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Commit | Line | Data |
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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 | ||
29eb5110 | 105 | seg &= ~7UL; |
e502cdd6 | 106 | |
29eb5110 RM |
107 | down(&child->mm->context.sem); |
108 | if (unlikely((seg >> 3) >= child->mm->context.size)) | |
109 | addr = -1L; /* bogus selector, access would fault */ | |
110 | else { | |
111 | desc = child->mm->context.ldt + seg; | |
112 | base = ((desc[0] >> 16) | | |
113 | ((desc[1] & 0xff) << 16) | | |
114 | (desc[1] & 0xff000000)); | |
115 | ||
116 | /* 16-bit code segment? */ | |
117 | if (!((desc[1] >> 22) & 1)) | |
118 | addr &= 0xffff; | |
119 | addr += base; | |
120 | } | |
e502cdd6 AK |
121 | up(&child->mm->context.sem); |
122 | } | |
29eb5110 | 123 | |
e502cdd6 AK |
124 | return addr; |
125 | } | |
126 | ||
2ade2920 | 127 | static int is_setting_trap_flag(struct task_struct *child, struct pt_regs *regs) |
e502cdd6 AK |
128 | { |
129 | int i, copied; | |
2ade2920 | 130 | unsigned char opcode[15]; |
e502cdd6 AK |
131 | unsigned long addr = convert_rip_to_linear(child, regs); |
132 | ||
133 | copied = access_process_vm(child, addr, opcode, sizeof(opcode), 0); | |
134 | for (i = 0; i < copied; i++) { | |
135 | switch (opcode[i]) { | |
2ade2920 CE |
136 | /* popf and iret */ |
137 | case 0x9d: case 0xcf: | |
e502cdd6 AK |
138 | return 1; |
139 | ||
140 | /* CHECKME: 64 65 */ | |
141 | ||
142 | /* opcode and address size prefixes */ | |
143 | case 0x66: case 0x67: | |
144 | continue; | |
145 | /* irrelevant prefixes (segment overrides and repeats) */ | |
146 | case 0x26: case 0x2e: | |
147 | case 0x36: case 0x3e: | |
148 | case 0x64: case 0x65: | |
d4d35854 | 149 | case 0xf2: case 0xf3: |
e502cdd6 AK |
150 | continue; |
151 | ||
e502cdd6 | 152 | case 0x40 ... 0x4f: |
a752d719 CE |
153 | if (regs->cs != __USER_CS) |
154 | /* 32-bit mode: register increment */ | |
155 | return 0; | |
156 | /* 64-bit mode: REX prefix */ | |
e502cdd6 AK |
157 | continue; |
158 | ||
d4d35854 | 159 | /* CHECKME: f2, f3 */ |
e502cdd6 AK |
160 | |
161 | /* | |
162 | * pushf: NOTE! We should probably not let | |
163 | * the user see the TF bit being set. But | |
164 | * it's more pain than it's worth to avoid | |
165 | * it, and a debugger could emulate this | |
166 | * all in user space if it _really_ cares. | |
167 | */ | |
168 | case 0x9c: | |
169 | default: | |
170 | return 0; | |
171 | } | |
172 | } | |
173 | return 0; | |
174 | } | |
175 | ||
aa85b9af AK |
176 | static void set_singlestep(struct task_struct *child) |
177 | { | |
bb049232 | 178 | struct pt_regs *regs = task_pt_regs(child); |
aa85b9af AK |
179 | |
180 | /* | |
181 | * Always set TIF_SINGLESTEP - this guarantees that | |
182 | * we single-step system calls etc.. This will also | |
183 | * cause us to set TF when returning to user mode. | |
184 | */ | |
185 | set_tsk_thread_flag(child, TIF_SINGLESTEP); | |
186 | ||
187 | /* | |
188 | * If TF was already set, don't do anything else | |
189 | */ | |
190 | if (regs->eflags & TRAP_FLAG) | |
191 | return; | |
192 | ||
193 | /* Set TF on the kernel stack.. */ | |
