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1da177e4 LT |
1 | /* Signal support for 32-bit kernel builds |
2 | * | |
3 | * Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org> | |
d104f11c KM |
4 | * Copyright (C) 2006 Kyle McMartin <kyle at parisc-linux.org> |
5 | * | |
1da177e4 LT |
6 | * Code was mostly borrowed from kernel/signal.c. |
7 | * See kernel/signal.c for additional Copyrights. | |
8 | * | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | ||
25 | #include <linux/compat.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/unistd.h> | |
1da177e4 LT |
29 | #include <linux/init.h> |
30 | #include <linux/sched.h> | |
31 | #include <linux/syscalls.h> | |
32 | #include <linux/types.h> | |
33 | #include <linux/errno.h> | |
34 | ||
1da177e4 LT |
35 | #include <asm/uaccess.h> |
36 | ||
37 | #include "signal32.h" | |
38 | #include "sys32.h" | |
39 | ||
40 | #define DEBUG_COMPAT_SIG 0 | |
41 | #define DEBUG_COMPAT_SIG_LEVEL 2 | |
42 | ||
43 | #if DEBUG_COMPAT_SIG | |
44 | #define DBG(LEVEL, ...) \ | |
45 | ((DEBUG_COMPAT_SIG_LEVEL >= LEVEL) \ | |
46 | ? printk(__VA_ARGS__) : (void) 0) | |
47 | #else | |
48 | #define DBG(LEVEL, ...) | |
49 | #endif | |
50 | ||
51 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
52 | ||
53 | inline void | |
54 | sigset_32to64(sigset_t *s64, compat_sigset_t *s32) | |
55 | { | |
56 | s64->sig[0] = s32->sig[0] | ((unsigned long)s32->sig[1] << 32); | |
57 | } | |
58 | ||
59 | inline void | |
60 | sigset_64to32(compat_sigset_t *s32, sigset_t *s64) | |
61 | { | |
62 | s32->sig[0] = s64->sig[0] & 0xffffffffUL; | |
63 | s32->sig[1] = (s64->sig[0] >> 32) & 0xffffffffUL; | |
64 | } | |
65 | ||
66 | static int | |
67 | put_sigset32(compat_sigset_t __user *up, sigset_t *set, size_t sz) | |
68 | { | |
69 | compat_sigset_t s; | |
70 | ||
71 | if (sz != sizeof *set) panic("put_sigset32()"); | |
72 | sigset_64to32(&s, set); | |
73 | ||
74 | return copy_to_user(up, &s, sizeof s); | |
75 | } | |
76 | ||
77 | static int | |
78 | get_sigset32(compat_sigset_t __user *up, sigset_t *set, size_t sz) | |
79 | { | |
80 | compat_sigset_t s; | |
81 | int r; | |
82 | ||
83 | if (sz != sizeof *set) panic("put_sigset32()"); | |
84 | ||
85 | if ((r = copy_from_user(&s, up, sz)) == 0) { | |
86 | sigset_32to64(set, &s); | |
87 | } | |
88 | ||
89 | return r; | |
90 | } | |
91 | ||
92 | int sys32_rt_sigprocmask(int how, compat_sigset_t __user *set, compat_sigset_t __user *oset, | |
93 | unsigned int sigsetsize) | |
94 | { | |
95 | sigset_t old_set, new_set; | |
96 | int ret; | |
97 | ||
98 | if (set && get_sigset32(set, &new_set, sigsetsize)) | |
99 | return -EFAULT; | |
100 | ||
101 | KERNEL_SYSCALL(ret, sys_rt_sigprocmask, how, set ? (sigset_t __user *)&new_set : NULL, | |
102 | oset ? (sigset_t __user *)&old_set : NULL, sigsetsize); | |
103 | ||
104 | if (!ret && oset && put_sigset32(oset, &old_set, sigsetsize)) | |
