| 1 | /* |
| 2 | * Based on arch/arm/kernel/signal.c |
| 3 | * |
| 4 | * Copyright (C) 1995-2009 Russell King |
| 5 | * Copyright (C) 2012 ARM Ltd. |
| 6 | * Modified by Will Deacon <will.deacon@arm.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | */ |
| 20 | |
| 21 | #define __SYSCALL_COMPAT |
| 22 | |
| 23 | #include <linux/compat.h> |
| 24 | #include <linux/signal.h> |
| 25 | #include <linux/syscalls.h> |
| 26 | #include <linux/ratelimit.h> |
| 27 | |
| 28 | #include <asm/fpsimd.h> |
| 29 | #include <asm/signal32.h> |
| 30 | #include <asm/uaccess.h> |
| 31 | #include <asm/unistd.h> |
| 32 | |
| 33 | struct compat_sigaction { |
| 34 | compat_uptr_t sa_handler; |
| 35 | compat_ulong_t sa_flags; |
| 36 | compat_uptr_t sa_restorer; |
| 37 | compat_sigset_t sa_mask; |
| 38 | }; |
| 39 | |
| 40 | struct compat_old_sigaction { |
| 41 | compat_uptr_t sa_handler; |
| 42 | compat_old_sigset_t sa_mask; |
| 43 | compat_ulong_t sa_flags; |
| 44 | compat_uptr_t sa_restorer; |
| 45 | }; |
| 46 | |
| 47 | typedef struct compat_sigaltstack { |
| 48 | compat_uptr_t ss_sp; |
| 49 | int ss_flags; |
| 50 | compat_size_t ss_size; |
| 51 | } compat_stack_t; |
| 52 | |
| 53 | struct compat_sigcontext { |
| 54 | /* We always set these two fields to 0 */ |
| 55 | compat_ulong_t trap_no; |
| 56 | compat_ulong_t error_code; |
| 57 | |
| 58 | compat_ulong_t oldmask; |
| 59 | compat_ulong_t arm_r0; |
| 60 | compat_ulong_t arm_r1; |
| 61 | compat_ulong_t arm_r2; |
| 62 | compat_ulong_t arm_r3; |
| 63 | compat_ulong_t arm_r4; |
| 64 | compat_ulong_t arm_r5; |
| 65 | compat_ulong_t arm_r6; |
| 66 | compat_ulong_t arm_r7; |
| 67 | compat_ulong_t arm_r8; |
| 68 | compat_ulong_t arm_r9; |
| 69 | compat_ulong_t arm_r10; |
| 70 | compat_ulong_t arm_fp; |
| 71 | compat_ulong_t arm_ip; |
| 72 | compat_ulong_t arm_sp; |
| 73 | compat_ulong_t arm_lr; |
| 74 | compat_ulong_t arm_pc; |
| 75 | compat_ulong_t arm_cpsr; |
| 76 | compat_ulong_t fault_address; |
| 77 | }; |
| 78 | |
| 79 | struct compat_ucontext { |
| 80 | compat_ulong_t uc_flags; |
| 81 | struct compat_ucontext *uc_link; |
| 82 | compat_stack_t uc_stack; |
| 83 | struct compat_sigcontext uc_mcontext; |
| 84 | compat_sigset_t uc_sigmask; |
| 85 | int __unused[32 - (sizeof (compat_sigset_t) / sizeof (int))]; |
| 86 | compat_ulong_t uc_regspace[128] __attribute__((__aligned__(8))); |
| 87 | }; |
| 88 | |
| 89 | struct compat_vfp_sigframe { |
| 90 | compat_ulong_t magic; |
| 91 | compat_ulong_t size; |
| 92 | struct compat_user_vfp { |
| 93 | compat_u64 fpregs[32]; |
| 94 | compat_ulong_t fpscr; |
| 95 | } ufp; |
| 96 | struct compat_user_vfp_exc { |
| 97 | compat_ulong_t fpexc; |
| 98 | compat_ulong_t fpinst; |
| 99 | compat_ulong_t fpinst2; |
| 100 | } ufp_exc; |
| 101 | } __attribute__((__aligned__(8))); |
| 102 | |
| 103 | #define VFP_MAGIC 0x56465001 |
| 104 | #define VFP_STORAGE_SIZE sizeof(struct compat_vfp_sigframe) |
| 105 | |
| 106 | struct compat_aux_sigframe { |
| 107 | struct compat_vfp_sigframe vfp; |
| 108 | |
| 109 | /* Something that isn't a valid magic number for any coprocessor. */ |
| 110 | unsigned long end_magic; |
| 111 | } __attribute__((__aligned__(8))); |
| 112 | |
| 113 | struct compat_sigframe { |
| 114 | struct compat_ucontext uc; |
| 115 | compat_ulong_t retcode[2]; |
| 116 | }; |
| 117 | |
| 118 | struct compat_rt_sigframe { |
| 119 | struct compat_siginfo info; |
| 120 | struct compat_sigframe sig; |
| 121 | }; |
| 122 | |
| 123 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 124 | |
| 125 | /* |
| 126 | * For ARM syscalls, the syscall number has to be loaded into r7. |
| 127 | * We do not support an OABI userspace. |
| 128 | */ |
