arch/parisc/kernel/sys_parisc.c

   1
   2 /*
   3  *    PARISC specific syscalls
   4  *
   5  *    Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
   6  *    Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
   7  *    Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
   8  *    Copyright (C) 1999-2014 Helge Deller <deller@gmx.de>
   9  *
  10  *
  11  *    This program is free software; you can redistribute it and/or modify
  12  *    it under the terms of the GNU General Public License as published by
  13  *    the Free Software Foundation; either version 2 of the License, or
  14  *    (at your option) any later version.
  15  *
  16  *    This program is distributed in the hope that it will be useful,
  17  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *    GNU General Public License for more details.
  20  *
  21  *    You should have received a copy of the GNU General Public License
  22  *    along with this program; if not, write to the Free Software
  23  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  */
  25
  26 #include <linux/uaccess.h>
  27 #include <asm/elf.h>
  28 #include <linux/file.h>
  29 #include <linux/fs.h>
  30 #include <linux/linkage.h>
  31 #include <linux/mm.h>
  32 #include <linux/mman.h>
  33 #include <linux/sched/signal.h>
  34 #include <linux/shm.h>
  35 #include <linux/syscalls.h>
  36 #include <linux/utsname.h>
  37 #include <linux/personality.h>
  38 #include <linux/random.h>
  39
  40 /* we construct an artificial offset for the mapping based on the physical
  41  * address of the kernel mapping variable */
  42 #define GET_LAST_MMAP(filp)             \
  43         (filp ? ((unsigned long) filp->f_mapping) >> 8 : 0UL)
  44 #define SET_LAST_MMAP(filp, val)        \
  45          { /* nothing */ }
  46
  47 static int get_offset(unsigned int last_mmap)
  48 {
  49         return (last_mmap & (SHM_COLOUR-1)) >> PAGE_SHIFT;
  50 }
  51
  52 static unsigned long shared_align_offset(unsigned int last_mmap,
  53                                          unsigned long pgoff)
  54 {
  55         return (get_offset(last_mmap) + pgoff) << PAGE_SHIFT;
  56 }
  57
  58 static inline unsigned long COLOR_ALIGN(unsigned long addr,
  59                          unsigned int last_mmap, unsigned long pgoff)
  60 {
  61         unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1);
  62         unsigned long off  = (SHM_COLOUR-1) &
  63                 (shared_align_offset(last_mmap, pgoff) << PAGE_SHIFT);
  64
  65         return base + off;
  66 }
  67
  68 /*
  69  * Top of mmap area (just below the process stack).
  70  */
  71
  72 static unsigned long mmap_upper_limit(void)
  73 {
  74         unsigned long stack_base;
  75
  76         /* Limit stack size - see setup_arg_pages() in fs/exec.c */
  77         stack_base = rlimit_max(RLIMIT_STACK);
  78         if (stack_base > STACK_SIZE_MAX)
  79                 stack_base = STACK_SIZE_MAX;
  80
  81         /* Add space for stack randomization. */
  82         stack_base += (STACK_RND_MASK << PAGE_SHIFT);
  83
  84         return PAGE_ALIGN(STACK_TOP - stack_base);
  85 }
  86
  87
  88 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
  89                 unsigned long len, unsigned long pgoff, unsigned long flags)
  90 {
  91         struct mm_struct *mm = current->mm;
  92         struct vm_area_struct *vma;
  93         unsigned long task_size = TASK_SIZE;
  94         int do_color_align, last_mmap;
  95         struct vm_unmapped_area_info info;
  96
  97         if (len > task_size)
  98                 return -ENOMEM;
  99
 100         do_color_align = 0;
 101         if (filp || (flags & MAP_SHARED))
 102                 do_color_align = 1;
 103         last_mmap = GET_LAST_MMAP(filp);
 104
 105         if (flags & MAP_FIXED) {
 106                 if ((flags & MAP_SHARED) && last_mmap &&
 107                     (addr - shared_align_offset(last_mmap, pgoff))
 108                                 & (SHM_COLOUR - 1))
 109                         return -EINVAL;
 110                 goto found_addr;
 111         }
 112
