arch/parisc/kernel/sys_parisc.c

   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 }