194 | regs->eflags |= TRAP_FLAG; | |
195 | ||
e502cdd6 AK |
196 | /* |
197 | * ..but if TF is changed by the instruction we will trace, | |
198 | * don't mark it as being "us" that set it, so that we | |
199 | * won't clear it by hand later. | |
e502cdd6 | 200 | */ |
2ade2920 | 201 | if (is_setting_trap_flag(child, regs)) |
e502cdd6 AK |
202 | return; |
203 | ||
aa85b9af AK |
204 | child->ptrace |= PT_DTRACE; |
205 | } | |
206 | ||
207 | static void clear_singlestep(struct task_struct *child) | |
208 | { | |
209 | /* Always clear TIF_SINGLESTEP... */ | |
210 | clear_tsk_thread_flag(child, TIF_SINGLESTEP); | |
211 | ||
212 | /* But touch TF only if it was set by us.. */ | |
213 | if (child->ptrace & PT_DTRACE) { | |
bb049232 | 214 | struct pt_regs *regs = task_pt_regs(child); |
aa85b9af AK |
215 | regs->eflags &= ~TRAP_FLAG; |
216 | child->ptrace &= ~PT_DTRACE; | |
217 | } | |
218 | } | |
219 | ||
1da177e4 LT |
220 | /* |
221 | * Called by kernel/ptrace.c when detaching.. | |
222 | * | |
223 | * Make sure the single step bit is not set. | |
224 | */ | |
225 | void ptrace_disable(struct task_struct *child) | |
226 | { | |
aa85b9af | 227 | clear_singlestep(child); |
1da177e4 LT |
228 | } |
229 | ||
230 | static int putreg(struct task_struct *child, | |
231 | unsigned long regno, unsigned long value) | |
232 | { | |
233 | unsigned long tmp; | |
234 | ||
1da177e4 LT |
235 | switch (regno) { |
236 | case offsetof(struct user_regs_struct,fs): | |
237 | if (value && (value & 3) != 3) | |
238 | return -EIO; | |
239 | child->thread.fsindex = value & 0xffff; | |
240 | return 0; | |
241 | case offsetof(struct user_regs_struct,gs): | |
242 | if (value && (value & 3) != 3) | |
243 | return -EIO; | |
244 | child->thread.gsindex = value & 0xffff; | |
245 | return 0; | |
246 | case offsetof(struct user_regs_struct,ds): | |
247 | if (value && (value & 3) != 3) | |
248 | return -EIO; | |
249 | child->thread.ds = value & 0xffff; | |
250 | return 0; | |
251 | case offsetof(struct user_regs_struct,es): | |
252 | if (value && (value & 3) != 3) | |
253 | return -EIO; | |
254 | child->thread.es = value & 0xffff; | |
255 | return 0; | |
256 | case offsetof(struct user_regs_struct,ss): | |
257 | if ((value & 3) != 3) | |
258 | return -EIO; | |
259 | value &= 0xffff; | |
260 | return 0; | |
261 | case offsetof(struct user_regs_struct,fs_base): | |
84929801 | 262 | if (value >= TASK_SIZE_OF(child)) |
f6b8d477 | 263 | return -EIO; |
1da177e4 LT |
264 | child->thread.fs = value; |
265 | return 0; | |
266 | case offsetof(struct user_regs_struct,gs_base): | |
84929801 | 267 | if (value >= TASK_SIZE_OF(child)) |
f6b8d477 | 268 | return -EIO; |
1da177e4 LT |
269 | child->thread.gs = value; |
270 | return 0; | |
271 | case offsetof(struct user_regs_struct, eflags): | |
272 | value &= FLAG_MASK; | |
273 | tmp = get_stack_long(child, EFL_OFFSET); | |
274 | tmp &= ~FLAG_MASK; | |
275 | value |= tmp; | |
276 | break; | |
277 | case offsetof(struct user_regs_struct,cs): | |
278 | if ((value & 3) != 3) | |
279 | return -EIO; | |
280 | value &= 0xffff; | |
281 | break; | |
282 | } | |