105 | return -EFAULT; | |
106 | ||
107 | return ret; | |
108 | } | |
109 | ||
110 | ||
111 | int sys32_rt_sigpending(compat_sigset_t __user *uset, unsigned int sigsetsize) | |
112 | { | |
113 | int ret; | |
114 | sigset_t set; | |
115 | ||
116 | KERNEL_SYSCALL(ret, sys_rt_sigpending, (sigset_t __user *)&set, sigsetsize); | |
117 | ||
118 | if (!ret && put_sigset32(uset, &set, sigsetsize)) | |
119 | return -EFAULT; | |
120 | ||
121 | return ret; | |
122 | } | |
123 | ||
124 | long | |
125 | sys32_rt_sigaction(int sig, const struct sigaction32 __user *act, struct sigaction32 __user *oact, | |
126 | size_t sigsetsize) | |
127 | { | |
128 | struct k_sigaction32 new_sa32, old_sa32; | |
129 | struct k_sigaction new_sa, old_sa; | |
130 | int ret = -EINVAL; | |
131 | ||
132 | if (act) { | |
133 | if (copy_from_user(&new_sa32.sa, act, sizeof new_sa32.sa)) | |
134 | return -EFAULT; | |
135 | new_sa.sa.sa_handler = (__sighandler_t)(unsigned long)new_sa32.sa.sa_handler; | |
136 | new_sa.sa.sa_flags = new_sa32.sa.sa_flags; | |
137 | sigset_32to64(&new_sa.sa.sa_mask, &new_sa32.sa.sa_mask); | |
138 | } | |
139 | ||
140 | ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL); | |
141 | ||
142 | if (!ret && oact) { | |
143 | sigset_64to32(&old_sa32.sa.sa_mask, &old_sa.sa.sa_mask); | |
144 | old_sa32.sa.sa_flags = old_sa.sa.sa_flags; | |
145 | old_sa32.sa.sa_handler = (__sighandler_t32)(unsigned long)old_sa.sa.sa_handler; | |
146 | if (copy_to_user(oact, &old_sa32.sa, sizeof old_sa32.sa)) | |
147 | return -EFAULT; | |
148 | } | |
149 | return ret; | |
150 | } | |
151 | ||
152 | int | |
153 | do_sigaltstack32 (const compat_stack_t __user *uss32, compat_stack_t __user *uoss32, unsigned long sp) | |
154 | { | |
155 | compat_stack_t ss32, oss32; | |
156 | stack_t ss, oss; | |
157 | stack_t *ssp = NULL, *ossp = NULL; | |
158 | int ret; | |
159 | ||
160 | if (uss32) { | |
161 | if (copy_from_user(&ss32, uss32, sizeof ss32)) | |
162 | return -EFAULT; | |
163 | ||
164 | ss.ss_sp = (void __user *)(unsigned long)ss32.ss_sp; | |
165 | ss.ss_flags = ss32.ss_flags; | |
166 | ss.ss_size = ss32.ss_size; | |
167 | ||
168 | ssp = &ss; | |
169 | } | |
170 | ||
171 | if (uoss32) | |
172 | ossp = &oss; | |
173 | ||
174 | KERNEL_SYSCALL(ret, do_sigaltstack, (const stack_t __user *)ssp, (stack_t __user *)ossp, sp); | |
175 | ||
176 | if (!ret && uoss32) { | |
177 | oss32.ss_sp = (unsigned int)(unsigned long)oss.ss_sp; | |
178 | oss32.ss_flags = oss.ss_flags; | |
179 | oss32.ss_size = oss.ss_size; | |
180 | if (copy_to_user(uoss32, &oss32, sizeof *uoss32)) | |
181 | return -EFAULT; | |
182 | } | |
183 | ||
184 | return ret; | |
185 | } | |
186 | ||
187 | long | |
188 | restore_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __user * rf, | |
189 | struct pt_regs *regs) | |
190 | { | |
191 | long err = 0; | |
192 | compat_uint_t compat_reg; | |
