->orig_rax, |
602 | regs->rbx, regs->rcx, | |
603 | regs->rdx, regs->rsi); | |
604 | } else { | |
5411be59 | 605 | audit_syscall_entry(AUDIT_ARCH_X86_64, |
488f2eac DW |
606 | regs->orig_rax, |
607 | regs->rdi, regs->rsi, | |
608 | regs->rdx, regs->r10); | |
609 | } | |
610 | } | |
1da177e4 LT |
611 | } |
612 | ||
613 | asmlinkage void syscall_trace_leave(struct pt_regs *regs) | |
614 | { | |
615 | if (unlikely(current->audit_context)) | |
5411be59 | 616 | audit_syscall_exit(AUDITSC_RESULT(regs->rax), regs->rax); |
1da177e4 LT |
617 | |
618 | if ((test_thread_flag(TIF_SYSCALL_TRACE) | |
619 | || test_thread_flag(TIF_SINGLESTEP)) | |
620 | && (current->ptrace & PT_PTRACED)) | |
621 | syscall_trace(regs); | |
622 | } |