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> | |
14 | #include <linux/smp_lock.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/ptrace.h> | |
17 | #include <linux/user.h> | |
18 | #include <linux/security.h> | |
19 | #include <linux/audit.h> | |
20 | #include <linux/seccomp.h> | |
7ed20e1a | 21 | #include <linux/signal.h> |
1da177e4 LT |
22 | |
23 | #include <asm/uaccess.h> | |
24 | #include <asm/pgtable.h> | |
25 | #include <asm/system.h> | |
26 | #include <asm/processor.h> | |
27 | #include <asm/i387.h> | |
28 | #include <asm/debugreg.h> | |
29 | #include <asm/ldt.h> | |
30 | #include <asm/desc.h> | |
31 | #include <asm/proto.h> | |
32 | #include <asm/ia32.h> | |
33 | ||
34 | /* | |
35 | * does not yet catch signals sent when the child dies. | |
36 | * in exit.c or in signal.c. | |
37 | */ | |
38 | ||
60923df3 CE |
39 | /* |
40 | * Determines which flags the user has access to [1 = access, 0 = no access]. | |
41 | * Prohibits changing ID(21), VIP(20), VIF(19), VM(17), IOPL(12-13), IF(9). | |
42 | * Also masks reserved bits (63-22, 15, 5, 3, 1). | |
43 | */ | |
44 | #define FLAG_MASK 0x54dd5UL | |
1da177e4 LT |
45 | |
46 | /* set's the trap flag. */ | |
47 | #define TRAP_FLAG 0x100UL | |
48 | ||
49 | /* | |
50 | * eflags and offset of eflags on child stack.. | |
51 | */ | |
52 | #define EFLAGS offsetof(struct pt_regs, eflags) | |
53 | #define EFL_OFFSET ((int)(EFLAGS-sizeof(struct pt_regs))) | |
54 | ||
55 | /* | |
56 | * this routine will get a word off of the processes privileged stack. | |
57 | * the offset is how far from the base addr as stored in the TSS. | |
58 | * this routine assumes that all the privileged stacks are in our | |
59 | * data space. | |
60 | */ | |
61 | static inline unsigned long get_stack_long(struct task_struct *task, int offset) | |
62 | { | |
63 | unsigned char *stack; | |
64 | ||
65 | stack = (unsigned char *)task->thread.rsp0; | |
66 | stack += offset; | |
67 | return (*((unsigned long *)stack)); | |
68 | } | |
69 | ||
70 | /* | |
71 | * this routine will put a word on the processes privileged stack. | |
72 | * the offset is how far from the base addr as stored in the TSS. | |
73 | * this routine assumes that all the privileged stacks are in our | |
74 | * data space. | |
75 | */ | |
76 | static inline long put_stack_long(struct task_struct *task, int offset, | |
77 | unsigned long data) | |
78 | { | |
79 | unsigned char * stack; | |
80 | ||
81 | stack = (unsigned char *) task->thread.rsp0; | |
82 | stack += offset; | |
83 | *(unsigned long *) stack = data; | |
84 | return 0; | |
85 | } | |
86 | ||
e502cdd6 AK |
87 | #define LDT_SEGMENT 4 |
88 | ||
89 | unsigned long convert_rip_to_linear(struct task_struct *child, struct pt_regs *regs) | |
90 | { | |
91 | unsigned long addr, seg; | |
92 | ||
93 | addr = regs->rip; | |
94 | seg = regs->cs & 0xffff; | |
95 | ||
96 | /* | |
97 | * We'll assume that the code segments in the GDT | |
98 | * are all zero-based. That is largely true: the | |
99 | * TLS segments are used for data, and the PNPBIOS | |
100 | * and APM bios ones we just ignore here. | |
101 | */ | |