193 | compat_uint_t compat_regt; | |
194 | int regn; | |
195 | ||
196 | /* When loading 32-bit values into 64-bit registers make | |
197 | sure to clear the upper 32-bits */ | |
198 | DBG(2,"restore_sigcontext32: PER_LINUX32 process\n"); | |
199 | DBG(2,"restore_sigcontext32: sc = 0x%p, rf = 0x%p, regs = 0x%p\n", sc, rf, regs); | |
200 | DBG(2,"restore_sigcontext32: compat_sigcontext is %#lx bytes\n", sizeof(*sc)); | |
201 | for(regn=0; regn < 32; regn++){ | |
202 | err |= __get_user(compat_reg,&sc->sc_gr[regn]); | |
203 | regs->gr[regn] = compat_reg; | |
204 | /* Load upper half */ | |
205 | err |= __get_user(compat_regt,&rf->rf_gr[regn]); | |
206 | regs->gr[regn] = ((u64)compat_regt << 32) | (u64)compat_reg; | |
207 | DBG(3,"restore_sigcontext32: gr%02d = %#lx (%#x / %#x)\n", | |
208 | regn, regs->gr[regn], compat_regt, compat_reg); | |
209 | } | |
210 | DBG(2,"restore_sigcontext32: sc->sc_fr = 0x%p (%#lx)\n",sc->sc_fr, sizeof(sc->sc_fr)); | |
211 | /* XXX: BE WARNED FR's are 64-BIT! */ | |
212 | err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr)); | |
213 | ||
214 | /* Better safe than sorry, pass __get_user two things of | |
215 | the same size and let gcc do the upward conversion to | |
216 | 64-bits */ | |
217 | err |= __get_user(compat_reg, &sc->sc_iaoq[0]); | |
218 | /* Load upper half */ | |
219 | err |= __get_user(compat_regt, &rf->rf_iaoq[0]); | |
220 | regs->iaoq[0] = ((u64)compat_regt << 32) | (u64)compat_reg; | |
221 | DBG(2,"restore_sigcontext32: upper half of iaoq[0] = %#lx\n", compat_regt); | |
222 | DBG(2,"restore_sigcontext32: sc->sc_iaoq[0] = %p => %#x\n", | |
223 | &sc->sc_iaoq[0], compat_reg); | |
224 | ||
225 | err |= __get_user(compat_reg, &sc->sc_iaoq[1]); | |
226 | /* Load upper half */ | |
227 | err |= __get_user(compat_regt, &rf->rf_iaoq[1]); | |
228 | regs->iaoq[1] = ((u64)compat_regt << 32) | (u64)compat_reg; | |
229 | DBG(2,"restore_sigcontext32: upper half of iaoq[1] = %#lx\n", compat_regt); | |
230 | DBG(2,"restore_sigcontext32: sc->sc_iaoq[1] = %p => %#x\n", | |
231 | &sc->sc_iaoq[1],compat_reg); | |
232 | DBG(2,"restore_sigcontext32: iaoq is %#lx / %#lx\n", | |
233 | regs->iaoq[0],regs->iaoq[1]); | |
234 | ||
235 | err |= __get_user(compat_reg, &sc->sc_iasq[0]); | |
236 | /* Load the upper half for iasq */ | |
237 | err |= __get_user(compat_regt, &rf->rf_iasq[0]); | |
238 | regs->iasq[0] = ((u64)compat_regt << 32) | (u64)compat_reg; | |
239 | DBG(2,"restore_sigcontext32: upper half of iasq[0] = %#lx\n", compat_regt); | |
240 | ||
241 | err |= __get_user(compat_reg, &sc->sc_iasq[1]); | |
242 | /* Load the upper half for iasq */ | |
243 | err |= __get_user(compat_regt, &rf->rf_iasq[1]); | |
244 | regs->iasq[1] = ((u64)compat_regt << 32) | (u64)compat_reg; | |
245 | DBG(2,"restore_sigcontext32: upper half of iasq[1] = %#lx\n", compat_regt); | |
246 | DBG(2,"restore_sigcontext32: iasq is %#lx / %#lx\n", | |
