/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_GENERIC_UACCESS_H #define __ASM_GENERIC_UACCESS_H /* * User space memory access functions, these should work * on any machine that has kernel and user data in the same * address space, e.g. all NOMMU machines. */ #include <linux/string.h> #include <asm/segment.h> #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) #ifndef KERNEL_DS #define KERNEL_DS MAKE_MM_SEG(~0UL) #endif #ifndef USER_DS #define USER_DS MAKE_MM_SEG(TASK_SIZE - 1) #endif #ifndef get_fs #define get_ds() (KERNEL_DS) #define get_fs() (current_thread_info()->addr_limit) static inline void set_fs(mm_segment_t fs) { current_thread_info()->addr_limit = fs; } #endif #ifndef segment_eq #define segment_eq(a, b) ((a).seg == (b).seg) #endif #define access_ok(type, addr, size) __access_ok((unsigned long)(addr),(size)) /* * The architecture should really override this if possible, at least * doing a check on the get_fs() */ #ifndef __access_ok static inline int __access_ok(unsigned long addr, unsigned long size) { return 1; } #endif /* * These are the main single-value transfer routines. They automatically * use the right size if we just have the right pointer type. * This version just falls back to copy_{from,to}_user, which should * provide a fast-path for small values. */ #define __put_user(x, ptr) \ ({ \ __typeof__(*(ptr)) __x = (x); \ int __pu_err = -EFAULT; \ __chk_user_ptr(ptr); \ switch (sizeof (*(ptr))) { \ case 1: \ case 2: \ case 4: \ case 8: \ __pu_err = __put_user_fn(sizeof (*(ptr)), \ ptr, &__x); \ break; \ default: \ __put_user_bad(); \ break; \ } \ __pu_err; \ }) #define put_user(x, ptr) \ ({ \ void __user *__p = (ptr); \ might_fault(); \ access_ok(VERIFY_WRITE, __p, sizeof(*ptr)) ? \ __put_user((x), ((__typeof__(*(ptr)) __user *)__p)) : \ -EFAULT; \ }) #ifndef __put_user_fn static inline int __put_user_fn(size_t size, void __user *ptr, void *x) { return unlikely(raw_copy_to_user(ptr, x, size)) ? -EFAULT : 0; } #define __put_user_fn(sz, u, k) __put_user_fn(sz, u, k) #endif extern int __put_user_bad(void) __attribute__((noreturn)); #define __get_user(x, ptr) \ ({ \ int __gu_err = -EFAULT; \ __chk_user_ptr(ptr); \ switch (sizeof(*(ptr))) { \ case 1: { \ unsigned char __x = 0; \ __gu_err = __get_user_fn(sizeof (*(ptr)), \ ptr, &__x); \ (x) = *(__force __typeof__(*(ptr)) *) &__x; \ break; \ }; \ case 2: { \ unsigned short __x = 0; \ __gu_err = __get_user_fn(sizeof (*(ptr)), \ ptr, &__x); \ (x) = *(__force __typeof__(*(ptr)) *) &__x; \ break; \ }; \ case 4: { \ unsigned int __x = 0; \ __gu_err = __get_user_fn(sizeof (*(ptr)), \ ptr, &__x); \ (x) = *(__force __typeof__(*(ptr)) *) &__x; \ break; \ }; \ case 8: { \ unsigned long long __x = 0; \ __gu_err = __get_user_fn(sizeof (*(ptr)), \ ptr, &__x); \ (x) = *(__force __typeof__(*(ptr)) *) &__x; \ break; \ }; \ default: \ __get_user_bad(); \ break; \ } \ __gu_err; \ }) #define get_user(x, ptr) \ ({ \ const void __user *__p = (ptr); \ might_fault(); \ access_ok(VERIFY_READ, __p, sizeof(*ptr)) ? \ __get_user((x), (__typeof__(*(ptr)) __user *)__p) :\ ((x) = (__typeof__(*(ptr)))0,-EFAULT); \ }) #ifndef __get_user_fn static inline int __get_user_fn(size_t size, const void __user *ptr, void *x) { return unlikely(raw_copy_from_user(x, ptr, size)) ? -EFAULT : 0; } #define __get_user_fn(sz, u, k) __get_user_fn(sz, u, k) #endif extern int __get_user_bad(void) __attribute__((noreturn)); /* * Copy a null terminated string from userspace. */ #ifndef __strncpy_from_user static inline long __strncpy_from_user(char *dst, const char __user *src, long count) { char *tmp; strncpy(dst, (const char __force *)src, count); for (tmp = dst; *tmp && count > 0; tmp++, count--) ; return (tmp - dst); } #endif static inline long strncpy_from_user(char *dst, const char __user *src, long count) { if (!access_ok(VERIFY_READ, src, 1)) return -EFAULT; return __strncpy_from_user(dst, src, count); } /* * Return the size of a string (including the ending 0) * * Return 0 on exception, a value greater than N if too long */ #ifndef __strnlen_user #define __strnlen_user(s, n) (strnlen((s), (n)) + 1) #endif /* * Unlike strnlen, strnlen_user includes the nul terminator in * its returned count. Callers should check for a returned value * greater than N as an indication the string is too long. */ static inline long strnlen_user(const char __user *src, long n) { if (!access_ok(VERIFY_READ, src, 1)) return 0; return __strnlen_user(src, n); } /* * Zero Userspace */ #ifndef __clear_user static inline __must_check unsigned long __clear_user(void __user *to, unsigned long n) { memset((void __force *)to, 0, n); return 0; } #endif static inline __must_check unsigned long clear_user(void __user *to, unsigned long n) { might_fault(); if (!access_ok(VERIFY_WRITE, to, n)) return n; return __clear_user(to, n); } #include <asm/extable.h> #endif /* __ASM_GENERIC_UACCESS_H */
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bitops | Folder | 0755 |
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4level-fixup.h | File | 1.07 KB | 0644 |
