1 // SPDX-License-Identifier: GPL-2.0-or-later 2 3 /* 4 * PARISC specific syscalls 5 * 6 * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org> 7 * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org> 8 * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org> 9 * Copyright (C) 1999-2020 Helge Deller <deller@gmx.de> 10 */ 11 12 #include <linux/uaccess.h> 13 #include <asm/elf.h> 14 #include <linux/file.h> 15 #include <linux/fs.h> 16 #include <linux/linkage.h> 17 #include <linux/mm.h> 18 #include <linux/mman.h> 19 #include <linux/sched/signal.h> 20 #include <linux/sched/mm.h> 21 #include <linux/shm.h> 22 #include <linux/syscalls.h> 23 #include <linux/utsname.h> 24 #include <linux/personality.h> 25 #include <linux/random.h> 26 #include <linux/compat.h> 27 28 /* we construct an artificial offset for the mapping based on the physical 29 * address of the kernel mapping variable */ 30 #define GET_LAST_MMAP(filp) \ 31 (filp ? ((unsigned long) filp->f_mapping) >> 8 : 0UL) 32 #define SET_LAST_MMAP(filp, val) \ 33 { /* nothing */ } 34 35 static int get_offset(unsigned int last_mmap) 36 { 37 return (last_mmap & (SHM_COLOUR-1)) >> PAGE_SHIFT; 38 } 39 40 static unsigned long shared_align_offset(unsigned int last_mmap, 41 unsigned long pgoff) 42 { 43 return (get_offset(last_mmap) + pgoff) << PAGE_SHIFT; 44 } 45 46 static inline unsigned long COLOR_ALIGN(unsigned long addr, 47 unsigned int last_mmap, unsigned long pgoff) 48 { 49 unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1); 50 unsigned long off = (SHM_COLOUR-1) & 51 (shared_align_offset(last_mmap, pgoff) << PAGE_SHIFT); 52 53 return base + off; 54 } 55 56 57 #define STACK_SIZE_DEFAULT (USER_WIDE_MODE \ 58 ? (1 << 30) /* 1 GB */ \ 59 : (CONFIG_STACK_MAX_DEFAULT_SIZE_MB*1024*1024)) 60 61 unsigned long calc_max_stack_size(unsigned long stack_max) 62 { 63 #ifdef CONFIG_COMPAT 64 if (!USER_WIDE_MODE && (stack_max == COMPAT_RLIM_INFINITY)) 65 stack_max = STACK_SIZE_DEFAULT; 66 else 67 #endif 68 if (stack_max == RLIM_INFINITY) 69 stack_max = STACK_SIZE_DEFAULT; 70 71 return stack_max; 72 } 73 74 75 /* 76 * Top of mmap area (just below the process stack). 77 */ 78 79 /* 80 * When called from arch_get_unmapped_area(), rlim_stack will be NULL, 81 * indicating that "current" should be used instead of a passed-in 82 * value from the exec bprm as done with arch_pick_mmap_layout(). 83 */ 84 static unsigned long mmap_upper_limit(struct rlimit *rlim_stack) 85 { 86 unsigned long stack_base; 87 88 /* Limit stack size - see setup_arg_pages() in fs/exec.c */ 89 stack_base = rlim_stack ? rlim_stack->rlim_max 90 : rlimit_max(RLIMIT_STACK); 91 92 stack_base = calc_max_stack_size(stack_base); 93 94 /* Add space for stack randomization. */ 95 if (current->flags & PF_RANDOMIZE) 96 stack_base += (STACK_RND_MASK << PAGE_SHIFT); 97 98 return PAGE_ALIGN(STACK_TOP - stack_base); 99 } 100 101 102 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 103 unsigned long len, unsigned long pgoff, unsigned long flags) 104 { 105 struct mm_struct *mm = current->mm; 106 struct vm_area_struct *vma, *prev; 107 unsigned long task_size = TASK_SIZE; 108 int do_color_align, last_mmap; 109 struct vm_unmapped_area_info info; 110 111 if (len > task_size) 112 return -ENOMEM; 113 114 do_color_align = 0; 115 if (filp || (flags & MAP_SHARED)) 116 do_color_align = 1; 117 last_mmap = GET_LAST_MMAP(filp); 118 119 if (flags & MAP_FIXED) { 120 if ((flags & MAP_SHARED) && last_mmap && 121 (addr - shared_align_offset(last_mmap, pgoff)) 122 & (SHM_COLOUR - 1)) 123 return -EINVAL; 124 goto found_addr; 125 } 126 127 if (addr) { 128 if (do_color_align && last_mmap) 129 addr = COLOR_ALIGN(addr, last_mmap, pgoff); 130 else 131 addr = PAGE_ALIGN(addr); 132 133 vma = find_vma_prev(mm, addr, &prev); 134 if (task_size - len >= addr && 135 (!vma || addr + len <= vm_start_gap(vma)) && 136 (!prev || addr >= vm_end_gap(prev))) 137 goto found_addr; 138 } 139 140 info.flags = 0; 141 info.length = len; 142 info.low_limit = mm->mmap_legacy_base; 143 info.high_limit = mmap_upper_limit(NULL); 144 info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; 145 info.align_offset = shared_align_offset(last_mmap, pgoff); 146 addr = vm_unmapped_area(&info); 147 148 found_addr: 149 if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) 150 SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); 151 152 return addr; 153 } 154 155 unsigned long 156 