102 | if (seg & LDT_SEGMENT) { | |
103 | u32 *desc; | |
104 | unsigned long base; | |
105 | ||
106 | down(&child->mm->context.sem); | |
107 | desc = child->mm->context.ldt + (seg & ~7); | |
108 | base = (desc[0] >> 16) | ((desc[1] & 0xff) << 16) | (desc[1] & 0xff000000); | |
109 | ||
110 | /* 16-bit code segment? */ | |
111 | if (!((desc[1] >> 22) & 1)) | |
112 | addr &= 0xffff; | |
113 | addr += base; | |
114 | up(&child->mm->context.sem); | |
115 | } | |
116 | return addr; | |
117 | } | |
118 | ||
2ade2920 | 119 | static int is_setting_trap_flag(struct task_struct *child, struct pt_regs *regs) |
e502cdd6 AK |
120 | { |
121 | int i, copied; | |
2ade2920 | 122 | unsigned char opcode[15]; |
e502cdd6 AK |
123 | unsigned long addr = convert_rip_to_linear(child, regs); |
124 | ||
125 | copied = access_process_vm(child, addr, opcode, sizeof(opcode), 0); | |
126 | for (i = 0; i < copied; i++) { | |
127 | switch (opcode[i]) { | |
2ade2920 CE |
128 | /* popf and iret */ |
129 | case 0x9d: case 0xcf: | |
e502cdd6 AK |
130 | return 1; |
131 | ||
132 | /* CHECKME: 64 65 */ | |
133 | ||
134 | /* opcode and address size prefixes */ | |
135 | case 0x66: case 0x67: | |
136 | continue; | |
137 | /* irrelevant prefixes (segment overrides and repeats) */ | |
138 | case 0x26: case 0x2e: | |
139 | case 0x36: case 0x3e: | |
140 | case 0x64: case 0x65: | |
d4d35854 | 141 | case 0xf2: case 0xf3: |
e502cdd6 AK |
142 | continue; |
143 | ||
e502cdd6 | 144 | case 0x40 ... 0x4f: |
a752d719 CE |
145 | if (regs->cs != __USER_CS) |
146 | /* 32-bit mode: register increment */ | |
147 | return 0; | |
148 | /* 64-bit mode: REX prefix */ | |
e502cdd6 AK |
149 | continue; |
150 | ||
d4d35854 | 151 | /* CHECKME: f2, f3 */ |
e502cdd6 AK |
152 | |
153 | /* | |
154 | * pushf: NOTE! We should probably not let | |
155 | * the user see the TF bit being set. But | |
156 | * it's more pain than it's worth to avoid | |
157 | * it, and a debugger could emulate this | |
158 | * all in user space if it _really_ cares. | |
159 | */ | |
160 | case 0x9c: | |
161 | default: | |
162 | return 0; | |
163 | } | |
164 | } | |
165 | return 0; | |
166 | } | |
167 | ||
aa85b9af AK |
168 | static void set_singlestep(struct task_struct *child) |
169 | { | |
bb049232 | 170 | struct pt_regs *regs = task_pt_regs(child); |
aa85b9af AK |
171 | |
172 | /* | |
173 | * Always set TIF_SINGLESTEP - this guarantees that | |
174 | * we single-step system calls etc.. This will also | |
175 | * cause us to set TF when returning to user mode. | |
176 | */ | |
177 | set_tsk_thread_flag(child, TIF_SINGLESTEP); | |
178 | ||
179 | /* | |
180 | * If TF was already set, don't do anything else | |
181 | */ | |
182 | if (regs->eflags & TRAP_FLAG) | |
183 | return; | |
184 | ||
185 | /* Set TF on the kernel stack.. */ | |
186 | regs->eflags |= TRAP_FLAG; | |
187 | ||
e502cdd6 AK |
188 | /* |
189 | * ..but if TF is changed by the instruction we will trace, | |
190 | * don't mark it as being "us" that set it, so that we | |
191 | * won't clear it by hand later. | |
e502cdd6 | 192 | */ |
2ade2920 | 193 | if (is_setting_trap_flag(child, regs)) |
e502cdd6 AK |
194 | return; |