 113         if (addr) {
 114                 if (do_color_align && last_mmap)
 115                         addr = COLOR_ALIGN(addr, last_mmap, pgoff);
 116                 else
 117                         addr = PAGE_ALIGN(addr);
 118
 119                 vma = find_vma(mm, addr);
 120                 if (task_size - len >= addr &&
 121                     (!vma || addr + len <= vma->vm_start))
 122                         goto found_addr;
 123         }
 124
 125         info.flags = 0;
 126         info.length = len;
 127         info.low_limit = mm->mmap_legacy_base;
 128         info.high_limit = mmap_upper_limit();
 129         info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
 130         info.align_offset = shared_align_offset(last_mmap, pgoff);
 131         addr = vm_unmapped_area(&info);
 132
 133 found_addr:
 134         if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK))
 135                 SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT));
 136
 137         return addr;
 138 }
 139
 140 unsigned long
 141 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 142                           const unsigned long len, const unsigned long pgoff,
 143                           const unsigned long flags)
 144 {
 145         struct vm_area_struct *vma;
 146         struct mm_struct *mm = current->mm;
 147         unsigned long addr = addr0;
 148         int do_color_align, last_mmap;
 149         struct vm_unmapped_area_info info;
 150
 151 #ifdef CONFIG_64BIT
 152         /* This should only ever run for 32-bit processes.  */
 153         BUG_ON(!test_thread_flag(TIF_32BIT));
 154 #endif
 155
 156         /* requested length too big for entire address space */
 157         if (len > TASK_SIZE)
 158                 return -ENOMEM;
 159
 160         do_color_align = 0;
 161         if (filp || (flags & MAP_SHARED))
 162                 do_color_align = 1;
 163         last_mmap = GET_LAST_MMAP(filp);
 164
 165         if (flags & MAP_FIXED) {
 166                 if ((flags & MAP_SHARED) && last_mmap &&
 167                     (addr - shared_align_offset(last_mmap, pgoff))
 168                         & (SHM_COLOUR - 1))
 169                         return -EINVAL;
 170                 goto found_addr;
 171         }
 172
 173         /* requesting a specific address */
 174         if (addr) {
 175                 if (do_color_align && last_mmap)
 176                         addr = COLOR_ALIGN(addr, last_mmap, pgoff);
 177                 else
 178                         addr = PAGE_ALIGN(addr);
 179                 vma = find_vma(mm, addr);
 180                 if (TASK_SIZE - len >= addr &&
 181                     (!vma || addr + len <= vma->vm_start))
 182                         goto found_addr;
 183         }
 184
 185         info.flags = VM_UNMAPPED_AREA_TOPDOWN;
 186         info.length = len;
 187         info.low_limit = PAGE_SIZE;
 188         info.high_limit = mm->mmap_base;
 189         info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
 190         info.align_offset = shared_align_offset(last_mmap, pgoff);
 191         addr = vm_unmapped_area(&info);
 192         if (!(addr & ~PAGE_MASK))
 193                 goto found_addr;
 194         VM_BUG_ON(addr != -ENOMEM);
 195
 196         /*
 197          * A failed mmap() very likely causes application failure,
 198          * so fall back to the bottom-up function here. This scenario
 199          * can happen with large stack limits and large mmap()
 200          * allocations.
 201          */
 202         return arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
 203
 204 found_addr:
 205         if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK))
 206                 SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT));
 207
 208         return addr;
 209 }
 210
 211 static int mmap_is_legacy(void)
 212 {
 213         if (current->personality & ADDR_COMPAT_LAYOUT)
 214                 return 1;
 215
 216         /* parisc stack always grows up - so a unlimited stack should
 217          * not be an indicator to use the legacy memory layout.