247 | regs->iasq[0],regs->iasq[1]); | |
248 | ||
249 | err |= __get_user(compat_reg, &sc->sc_sar); | |
250 | /* Load the upper half for sar */ | |
251 | err |= __get_user(compat_regt, &rf->rf_sar); | |
252 | regs->sar = ((u64)compat_regt << 32) | (u64)compat_reg; | |
253 | DBG(2,"restore_sigcontext32: upper_half & sar = %#lx\n", compat_regt); | |
254 | DBG(2,"restore_sigcontext32: sar is %#lx\n", regs->sar); | |
255 | DBG(2,"restore_sigcontext32: r28 is %ld\n", regs->gr[28]); | |
256 | ||
257 | return err; | |
258 | } | |
259 | ||
260 | /* | |
261 | * Set up the sigcontext structure for this process. | |
262 | * This is not an easy task if the kernel is 64-bit, it will require | |
263 | * that we examine the process personality to determine if we need to | |
264 | * truncate for a 32-bit userspace. | |
265 | */ | |
266 | long | |
267 | setup_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __user * rf, | |
268 | struct pt_regs *regs, int in_syscall) | |
269 | { | |
270 | compat_int_t flags = 0; | |
271 | long err = 0; | |
272 | compat_uint_t compat_reg; | |
273 | compat_uint_t compat_regb; | |
274 | int regn; | |
275 | ||
276 | if (on_sig_stack((unsigned long) sc)) | |
277 | flags |= PARISC_SC_FLAG_ONSTACK; | |
278 | ||
279 | if (in_syscall) { | |
280 | ||
281 | DBG(1,"setup_sigcontext32: in_syscall\n"); | |
282 | ||
283 | flags |= PARISC_SC_FLAG_IN_SYSCALL; | |
284 | /* Truncate gr31 */ | |
285 | compat_reg = (compat_uint_t)(regs->gr[31]); | |
286 | /* regs->iaoq is undefined in the syscall return path */ | |
287 | err |= __put_user(compat_reg, &sc->sc_iaoq[0]); | |
288 | DBG(2,"setup_sigcontext32: sc->sc_iaoq[0] = %p <= %#x\n", | |
289 | &sc->sc_iaoq[0], compat_reg); | |
290 | ||
291 | /* Store upper half */ | |
f4441b62 | 292 | compat_reg = (compat_uint_t)(regs->gr[31] >> 32); |
1da177e4 LT |
293 | err |= __put_user(compat_reg, &rf->rf_iaoq[0]); |
294 | DBG(2,"setup_sigcontext32: upper half iaoq[0] = %#x\n", compat_reg); | |
295 | ||
296 | ||
297 | compat_reg = (compat_uint_t)(regs->gr[31]+4); | |
298 | err |= __put_user(compat_reg, &sc->sc_iaoq[1]); | |
299 | DBG(2,"setup_sigcontext32: sc->sc_iaoq[1] = %p <= %#x\n", | |
300 | &sc->sc_iaoq[1], compat_reg); | |
301 | /* Store upper half */ | |
f4441b62 | 302 | compat_reg = (compat_uint_t)((regs->gr[31]+4) >> 32); |
1da177e4 LT |
303 | err |= __put_user(compat_reg, &rf->rf_iaoq[1]); |
304 | DBG(2,"setup_sigcontext32: upper half iaoq[1] = %#x\n", compat_reg); | |
305 | ||
306 | /* Truncate sr3 */ | |
307 | compat_reg = (compat_uint_t)(regs->sr[3]); | |
308 | err |= __put_user(compat_reg, &sc->sc_iasq[0]); | |
309 | err |= __put_user(compat_reg, &sc->sc_iasq[1]); | |
310 | ||
311 | /* Store upper half */ | |
312 | compat_reg = (compat_uint_t)(regs->sr[3] >> 32); | |
313 | err |= __put_user(compat_reg, &rf->rf_iasq[0]); | |
314 | err |= __put_user(compat_reg, &rf->rf_iasq[1]); | |