| 129 | #define MOV_R7_NR_SIGRETURN (0xe3a07000 | __NR_sigreturn) |
| 130 | #define SVC_SYS_SIGRETURN (0xef000000 | __NR_sigreturn) |
| 131 | #define MOV_R7_NR_RT_SIGRETURN (0xe3a07000 | __NR_rt_sigreturn) |
| 132 | #define SVC_SYS_RT_SIGRETURN (0xef000000 | __NR_rt_sigreturn) |
| 133 | |
| 134 | /* |
| 135 | * For Thumb syscalls, we also pass the syscall number via r7. We therefore |
| 136 | * need two 16-bit instructions. |
| 137 | */ |
| 138 | #define SVC_THUMB_SIGRETURN (((0xdf00 | __NR_sigreturn) << 16) | \ |
| 139 | 0x2700 | __NR_sigreturn) |
| 140 | #define SVC_THUMB_RT_SIGRETURN (((0xdf00 | __NR_rt_sigreturn) << 16) | \ |
| 141 | 0x2700 | __NR_rt_sigreturn) |
| 142 | |
| 143 | const compat_ulong_t aarch32_sigret_code[6] = { |
| 144 | /* |
| 145 | * AArch32 sigreturn code. |
| 146 | * We don't construct an OABI SWI - instead we just set the imm24 field |
| 147 | * to the EABI syscall number so that we create a sane disassembly. |
| 148 | */ |
| 149 | MOV_R7_NR_SIGRETURN, SVC_SYS_SIGRETURN, SVC_THUMB_SIGRETURN, |
| 150 | MOV_R7_NR_RT_SIGRETURN, SVC_SYS_RT_SIGRETURN, SVC_THUMB_RT_SIGRETURN, |
| 151 | }; |
| 152 | |
| 153 | static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set) |
| 154 | { |
| 155 | compat_sigset_t cset; |
| 156 | |
| 157 | cset.sig[0] = set->sig[0] & 0xffffffffull; |
| 158 | cset.sig[1] = set->sig[0] >> 32; |
| 159 | |
| 160 | return copy_to_user(uset, &cset, sizeof(*uset)); |
| 161 | } |
| 162 | |
| 163 | static inline int get_sigset_t(sigset_t *set, |
| 164 | const compat_sigset_t __user *uset) |
| 165 | { |
| 166 | compat_sigset_t s32; |
| 167 | |
| 168 | if (copy_from_user(&s32, uset, sizeof(*uset))) |
| 169 | return -EFAULT; |
| 170 | |
| 171 | set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) |
| 176 | { |
| 177 | int err; |
| 178 | |
| 179 | if (!access_ok(VERIFY_WRITE, to, sizeof(*to))) |
| 180 | return -EFAULT; |
| 181 | |
| 182 | /* If you change siginfo_t structure, please be sure |
| 183 | * this code is fixed accordingly. |
| 184 | * It should never copy any pad contained in the structure |
| 185 | * to avoid security leaks, but must copy the generic |
| 186 | * 3 ints plus the relevant union member. |
| 187 | * This routine must convert siginfo from 64bit to 32bit as well |
| 188 | * at the same time. |
| 189 | */ |
| 190 | err = __put_user(from->si_signo, &to->si_signo); |
| 191 | err |= __put_user(from->si_errno, &to->si_errno); |
| 192 | err |= __put_user((short)from->si_code, &to->si_code); |
| 193 | if (from->si_code < 0) |
| 194 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, |
| 195 | SI_PAD_SIZE); |
| 196 | else switch (from->si_code & __SI_MASK) { |
| 197 | case __SI_KILL: |
| 198 | err |= __put_user(from->si_pid, &to->si_pid); |
| 199 | err |= __put_user(from->si_uid, &to->si_uid); |
| 200 | break; |
| 201 | case __SI_TIMER: |
| 202 | err |= __put_user(from->si_tid, &to->si_tid); |
| 203 | err |= __put_user(from->si_overrun, &to->si_overrun); |
| 204 | err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr, |
| 205 | &to->si_ptr); |
| 206 | break; |
| 207 | case __SI_POLL: |
| 208 | err |= __put_user(from->si_band, &to->si_band); |
| 209 | err |= __put_user(from->si_fd, &to->si_fd); |
| 210 | break; |
| 211 | case __SI_FAULT: |
| 212 | err |= __put_user((compat_uptr_t)(unsigned long)from->si_addr, |
| 213 | &to->si_addr); |
| 214 | #ifdef BUS_MCEERR_AO |
| 215 | /* |
| 216 | * Other callers might not initialize the si_lsb field, |
| 217 | * so check explicitely for the right codes here. |
| 218 | */ |
| 219 | if (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO) |
| 220 | err |= __put_user(from->si_addr_lsb, &to->si_addr_lsb); |
| 221 | #endif |
| 222 | break; |