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5level-fixup.h | File | 1.15 KB | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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asm-prototypes.h | File | 507 B | 0644 |
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atomic-long.h | File | 7.09 KB | 0644 |
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atomic.h | File | 5.11 KB | 0644 |
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atomic64.h | File | 2.26 KB | 0644 |
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audit_change_attr.h | File | 484 B | 0644 |
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audit_dir_write.h | File | 500 B | 0644 |
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audit_read.h | File | 241 B | 0644 |
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audit_signal.h | File | 36 B | 0644 |
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audit_write.h | File | 461 B | 0644 |
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barrier.h | File | 6.01 KB | 0644 |
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bitops.h | File | 1.09 KB | 0644 |
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bitsperlong.h | File | 592 B | 0644 |
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bug.h | File | 6.6 KB | 0644 |
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bugs.h | File | 267 B | 0644 |
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cache.h | File | 384 B | 0644 |
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cacheflush.h | File | 1.31 KB | 0644 |
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checksum.h | File | 2.27 KB | 0644 |
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clkdev.h | File | 706 B | 0644 |
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cmpxchg-local.h | File | 1.43 KB | 0644 |
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cmpxchg.h | File | 2.23 KB | 0644 |
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current.h | File | 256 B | 0644 |
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delay.h | File | 1.13 KB | 0644 |
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device.h | File | 245 B | 0644 |
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div64.h | File | 7.28 KB | 0644 |
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dma-contiguous.h | File | 238 B | 0644 |
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dma.h | File | 553 B | 0644 |
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early_ioremap.h | File | 1.66 KB | 0644 |
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emergency-restart.h | File | 248 B | 0644 |
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exec.h | File | 697 B | 0644 |
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export.h | File | 2.2 KB | 0644 |
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extable.h | File | 802 B | 0644 |
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fb.h | File | 271 B | 0644 |
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fixmap.h | File | 2.84 KB | 0644 |
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ftrace.h | File | 460 B | 0644 |
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futex.h | File | 2.88 KB | 0644 |
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getorder.h | File | 1.22 KB | 0644 |
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gpio.h | File | 4.45 KB | 0644 |
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hardirq.h | File | 532 B | 0644 |
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hugetlb.h | File | 845 B | 0644 |
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hw_irq.h | File | 270 B | 0644 |
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ide_iops.h | File | 791 B | 0644 |
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int-ll64.h | File | 932 B | 0644 |
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io.h | File | 20.39 KB | 0644 |
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ioctl.h | File | 506 B | 0644 |
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iomap.h | File | 3.16 KB | 0644 |
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irq.h | File | 403 B | 0644 |
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irq_regs.h | File | 980 B | 0644 |
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irq_work.h | File | 194 B | 0644 |
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irqflags.h | File | 1.51 KB | 0644 |
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kdebug.h | File | 182 B | 0644 |
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kmap_types.h | File | 198 B | 0644 |
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kprobes.h | File | 868 B | 0644 |
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kvm_para.h | File | 480 B | 0644 |
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linkage.h | File | 225 B | 0644 |
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local.h | File | 2.23 KB | 0644 |
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local64.h | File | 3.8 KB | 0644 |
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mcs_spinlock.h | File | 260 B | 0644 |