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, 157 const unsigned long len, const unsigned long pgoff, 158 const unsigned long flags) 159 { 160 struct vm_area_struct *vma, *prev; 161 struct mm_struct *mm = current->mm; 162 unsigned long addr = addr0; 163 int do_color_align, last_mmap; 164 struct vm_unmapped_area_info info; 165 166 /* requested length too big for entire address space */ 167 if (len > TASK_SIZE) 168 return -ENOMEM; 169 170 do_color_align = 0; 171 if (filp || (flags & MAP_SHARED)) 172 do_color_align = 1; 173 last_mmap = GET_LAST_MMAP(filp); 174 175 if (flags & MAP_FIXED) { 176 if ((flags & MAP_SHARED) && last_mmap && 177 (addr - shared_align_offset(last_mmap, pgoff)) 178 & (SHM_COLOUR - 1)) 179 return -EINVAL; 180 goto found_addr; 181 } 182 183 /* requesting a specific address */ 184 if (addr) { 185 if (do_color_align && last_mmap) 186 addr = COLOR_ALIGN(addr, last_mmap, pgoff); 187 else 188 addr = PAGE_ALIGN(addr); 189 190 vma = find_vma_prev(mm, addr, &prev); 191 if (TASK_SIZE - len >= addr && 192 (!vma || addr + len <= vm_start_gap(vma)) && 193 (!prev || addr >= vm_end_gap(prev))) 194 goto found_addr; 195 } 196 197 info.flags = VM_UNMAPPED_AREA_TOPDOWN; 198 info.length = len; 199 info.low_limit = PAGE_SIZE; 200 info.high_limit = mm->mmap_base; 201 info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; 202 info.align_offset = shared_align_offset(last_mmap, pgoff); 203 addr = vm_unmapped_area(&info); 204 if (!(addr & ~PAGE_MASK)) 205 goto found_addr; 206 VM_BUG_ON(addr != -ENOMEM); 207 208 /* 209 * A failed mmap() very likely causes application failure, 210 * so fall back to the bottom-up function here. This scenario 211 * can happen with large stack limits and large mmap() 212 * allocations. 213 */ 214 return arch_get_unmapped_area(filp, addr0, len, pgoff, flags); 215 216 found_addr: 217 if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) 218 SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); 219 220 return addr; 221 } 222 223 static int mmap_is_legacy(void) 224 { 225 if (current->personality & ADDR_COMPAT_LAYOUT) 226 return 1; 227 228 /* parisc stack always grows up - so a unlimited stack should 229 * not be an indicator to use the legacy memory layout. 230 * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY) 231 * return 1; 232 */ 233 234 return sysctl_legacy_va_layout; 235 } 236 237 static unsigned long mmap_rnd(void) 238 { 239 unsigned long rnd = 0; 240 241 if (current->flags & PF_RANDOMIZE) 242 rnd = get_random_int() & MMAP_RND_MASK; 243 244 return rnd << PAGE_SHIFT; 245 } 246 247 unsigned long arch_mmap_rnd(void) 248 { 249 return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT; 250 } 251 252 static unsigned long mmap_legacy_base(void) 253 { 254 return TASK_UNMAPPED_BASE + mmap_rnd(); 255 } 256 257 /* 258 * This function, called very early during the creation of a new 259 * process VM image, sets up which VM layout function to use: 260 */ 261 void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) 262 { 263 mm->mmap_legacy_base = mmap_legacy_base(); 264 mm->mmap_base = mmap_upper_limit(rlim_stack); 265 266 if (mmap_is_legacy()) { 267 mm->mmap_base = mm->mmap_legacy_base; 268 mm->get_unmapped_area = arch_get_unmapped_area; 269 } else { 270 mm->get_unmapped_area = arch_get_unmapped_area_topdown; 271 } 272 } 273 274 275 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, 276 unsigned long prot, unsigned long flags, unsigned long fd, 277 unsigned long pgoff) 278 { 279 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 280 we have. */ 281 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 282 pgoff >> (PAGE_SHIFT - 12)); 283 } 284 285 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, 286 unsigned long prot, unsigned long flags, unsigned long fd, 287 unsigned long offset) 288 { 289 if (!