| 223 | case __SI_CHLD: |
| 224 | err |= __put_user(from->si_pid, &to->si_pid); |
| 225 | err |= __put_user(from->si_uid, &to->si_uid); |
| 226 | err |= __put_user(from->si_status, &to->si_status); |
| 227 | err |= __put_user(from->si_utime, &to->si_utime); |
| 228 | err |= __put_user(from->si_stime, &to->si_stime); |
| 229 | break; |
| 230 | case __SI_RT: /* This is not generated by the kernel as of now. */ |
| 231 | case __SI_MESGQ: /* But this is */ |
| 232 | err |= __put_user(from->si_pid, &to->si_pid); |
| 233 | err |= __put_user(from->si_uid, &to->si_uid); |
| 234 | err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr, &to->si_ptr); |
| 235 | break; |
| 236 | default: /* this is just in case for now ... */ |
| 237 | err |= __put_user(from->si_pid, &to->si_pid); |
| 238 | err |= __put_user(from->si_uid, &to->si_uid); |
| 239 | break; |
| 240 | } |
| 241 | return err; |
| 242 | } |
| 243 | |
| 244 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) |
| 245 | { |
| 246 | memset(to, 0, sizeof *to); |
| 247 | |
| 248 | if (copy_from_user(to, from, __ARCH_SI_PREAMBLE_SIZE) || |
| 249 | copy_from_user(to->_sifields._pad, |
| 250 | from->_sifields._pad, SI_PAD_SIZE)) |
| 251 | return -EFAULT; |
| 252 | |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | /* |
| 257 | * VFP save/restore code. |
| 258 | */ |
| 259 | static int compat_preserve_vfp_context(struct compat_vfp_sigframe __user *frame) |
| 260 | { |
| 261 | struct fpsimd_state *fpsimd = ¤t->thread.fpsimd_state; |
| 262 | compat_ulong_t magic = VFP_MAGIC; |
| 263 | compat_ulong_t size = VFP_STORAGE_SIZE; |
| 264 | compat_ulong_t fpscr, fpexc; |
| 265 | int err = 0; |
| 266 | |
| 267 | /* |
| 268 | * Save the hardware registers to the fpsimd_state structure. |
| 269 | * Note that this also saves V16-31, which aren't visible |
| 270 | * in AArch32. |
| 271 | */ |
| 272 | fpsimd_save_state(fpsimd); |
| 273 | |
| 274 | /* Place structure header on the stack */ |
| 275 | __put_user_error(magic, &frame->magic, err); |
| 276 | __put_user_error(size, &frame->size, err); |
| 277 | |
| 278 | /* |
| 279 | * Now copy the FP registers. Since the registers are packed, |
| 280 | * we can copy the prefix we want (V0-V15) as it is. |
| 281 | * FIXME: Won't work if big endian. |
| 282 | */ |
| 283 | err |= __copy_to_user(&frame->ufp.fpregs, fpsimd->vregs, |
| 284 | sizeof(frame->ufp.fpregs)); |
| 285 | |
| 286 | /* Create an AArch32 fpscr from the fpsr and the fpcr. */ |
| 287 | fpscr = (fpsimd->fpsr & VFP_FPSCR_STAT_MASK) | |
| 288 | (fpsimd->fpcr & VFP_FPSCR_CTRL_MASK); |
| 289 | __put_user_error(fpscr, &frame->ufp.fpscr, err); |
| 290 | |
| 291 | /* |
| 292 | * The exception register aren't available so we fake up a |
| 293 | * basic FPEXC and zero everything else. |
| 294 | */ |
| 295 | fpexc = (1 << 30); |
| 296 | __put_user_error(fpexc, &frame->ufp_exc.fpexc, err); |
| 297 | __put_user_error(0, &frame->ufp_exc.fpinst, err); |
| 298 | __put_user_error(0, &frame->ufp_exc.fpinst2, err); |
| 299 | |
| 300 | return err ? -EFAULT : 0; |
| 301 | } |
| 302 | |
| 303 | static int compat_restore_vfp_context(struct compat_vfp_sigframe __user *frame) |
| 304 | { |
| 305 | struct fpsimd_state fpsimd; |
| 306 | compat_ulong_t magic = VFP_MAGIC; |
| 307 | compat_ulong_t size = VFP_STORAGE_SIZE; |
| 308 | compat_ulong_t fpscr; |
| 309 | int err = 0; |
| 310 | |
| 311 | __get_user_error(magic, &frame->magic, err); |
| 312 | __get_user_error(size, &frame->size, err); |
| 313 | |
| 314 | if (err) |
| 315 | return -EFAULT; |
| 316 | if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE) |
| 317 | return -EINVAL; |
| 318 | |
| 319 | /* |
| 320 | * Copy the FP registers into the start of the fpsimd_state. |