315 | ||
316 | DBG(2,"setup_sigcontext32: upper half iasq[0] = %#x\n", compat_reg); | |
317 | DBG(2,"setup_sigcontext32: upper half iasq[1] = %#x\n", compat_reg); | |
318 | DBG(1,"setup_sigcontext32: iaoq %#lx / %#lx\n", | |
319 | regs->gr[31], regs->gr[31]+4); | |
320 | ||
321 | } else { | |
322 | ||
323 | compat_reg = (compat_uint_t)(regs->iaoq[0]); | |
324 | err |= __put_user(compat_reg, &sc->sc_iaoq[0]); | |
325 | DBG(2,"setup_sigcontext32: sc->sc_iaoq[0] = %p <= %#x\n", | |
326 | &sc->sc_iaoq[0], compat_reg); | |
327 | /* Store upper half */ | |
328 | compat_reg = (compat_uint_t)(regs->iaoq[0] >> 32); | |
329 | err |= __put_user(compat_reg, &rf->rf_iaoq[0]); | |
330 | DBG(2,"setup_sigcontext32: upper half iaoq[0] = %#x\n", compat_reg); | |
331 | ||
332 | compat_reg = (compat_uint_t)(regs->iaoq[1]); | |
333 | err |= __put_user(compat_reg, &sc->sc_iaoq[1]); | |
334 | DBG(2,"setup_sigcontext32: sc->sc_iaoq[1] = %p <= %#x\n", | |
335 | &sc->sc_iaoq[1], compat_reg); | |
336 | /* Store upper half */ | |
337 | compat_reg = (compat_uint_t)(regs->iaoq[1] >> 32); | |
338 | err |= __put_user(compat_reg, &rf->rf_iaoq[1]); | |
339 | DBG(2,"setup_sigcontext32: upper half iaoq[1] = %#x\n", compat_reg); | |
340 | ||
341 | ||
342 | compat_reg = (compat_uint_t)(regs->iasq[0]); | |
343 | err |= __put_user(compat_reg, &sc->sc_iasq[0]); | |
344 | DBG(2,"setup_sigcontext32: sc->sc_iasq[0] = %p <= %#x\n", | |
345 | &sc->sc_iasq[0], compat_reg); | |
346 | /* Store upper half */ | |
347 | compat_reg = (compat_uint_t)(regs->iasq[0] >> 32); | |
348 | err |= __put_user(compat_reg, &rf->rf_iasq[0]); | |
349 | DBG(2,"setup_sigcontext32: upper half iasq[0] = %#x\n", compat_reg); | |
350 | ||
351 | ||
352 | compat_reg = (compat_uint_t)(regs->iasq[1]); | |
353 | err |= __put_user(compat_reg, &sc->sc_iasq[1]); | |
354 | DBG(2,"setup_sigcontext32: sc->sc_iasq[1] = %p <= %#x\n", | |
355 | &sc->sc_iasq[1], compat_reg); | |
356 | /* Store upper half */ | |
357 | compat_reg = (compat_uint_t)(regs->iasq[1] >> 32); | |
358 | err |= __put_user(compat_reg, &rf->rf_iasq[1]); | |
359 | DBG(2,"setup_sigcontext32: upper half iasq[1] = %#x\n", compat_reg); | |
360 | ||
361 | /* Print out the IAOQ for debugging */ | |
362 | DBG(1,"setup_sigcontext32: ia0q %#lx / %#lx\n", | |
363 | regs->iaoq[0], regs->iaoq[1]); | |
364 | } | |
365 | ||
366 | err |= __put_user(flags, &sc->sc_flags); | |
367 | ||
368 | DBG(1,"setup_sigcontext32: Truncating general registers.\n"); | |
369 | ||
370 | for(regn=0; regn < 32; regn++){ | |
371 | /* Truncate a general register */ | |
372 | compat_reg = (compat_uint_t)(regs->gr[regn]); | |
373 | err |= __put_user(compat_reg, &sc->sc_gr[regn]); | |
374 | /* Store upper half */ | |
375 | compat_regb = (compat_uint_t)(regs->gr[regn] >> 32); | |
376 | err |= __put_user(compat_regb, &rf->rf_gr[regn]); | |
377 | ||
