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) 1999-2014 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 27 /* we construct an artificial offset for the mapping based on the physical 28 * address of the kernel mapping variable */ 29 #define GET_LAST_MMAP(filp) \ 30 (filp ? ((unsigned long) filp->f_mapping) >> 8 : 0UL) 31 #define SET_LAST_MMAP(filp, val) \ 32 { /* nothing */ } 33 34 static int get_offset(unsigned int last_mmap) 35 { 36 return (last_mmap & (SHM_COLOUR-1)) >> PAGE_SHIFT; 37 } 38 39 static unsigned long shared_align_offset(unsigned int last_mmap, 40 unsigned long pgoff) 41 { 42 return (get_offset(last_mmap) + pgoff) << PAGE_SHIFT; 43 } 44 45 static inline unsigned long COLOR_ALIGN(unsigned long addr, 46 unsigned int last_mmap, unsigned long pgoff) 47 { 48 unsigned long base = (addr+SHM_COLOUR-1) & ~(SHM_COLOUR-1); 49 unsigned long off = (SHM_COLOUR-1) & 50 (shared_align_offset(last_mmap, pgoff) << PAGE_SHIFT); 51 52 return base + off; 53 } 54 55 /* 56 * Top of mmap area (just below the process stack). 57 */ 58 59 /* 60 * When called from arch_get_unmapped_area(), rlim_stack will be NULL, 61 * indicating that "current" should be used instead of a passed-in 62 * value from the exec bprm as done with arch_pick_mmap_layout(). 63 */ 64 static unsigned long mmap_upper_limit(struct rlimit *rlim_stack) 65 { 66 unsigned long stack_base; 67 68 /* Limit stack size - see setup_arg_pages() in fs/exec.c */ 69 stack_base = rlim_stack ? rlim_stack->rlim_max 70 : rlimit_max(RLIMIT_STACK); 71 if (stack_base > STACK_SIZE_MAX) 72 stack_base = STACK_SIZE_MAX; 73 74 /* Add space for stack randomization. */ 75 if (current->flags & PF_RANDOMIZE) 76 stack_base += (STACK_RND_MASK << PAGE_SHIFT); 77 78 return PAGE_ALIGN(STACK_TOP - stack_base); 79 } 80 81 82 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 83 unsigned long len, unsigned long pgoff, unsigned long flags) 84 { 85 struct mm_struct *mm = current->mm; 86 struct vm_area_struct *vma, *prev; 87 unsigned long task_size = TASK_SIZE; 88 int do_color_align, last_mmap; 89 struct vm_unmapped_area_info info; 90 91 if (len > task_size) 92 return -ENOMEM; 93 94 do_color_align = 0; 95 if (filp || (flags & MAP_SHARED)) 96 do_color_align = 1; 97 last_mmap = GET_LAST_MMAP(filp); 98 99 if (flags & MAP_FIXED) { 100 if ((flags & MAP_SHARED) && last_mmap && 101 (addr - shared_align_offset(last_mmap, pgoff)) 102 & (SHM_COLOUR - 1)) 103 return -EINVAL; 104 goto found_addr; 105 } 106 107 if (addr) { 108 if (do_color_align && last_mmap) 109 addr = COLOR_ALIGN(addr, last_mmap, pgoff); 110 else 111 addr = PAGE_ALIGN(addr); 112 113 vma = find_vma_prev(mm, addr, &prev); 114 if (task_size - len >= addr && 115 (!vma || addr + len <= vm_start_gap(vma)) && 116 (!prev || addr >= vm_end_gap(prev))) 117 goto found_addr; 118 } 119 120 info.flags = 0; 121 info.length = len; 122 info.low_limit = mm->mmap_legacy_base; 123 info.high_limit = mmap_upper_limit(NULL); 124 info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; 125 info.align_offset = shared_align_offset(last_mmap, pgoff); 126 addr = vm_unmapped_area(&info); 127 128 found_addr: 129 if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) 130 SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); 131 132 return addr; 133 } 134 135 unsigned long 136 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, 137 const unsigned long len, const unsigned long pgoff, 138 const unsigned long flags) 