| 321 | * FIXME: Won't work if big endian. |
| 322 | */ |
| 323 | err |= __copy_from_user(fpsimd.vregs, frame->ufp.fpregs, |
| 324 | sizeof(frame->ufp.fpregs)); |
| 325 | |
| 326 | /* Extract the fpsr and the fpcr from the fpscr */ |
| 327 | __get_user_error(fpscr, &frame->ufp.fpscr, err); |
| 328 | fpsimd.fpsr = fpscr & VFP_FPSCR_STAT_MASK; |
| 329 | fpsimd.fpcr = fpscr & VFP_FPSCR_CTRL_MASK; |
| 330 | |
| 331 | /* |
| 332 | * We don't need to touch the exception register, so |
| 333 | * reload the hardware state. |
| 334 | */ |
| 335 | if (!err) { |
| 336 | preempt_disable(); |
| 337 | fpsimd_load_state(&fpsimd); |
| 338 | preempt_enable(); |
| 339 | } |
| 340 | |
| 341 | return err ? -EFAULT : 0; |
| 342 | } |
| 343 | |
| 344 | /* |
| 345 | * atomically swap in the new signal mask, and wait for a signal. |
| 346 | */ |
| 347 | asmlinkage int compat_sys_sigsuspend(int restart, compat_ulong_t oldmask, |
| 348 | compat_old_sigset_t mask) |
| 349 | { |
| 350 | sigset_t blocked; |
| 351 | |
| 352 | siginitset(¤t->blocked, mask); |
| 353 | return sigsuspend(&blocked); |
| 354 | } |
| 355 | |
| 356 | asmlinkage int compat_sys_sigaction(int sig, |
| 357 | const struct compat_old_sigaction __user *act, |
| 358 | struct compat_old_sigaction __user *oact) |
| 359 | { |
| 360 | struct k_sigaction new_ka, old_ka; |
| 361 | int ret; |
| 362 | compat_old_sigset_t mask; |
| 363 | compat_uptr_t handler, restorer; |
| 364 | |
| 365 | if (act) { |
| 366 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || |
| 367 | __get_user(handler, &act->sa_handler) || |
| 368 | __get_user(restorer, &act->sa_restorer) || |
| 369 | __get_user(new_ka.sa.sa_flags, &act->sa_flags) || |
| 370 | __get_user(mask, &act->sa_mask)) |
| 371 | return -EFAULT; |
| 372 | |
| 373 | new_ka.sa.sa_handler = compat_ptr(handler); |
| 374 | new_ka.sa.sa_restorer = compat_ptr(restorer); |
| 375 | siginitset(&new_ka.sa.sa_mask, mask); |
| 376 | } |
| 377 | |
| 378 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 379 | |
| 380 | if (!ret && oact) { |
| 381 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || |
| 382 | __put_user(ptr_to_compat(old_ka.sa.sa_handler), |
| 383 | &oact->sa_handler) || |
| 384 | __put_user(ptr_to_compat(old_ka.sa.sa_restorer), |
| 385 | &oact->sa_restorer) || |
| 386 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || |
| 387 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) |
| 388 | return -EFAULT; |
| 389 | } |
| 390 | |
| 391 | return ret; |
| 392 | } |
| 393 | |
| 394 | asmlinkage int compat_sys_rt_sigaction(int sig, |
| 395 | const struct compat_sigaction __user *act, |
| 396 | struct compat_sigaction __user *oact, |
| 397 | compat_size_t sigsetsize) |
| 398 | { |
| 399 | struct k_sigaction new_ka, old_ka; |
| 400 | int ret; |
| 401 | |
| 402 | /* XXX: Don't preclude handling different sized sigset_t's. */ |
| 403 | if (sigsetsize != sizeof(compat_sigset_t)) |
| 404 | return -EINVAL; |
| 405 | |
| 406 | if (act) { |
| 407 | compat_uptr_t handler, restorer; |
| 408 | |
| 409 | ret = get_user(handler, &act->sa_handler); |
| 410 | new_ka.sa.sa_handler = compat_ptr(handler); |
| 411 | ret |= get_user(restorer, &act->sa_restorer); |
| 412 | new_ka.sa.sa_restorer = compat_ptr(restorer); |
| 413 | ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); |
| 414 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
| 415 | if (ret) |
| 416 | return -EFAULT; |
| 417 | } |
| 418 | |
| 419 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 420 | if (!ret && oact) { |
| 421 | ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler); |
| 422 | ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); |
