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 #include <linux/elf-randomize.h> 28 29 /* 30 * Construct an artificial page offset for the mapping based on the physical 31 * address of the kernel file mapping variable. 32 */ 33 #define GET_FILP_PGOFF(filp) \ 34 (filp ? (((unsigned long) filp->f_mapping) >> 8) \ 35 & ((SHM_COLOUR-1) >> PAGE_SHIFT) : 0UL) 36 37 static unsigned long shared_align_offset(unsigned long filp_pgoff, 38 unsigned long pgoff) 39 { 40 return (filp_pgoff + pgoff) << PAGE_SHIFT; 41 } 42 43 static inline unsigned long COLOR_ALIGN(unsigned long addr, 44 unsigned long filp_pgoff, unsigned long pgoff) 45 { 46 unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1); 47 unsigned long off = (SHM_COLOUR-1) & 48 shared_align_offset(filp_pgoff, pgoff); 49 return base + off; 50 } 51 52 53 #define STACK_SIZE_DEFAULT (USER_WIDE_MODE \ 54 ? (1 << 30) /* 1 GB */ \ 55 : (CONFIG_STACK_MAX_DEFAULT_SIZE_MB*1024*1024)) 56 57 unsigned long calc_max_stack_size(unsigned long stack_max) 58 { 59 #ifdef CONFIG_COMPAT 60 if (!USER_WIDE_MODE && (stack_max == COMPAT_RLIM_INFINITY)) 61 stack_max = STACK_SIZE_DEFAULT; 62 else 63 #endif 64 if (stack_max == RLIM_INFINITY) 65 stack_max = STACK_SIZE_DEFAULT; 66 67 return stack_max; 68 } 69 70 71 /* 72 * Top of mmap area (just below the process stack). 73 */ 74 75 /* 76 * When called from arch_get_unmapped_area(), rlim_stack will be NULL, 77 * indicating that "current" should be used instead of a passed-in 78 * value from the exec bprm as done with arch_pick_mmap_layout(). 79 */ 80 unsigned long mmap_upper_limit(struct rlimit *rlim_stack) 81 { 82 unsigned long stack_base; 83 84 /* Limit stack size - see setup_arg_pages() in fs/exec.c */ 85 stack_base = rlim_stack ? rlim_stack->rlim_max 86 : rlimit_max(RLIMIT_STACK); 87 88 stack_base = calc_max_stack_size(stack_base); 89 90 /* Add space for stack randomization. */ 91 if (current->flags & PF_RANDOMIZE) 92 stack_base += (STACK_RND_MASK << PAGE_SHIFT); 93 94 return PAGE_ALIGN(STACK_TOP - stack_base); 95 } 96 97 enum mmap_allocation_direction {UP, DOWN}; 98 99 static unsigned long arch_get_unmapped_area_common(struct file *filp, 100 unsigned long addr, unsigned long len, unsigned long pgoff, 101 unsigned long flags, enum mmap_allocation_direction dir) 102 { 103 struct mm_struct *mm = current->mm; 104 struct vm_area_struct *vma, *prev; 105 unsigned long filp_pgoff; 106 int do_color_align; 107 struct vm_unmapped_area_info info = { 108 .length = len 109 }; 110 111 if (unlikely(len > TASK_SIZE)) 112 return -ENOMEM; 113 114 do_color_align = 0; 115 if (filp || (flags & MAP_SHARED)) 116 do_color_align = 1; 117 filp_pgoff = GET_FILP_PGOFF(filp); 118 119 if (flags & MAP_FIXED) { 120 /* Even MAP_FIXED mappings must reside within TASK_SIZE */ 121 if (TASK_SIZE - len < addr) 122 return -EINVAL; 123 124 if ((flags & MAP_SHARED) && filp && 125 (addr - shared_align_offset(filp_pgoff, pgoff)) 126 & (SHM_COLOUR - 1)) 127 return -EINVAL; 128 return addr; 129 } 130 131 if (addr) { 132 if (do_color_align) 133 addr = COLOR_ALIGN(addr, filp_pgoff, pgoff); 134 else 135 addr = PAGE_ALIGN(addr); 136 137 vma = find_vma_prev(mm, addr, &prev); 138 if (TASK_SIZE - len >= addr && 139 (!vma || addr + len <= vm_start_gap(vma)) && 140 (!prev || addr >= vm_end_gap(prev))) 141 return addr; 142 } 143 144 info.align_mask = do_color_align ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; 145 info.align_offset = shared_align_offset(filp_pgoff, pgoff); 146 147 if (dir == DOWN) { 148 info.flags = VM_UNMAPPED_AREA_TOPDOWN; 149 info.low_limit = PAGE_SIZE; 150 info.high_limit = mm->mmap_base; 151 addr = vm_unmapped_area(&info); 152 if (!