283 | put_stack_long(child, regno - sizeof(struct pt_regs), value); | |
284 | return 0; | |
285 | } | |
286 | ||
287 | static unsigned long getreg(struct task_struct *child, unsigned long regno) | |
288 | { | |
289 | unsigned long val; | |
290 | switch (regno) { | |
291 | case offsetof(struct user_regs_struct, fs): | |
292 | return child->thread.fsindex; | |
293 | case offsetof(struct user_regs_struct, gs): | |
294 | return child->thread.gsindex; | |
295 | case offsetof(struct user_regs_struct, ds): | |
296 | return child->thread.ds; | |
297 | case offsetof(struct user_regs_struct, es): | |
298 | return child->thread.es; | |
299 | case offsetof(struct user_regs_struct, fs_base): | |
300 | return child->thread.fs; | |
301 | case offsetof(struct user_regs_struct, gs_base): | |
302 | return child->thread.gs; | |
303 | default: | |
304 | regno = regno - sizeof(struct pt_regs); | |
305 | val = get_stack_long(child, regno); | |
306 | if (test_tsk_thread_flag(child, TIF_IA32)) | |
307 | val &= 0xffffffff; | |
308 | return val; | |
309 | } | |
310 | ||
311 | } | |
312 | ||
481bed45 | 313 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 314 | { |
1da177e4 LT |
315 | long i, ret; |
316 | unsigned ui; | |
317 | ||
1da177e4 LT |
318 | switch (request) { |
319 | /* when I and D space are separate, these will need to be fixed. */ | |
320 | case PTRACE_PEEKTEXT: /* read word at location addr. */ | |
76647323 AD |
321 | case PTRACE_PEEKDATA: |
322 | ret = generic_ptrace_peekdata(child, addr, data); | |
1da177e4 | 323 | break; |
1da177e4 LT |
324 | |
325 | /* read the word at location addr in the USER area. */ | |
326 | case PTRACE_PEEKUSR: { | |
327 | unsigned long tmp; | |
328 | ||
329 | ret = -EIO; | |
330 | if ((addr & 7) || | |
331 | addr > sizeof(struct user) - 7) | |
332 | break; | |
333 | ||
334 | switch (addr) { | |
c4d1fcf3 | 335 | case 0 ... sizeof(struct user_regs_struct) - sizeof(long): |
1da177e4 LT |
336 | tmp = getreg(child, addr); |
337 | break; | |
338 | case offsetof(struct user, u_debugreg[0]): | |
339 | tmp = child->thread.debugreg0; | |
340 | break; | |
341 | case offsetof(struct user, u_debugreg[1]): | |
342 | tmp = child->thread.debugreg1; | |
343 | break; | |
344 | case offsetof(struct user, u_debugreg[2]): | |
345 | tmp = child->thread.debugreg2; | |
346 | break; | |
347 | case offsetof(struct user, u_debugreg[3]): | |
348 | tmp = child->thread.debugreg3; | |
349 | break; | |
350 | case offsetof(struct user, u_debugreg[6]): | |
351 | tmp = child->thread.debugreg6; | |
352 | break; | |
353 | case offsetof(struct user, u_debugreg[7]): | |
354 | tmp = child->thread.debugreg7; | |
355 | break; | |
356 | default: | |
357 | tmp = 0; | |
358 | break; | |
359 | } | |
360 | ret = put_user(tmp,(unsigned long __user *) data); | |
361 | break; | |
362 | } | |
363 | ||
364 | /* when I and D space are separate, this will have to be fixed. */ | |
365 | case PTRACE_POKETEXT: /* write the word at location addr. */ | |
366 | case PTRACE_POKEDATA: | |
f284ce72 | 367 | ret = generic_ptrace_pokedata(child, addr, data); |
1da177e4 LT |
368 | break; |
369 | ||
370 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ | |
84929801 SS |
371 | { |
372 | int dsize = test_tsk_thread_flag(child, TIF_IA32) ? 3 : 7; | |
1da177e4 LT |
373 | ret = -EIO; |
374 | if ((addr & 7) || | |
375 | addr > sizeof(struct user) - 7) | |
376 | break; | |
377 | ||
378 | switch (addr) { | |
c4d1fcf3 | 379 | case 0 ... sizeof(struct user_regs_struct) - sizeof(long): |
1da177e4 LT |
380 | ret = putreg(child, addr, data); |
381 | break; | |
382 | /* Disallows to set a breakpoint into the vsyscall */ | |
383 | case offsetof(struct user, u_debugreg[0]): | |
84929801 | 384 | if (data >= TASK_SIZE_OF(child) - dsize) break; |
1da177e4 LT |
385 | child->thread.debugreg0 = data; |
386 | ret = 0; | |
387 | break; | |
388 | case offsetof(struct user, u_debugreg[1]): | |
84929801 | 389 | if (data >= TASK_SIZE_OF(child) - dsize) break; |
1da177e4 LT |
390 | child->thread.debugreg1 = data; |
391 | ret = 0; | |
392 | break; | |
393 | case offsetof(struct user, u_debugreg[2]): | |
84929801 | 394 | if (data >= TASK_SIZE_OF(child) - dsize) break; |
1da177e4 LT |
395 | child->thread.debugreg2 = data; |
396 | ret = 0; | |
397 | break; | |
398 | case offsetof(struct user, u_debugreg[3]): | |
84929801 | 399 | if (data >= TASK_SIZE_OF(child) - dsize) break; |
1da177e4 LT |
400 | child->thread.debugreg3 = data; |
401 | ret = 0; | |
402 | break; | |
403 | case offsetof(struct user, u_debugreg[6]): | |
404 | if (data >> 32) | |
405 | break; | |
406 | child->thread.debugreg6 = data; | |
407 | ret = 0; | |
408 | break; | |
409 | case offsetof(struct user, u_debugreg[7]): | |
410 | /* See arch/i386/kernel/ptrace.c for an explanation of | |
411 | * this awkward check.*/ | |
893efca9 JB |
412 | data &= ~DR_CONTROL_RESERVED; |
413 | for(i=0; i<4; i++) | |
414 | if ((0x5554 >> ((data >> (16 + 4*i)) & 0xf)) & 1) | |
1da177e4 LT |
415 | break; |
416 | if (i == 4) { | |
d3a4f48d SE |
417 | child->thread.debugreg7 = data; |
418 | if (data) | |
419 | set_tsk_thread_flag(child, TIF_DEBUG); | |
420 | else | |
421 | clear_tsk_thread_flag(child, TIF_DEBUG); | |
1da177e4 | 422 | ret = 0; |
d3a4f48d | 423 | } |
1da177e4 LT |
424 | break; |
425 | } | |
426 | break; | |
84929801 | 427 | } |
1da177e4 | 428 | case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ |
aa85b9af | 429 | case PTRACE_CONT: /* restart after signal. */ |
1da177e4 LT |
430 | |
431 | ret = -EIO; | |
7ed20e1a | 432 | if (!valid_signal(data)) |
1da177e4 LT |
433 | break; |
434 | if (request == PTRACE_SYSCALL) | |
435 | set_tsk_thread_flag(child,TIF_SYSCALL_TRACE); | |
436 | else | |
437 | clear_tsk_thread_flag(child,TIF_SYSCALL_TRACE); | |
438 | clear_tsk_thread_flag(child, TIF_SINGLESTEP); | |
439 | child->exit_code = data; | |
aa85b9af AK |
440 | /* make sure the single step bit is not set. */ |
441 | clear_singlestep(child); | |
1da177e4 LT |
442 | wake_up_process(child); |
443 | ret = 0; | |
444 | break; | |
1da177e4 LT |
445 | |
446 | #ifdef CONFIG_IA32_EMULATION | |
447 | /* This makes only sense with 32bit programs. Allow a | |
448 | 64bit debugger to fully examine them too. Better | |
449 | don't use it against 64bit processes, use | |
450 | PTRACE_ARCH_PRCTL instead. */ | |