| 423 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
| 424 | } |
| 425 | return ret; |
| 426 | } |
| 427 | |
| 428 | int compat_do_sigaltstack(compat_uptr_t compat_uss, compat_uptr_t compat_uoss, |
| 429 | compat_ulong_t sp) |
| 430 | { |
| 431 | compat_stack_t __user *newstack = compat_ptr(compat_uss); |
| 432 | compat_stack_t __user *oldstack = compat_ptr(compat_uoss); |
| 433 | compat_uptr_t ss_sp; |
| 434 | int ret; |
| 435 | mm_segment_t old_fs; |
| 436 | stack_t uss, uoss; |
| 437 | |
| 438 | /* Marshall the compat new stack into a stack_t */ |
| 439 | if (newstack) { |
| 440 | if (get_user(ss_sp, &newstack->ss_sp) || |
| 441 | __get_user(uss.ss_flags, &newstack->ss_flags) || |
| 442 | __get_user(uss.ss_size, &newstack->ss_size)) |
| 443 | return -EFAULT; |
| 444 | uss.ss_sp = compat_ptr(ss_sp); |
| 445 | } |
| 446 | |
| 447 | old_fs = get_fs(); |
| 448 | set_fs(KERNEL_DS); |
| 449 | /* The __user pointer casts are valid because of the set_fs() */ |
| 450 | ret = do_sigaltstack( |
| 451 | newstack ? (stack_t __user *) &uss : NULL, |
| 452 | oldstack ? (stack_t __user *) &uoss : NULL, |
| 453 | (unsigned long)sp); |
| 454 | set_fs(old_fs); |
| 455 | |
| 456 | /* Convert the old stack_t into a compat stack. */ |
| 457 | if (!ret && oldstack && |
| 458 | (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) || |
| 459 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || |
| 460 | __put_user(uoss.ss_size, &oldstack->ss_size))) |
| 461 | return -EFAULT; |
| 462 | return ret; |
| 463 | } |
| 464 | |
| 465 | static int compat_restore_sigframe(struct pt_regs *regs, |
| 466 | struct compat_sigframe __user *sf) |
| 467 | { |
| 468 | int err; |
| 469 | sigset_t set; |
| 470 | struct compat_aux_sigframe __user *aux; |
| 471 | |
| 472 | err = get_sigset_t(&set, &sf->uc.uc_sigmask); |
| 473 | if (err == 0) { |
| 474 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 475 | set_current_blocked(&set); |
| 476 | } |
| 477 | |
| 478 | __get_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err); |
| 479 | __get_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err); |
| 480 | __get_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err); |
| 481 | __get_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err); |
| 482 | __get_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err); |
| 483 | __get_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err); |
| 484 | __get_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err); |
| 485 | __get_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err); |
| 486 | __get_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err); |
| 487 | __get_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err); |
| 488 | __get_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err); |
| 489 | __get_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err); |
| 490 | __get_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err); |
| 491 | __get_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err); |
| 492 | __get_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err); |
| 493 | __get_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err); |
| 494 | __get_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err); |
| 495 | |
| 496 | /* |
| 497 | * Avoid compat_sys_sigreturn() restarting. |
| 498 | */ |
| 499 | regs->syscallno = ~0UL; |
| 500 | |
| 501 | err |= !valid_user_regs(®s->user_regs); |
| 502 | |
| 503 | aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace; |
| 504 | if (err == 0) |
| 505 | err |= compat_restore_vfp_context(&aux->vfp); |
| 506 | |
| 507 | return err; |
| 508 | } |
| 509 | |
| 510 | asmlinkage int compat_sys_sigreturn(struct pt_regs *regs) |
