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