195 | ||
aa85b9af AK |
196 | child->ptrace |= PT_DTRACE; |
197 | } | |
198 | ||
199 | static void clear_singlestep(struct task_struct *child) | |
200 | { | |
201 | /* Always clear TIF_SINGLESTEP... */ | |
202 | clear_tsk_thread_flag(child, TIF_SINGLESTEP); | |
203 | ||
204 | /* But touch TF only if it was set by us.. */ | |
205 | if (child->ptrace & PT_DTRACE) { | |
bb049232 | 206 | struct pt_regs *regs = task_pt_regs(child); |
aa85b9af AK |
207 | regs->eflags &= ~TRAP_FLAG; |
208 | child->ptrace &= ~PT_DTRACE; | |
209 | } | |
210 | } | |
211 | ||
1da177e4 LT |
212 | /* |
213 | * Called by kernel/ptrace.c when detaching.. | |
214 | * | |
215 | * Make sure the single step bit is not set. | |
216 | */ | |
217 | void ptrace_disable(struct task_struct *child) | |
218 | { | |
aa85b9af | 219 | clear_singlestep(child); |
1da177e4 LT |
220 | } |
221 | ||
222 | static int putreg(struct task_struct *child, | |
223 | unsigned long regno, unsigned long value) | |
224 | { | |
225 | unsigned long tmp; | |
226 | ||
227 | /* Some code in the 64bit emulation may not be 64bit clean. | |
228 | Don't take any chances. */ | |
229 | if (test_tsk_thread_flag(child, TIF_IA32)) | |
230 | value &= 0xffffffff; | |
231 | switch (regno) { | |
232 | case offsetof(struct user_regs_struct,fs): | |
233 | if (value && (value & 3) != 3) | |
234 | return -EIO; | |
235 | child->thread.fsindex = value & 0xffff; | |
236 | return 0; | |
237 | case offsetof(struct user_regs_struct,gs): | |
238 | if (value && (value & 3) != 3) | |
239 | return -EIO; | |
240 | child->thread.gsindex = value & 0xffff; | |
241 | return 0; | |
242 | case offsetof(struct user_regs_struct,ds): | |
243 | if (value && (value & 3) != 3) | |
244 | return -EIO; | |
245 | child->thread.ds = value & 0xffff; | |
246 | return 0; | |
247 | case offsetof(struct user_regs_struct,es): | |
248 | if (value && (value & 3) != 3) | |
249 | return -EIO; | |
250 | child->thread.es = value & 0xffff; | |
251 | return 0; | |
252 | case offsetof(struct user_regs_struct,ss): | |
253 | if ((value & 3) != 3) | |
254 | return -EIO; | |
255 | value &= 0xffff; | |
256 | return 0; | |
257 | case offsetof(struct user_regs_struct,fs_base): | |
84929801 | 258 | if (value >= TASK_SIZE_OF(child)) |
f6b8d477 | 259 | return -EIO; |
1da177e4 LT |
260 | child->thread.fs = value; |
261 | return 0; | |
262 | case offsetof(struct user_regs_struct,gs_base): | |
84929801 | 263 | if (value >= TASK_SIZE_OF(child)) |
f6b8d477 | 264 | return -EIO; |
1da177e4 LT |
265 | child->thread.gs = value; |
266 | return 0; | |
267 | case offsetof(struct user_regs_struct, eflags): | |
268 | value &= FLAG_MASK; | |
269 | tmp = get_stack_long(child, EFL_OFFSET); | |
270 | tmp &= ~FLAG_MASK; | |
271 | value |= tmp; | |
272 | break; | |
273 | case offsetof(struct user_regs_struct,cs): | |
274 | if ((value & 3) != 3) | |
275 | return -EIO; | |
276 | value &= 0xffff; | |
277 | break; | |
278 | } | |
279 | put_stack_long(child, regno - sizeof(struct pt_regs), value); | |
280 | return 0; | |
281 | } | |
282 | ||
283 | static unsigned long getreg(struct task_struct *child, unsigned long regno) | |