378 | /* DEBUG: Write out the "upper / lower" register data */ | |
379 | DBG(2,"setup_sigcontext32: gr%02d = %#x / %#x\n", regn, | |
380 | compat_regb, compat_reg); | |
381 | } | |
382 | ||
383 | /* Copy the floating point registers (same size) | |
384 | XXX: BE WARNED FR's are 64-BIT! */ | |
385 | DBG(1,"setup_sigcontext32: Copying from regs to sc, " | |
386 | "sc->sc_fr size = %#lx, regs->fr size = %#lx\n", | |
387 | sizeof(regs->fr), sizeof(sc->sc_fr)); | |
388 | err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr)); | |
389 | ||
390 | compat_reg = (compat_uint_t)(regs->sar); | |
391 | err |= __put_user(compat_reg, &sc->sc_sar); | |
392 | DBG(2,"setup_sigcontext32: sar is %#x\n", compat_reg); | |
393 | /* Store upper half */ | |
394 | compat_reg = (compat_uint_t)(regs->sar >> 32); | |
395 | err |= __put_user(compat_reg, &rf->rf_sar); | |
396 | DBG(2,"setup_sigcontext32: upper half sar = %#x\n", compat_reg); | |
397 | DBG(1,"setup_sigcontext32: r28 is %ld\n", regs->gr[28]); | |
398 | ||
399 | return err; | |
400 | } | |
f671c45d KM |
401 | |
402 | int | |
403 | copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from) | |
404 | { | |
f6744bdd | 405 | compat_uptr_t addr; |
f671c45d KM |
406 | int err; |
407 | ||
408 | if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t))) | |
409 | return -EFAULT; | |
410 | ||
411 | err = __get_user(to->si_signo, &from->si_signo); | |
412 | err |= __get_user(to->si_errno, &from->si_errno); | |
413 | err |= __get_user(to->si_code, &from->si_code); | |
414 | ||
415 | if (to->si_code < 0) | |
416 | err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
417 | else { | |
418 | switch (to->si_code >> 16) { | |
419 | case __SI_CHLD >> 16: | |
420 | err |= __get_user(to->si_utime, &from->si_utime); | |
421 | err |= __get_user(to->si_stime, &from->si_stime); | |
422 | err |= __get_user(to->si_status, &from->si_status); | |
423 | default: | |
424 | err |= __get_user(to->si_pid, &from->si_pid); | |
425 | err |= __get_user(to->si_uid, &from->si_uid); | |
426 | break; | |
427 | case __SI_FAULT >> 16: | |
f6744bdd CDJ |
428 | err |= __get_user(addr, &from->si_addr); |
429 | to->si_addr = compat_ptr(addr); | |
f671c45d KM |
430 | break; |
431 | case __SI_POLL >> 16: | |
432 | err |= __get_user(to->si_band, &from->si_band); | |
433 | err |= __get_user(to->si_fd, &from->si_fd); | |
434 | break; | |
435 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
436 | case __SI_MESGQ >> 16: | |
437 | err |= __get_user(to->si_pid, &from->si_pid); | |
438 | err |= __get_user(to->si_uid, &from->si_uid); | |
439 | err |= __get_user(to->si_int, &from->si_int); | |
440 | break; | |
441 | } | |
442 | } | |
443 | return err; | |
444 | } | |
445 | ||
446 | int | |
447 | copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from) | |
448 | { | |
f6744bdd CDJ |
449 | compat_uptr_t addr; |
450 | compat_int_t val; | |
f671c45d KM |