| 511 | { |
| 512 | struct compat_sigframe __user *frame; |
| 513 | |
| 514 | /* Always make any pending restarted system calls return -EINTR */ |
| 515 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 516 | |
| 517 | /* |
| 518 | * Since we stacked the signal on a 64-bit boundary, |
| 519 | * then 'sp' should be word aligned here. If it's |
| 520 | * not, then the user is trying to mess with us. |
| 521 | */ |
| 522 | if (regs->compat_sp & 7) |
| 523 | goto badframe; |
| 524 | |
| 525 | frame = (struct compat_sigframe __user *)regs->compat_sp; |
| 526 | |
| 527 | if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) |
| 528 | goto badframe; |
| 529 | |
| 530 | if (compat_restore_sigframe(regs, frame)) |
| 531 | goto badframe; |
| 532 | |
| 533 | return regs->regs[0]; |
| 534 | |
| 535 | badframe: |
| 536 | if (show_unhandled_signals) |
| 537 | pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n", |
| 538 | current->comm, task_pid_nr(current), __func__, |
| 539 | regs->pc, regs->sp); |
| 540 | force_sig(SIGSEGV, current); |
| 541 | return 0; |
| 542 | } |
| 543 | |
| 544 | asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs) |
| 545 | { |
| 546 | struct compat_rt_sigframe __user *frame; |
| 547 | |
| 548 | /* Always make any pending restarted system calls return -EINTR */ |
| 549 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 550 | |
| 551 | /* |
| 552 | * Since we stacked the signal on a 64-bit boundary, |
| 553 | * then 'sp' should be word aligned here. If it's |
| 554 | * not, then the user is trying to mess with us. |
| 555 | */ |
| 556 | if (regs->compat_sp & 7) |
| 557 | goto badframe; |
| 558 | |
| 559 | frame = (struct compat_rt_sigframe __user *)regs->compat_sp; |
| 560 | |
| 561 | if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) |
| 562 | goto badframe; |
| 563 | |
| 564 | if (compat_restore_sigframe(regs, &frame->sig)) |
| 565 | goto badframe; |
| 566 | |
| 567 | if (compat_do_sigaltstack(ptr_to_compat(&frame->sig.uc.uc_stack), |
| 568 | ptr_to_compat((void __user *)NULL), |
| 569 | regs->compat_sp) == -EFAULT) |
| 570 | goto badframe; |
| 571 | |
| 572 | return regs->regs[0]; |
| 573 | |
| 574 | badframe: |
| 575 | if (show_unhandled_signals) |
| 576 | pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n", |
| 577 | current->comm, task_pid_nr(current), __func__, |
| 578 | regs->pc, regs->sp); |
| 579 | force_sig(SIGSEGV, current); |
| 580 | return 0; |
| 581 | } |
| 582 | |
| 583 | static inline void __user *compat_get_sigframe(struct k_sigaction *ka, |
| 584 | struct pt_regs *regs, |
| 585 | int framesize) |
| 586 | { |
| 587 | compat_ulong_t sp = regs->compat_sp; |
| 588 | void __user *frame; |
| 589 | |
| 590 | /* |
| 591 | * This is the X/Open sanctioned signal stack switching. |
| 592 | */ |
| 593 | if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp)) |
| 594 | sp = current->sas_ss_sp + current->sas_ss_size; |
| 595 | |
| 596 | /* |
| 597 | * ATPCS B01 mandates 8-byte alignment |
| 598 | */ |
| 599 | frame = compat_ptr((compat_uptr_t)((sp - framesize) & ~7)); |
| 600 | |
| 601 | /* |
| 602 | * Check that we can actually write to the signal frame. |
| 603 | */ |
| 604 | if (!access_ok(VERIFY_WRITE, frame, framesize)) |
| 605 | frame = NULL; |
| 606 | |
| 607 | return frame; |
| 608 | } |
| 609 | |
| 610 | static int compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka, |
| 611 | compat_ulong_t __user *rc, void __user *frame, |
| 612 | int usig) |
| 613 | { |
| 614 | compat_ulong_t handler = ptr_to_compat(ka->sa.sa_handler); |
| 615 | compat_ulong_t retcode; |
| 616 | compat_ulong_t spsr = regs->pstate & ~PSR_f; |
| 617 | int thumb; |
| 618 | |
