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 /* 29 * Construct an artificial page offset for the mapping based on the physical 30 * address of the kernel file mapping variable. 31 */ 32 #define GET_FILP_PGOFF(filp) \ 33 (filp ? (((unsigned long) filp->f_mapping) >> 8) \ 34 & ((SHM_COLOUR-1) >> PAGE_SHIFT) : 0UL) 35 36 static unsigned long shared_align_offset(unsigned long filp_pgoff, 37 unsigned long pgoff) 38 { 39 return (filp_pgoff + pgoff) << PAGE_SHIFT; 40 } 41 42 static inline unsigned long COLOR_ALIGN(unsigned long addr, 43 unsigned long filp_pgoff, unsigned long pgoff) 44 { 45 unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1); 46 unsigned long off = (SHM_COLOUR-1) & 47 shared_align_offset(filp_pgoff, pgoff); 48 return base + off; 49 } 50 51 52 #define STACK_SIZE_DEFAULT (USER_WIDE_MODE \ 53 ? (1 << 30) /* 1 GB */ \ 54 : (CONFIG_STACK_MAX_DEFAULT_SIZE_MB*1024*1024)) 55 56 unsigned long calc_max_stack_size(unsigned long stack_max) 57 { 58 #ifdef CONFIG_COMPAT 59 if (!USER_WIDE_MODE && (stack_max == COMPAT_RLIM_INFINITY)) 60 stack_max = STACK_SIZE_DEFAULT; 61 else 62 #endif 63 if (stack_max == RLIM_INFINITY) 64 stack_max = STACK_SIZE_DEFAULT; 65 66 return stack_max; 67 } 68 69 70 /* 71 * Top of mmap area (just below the process stack). 72 */ 73 74 /* 75 * When called from arch_get_unmapped_area(), rlim_stack will be NULL, 76 * indicating that "current" should be used instead of a passed-in 77 * value from the exec bprm as done with arch_pick_mmap_layout(). 78 */ 79 static unsigned long mmap_upper_limit(struct rlimit *rlim_stack) 80 { 81 unsigned long stack_base; 82 83 /* Limit stack size - see setup_arg_pages() in fs/exec.c */ 84 stack_base = rlim_stack ? rlim_stack->rlim_max 85 : rlimit_max(RLIMIT_STACK); 86 87 stack_base = calc_max_stack_size(stack_base); 88 89 /* Add space for stack randomization. */ 90 if (current->flags & PF_RANDOMIZE) 91 stack_base += (STACK_RND_MASK << PAGE_SHIFT); 92 93 return PAGE_ALIGN(STACK_TOP - stack_base); 94 } 95 96 enum mmap_allocation_direction {UP, DOWN}; 97 98 static unsigned long arch_get_unmapped_area_common(struct file *filp, 99 unsigned long addr, unsigned long len, unsigned long pgoff, 100 unsigned long flags, enum mmap_allocation_direction dir) 101 { 102 struct mm_struct *mm = current->mm; 103 struct vm_area_struct *vma, *prev; 104 unsigned long filp_pgoff; 105 int do_color_align; 106 struct vm_unmapped_area_info info; 107 108 if (unlikely(len > TASK_SIZE)) 109 return -ENOMEM; 110 111 do_color_align = 0; 112 if (filp || (flags & MAP_SHARED)) 113 do_color_align = 1; 114 filp_pgoff = GET_FILP_PGOFF(filp); 115 116 if (flags & MAP_FIXED) { 117 /* Even MAP_FIXED mappings must reside within TASK_SIZE */ 118 if (TASK_SIZE - len < addr) 119 return -EINVAL; 120 121 if ((flags & MAP_SHARED) && filp && 122 (addr - shared_align_offset(filp_pgoff, pgoff)) 123 & (SHM_COLOUR - 1)) 124 return -EINVAL; 125 return addr; 126 } 127 128 if (addr) { 129 if (do_color_align) 130 addr = COLOR_ALIGN(addr, filp_pgoff, pgoff); 131 else 132 addr = PAGE_ALIGN(addr); 133 134 vma = find_vma_prev(mm, addr, &prev); 135 if (TASK_SIZE - len >= addr && 136 (!vma || addr + len <= vm_start_gap(vma)) && 137 (!prev || addr >= vm_end_gap(prev))) 138 return addr; 139 } 140 141 info.length = len; 142 info.align_mask = do_color_align ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; 143 info.align_offset = shared_align_offset(filp_pgoff, pgoff); 144 145 if (dir == DOWN) { 146 info.flags = VM_UNMAPPED_AREA_TOPDOWN; 147 info.low_limit = PAGE_SIZE; 148 info.high_limit = mm->mmap_base; 149 addr = vm_unmapped_area(&info); 150 if (!(addr & ~PAGE_MASK)) 151 return addr; 152 VM_BUG_ON(addr != -ENOMEM); 153 154 /* 155 * A failed mmap() very likely causes application failure, 156 * so fall back to the bottom-up function here. This scenario 157 * can happen with large stack limits and large mmap() 158 * allocations. 