284 | { | |
285 | unsigned long val; | |
286 | switch (regno) { | |
287 | case offsetof(struct user_regs_struct, fs): | |
288 | return child->thread.fsindex; | |
289 | case offsetof(struct user_regs_struct, gs): | |
290 | return child->thread.gsindex; | |
291 | case offsetof(struct user_regs_struct, ds): | |
292 | return child->thread.ds; | |
293 | case offsetof(struct user_regs_struct, es): | |
294 | return child->thread.es; | |
295 | case offsetof(struct user_regs_struct, fs_base): | |
296 | return child->thread.fs; | |
297 | case offsetof(struct user_regs_struct, gs_base): | |
298 | return child->thread.gs; | |
299 | default: | |
300 | regno = regno - sizeof(struct pt_regs); | |
301 | val = get_stack_long(child, regno); | |
302 | if (test_tsk_thread_flag(child, TIF_IA32)) | |
303 | val &= 0xffffffff; | |
304 | return val; | |
305 | } | |
306 | ||
307 | } | |
308 | ||
481bed45 | 309 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 310 | { |
1da177e4 LT |
311 | long i, ret; |
312 | unsigned ui; | |
313 | ||
1da177e4 LT |
314 | switch (request) { |
315 | /* when I and D space are separate, these will need to be fixed. */ | |
316 | case PTRACE_PEEKTEXT: /* read word at location addr. */ | |
317 | case PTRACE_PEEKDATA: { | |
318 | unsigned long tmp; | |
319 | int copied; | |
320 | ||
321 | copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); | |
322 | ret = -EIO; | |
323 | if (copied != sizeof(tmp)) | |
324 | break; | |
325 | ret = put_user(tmp,(unsigned long __user *) data); | |
326 | break; | |
327 | } | |
328 | ||
329 | /* read the word at location addr in the USER area. */ | |
330 | case PTRACE_PEEKUSR: { | |
331 | unsigned long tmp; | |
332 | ||
333 | ret = -EIO; | |
334 | if ((addr & 7) || | |
335 | addr > sizeof(struct user) - 7) | |
336 | break; | |
337 | ||
338 | switch (addr) { | |
c4d1fcf3 | 339 | case 0 ... sizeof(struct user_regs_struct) - sizeof(long): |
1da177e4 LT |
340 | tmp = getreg(child, addr); |
341 | break; | |
342 | case offsetof(struct user, u_debugreg[0]): | |
343 | tmp = child->thread.debugreg0; | |
344 | break; | |
345 | case offsetof(struct user, u_debugreg[1]): | |
346 | tmp = child->thread.debugreg1; | |
347 | break; | |
348 | case offsetof(struct user, u_debugreg[2]): | |
349 | tmp = child->thread.debugreg2; | |
350 | break; | |
351 | case offsetof(struct user, u_debugreg[3]): | |
352 | tmp = child->thread.debugreg3; | |
353 | break; | |
354 | case offsetof(struct user, u_debugreg[6]): | |
355 | tmp = child->thread.debugreg6; | |
356 | break; | |
357 | case offsetof(struct user, u_debugreg[7]): | |
358 | tmp = child->thread.debugreg7; | |
359 | break; | |
360 | default: | |
361 | tmp = 0; | |
362 | break; | |
363 | } | |
364 | ret = put_user(tmp,(unsigned long __user *) data); | |
365 | break; | |
366 | } | |
367 | ||
368 | /* when I and D space are separate, this will have to be fixed. */ | |
369 | case PTRACE_POKETEXT: /* write the word at location addr. */ | |
370 | case PTRACE_POKEDATA: | |
371 | ret = 0; | |
372 | if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data)) | |
373 | break; | |
374 | ret = -EIO; | |
375 | break; | |