451 | int err; |
452 | ||
453 | if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
454 | return -EFAULT; | |
455 | ||
456 | /* If you change siginfo_t structure, please be sure | |
457 | this code is fixed accordingly. | |
458 | It should never copy any pad contained in the structure | |
459 | to avoid security leaks, but must copy the generic | |
460 | 3 ints plus the relevant union member. | |
461 | This routine must convert siginfo from 64bit to 32bit as well | |
462 | at the same time. */ | |
463 | err = __put_user(from->si_signo, &to->si_signo); | |
464 | err |= __put_user(from->si_errno, &to->si_errno); | |
465 | err |= __put_user((short)from->si_code, &to->si_code); | |
466 | if (from->si_code < 0) | |
467 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
468 | else { | |
469 | switch (from->si_code >> 16) { | |
470 | case __SI_CHLD >> 16: | |
471 | err |= __put_user(from->si_utime, &to->si_utime); | |
472 | err |= __put_user(from->si_stime, &to->si_stime); | |
473 | err |= __put_user(from->si_status, &to->si_status); | |
474 | default: | |
475 | err |= __put_user(from->si_pid, &to->si_pid); | |
476 | err |= __put_user(from->si_uid, &to->si_uid); | |
477 | break; | |
478 | case __SI_FAULT >> 16: | |
f6744bdd CDJ |
479 | addr = ptr_to_compat(from->si_addr); |
480 | err |= __put_user(addr, &to->si_addr); | |
f671c45d KM |
481 | break; |
482 | case __SI_POLL >> 16: | |
483 | err |= __put_user(from->si_band, &to->si_band); | |
484 | err |= __put_user(from->si_fd, &to->si_fd); | |
485 | break; | |
486 | case __SI_TIMER >> 16: | |
487 | err |= __put_user(from->si_tid, &to->si_tid); | |
488 | err |= __put_user(from->si_overrun, &to->si_overrun); | |
f6744bdd CDJ |
489 | val = (compat_int_t)from->si_int; |
490 | err |= __put_user(val, &to->si_int); | |
f671c45d KM |
491 | break; |
492 | case __SI_RT >> 16: /* Not generated by the kernel as of now. */ | |
493 | case __SI_MESGQ >> 16: | |
494 | err |= __put_user(from->si_uid, &to->si_uid); | |
495 | err |= __put_user(from->si_pid, &to->si_pid); | |
f6744bdd CDJ |
496 | val = (compat_int_t)from->si_int; |
497 | err |= __put_user(val, &to->si_int); | |
f671c45d KM |
498 | break; |
499 | } | |
500 | } | |
501 | return err; | |
502 | } | |
d104f11c KM |
503 | |
504 | asmlinkage long compat_sys_rt_sigqueueinfo(int pid, int sig, | |
505 | struct compat_siginfo __user *uinfo) | |
506 | { | |
507 | siginfo_t info; | |
508 | ||
509 | if (copy_siginfo_from_user32(&info, uinfo)) | |
510 | return -EFAULT; | |
511 | ||
512 | /* Not even root can pretend to send signals from the kernel. | |
513 | Nor can they impersonate a kill(), which adds source info. */ | |
514 | if (info.si_code >= 0) | |
515 | return -EPERM; | |
516 | info.si_signo = sig; | |
517 | ||
518 | /* POSIX.1b doesn't mention process groups. */ | |
519 | return kill_proc_info(sig, &info, pid); | |
520 | } | |
521 |