159 */ 160 } 161 162 info.flags = 0; 163 info.low_limit = mm->mmap_legacy_base; 164 info.high_limit = mmap_upper_limit(NULL); 165 return vm_unmapped_area(&info); 166 } 167 168 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 169 unsigned long len, unsigned long pgoff, unsigned long flags) 170 { 171 return arch_get_unmapped_area_common(filp, 172 addr, len, pgoff, flags, UP); 173 } 174 175 unsigned long arch_get_unmapped_area_topdown(struct file *filp, 176 unsigned long addr, unsigned long len, unsigned long pgoff, 177 unsigned long flags) 178 { 179 return arch_get_unmapped_area_common(filp, 180 addr, len, pgoff, flags, DOWN); 181 } 182 183 static int mmap_is_legacy(void) 184 { 185 if (current->personality & ADDR_COMPAT_LAYOUT) 186 return 1; 187 188 /* parisc stack always grows up - so a unlimited stack should 189 * not be an indicator to use the legacy memory layout. 190 * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY) 191 * return 1; 192 */ 193 194 return sysctl_legacy_va_layout; 195 } 196 197 static unsigned long mmap_rnd(void) 198 { 199 unsigned long rnd = 0; 200 201 if (current->flags & PF_RANDOMIZE) 202 rnd = get_random_u32() & MMAP_RND_MASK; 203 204 return rnd << PAGE_SHIFT; 205 } 206 207 unsigned long arch_mmap_rnd(void) 208 { 209 return (get_random_u32() & MMAP_RND_MASK) << PAGE_SHIFT; 210 } 211 212 static unsigned long mmap_legacy_base(void) 213 { 214 return TASK_UNMAPPED_BASE + mmap_rnd(); 215 } 216 217 /* 218 * This function, called very early during the creation of a new 219 * process VM image, sets up which VM layout function to use: 220 */ 221 void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) 222 { 223 mm->mmap_legacy_base = mmap_legacy_base(); 224 mm->mmap_base = mmap_upper_limit(rlim_stack); 225 226 if (mmap_is_legacy()) { 227 mm->mmap_base = mm->mmap_legacy_base; 228 mm->get_unmapped_area = arch_get_unmapped_area; 229 } else { 230 mm->get_unmapped_area = arch_get_unmapped_area_topdown; 231 } 232 } 233 234 235 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, 236 unsigned long prot, unsigned long flags, unsigned long fd, 237 unsigned long pgoff) 238 { 239 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 240 we have. */ 241 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 242 pgoff >> (PAGE_SHIFT - 12)); 243 } 244 245 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, 246 unsigned long prot, unsigned long flags, unsigned long fd, 247 unsigned long offset) 248 { 249 if (!(offset & ~PAGE_MASK)) { 250 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 251 offset >> PAGE_SHIFT); 252 } else { 253 return -EINVAL; 254 } 255 } 256 257 /* Fucking broken ABI */ 258 259 #ifdef CONFIG_64BIT 260 asmlinkage long parisc_truncate64(const char __user * path, 261 unsigned int high, unsigned int low) 262 { 263 return ksys_truncate(path, (long)high << 32 | low); 264 } 265 266 asmlinkage long parisc_ftruncate64(unsigned int fd, 267 unsigned int high, unsigned int low) 268 { 269 return ksys_ftruncate(fd, (long)high << 32 | low); 270 } 271 272 /* stubs for the benefit of the syscall_table since truncate64 and truncate 273 * are identical on LP64 */ 274 asmlinkage long sys_truncate64(const char __user * path, unsigned long length) 275 { 276 return ksys_truncate(path, length); 277 } 278 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) 279 { 280 return ksys_ftruncate(fd, length); 281 } 282 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) 283 { 284 return sys_fcntl(fd, cmd, arg); 285 } 286 #else 287 288 asmlinkage long parisc_truncate64(const char __user * path, 289 unsigned int high, unsigned int low) 290 { 291 return ksys_truncate(path, (loff_t)high << 32 | low); 292 } 293 294 asmlinkage long parisc_ftruncate64(unsigned int fd, 295 unsigned int high, unsigned int low) 296 { 297 return sys_ftruncate64(fd, (loff_t)high << 32 | low); 298 } 299 #endif 300 301 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, 302 unsigned int high, unsigned int low) 303 { 304 return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low); 305 } 306 307 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, 308 size_t count, unsigned int high, unsigned int low) 309 { 310 return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); 311 } 312 313 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, 314 size_t count) 315 { 316 return ksys_readahead(fd, (loff_t)high << 32 | low, count); 317 } 318 319 asmlinkage long parisc_fadvise64_64(int fd, 320 unsigned int high_off, unsigned int low_off, 321 unsigned int high_len, unsigned int low_len, int advice) 322 { 323 return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, 324 (loff_t)high_len << 32 | low_len, advice); 325 } 326 327 asmlinkage long parisc_sync_file_range(int fd, 328 u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes, 329 unsigned int flags) 330 { 331 return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off, 332 (loff_t)hi_nbytes << 32 | lo_nbytes, flags); 333 } 334 335 asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo, 336 u32 lenhi, u32 lenlo) 337 { 338 return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo, 339 ((u64)lenhi << 32) | lenlo); 340 } 341 342 long parisc_personality(unsigned long personality) 343 { 344 long err; 345 346 if (personality(current->personality) == PER_LINUX32 347 && personality(personality) == PER_LINUX) 348 personality = (personality & ~PER_MASK) | PER_LINUX32; 349 350 err = sys_personality(personality); 351 if (personality(err) == PER_LINUX32) 352 err = (err & ~PER_MASK) | PER_LINUX; 353 354 return err; 355 } 356 357 /* 358 * Up to kernel v5.9 we defined O_NONBLOCK as 000200004, 359 * since then O_NONBLOCK is defined as 000200000. 360 * 361 * The following wrapper functions mask out the old 362 * O_NDELAY bit from calls which use O_NONBLOCK. 363 * 364 * XXX: Remove those in year 2022 (or later)? 365 */ 366 367 #define O_NONBLOCK_OLD 000200004 368 #define O_NONBLOCK_MASK_OUT (O_NONBLOCK_OLD & ~O_NONBLOCK) 369 370 static int FIX_O_NONBLOCK(int flags) 371 { 372 if ((flags & O_NONBLOCK_MASK_OUT) && 373 !test_thread_flag(TIF_NONBLOCK_WARNING)) { 374 set_thread_flag(TIF_NONBLOCK_WARNING); 375 pr_warn("%s(%d) uses a deprecated O_NONBLOCK value." 376 " Please recompile with newer glibc.\n", 377 current->comm, current->pid); 378 } 379 return flags & ~O_NONBLOCK_MASK_OUT; 380 } 381 382 asmlinkage long parisc_timerfd_create(int clockid, int flags) 383 { 384 flags = FIX_O_NONBLOCK(flags); 385 return sys_timerfd_create(clockid, flags); 386 } 387 388 asmlinkage long parisc_signalfd4(int ufd, sigset_t __user *user_mask, 389 size_t sizemask, int flags) 390 { 391 flags = FIX_O_NONBLOCK(flags); 392 return sys_signalfd4(ufd, user_mask, sizemask, flags); 393 } 394 395 #ifdef CONFIG_COMPAT 396 asmlinkage long parisc_compat_signalfd4(int ufd, 397 compat_sigset_t __user *user_mask, 398 compat_size_t sizemask, int flags) 399 { 400 flags = FIX_O_NONBLOCK(flags); 401 return compat_sys_signalfd4(ufd, user_mask, sizemask, flags); 402 } 403 #endif 404 405 asmlinkage long parisc_eventfd2(unsigned int count, int flags) 406 { 407 flags = FIX_O_NONBLOCK(flags); 408 return sys_eventfd2(count, flags); 409 } 410 411 asmlinkage long parisc_userfaultfd(int flags) 412 { 413 flags = FIX_O_NONBLOCK(flags); 414 return sys_userfaultfd(flags); 415 } 416 417 asmlinkage long parisc_pipe2(int __user *fildes, int flags) 418 { 419 flags = FIX_O_NONBLOCK(flags); 420 return sys_pipe2(fildes, flags); 421 } 422 423 asmlinkage long parisc_inotify_init1(int flags) 424 { 425 flags = FIX_O_NONBLOCK(flags); 426 return sys_inotify_init1(flags); 427 } 428 429 /* 430 * madvise() wrapper 431 * 432 * Up to kernel v6.1 parisc has different values than all other 433 * platforms for the MADV_xxx flags listed below. 434 * To keep binary compatibility with existing userspace programs 435 * translate the former values to the new values. 436 * 437 * XXX: Remove this wrapper in year 2025 (or later) 438 */ 439 440 asmlinkage notrace long parisc_madvise(unsigned long start, size_t len_in, int behavior) 441 { 442 switch (behavior) { 443 case 65: behavior = MADV_MERGEABLE; break; 444 case 66: behavior = MADV_UNMERGEABLE; break; 445 case 67: behavior = MADV_HUGEPAGE; break; 446 case 68: behavior = MADV_NOHUGEPAGE; break; 447 case 69: behavior = MADV_DONTDUMP; break; 448 case 70: behavior = MADV_DODUMP; break; 449 case 71: behavior = MADV_WIPEONFORK; break; 450 case 72: behavior = MADV_KEEPONFORK; break; 451 case 73: behavior = MADV_COLLAPSE; break; 452 } 453 454 return sys_madvise(start, len_in, behavior); 455 } 456