376 | ||
377 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ | |
84929801 SS |
378 | { |
379 | int dsize = test_tsk_thread_flag(child, TIF_IA32) ? 3 : 7; | |
1da177e4 LT |
380 | ret = -EIO; |
381 | if ((addr & 7) || | |
382 | addr > sizeof(struct user) - 7) | |
383 | break; | |
384 | ||
385 | switch (addr) { | |
c4d1fcf3 | 386 | case 0 ... sizeof(struct user_regs_struct) - sizeof(long): |
1da177e4 LT |
387 | ret = putreg(child, addr, data); |
388 | break; | |
389 | /* Disallows to set a breakpoint into the vsyscall */ | |
390 | case offsetof(struct user, u_debugreg[0]): | |
84929801 | 391 | if (data >= TASK_SIZE_OF(child) - dsize) break; |
1da177e4 LT |
392 | child->thread.debugreg0 = data; |
393 | ret = 0; | |
394 | break; | |
395 | case offsetof(struct user, u_debugreg[1]): | |
84929801 | 396 | if (data >= TASK_SIZE_OF(child) - dsize) break; |
1da177e4 LT |
397 | child->thread.debugreg1 = data; |
398 | ret = 0; | |
399 | break; | |
400 | case offsetof(struct user, u_debugreg[2]): | |
84929801 | 401 | if (data >= TASK_SIZE_OF(child) - dsize) break; |
1da177e4 LT |
402 | child->thread.debugreg2 = data; |
403 | ret = 0; | |
404 | break; | |
405 | case offsetof(struct user, u_debugreg[3]): | |
84929801 | 406 | if (data >= TASK_SIZE_OF(child) - dsize) break; |
1da177e4 LT |
407 | child->thread.debugreg3 = data; |
408 | ret = 0; | |
409 | break; | |
410 | case offsetof(struct user, u_debugreg[6]): | |
411 | if (data >> 32) | |
412 | break; | |
413 | child->thread.debugreg6 = data; | |
414 | ret = 0; | |
415 | break; | |
416 | case offsetof(struct user, u_debugreg[7]): | |
417 | /* See arch/i386/kernel/ptrace.c for an explanation of | |
418 | * this awkward check.*/ | |
893efca9 JB |
419 | data &= ~DR_CONTROL_RESERVED; |
420 | for(i=0; i<4; i++) | |
421 | if ((0x5554 >> ((data >> (16 + 4*i)) & 0xf)) & 1) | |
1da177e4 LT |
422 | break; |
423 | if (i == 4) { | |
d3a4f48d SE |
424 | child->thread.debugreg7 = data; |
425 | if (data) | |
426 | set_tsk_thread_flag(child, TIF_DEBUG); | |
427 | else | |
428 | clear_tsk_thread_flag(child, TIF_DEBUG); | |
1da177e4 | 429 | ret = 0; |
d3a4f48d | 430 | } |
1da177e4 LT |
431 | break; |
432 | } | |
433 | break; | |
84929801 | 434 | } |
1da177e4 | 435 | case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ |
aa85b9af | 436 | case PTRACE_CONT: /* restart after signal. */ |
1da177e4 LT |
437 | |
438 | ret = -EIO; | |
7ed20e1a | 439 | if (!valid_signal(data)) |
1da177e4 LT |
440 | break; |
441 | if (request == PTRACE_SYSCALL) | |
442 | set_tsk_thread_flag(child,TIF_SYSCALL_TRACE); | |
443 | else | |
444 | clear_tsk_thread_flag(child,TIF_SYSCALL_TRACE); | |
445 | clear_tsk_thread_flag(child, TIF_SINGLESTEP); | |
446 | child->exit_code = data; | |
aa85b9af AK |
447 | /* make sure the single step bit is not set. */ |
448 | clear_singlestep(child); | |
1da177e4 LT |
449 | wake_up_process(child); |
450 | ret = 0; | |
451 | break; | |
1da177e4 LT |
452 | |
453 | #ifdef CONFIG_IA32_EMULATION | |
454 | /* This makes only sense with 32bit programs. Allow a | |
455 | 64bit debugger to fully examine them too. Better | |