(addr & ~PAGE_MASK)) 153 return addr; 154 VM_BUG_ON(addr != -ENOMEM); 155 156 /* 157 * A failed mmap() very likely causes application failure, 158 * so fall back to the bottom-up function here. This scenario 159 * can happen with large stack limits and large mmap() 160 * allocations. 161 */ 162 } 163 164 info.low_limit = mm->mmap_base; 165 info.high_limit = mmap_upper_limit(NULL); 166 return vm_unmapped_area(&info); 167 } 168 169 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 170 unsigned long len, unsigned long pgoff, unsigned long flags, 171 vm_flags_t vm_flags) 172 { 173 return arch_get_unmapped_area_common(filp, 174 addr, len, pgoff, flags, UP); 175 } 176 177 unsigned long arch_get_unmapped_area_topdown(struct file *filp, 178 unsigned long addr, unsigned long len, unsigned long pgoff, 179 unsigned long flags, vm_flags_t vm_flags) 180 { 181 return arch_get_unmapped_area_common(filp, 182 addr, len, pgoff, flags, DOWN); 183 } 184 185 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, 186 unsigned long prot, unsigned long flags, unsigned long fd, 187 unsigned long pgoff) 188 { 189 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 190 we have. */ 191 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 192 pgoff >> (PAGE_SHIFT - 12)); 193 } 194 195 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, 196 unsigned long prot, unsigned long flags, unsigned long fd, 197 unsigned long offset) 198 { 199 if (!(offset & ~PAGE_MASK)) { 200 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 201 offset >> PAGE_SHIFT); 202 } else { 203 return -EINVAL; 204 } 205 } 206 207 /* Fucking broken ABI */ 208 209 #ifdef CONFIG_64BIT 210 asmlinkage long parisc_truncate64(const char __user * path, 211 unsigned int high, unsigned int low) 212 { 213 return ksys_truncate(path, (long)high << 32 | low); 214 } 215 216 asmlinkage long parisc_ftruncate64(unsigned int fd, 217 unsigned int high, unsigned int low) 218 { 219 return ksys_ftruncate(fd, (long)high << 32 | low); 220 } 221 222 /* stubs for the benefit of the syscall_table since truncate64 and truncate 223 * are identical on LP64 */ 224 asmlinkage long sys_truncate64(const char __user * path, unsigned long length) 225 { 226 return ksys_truncate(path, length); 227 } 228 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) 229 { 230 return ksys_ftruncate(fd, length); 231 } 232 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) 233 { 234 return sys_fcntl(fd, cmd, arg); 235 } 236 #else 237 238 asmlinkage long parisc_truncate64(const char __user * path, 239 unsigned int high, unsigned int low) 240 { 241 return ksys_truncate(path, (loff_t)high << 32 | low); 242 } 243 244 asmlinkage long parisc_ftruncate64(unsigned int fd, 245 unsigned int high, unsigned int low) 246 { 247 return sys_ftruncate64(fd, (loff_t)high << 32 | low); 248 } 249 #endif 250 251 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, 252 unsigned int high, unsigned int low) 253 { 254 return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low); 255 } 256 257 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, 258 size_t count, unsigned int high, unsigned int low) 259 { 260 return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); 261 } 262 263 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, 264 size_t count) 265 { 266 return ksys_readahead(fd, (loff_t)high << 32 | low, count); 267 } 268 269 asmlinkage long parisc_fadvise64_64(int fd, 270 unsigned int high_off, unsigned int low_off, 271 unsigned int high_len, unsigned int low_len, int advice) 272 { 273 return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, 274 (loff_t)high_len << 32 | low_len, advice); 275 } 276 277 asmlinkage long parisc_sync_file_range(int fd, 278 u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes, 279 unsigned int flags) 