451 | case PTRACE_SET_THREAD_AREA: { | |
452 | struct user_desc __user *p; | |
453 | int old; | |
454 | p = (struct user_desc __user *)data; | |
455 | get_user(old, &p->entry_number); | |
456 | put_user(addr, &p->entry_number); | |
457 | ret = do_set_thread_area(&child->thread, p); | |
458 | put_user(old, &p->entry_number); | |
459 | break; | |
460 | case PTRACE_GET_THREAD_AREA: | |
461 | p = (struct user_desc __user *)data; | |
462 | get_user(old, &p->entry_number); | |
463 | put_user(addr, &p->entry_number); | |
464 | ret = do_get_thread_area(&child->thread, p); | |
465 | put_user(old, &p->entry_number); | |
466 | break; | |
467 | } | |
468 | #endif | |
469 | /* normal 64bit interface to access TLS data. | |
470 | Works just like arch_prctl, except that the arguments | |
471 | are reversed. */ | |
472 | case PTRACE_ARCH_PRCTL: | |
473 | ret = do_arch_prctl(child, data, addr); | |
474 | break; | |
475 | ||
476 | /* | |
477 | * make the child exit. Best I can do is send it a sigkill. | |
478 | * perhaps it should be put in the status that it wants to | |
479 | * exit. | |
480 | */ | |
aa85b9af | 481 | case PTRACE_KILL: |
1da177e4 LT |
482 | ret = 0; |
483 | if (child->exit_state == EXIT_ZOMBIE) /* already dead */ | |
484 | break; | |
485 | clear_tsk_thread_flag(child, TIF_SINGLESTEP); | |
486 | child->exit_code = SIGKILL; | |
487 | /* make sure the single step bit is not set. */ | |
aa85b9af | 488 | clear_singlestep(child); |
1da177e4 LT |
489 | wake_up_process(child); |
490 | break; | |
1da177e4 | 491 | |
aa85b9af | 492 | case PTRACE_SINGLESTEP: /* set the trap flag. */ |
1da177e4 | 493 | ret = -EIO; |
7ed20e1a | 494 | if (!valid_signal(data)) |
1da177e4 LT |
495 | break; |
496 | clear_tsk_thread_flag(child,TIF_SYSCALL_TRACE); | |
aa85b9af | 497 | set_singlestep(child); |
1da177e4 LT |
498 | child->exit_code = data; |
499 | /* give it a chance to run. */ | |
500 | wake_up_process(child); | |
501 | ret = 0; | |
502 | break; | |
1da177e4 LT |
503 | |
504 | case PTRACE_DETACH: | |
505 | /* detach a process that was attached. */ | |
506 | ret = ptrace_detach(child, data); | |
507 | break; | |
508 | ||
509 | case PTRACE_GETREGS: { /* Get all gp regs from the child. */ | |
510 | if (!access_ok(VERIFY_WRITE, (unsigned __user *)data, | |
511 | sizeof(struct user_regs_struct))) { | |
512 | ret = -EIO; | |
513 | break; | |
514 | } | |
515 | ret = 0; | |
516 | for (ui = 0; ui < sizeof(struct user_regs_struct); ui += sizeof(long)) { | |
517 | ret |= __put_user(getreg(child, ui),(unsigned long __user *) data); | |
518 | data += sizeof(long); | |
519 | } | |
520 | break; | |
521 | } | |
522 | ||
523 | case PTRACE_SETREGS: { /* Set all gp regs in the child. */ | |
524 | unsigned long tmp; | |
525 | if (!access_ok(VERIFY_READ, (unsigned __user *)data, | |
526 | sizeof(struct user_regs_struct))) { | |
527 | ret = -EIO; | |
528 | break; | |
529 | } | |
530 | ret = 0; | |
531 | for (ui = 0; ui < sizeof(struct user_regs_struct); ui += sizeof(long)) { | |
f49481bc AK |
532 | ret = __get_user(tmp, (unsigned long __user *) data); |
533 | if (ret) | |
534 | break; | |
535 | ret = putreg(child, ui, tmp); | |