 218          * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY)
 219          *      return 1;
 220          */
 221
 222         return sysctl_legacy_va_layout;
 223 }
 224
 225 static unsigned long mmap_rnd(void)
 226 {
 227         unsigned long rnd = 0;
 228
 229         if (current->flags & PF_RANDOMIZE)
 230                 rnd = get_random_int() & MMAP_RND_MASK;
 231
 232         return rnd << PAGE_SHIFT;
 233 }
 234
 235 unsigned long arch_mmap_rnd(void)
 236 {
 237         return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT;
 238 }
 239
 240 static unsigned long mmap_legacy_base(void)
 241 {
 242         return TASK_UNMAPPED_BASE + mmap_rnd();
 243 }
 244
 245 /*
 246  * This function, called very early during the creation of a new
 247  * process VM image, sets up which VM layout function to use:
 248  */
 249 void arch_pick_mmap_layout(struct mm_struct *mm)
 250 {
 251         mm->mmap_legacy_base = mmap_legacy_base();
 252         mm->mmap_base = mmap_upper_limit();
 253
 254         if (mmap_is_legacy()) {
 255                 mm->mmap_base = mm->mmap_legacy_base;
 256                 mm->get_unmapped_area = arch_get_unmapped_area;
 257         } else {
 258                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
 259         }
 260 }
 261
 262
 263 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 264         unsigned long prot, unsigned long flags, unsigned long fd,
 265         unsigned long pgoff)
 266 {
 267         /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
 268            we have. */
 269         return sys_mmap_pgoff(addr, len, prot, flags, fd,
 270                               pgoff >> (PAGE_SHIFT - 12));
 271 }
 272
 273 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 274                 unsigned long prot, unsigned long flags, unsigned long fd,
 275                 unsigned long offset)
 276 {
 277         if (!(offset & ~PAGE_MASK)) {
 278                 return sys_mmap_pgoff(addr, len, prot, flags, fd,
 279                                         offset >> PAGE_SHIFT);
 280         } else {
 281                 return -EINVAL;
 282         }
 283 }
 284
 285 /* Fucking broken ABI */
 286
 287 #ifdef CONFIG_64BIT
 288 asmlinkage long parisc_truncate64(const char __user * path,
 289                                         unsigned int high, unsigned int low)
 290 {
 291         return sys_truncate(path, (long)high << 32 | low);
 292 }
 293
 294 asmlinkage long parisc_ftruncate64(unsigned int fd,
 295                                         unsigned int high, unsigned int low)
 296 {
 297         return sys_ftruncate(fd, (long)high << 32 | low);
 298 }
 299
 300 /* stubs for the benefit of the syscall_table since truncate64 and truncate
 301  * are identical on LP64 */
 302 asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
 303 {
 304         return sys_truncate(path, length);
 305 }
 306 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
 307 {
 308         return sys_ftruncate(fd, length);
 309 }
 310 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
 311 {
 312         return sys_fcntl(fd, cmd, arg);
 313 }
 314 #else
 315
 316 asmlinkage long parisc_truncate64(const char __user * path,
 317                                         unsigned int high, unsigned int low)
 318 {
 319         return sys_truncate64(path, (loff_t)high << 32 | low);
 320 }
 321
 322 asmlinkage long parisc_ftruncate64(unsigned int fd,
 323                                         unsigned int high, unsigned int low)
 324 {
 325         return sys_ftruncate64(fd, (loff_t)high << 32 | low);
 326 }
 327 #endif
 328
 329 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count,
 330                                         unsigned int high, unsigned int low)
 331 {
 332         return sys_pread64(fd, buf, count, (loff_t)high << 32 | low);
 333 }
 334
 335 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf,
 336                         size_t count, unsigned int high, unsigned int low)
 337 {
 338         return sys_pwrite64(fd, buf, count, (loff_t)high << 32 | low);
 339 }
 340
 341 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low,
 342                                     size_t count)
 343 {
 344         return sys_readahead(fd, (loff_t)high << 32 | low, count);
 345 }
 346
 347 asmlinkage long parisc_fadvise64_64(int fd,
 348                         unsigned int high_off, unsigned int low_off,
 349                         unsigned int high_len, unsigned int low_len, int advice)
 350 {
 351         return sys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off,
 352                         (loff_t)high_len << 32 | low_len, advice);
 353 }
 354
 355 asmlinkage long parisc_sync_file_range(int fd,
 356                         u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes,
 357                         unsigned int flags)
 358 {
 359         return sys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off,
 360                         (loff_t)hi_nbytes << 32 | lo_nbytes, flags);
 361 }
 362
 363 asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo,
 364                                 u32 lenhi, u32 lenlo)
 365 {
 366         return sys_fallocate(fd, mode, ((u64)offhi << 32) | offlo,
 367                              ((u64)lenhi << 32) | lenlo);
 368 }
 369
 370 long parisc_personality(unsigned long personality)
 371 {
 372         long err;
 373
 374         if (personality(current->personality) == PER_LINUX32
 375             && personality(personality) == PER_LINUX)
 376                 personality = (personality & ~PER_MASK) | PER_LINUX32;
 377
 378         err = sys_personality(personality);
 379         if (personality(err) == PER_LINUX32)
 380                 err = (err & ~PER_MASK) | PER_LINUX;
 381
 382         return err;
 383 }