| 619 | /* Check if the handler is written for ARM or Thumb */ |
| 620 | thumb = handler & 1; |
| 621 | |
| 622 | if (thumb) { |
| 623 | spsr |= COMPAT_PSR_T_BIT; |
| 624 | spsr &= ~COMPAT_PSR_IT_MASK; |
| 625 | } else { |
| 626 | spsr &= ~COMPAT_PSR_T_BIT; |
| 627 | } |
| 628 | |
| 629 | if (ka->sa.sa_flags & SA_RESTORER) { |
| 630 | retcode = ptr_to_compat(ka->sa.sa_restorer); |
| 631 | } else { |
| 632 | /* Set up sigreturn pointer */ |
| 633 | unsigned int idx = thumb << 1; |
| 634 | |
| 635 | if (ka->sa.sa_flags & SA_SIGINFO) |
| 636 | idx += 3; |
| 637 | |
| 638 | retcode = AARCH32_VECTORS_BASE + |
| 639 | AARCH32_KERN_SIGRET_CODE_OFFSET + |
| 640 | (idx << 2) + thumb; |
| 641 | } |
| 642 | |
| 643 | regs->regs[0] = usig; |
| 644 | regs->compat_sp = ptr_to_compat(frame); |
| 645 | regs->compat_lr = retcode; |
| 646 | regs->pc = handler; |
| 647 | regs->pstate = spsr; |
| 648 | |
| 649 | return 0; |
| 650 | } |
| 651 | |
| 652 | static int compat_setup_sigframe(struct compat_sigframe __user *sf, |
| 653 | struct pt_regs *regs, sigset_t *set) |
| 654 | { |
| 655 | struct compat_aux_sigframe __user *aux; |
| 656 | int err = 0; |
| 657 | |
| 658 | __put_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err); |
| 659 | __put_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err); |
| 660 | __put_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err); |
| 661 | __put_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err); |
| 662 | __put_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err); |
| 663 | __put_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err); |
| 664 | __put_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err); |
| 665 | __put_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err); |
| 666 | __put_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err); |
| 667 | __put_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err); |
| 668 | __put_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err); |
| 669 | __put_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err); |
| 670 | __put_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err); |
| 671 | __put_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err); |
| 672 | __put_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err); |
| 673 | __put_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err); |
| 674 | __put_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err); |
| 675 | |
| 676 | __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.trap_no, err); |
| 677 | __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.error_code, err); |
| 678 | __put_user_error(current->thread.fault_address, &sf->uc.uc_mcontext.fault_address, err); |
| 679 | __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err); |
| 680 | |
| 681 | err |= put_sigset_t(&sf->uc.uc_sigmask, set); |
| 682 | |
| 683 | aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace; |
| 684 | |
| 685 | if (err == 0) |
| 686 | err |= compat_preserve_vfp_context(&aux->vfp); |
| 687 | __put_user_error(0, &aux->end_magic, err); |
| 688 | |
| 689 | return err; |
| 690 | } |
| 691 | |
| 692 | /* |
| 693 | * 32-bit signal handling routines called from signal.c |
| 694 | */ |
| 695 | int compat_setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info, |
| 696 | sigset_t *set, struct pt_regs *regs) |
| 697 | { |
| 698 | struct compat_rt_sigframe __user *frame; |
| 699 | compat_stack_t stack; |
| 700 | int err = 0; |
| 701 | |
| 702 | frame = compat_get_sigframe(ka, regs, sizeof(*frame)); |
| 703 | |
| 704 | if (!frame) |
| 705 | return 1; |
| 706 | |
| 707 | err |= copy_siginfo_to_user32(&frame->info, info); |
| 708 | |