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memory_model.h | File | 2.16 KB | 0644 |
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mm-arch-hooks.h | File | 388 B | 0644 |
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mm_hooks.h | File | 885 B | 0644 |
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mmu.h | File | 449 B | 0644 |
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mmu_context.h | File | 881 B | 0644 |
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module.h | File | 1.09 KB | 0644 |
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msi.h | File | 838 B | 0644 |
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page.h | File | 2.4 KB | 0644 |
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param.h | File | 367 B | 0644 |
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parport.h | File | 604 B | 0644 |
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pci.h | File | 581 B | 0644 |
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pci_iomap.h | File | 1.96 KB | 0644 |
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percpu.h | File | 12.72 KB | 0644 |
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pgalloc.h | File | 342 B | 0644 |
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pgtable-nop4d-hack.h | File | 1.86 KB | 0644 |
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pgtable-nop4d.h | File | 1.64 KB | 0644 |
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pgtable-nopmd.h | File | 1.9 KB | 0644 |
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pgtable-nopud.h | File | 1.97 KB | 0644 |
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pgtable.h | File | 29.5 KB | 0644 |
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preempt.h | File | 1.94 KB | 0644 |
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ptrace.h | File | 1.58 KB | 0644 |
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qrwlock.h | File | 3.78 KB | 0644 |
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qrwlock_types.h | File | 655 B | 0644 |
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qspinlock.h | File | 3.67 KB | 0644 |
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qspinlock_types.h | File | 2.77 KB | 0644 |
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resource.h | File | 1.07 KB | 0644 |
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rwsem.h | File | 3.21 KB | 0644 |
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seccomp.h | File | 1.3 KB | 0644 |
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sections.h | File | 4.8 KB | 0644 |
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segment.h | File | 249 B | 0644 |
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serial.h | File | 345 B | 0644 |
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set_memory.h | File | 362 B | 0644 |
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signal.h | File | 308 B | 0644 |
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simd.h | File | 436 B | 0644 |
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sizes.h | File | 78 B | 0644 |
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spinlock.h | File | 329 B | 0644 |
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statfs.h | File | 169 B | 0644 |
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string.h | File | 281 B | 0644 |
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switch_to.h | File | 992 B | 0644 |
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syscall.h | File | 6.18 KB | 0644 |
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syscalls.h | File | 739 B | 0644 |
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termios-base.h | File | 2.11 KB | 0644 |
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termios.h | File | 2.81 KB | 0644 |
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timex.h | File | 508 B | 0644 |
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tlb.h | File | 9.4 KB | 0644 |
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tlbflush.h | File | 485 B | 0644 |
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topology.h | File | 2.18 KB | 0644 |
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trace_clock.h | File | 391 B | 0644 |
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uaccess.h | File | 5.22 KB | 0644 |
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unaligned.h | File | 1.05 KB | 0644 |
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unistd.h | File | 318 B | 0644 |
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user.h | File | 242 B | 0644 |
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vga.h | File | 587 B | 0644 |
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vmlinux.lds.h | File | 29.17 KB | 0644 |
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vtime.h | File | 52 B | 0644 |
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word-at-a-time.h | File | 2.75 KB | 0644 |
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xor.h | File | 13.63 KB | 0644 |
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