139 { 140 struct vm_area_struct *vma, *prev; 141 struct mm_struct *mm = current->mm; 142 unsigned long addr = addr0; 143 int do_color_align, last_mmap; 144 struct vm_unmapped_area_info info; 145 146 /* requested length too big for entire address space */ 147 if (len > TASK_SIZE) 148 return -ENOMEM; 149 150 do_color_align = 0; 151 if (filp || (flags & MAP_SHARED)) 152 do_color_align = 1; 153 last_mmap = GET_LAST_MMAP(filp); 154 155 if (flags & MAP_FIXED) { 156 if ((flags & MAP_SHARED) && last_mmap && 157 (addr - shared_align_offset(last_mmap, pgoff)) 158 & (SHM_COLOUR - 1)) 159 return -EINVAL; 160 goto found_addr; 161 } 162 163 /* requesting a specific address */ 164 if (addr) { 165 if (do_color_align && last_mmap) 166 addr = COLOR_ALIGN(addr, last_mmap, pgoff); 167 else 168 addr = PAGE_ALIGN(addr); 169 170 vma = find_vma_prev(mm, addr, &prev); 171 if (TASK_SIZE - len >= addr && 172 (!vma || addr + len <= vm_start_gap(vma)) && 173 (!prev || addr >= vm_end_gap(prev))) 174 goto found_addr; 175 } 176 177 info.flags = VM_UNMAPPED_AREA_TOPDOWN; 178 info.length = len; 179 info.low_limit = PAGE_SIZE; 180 info.high_limit = mm->mmap_base; 181 info.align_mask = last_mmap ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0; 182 info.align_offset = shared_align_offset(last_mmap, pgoff); 183 addr = vm_unmapped_area(&info); 184 if (!(addr & ~PAGE_MASK)) 185 goto found_addr; 186 VM_BUG_ON(addr != -ENOMEM); 187 188 /* 189 * A failed mmap() very likely causes application failure, 190 * so fall back to the bottom-up function here. This scenario 191 * can happen with large stack limits and large mmap() 192 * allocations. 193 */ 194 return arch_get_unmapped_area(filp, addr0, len, pgoff, flags); 195 196 found_addr: 197 if (do_color_align && !last_mmap && !(addr & ~PAGE_MASK)) 198 SET_LAST_MMAP(filp, addr - (pgoff << PAGE_SHIFT)); 199 200 return addr; 201 } 202 203 static int mmap_is_legacy(void) 204 { 205 if (current->personality & ADDR_COMPAT_LAYOUT) 206 return 1; 207 208 /* parisc stack always grows up - so a unlimited stack should 209 * not be an indicator to use the legacy memory layout. 210 * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY) 211 * return 1; 212 */ 213 214 return sysctl_legacy_va_layout; 215 } 216 217 static unsigned long mmap_rnd(void) 218 { 219 unsigned long rnd = 0; 220 221 if (current->flags & PF_RANDOMIZE) 222 rnd = get_random_int() & MMAP_RND_MASK; 223 224 return rnd << PAGE_SHIFT; 225 } 226 227 unsigned long arch_mmap_rnd(void) 228 { 229 return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT; 230 } 231 232 static unsigned long mmap_legacy_base(void) 233 { 234 return TASK_UNMAPPED_BASE + mmap_rnd(); 235 } 236 237 /* 238 * This function, called very early during the creation of a new 239 * process VM image, sets up which VM layout function to use: 240 */ 241 void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) 242 { 243 mm->mmap_legacy_base = mmap_legacy_base(); 244 mm->mmap_base = mmap_upper_limit(rlim_stack); 245 246 if (mmap_is_legacy()) { 247 mm->mmap_base = mm->mmap_legacy_base; 248 mm->get_unmapped_area = arch_get_unmapped_area; 249 } else { 250 mm->get_unmapped_area = arch_get_unmapped_area_topdown; 251 } 252 } 253 254 255 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, 256 unsigned long prot, unsigned long flags, unsigned long fd, 257 unsigned long pgoff) 258 { 259 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 260 we have. */ 261 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 262 pgoff >> (PAGE_SHIFT - 12)); 263 } 264 265 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, 266 unsigned long prot, unsigned long flags, unsigned long fd, 267 unsigned long offset) 268 { 269 if (!