536 | if (ret) | |
537 | break; | |
1da177e4 LT |
538 | data += sizeof(long); |
539 | } | |
540 | break; | |
541 | } | |
542 | ||
543 | case PTRACE_GETFPREGS: { /* Get the child extended FPU state. */ | |
544 | if (!access_ok(VERIFY_WRITE, (unsigned __user *)data, | |
545 | sizeof(struct user_i387_struct))) { | |
546 | ret = -EIO; | |
547 | break; | |
548 | } | |
549 | ret = get_fpregs((struct user_i387_struct __user *)data, child); | |
550 | break; | |
551 | } | |
552 | ||
553 | case PTRACE_SETFPREGS: { /* Set the child extended FPU state. */ | |
554 | if (!access_ok(VERIFY_READ, (unsigned __user *)data, | |
555 | sizeof(struct user_i387_struct))) { | |
556 | ret = -EIO; | |
557 | break; | |
558 | } | |
559 | set_stopped_child_used_math(child); | |
560 | ret = set_fpregs(child, (struct user_i387_struct __user *)data); | |
561 | break; | |
562 | } | |
563 | ||
564 | default: | |
565 | ret = ptrace_request(child, request, addr, data); | |
566 | break; | |
567 | } | |
1da177e4 LT |
568 | return ret; |
569 | } | |
570 | ||
571 | static void syscall_trace(struct pt_regs *regs) | |
572 | { | |
573 | ||
574 | #if 0 | |
575 | printk("trace %s rip %lx rsp %lx rax %d origrax %d caller %lx tiflags %x ptrace %x\n", | |
576 | current->comm, | |
577 | regs->rip, regs->rsp, regs->rax, regs->orig_rax, __builtin_return_address(0), | |
578 | current_thread_info()->flags, current->ptrace); | |
579 | #endif | |
580 | ||
581 | ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) | |
582 | ? 0x80 : 0)); | |
583 | /* | |
584 | * this isn't the same as continuing with a signal, but it will do | |
585 | * for normal use. strace only continues with a signal if the | |
586 | * stopping signal is not SIGTRAP. -brl | |
587 | */ | |
588 | if (current->exit_code) { | |
589 | send_sig(current->exit_code, current, 1); | |
590 | current->exit_code = 0; | |
591 | } | |
592 | } | |
593 | ||
594 | asmlinkage void syscall_trace_enter(struct pt_regs *regs) | |
595 | { | |
596 | /* do the secure computing check first */ | |
597 | secure_computing(regs->orig_rax); | |
598 | ||
2fd6f58b DW |
599 | if (test_thread_flag(TIF_SYSCALL_TRACE) |
600 | && (current->ptrace & PT_PTRACED)) | |
601 | syscall_trace(regs); | |
602 | ||
488f2eac DW |
603 | if (unlikely(current->audit_context)) { |
604 | if (test_thread_flag(TIF_IA32)) { | |
5411be59 | 605 | audit_syscall_entry(AUDIT_ARCH_I386, |
488f2eac DW |
606 | regs->orig_rax, |
607 | regs->rbx, regs->rcx, | |
608 | regs->rdx, regs->rsi); | |
609 | } else { | |
5411be59 | 610 | audit_syscall_entry(AUDIT_ARCH_X86_64, |
488f2eac DW |
611 | regs->orig_rax, |
612 | regs->rdi, regs->rsi, | |
613 | regs->rdx, regs->r10); | |
614 | } | |
615 | } | |
1da177e4 LT |
616 | } |
617 | ||
618 | asmlinkage void syscall_trace_leave(struct pt_regs *regs) | |
619 | { | |
620 | if (unlikely(current->audit_context)) | |
5411be59 | 621 | audit_syscall_exit(AUDITSC_RESULT(regs->rax), regs->rax); |
1da177e4 LT |
622 | |
623 | if ((test_thread_flag(TIF_SYSCALL_TRACE) | |
624 | || test_thread_flag(TIF_SINGLESTEP)) | |
625 | && (current->ptrace & PT_PTRACED)) | |
626 | syscall_trace(regs); | |
627 | } |