280 { 281 return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off, 282 (loff_t)hi_nbytes << 32 | lo_nbytes, flags); 283 } 284 285 asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo, 286 u32 lenhi, u32 lenlo) 287 { 288 return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo, 289 ((u64)lenhi << 32) | lenlo); 290 } 291 292 asmlinkage long parisc_personality(unsigned long personality) 293 { 294 long err; 295 296 if (personality(current->personality) == PER_LINUX32 297 && personality(personality) == PER_LINUX) 298 personality = (personality & ~PER_MASK) | PER_LINUX32; 299 300 err = sys_personality(personality); 301 if (personality(err) == PER_LINUX32) 302 err = (err & ~PER_MASK) | PER_LINUX; 303 304 return err; 305 } 306 307 /* 308 * Up to kernel v5.9 we defined O_NONBLOCK as 000200004, 309 * since then O_NONBLOCK is defined as 000200000. 310 * 311 * The following wrapper functions mask out the old 312 * O_NDELAY bit from calls which use O_NONBLOCK. 313 * 314 * XXX: Remove those in year 2022 (or later)? 315 */ 316 317 #define O_NONBLOCK_OLD 000200004 318 #define O_NONBLOCK_MASK_OUT (O_NONBLOCK_OLD & ~O_NONBLOCK) 319 320 static int FIX_O_NONBLOCK(int flags) 321 { 322 if ((flags & O_NONBLOCK_MASK_OUT) && 323 !test_thread_flag(TIF_NONBLOCK_WARNING)) { 324 set_thread_flag(TIF_NONBLOCK_WARNING); 325 pr_warn("%s(%d) uses a deprecated O_NONBLOCK value." 326 " Please recompile with newer glibc.\n", 327 current->comm, current->pid); 328 } 329 return flags & ~O_NONBLOCK_MASK_OUT; 330 } 331 332 asmlinkage long parisc_timerfd_create(int clockid, int flags) 333 { 334 flags = FIX_O_NONBLOCK(flags); 335 return sys_timerfd_create(clockid, flags); 336 } 337 338 asmlinkage long parisc_signalfd4(int ufd, sigset_t __user *user_mask, 339 size_t sizemask, int flags) 340 { 341 flags = FIX_O_NONBLOCK(flags); 342 return sys_signalfd4(ufd, user_mask, sizemask, flags); 343 } 344 345 #ifdef CONFIG_COMPAT 346 asmlinkage long parisc_compat_signalfd4(int ufd, 347 compat_sigset_t __user *user_mask, 348 compat_size_t sizemask, int flags) 349 { 350 flags = FIX_O_NONBLOCK(flags); 351 return compat_sys_signalfd4(ufd, user_mask, sizemask, flags); 352 } 353 #endif 354 355 asmlinkage long parisc_eventfd2(unsigned int count, int flags) 356 { 357 flags = FIX_O_NONBLOCK(flags); 358 return sys_eventfd2(count, flags); 359 } 360 361 asmlinkage long parisc_userfaultfd(int flags) 362 { 363 flags = FIX_O_NONBLOCK(flags); 364 return sys_userfaultfd(flags); 365 } 366 367 asmlinkage long parisc_pipe2(int __user *fildes, int flags) 368 { 369 flags = FIX_O_NONBLOCK(flags); 370 return sys_pipe2(fildes, flags); 371 } 372 373 asmlinkage long parisc_inotify_init1(int flags) 374 { 375 flags = FIX_O_NONBLOCK(flags); 376 return sys_inotify_init1(flags); 377 } 378 379 /* 380 * madvise() wrapper 381 * 382 * Up to kernel v6.1 parisc has different values than all other 383 * platforms for the MADV_xxx flags listed below. 384 * To keep binary compatibility with existing userspace programs 385 * translate the former values to the new values. 386 * 387 * XXX: Remove this wrapper in year 2025 (or later) 388 */ 389 390 asmlinkage notrace long parisc_madvise(unsigned long start, size_t len_in, int behavior) 391 { 392 switch (behavior) { 393 case 65: behavior = MADV_MERGEABLE; break; 394 case 66: behavior = MADV_UNMERGEABLE; break; 395 case 67: behavior = MADV_HUGEPAGE; break; 396 case 68: behavior = MADV_NOHUGEPAGE; break; 397 case 69: behavior = MADV_DONTDUMP; break; 398 case 70: behavior = MADV_DODUMP; break; 399 case 71: behavior = MADV_WIPEONFORK; break; 400 case 72: behavior = MADV_KEEPONFORK; break; 401 case 73: behavior = MADV_COLLAPSE; break; 402 } 403 404 return sys_madvise(start, len_in, behavior); 405 } 406