(offset & ~PAGE_MASK)) { 270 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 271 offset >> PAGE_SHIFT); 272 } else { 273 return -EINVAL; 274 } 275 } 276 277 /* Fucking broken ABI */ 278 279 #ifdef CONFIG_64BIT 280 asmlinkage long parisc_truncate64(const char __user * path, 281 unsigned int high, unsigned int low) 282 { 283 return ksys_truncate(path, (long)high << 32 | low); 284 } 285 286 asmlinkage long parisc_ftruncate64(unsigned int fd, 287 unsigned int high, unsigned int low) 288 { 289 return ksys_ftruncate(fd, (long)high << 32 | low); 290 } 291 292 /* stubs for the benefit of the syscall_table since truncate64 and truncate 293 * are identical on LP64 */ 294 asmlinkage long sys_truncate64(const char __user * path, unsigned long length) 295 { 296 return ksys_truncate(path, length); 297 } 298 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length) 299 { 300 return ksys_ftruncate(fd, length); 301 } 302 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) 303 { 304 return sys_fcntl(fd, cmd, arg); 305 } 306 #else 307 308 asmlinkage long parisc_truncate64(const char __user * path, 309 unsigned int high, unsigned int low) 310 { 311 return ksys_truncate(path, (loff_t)high << 32 | low); 312 } 313 314 asmlinkage long parisc_ftruncate64(unsigned int fd, 315 unsigned int high, unsigned int low) 316 { 317 return sys_ftruncate64(fd, (loff_t)high << 32 | low); 318 } 319 #endif 320 321 asmlinkage ssize_t parisc_pread64(unsigned int fd, char __user *buf, size_t count, 322 unsigned int high, unsigned int low) 323 { 324 return ksys_pread64(fd, buf, count, (loff_t)high << 32 | low); 325 } 326 327 asmlinkage ssize_t parisc_pwrite64(unsigned int fd, const char __user *buf, 328 size_t count, unsigned int high, unsigned int low) 329 { 330 return ksys_pwrite64(fd, buf, count, (loff_t)high << 32 | low); 331 } 332 333 asmlinkage ssize_t parisc_readahead(int fd, unsigned int high, unsigned int low, 334 size_t count) 335 { 336 return ksys_readahead(fd, (loff_t)high << 32 | low, count); 337 } 338 339 asmlinkage long parisc_fadvise64_64(int fd, 340 unsigned int high_off, unsigned int low_off, 341 unsigned int high_len, unsigned int low_len, int advice) 342 { 343 return ksys_fadvise64_64(fd, (loff_t)high_off << 32 | low_off, 344 (loff_t)high_len << 32 | low_len, advice); 345 } 346 347 asmlinkage long parisc_sync_file_range(int fd, 348 u32 hi_off, u32 lo_off, u32 hi_nbytes, u32 lo_nbytes, 349 unsigned int flags) 350 { 351 return ksys_sync_file_range(fd, (loff_t)hi_off << 32 | lo_off, 352 (loff_t)hi_nbytes << 32 | lo_nbytes, flags); 353 } 354 355 asmlinkage long parisc_fallocate(int fd, int mode, u32 offhi, u32 offlo, 356 u32 lenhi, u32 lenlo) 357 { 358 return ksys_fallocate(fd, mode, ((u64)offhi << 32) | offlo, 359 ((u64)lenhi << 32) | lenlo); 360 } 361 362 long parisc_personality(unsigned long personality) 363 { 364 long err; 365 366 if (personality(current->personality) == PER_LINUX32 367 && personality(personality) == PER_LINUX) 368 personality = (personality & ~PER_MASK) | PER_LINUX32; 369 370 err = sys_personality(personality); 371 if (personality(err) == PER_LINUX32) 372 err = (err & ~PER_MASK) | PER_LINUX; 373 374 return err; 375 } 376