| 709 | __put_user_error(0, &frame->sig.uc.uc_flags, err); |
| 710 | __put_user_error(NULL, &frame->sig.uc.uc_link, err); |
| 711 | |
| 712 | memset(&stack, 0, sizeof(stack)); |
| 713 | stack.ss_sp = (compat_uptr_t)current->sas_ss_sp; |
| 714 | stack.ss_flags = sas_ss_flags(regs->compat_sp); |
| 715 | stack.ss_size = current->sas_ss_size; |
| 716 | err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack)); |
| 717 | |
| 718 | err |= compat_setup_sigframe(&frame->sig, regs, set); |
| 719 | if (err == 0) |
| 720 | err = compat_setup_return(regs, ka, frame->sig.retcode, frame, |
| 721 | usig); |
| 722 | |
| 723 | if (err == 0) { |
| 724 | regs->regs[1] = (compat_ulong_t)(unsigned long)&frame->info; |
| 725 | regs->regs[2] = (compat_ulong_t)(unsigned long)&frame->sig.uc; |
| 726 | } |
| 727 | |
| 728 | return err; |
| 729 | } |
| 730 | |
| 731 | int compat_setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, |
| 732 | struct pt_regs *regs) |
| 733 | { |
| 734 | struct compat_sigframe __user *frame; |
| 735 | int err = 0; |
| 736 | |
| 737 | frame = compat_get_sigframe(ka, regs, sizeof(*frame)); |
| 738 | |
| 739 | if (!frame) |
| 740 | return 1; |
| 741 | |
| 742 | __put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err); |
| 743 | |
| 744 | err |= compat_setup_sigframe(frame, regs, set); |
| 745 | if (err == 0) |
| 746 | err = compat_setup_return(regs, ka, frame->retcode, frame, usig); |
| 747 | |
| 748 | return err; |
| 749 | } |
| 750 | |
| 751 | /* |
| 752 | * RT signals don't have generic compat wrappers. |
| 753 | * See arch/powerpc/kernel/signal_32.c |
| 754 | */ |
| 755 | asmlinkage int compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set, |
| 756 | compat_sigset_t __user *oset, |
| 757 | compat_size_t sigsetsize) |
| 758 | { |
| 759 | sigset_t s; |
| 760 | sigset_t __user *up; |
| 761 | int ret; |
| 762 | mm_segment_t old_fs = get_fs(); |
| 763 | |
| 764 | if (set) { |
| 765 | if (get_sigset_t(&s, set)) |
| 766 | return -EFAULT; |
| 767 | } |
| 768 | |
| 769 | set_fs(KERNEL_DS); |
| 770 | /* This is valid because of the set_fs() */ |
| 771 | up = (sigset_t __user *) &s; |
| 772 | ret = sys_rt_sigprocmask(how, set ? up : NULL, oset ? up : NULL, |
| 773 | sigsetsize); |
| 774 | set_fs(old_fs); |
| 775 | if (ret) |
| 776 | return ret; |
| 777 | if (oset) { |
| 778 | if (put_sigset_t(oset, &s)) |
| 779 | return -EFAULT; |
| 780 | } |
| 781 | return 0; |
| 782 | } |
| 783 | |
| 784 | asmlinkage int compat_sys_rt_sigpending(compat_sigset_t __user *set, |
| 785 | compat_size_t sigsetsize) |
| 786 | { |
| 787 | sigset_t s; |
| 788 | int ret; |
| 789 | mm_segment_t old_fs = get_fs(); |
| 790 | |
| 791 | set_fs(KERNEL_DS); |
| 792 | /* The __user pointer cast is valid because of the set_fs() */ |
| 793 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); |
| 794 | set_fs(old_fs); |
| 795 | if (!ret) { |
| 796 | if (put_sigset_t(set, &s)) |
| 797 | return -EFAULT; |
| 798 | } |
| 799 | return ret; |
| 800 | } |
| 801 | |
| 802 | asmlinkage int compat_sys_rt_sigqueueinfo(int pid, int sig, |
| 803 | compat_siginfo_t __user *uinfo) |
| 804 | { |
| 805 | siginfo_t info; |
| 806 | int ret; |
| 807 | mm_segment_t old_fs = get_fs(); |
| 808 | |
| 809 | ret = copy_siginfo_from_user32(&info, uinfo); |
| 810 | if (unlikely(ret)) |
| 811 | return ret; |
| 812 | |
| 813 | set_fs (KERNEL_DS); |
| 814 | /* The __user pointer cast is valid because of the set_fs() */ |
| 815 | ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *) &info); |
| 816 | set_fs (old_fs); |
| 817 | return ret; |
| 818 | } |
| 819 | |
| 820 | void compat_setup_restart_syscall(struct pt_regs *regs) |
| 821 | { |
| 822 | regs->regs[7] = __NR_restart_syscall; |
| 823 | } |