456 | don't use it against 64bit processes, use | |
457 | PTRACE_ARCH_PRCTL instead. */ | |
458 | case PTRACE_SET_THREAD_AREA: { | |
459 | struct user_desc __user *p; | |
460 | int old; | |
461 | p = (struct user_desc __user *)data; | |
462 | get_user(old, &p->entry_number); | |
463 | put_user(addr, &p->entry_number); | |
464 | ret = do_set_thread_area(&child->thread, p); | |
465 | put_user(old, &p->entry_number); | |
466 | break; | |
467 | case PTRACE_GET_THREAD_AREA: | |
468 | p = (struct user_desc __user *)data; | |
469 | get_user(old, &p->entry_number); | |
470 | put_user(addr, &p->entry_number); | |
471 | ret = do_get_thread_area(&child->thread, p); | |
472 | put_user(old, &p->entry_number); | |
473 | break; | |
474 | } | |
475 | #endif | |
476 | /* normal 64bit interface to access TLS data. | |
477 | Works just like arch_prctl, except that the arguments | |
478 | are reversed. */ | |
479 | case PTRACE_ARCH_PRCTL: | |
480 | ret = do_arch_prctl(child, data, addr); | |
481 | break; | |
482 | ||
483 | /* | |
484 | * make the child exit. Best I can do is send it a sigkill. | |
485 | * perhaps it should be put in the status that it wants to | |
486 | * exit. | |
487 | */ | |
aa85b9af | 488 | case PTRACE_KILL: |
1da177e4 LT |
489 | ret = 0; |
490 | if (child->exit_state == EXIT_ZOMBIE) /* already dead */ | |
491 | break; | |
492 | clear_tsk_thread_flag(child, TIF_SINGLESTEP); | |
493 | child->exit_code = SIGKILL; | |
494 | /* make sure the single step bit is not set. */ | |
aa85b9af | 495 | clear_singlestep(child); |
1da177e4 LT |
496 | wake_up_process(child); |
497 | break; | |
1da177e4 | 498 | |
aa85b9af | 499 | case PTRACE_SINGLESTEP: /* set the trap flag. */ |
1da177e4 | 500 | ret = -EIO; |
7ed20e1a | 501 | if (!valid_signal(data)) |
1da177e4 LT |
502 | break; |
503 | clear_tsk_thread_flag(child,TIF_SYSCALL_TRACE); | |
aa85b9af | 504 | set_singlestep(child); |
1da177e4 LT |
505 | child->exit_code = data; |
506 | /* give it a chance to run. */ | |
507 | wake_up_process(child); | |
508 | ret = 0; | |
509 | break; | |
1da177e4 LT |
510 | |
511 | case PTRACE_DETACH: | |
512 | /* detach a process that was attached. */ | |
513 | ret = ptrace_detach(child, data); | |
514 | break; | |
515 | ||
516 | case PTRACE_GETREGS: { /* Get all gp regs from the child. */ | |
517 | if (!access_ok(VERIFY_WRITE, (unsigned __user *)data, | |
518 | sizeof(struct user_regs_struct))) { | |
519 | ret = -EIO; | |
520 | break; | |
521 | } | |
522 | ret = 0; | |
523 | for (ui = 0; ui < sizeof(struct user_regs_struct); ui += sizeof(long)) { | |
524 | ret |= __put_user(getreg(child, ui),(unsigned long __user *) data); | |
525 | data += sizeof(long); | |
526 | } | |
527 | break; | |
528 | } | |
529 | ||
530 | case PTRACE_SETREGS: { /* Set all gp regs in the child. */ | |
531 | unsigned long tmp; | |
532 | if (!access_ok(VERIFY_READ, (unsigned __user *)data, | |
533 | sizeof(struct user_regs_struct))) { | |
534 | ret = -EIO; | |
535 | break; | |
536 | } | |
537 | ret = 0; | |
538 | for (ui = 0; ui < sizeof(struct user_regs_struct); ui += sizeof(long)) { | |
539 | ret |= __get_user(tmp, (unsigned long __user *) data); | |