(offset & ~PAGE_MASK)) { 290 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 291 offset >> PAGE_SHIFT); 292 } else { 293 return -EINVAL; 294 } 295 } 296 297 /* Fucking broken ABI */ 298 299 #ifdef CONFIG_64BIT 300 asmlinkage long parisc_truncate64(const char __user * path, 301 unsigned int high, unsigned int low) 302 { 303 return ksys_truncate(path, (long)high << 32 | low); 304 } 305 306 asmlinkage long parisc_ftruncate64(unsigned int fd, 307 unsigned int high, unsigned int low) 308 { 309 return ksys_ftruncate(fd, (long)high << 32 | low); 310 } 311 312 /* stubs for the benefit of the syscall_table since truncate64 and truncate 313 * are identical on LP64 */ 314 asmlinkage long sys_truncate64(const char __user * path, unsigned long length) 315 { 316 return ksys_truncate(path, length); 317 } 318 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) 319 { 320 return ksys_ftruncate(fd, length); 321 } 322 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) 323 { 324 return sys_fcntl(fd, cmd, arg); 325 } 326 #else 327 328 asmlinkage long parisc_truncate64(const char __user * path, 329 unsigned int high, unsigned int low) 330 { 331 return ksys_truncate(path, (loff_t)high << 32 | low); 332 } 333 334 asmlinkage long parisc_ftruncate64(unsigned int fd, 335 unsigned int high, unsigned int low) 336 { 337 return sys_ftruncate64(fd, (loff_t)high << 32 | low); 338 } 339 #endif 340 341 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, 342 unsigned int high, unsigned int low) 343 { 344 return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low); 345 } 346 347 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, 348 size_t count, unsigned int high, unsigned int low) 349 { 350 return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); 351 } 352 353 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, 354 size_t count) 355 { 356 return ksys_readahead(fd, (loff_t)high << 32 | low, count); 357 } 358 359 asmlinkage long parisc_fadvise64_64(int fd, 360 unsigned int high_off, unsigned int low_off, 361 unsigned int high_len, unsigned int low_len, int advice) 362 { 363 return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, 364 (loff_t)high_len << 32 | low_len, advice); 365 } 366 367 asmlinkage long parisc_sync_file_range(int fd, 368 u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes, 369 unsigned int flags) 370 { 371 return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off, 372 (loff_t)hi_nbytes << 32 | lo_nbytes, flags); 373 } 374 375 asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo, 376 u32 lenhi, u32 lenlo) 377 { 378 return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo, 379 ((u64)lenhi << 32) | lenlo); 380 } 381 382 long parisc_personality(unsigned long personality) 383 { 384 long err; 385 386 if (personality(current->personality) == PER_LINUX32 387 && personality(personality) == PER_LINUX) 388 personality = (personality & ~PER_MASK) | PER_LINUX32; 389 390 err = sys_personality(personality); 391 if (personality(err) == PER_LINUX32) 392 err = (err & ~PER_MASK) | PER_LINUX; 393 394 return err; 395 } 396 397 /* 398 * Up to kernel v5.9 we defined O_NONBLOCK as 000200004, 399 * since then O_NONBLOCK is defined as 000200000. 400 * 401 * The following wrapper functions mask out the old 402 * O_NDELAY bit from calls which use O_NONBLOCK. 403 * 404 * XXX: Remove those in year 2022 (or later)? 405 */ 406 407 #define O_NONBLOCK_OLD 000200004 408 #define O_NONBLOCK_MASK_OUT (O_NONBLOCK_OLD & ~O_NONBLOCK) 409 410 static int FIX_O_NONBLOCK(int flags) 411 { 412 if (flags & O_NONBLOCK_MASK_OUT) { 413 struct task_struct *tsk = current; 414 pr_warn_once("%s(%d) uses a deprecated O_NONBLOCK value.\n", 415 tsk->comm, tsk->pid); 416 } 417 return flags & ~O_NONBLOCK_MASK_OUT; 418 } 419 420 asmlinkage long parisc_timerfd_create(int clockid, int flags) 421 { 422 flags = FIX_O_NONBLOCK(flags); 423 return sys_timerfd_create(clockid, flags); 424 } 425 426 asmlinkage long parisc_signalfd4(int ufd, sigset_t __user *user_mask, 427 size_t sizemask, int flags) 428 { 429 flags = FIX_O_NONBLOCK(flags); 430 return sys_signalfd4(ufd, user_mask, sizemask, flags); 431 } 432 433 #ifdef CONFIG_COMPAT 434 asmlinkage long parisc_compat_signalfd4(int ufd, 435 compat_sigset_t __user *user_mask, 436 compat_size_t sizemask, int flags) 437 { 438 flags = FIX_O_NONBLOCK(flags); 439 return compat_sys_signalfd4(ufd, user_mask, sizemask, flags); 440 } 441 #endif 442 443 asmlinkage long parisc_eventfd2(unsigned int count, int flags) 444 { 445 flags = FIX_O_NONBLOCK(flags); 446 return sys_eventfd2(count, flags); 447 } 448 449 asmlinkage long parisc_userfaultfd(int flags) 450 { 451 flags = FIX_O_NONBLOCK(flags); 452 return sys_userfaultfd(flags); 453 } 454 455 asmlinkage long parisc_pipe2(int __user *fildes, int flags) 456 { 457 flags = FIX_O_NONBLOCK(flags); 458 return sys_pipe2(fildes, flags); 459 } 460 461 asmlinkage long parisc_inotify_init1(int flags) 462 { 463 flags = FIX_O_NONBLOCK(flags); 464 return sys_inotify_init1(flags); 465 } 466