540 | putreg(child, ui, tmp); | |
541 | data += sizeof(long); | |
542 | } | |
543 | break; | |
544 | } | |
545 | ||
546 | case PTRACE_GETFPREGS: { /* Get the child extended FPU state. */ | |
547 | if (!access_ok(VERIFY_WRITE, (unsigned __user *)data, | |
548 | sizeof(struct user_i387_struct))) { | |
549 | ret = -EIO; | |
550 | break; | |
551 | } | |
552 | ret = get_fpregs((struct user_i387_struct __user *)data, child); | |
553 | break; | |
554 | } | |
555 | ||
556 | case PTRACE_SETFPREGS: { /* Set the child extended FPU state. */ | |
557 | if (!access_ok(VERIFY_READ, (unsigned __user *)data, | |
558 | sizeof(struct user_i387_struct))) { | |
559 | ret = -EIO; | |
560 | break; | |
561 | } | |
562 | set_stopped_child_used_math(child); | |
563 | ret = set_fpregs(child, (struct user_i387_struct __user *)data); | |
564 | break; | |
565 | } | |
566 | ||
567 | default: | |
568 | ret = ptrace_request(child, request, addr, data); | |
569 | break; | |
570 | } | |
1da177e4 LT |
571 | return ret; |
572 | } | |
573 | ||
574 | static void syscall_trace(struct pt_regs *regs) | |
575 | { | |
576 | ||
577 | #if 0 | |
578 | printk("trace %s rip %lx rsp %lx rax %d origrax %d caller %lx tiflags %x ptrace %x\n", | |
579 | current->comm, | |
580 | regs->rip, regs->rsp, regs->rax, regs->orig_rax, __builtin_return_address(0), | |
581 | current_thread_info()->flags, current->ptrace); | |
582 | #endif | |
583 | ||
584 | ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) | |
585 | ? 0x80 : 0)); | |
586 | /* | |
587 | * this isn't the same as continuing with a signal, but it will do | |
588 | * for normal use. strace only continues with a signal if the | |
589 | * stopping signal is not SIGTRAP. -brl | |
590 | */ | |
591 | if (current->exit_code) { | |
592 | send_sig(current->exit_code, current, 1); | |
593 | current->exit_code = 0; | |
594 | } | |
595 | } | |
596 | ||
597 | asmlinkage void syscall_trace_enter(struct pt_regs *regs) | |
598 | { | |
599 | /* do the secure computing check first */ | |
600 | secure_computing(regs->orig_rax); | |
601 | ||
2fd6f58b | 602 | if (test_thread_flag(TIF_SYSCALL_TRACE) |
603 | && (current->ptrace & PT_PTRACED)) | |
604 | syscall_trace(regs); | |
605 | ||
488f2eac DW |
606 | if (unlikely(current->audit_context)) { |
607 | if (test_thread_flag(TIF_IA32)) { | |
5411be59 | 608 | audit_syscall_entry(AUDIT_ARCH_I386, |
488f2eac DW |
609 | regs->orig_rax, |
610 | regs->rbx, regs->rcx, | |
611 | regs->rdx, regs->rsi); | |
612 | } else { | |
5411be59 | 613 | audit_syscall_entry(AUDIT_ARCH_X86_64, |
488f2eac DW |
614 | regs->orig_rax, |
615 | regs->rdi, regs->rsi, | |
616 | regs->rdx, regs->r10); | |
617 | } | |
618 | } | |
1da177e4 LT |
619 | } |
620 | ||
621 | asmlinkage void syscall_trace_leave(struct pt_regs *regs) | |
622 | { | |
623 | if (unlikely(current->audit_context)) | |
5411be59 | 624 | audit_syscall_exit(AUDITSC_RESULT(regs->rax), regs->rax); |
1da177e4 LT |
625 | |
626 | if ((test_thread_flag(TIF_SYSCALL_TRACE) | |
627 | || test_thread_flag(TIF_SINGLESTEP)) | |
628 | && (current->ptrace & PT_PTRACED)) | |
629 | syscall_trace(regs); | |
630 | } |