^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #ifndef _ARCH_POWERPC_UACCESS_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #define _ARCH_POWERPC_UACCESS_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <asm/ppc_asm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <asm/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <asm/extable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <asm/kup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #ifdef __powerpc64__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) /* We use TASK_SIZE_USER64 as TASK_SIZE is not constant */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #define TASK_SIZE_MAX TASK_SIZE_USER64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define TASK_SIZE_MAX TASK_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static inline bool __access_ok(unsigned long addr, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) return addr < TASK_SIZE_MAX && size <= TASK_SIZE_MAX - addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define access_ok(addr, size) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) (__chk_user_ptr(addr), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) __access_ok((unsigned long)(addr), (size)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * These are the main single-value transfer routines. They automatically
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * use the right size if we just have the right pointer type.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * This gets kind of ugly. We want to return _two_ values in "get_user()"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * and yet we don't want to do any pointers, because that is too much
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * of a performance impact. Thus we have a few rather ugly macros here,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * and hide all the ugliness from the user.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * The "__xxx" versions of the user access functions are versions that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * do not verify the address space, that must have been done previously
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * with a separate "access_ok()" call (this is used when we do multiple
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * accesses to the same area of user memory).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * As we use the same address space for kernel and user data on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * PowerPC, we can just do these as direct assignments. (Of course, the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * exception handling means that it's no longer "just"...)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #define get_user(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) __get_user_check((x), (ptr), sizeof(*(ptr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #define put_user(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) __put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #define __get_user(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) __get_user_nocheck((x), (ptr), sizeof(*(ptr)), true)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #define __put_user(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #define __put_user_goto(x, ptr, label) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) __put_user_nocheck_goto((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)), label)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #define __get_user_allowed(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) __get_user_nocheck((x), (ptr), sizeof(*(ptr)), false)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #define __get_user_inatomic(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) __get_user_nosleep((x), (ptr), sizeof(*(ptr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) #define __put_user_inatomic(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) __put_user_nosleep((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #ifdef CONFIG_PPC64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #define ___get_user_instr(gu_op, dest, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) long __gui_ret = 0; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) unsigned long __gui_ptr = (unsigned long)ptr; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct ppc_inst __gui_inst; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) unsigned int __prefix, __suffix; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) __gui_ret = gu_op(__prefix, (unsigned int __user *)__gui_ptr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (__gui_ret == 0) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if ((__prefix >> 26) == OP_PREFIX) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) __gui_ret = gu_op(__suffix, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) (unsigned int __user *)__gui_ptr + 1); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) __gui_inst = ppc_inst_prefix(__prefix, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) __suffix); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) } else { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) __gui_inst = ppc_inst(__prefix); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (__gui_ret == 0) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) (dest) = __gui_inst; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) __gui_ret; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) #define get_user_instr(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) ___get_user_instr(get_user, x, ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) #define __get_user_instr(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) ___get_user_instr(__get_user, x, ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) #define __get_user_instr_inatomic(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) ___get_user_instr(__get_user_inatomic, x, ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) #else /* !CONFIG_PPC64 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) #define get_user_instr(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) get_user((x).val, (u32 __user *)(ptr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #define __get_user_instr(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) __get_user_nocheck((x).val, (u32 __user *)(ptr), sizeof(u32), true)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) #define __get_user_instr_inatomic(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) __get_user_nosleep((x).val, (u32 __user *)(ptr), sizeof(u32))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) #endif /* CONFIG_PPC64 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) extern long __put_user_bad(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) #define __put_user_size_allowed(x, ptr, size, retval) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) __label__ __pu_failed; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) retval = 0; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) __put_user_size_goto(x, ptr, size, __pu_failed); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) __pu_failed: \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) retval = -EFAULT; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) #define __put_user_size(x, ptr, size, retval) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) allow_write_to_user(ptr, size); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) __put_user_size_allowed(x, ptr, size, retval); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) prevent_write_to_user(ptr, size); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) #define __put_user_nocheck(x, ptr, size) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) long __pu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) __typeof__(*(ptr)) __pu_val = (x); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) __typeof__(size) __pu_size = (size); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (!is_kernel_addr((unsigned long)__pu_addr)) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) might_fault(); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) __chk_user_ptr(__pu_addr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) __put_user_size(__pu_val, __pu_addr, __pu_size, __pu_err); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) __pu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) #define __put_user_check(x, ptr, size) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) long __pu_err = -EFAULT; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) __typeof__(*(ptr)) __pu_val = (x); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) __typeof__(size) __pu_size = (size); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) might_fault(); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if (access_ok(__pu_addr, __pu_size)) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) __put_user_size(__pu_val, __pu_addr, __pu_size, __pu_err); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) __pu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) #define __put_user_nosleep(x, ptr, size) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) long __pu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) __typeof__(*(ptr)) __pu_val = (x); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) __typeof__(size) __pu_size = (size); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) __chk_user_ptr(__pu_addr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) __put_user_size(__pu_val, __pu_addr, __pu_size, __pu_err); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) __pu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) * We don't tell gcc that we are accessing memory, but this is OK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * because we do not write to any memory gcc knows about, so there
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * are no aliasing issues.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) #define __put_user_asm_goto(x, addr, label, op) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) asm_volatile_goto( \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) "1: " op "%U1%X1 %0,%1 # put_user\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) EX_TABLE(1b, %l2) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) : \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) : "r" (x), "m"UPD_CONSTR (*addr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) : \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) : label)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) #ifdef __powerpc64__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) #define __put_user_asm2_goto(x, ptr, label) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) __put_user_asm_goto(x, ptr, label, "std")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) #else /* __powerpc64__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) #define __put_user_asm2_goto(x, addr, label) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) asm_volatile_goto( \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) "1: stw%X1 %0, %1\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) "2: stw%X1 %L0, %L1\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) EX_TABLE(1b, %l2) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) EX_TABLE(2b, %l2) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) : \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) : "r" (x), "m" (*addr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) : \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) : label)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) #endif /* __powerpc64__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) #define __put_user_size_goto(x, ptr, size, label) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) switch (size) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) case 1: __put_user_asm_goto(x, ptr, label, "stb"); break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) case 2: __put_user_asm_goto(x, ptr, label, "sth"); break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) case 4: __put_user_asm_goto(x, ptr, label, "stw"); break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) case 8: __put_user_asm2_goto(x, ptr, label); break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) default: __put_user_bad(); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) #define __put_user_nocheck_goto(x, ptr, size, label) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) __chk_user_ptr(ptr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) __put_user_size_goto((x), __pu_addr, (size), label); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) extern long __get_user_bad(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) * This does an atomic 128 byte aligned load from userspace.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) * Upto caller to do enable_kernel_vmx() before calling!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) #define __get_user_atomic_128_aligned(kaddr, uaddr, err) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) __asm__ __volatile__( \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) ".machine push\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) ".machine altivec\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) "1: lvx 0,0,%1 # get user\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) " stvx 0,0,%2 # put kernel\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) ".machine pop\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) "2:\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) ".section .fixup,\"ax\"\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) "3: li %0,%3\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) " b 2b\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) ".previous\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) EX_TABLE(1b, 3b) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) : "=r" (err) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) : "b" (uaddr), "b" (kaddr), "i" (-EFAULT), "0" (err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) #define __get_user_asm(x, addr, err, op) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) __asm__ __volatile__( \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) "1: "op"%U2%X2 %1, %2 # get_user\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) "2:\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) ".section .fixup,\"ax\"\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) "3: li %0,%3\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) " li %1,0\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) " b 2b\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) ".previous\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) EX_TABLE(1b, 3b) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) : "=r" (err), "=r" (x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) : "m"UPD_CONSTR (*addr), "i" (-EFAULT), "0" (err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) #ifdef __powerpc64__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) #define __get_user_asm2(x, addr, err) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) __get_user_asm(x, addr, err, "ld")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) #else /* __powerpc64__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) #define __get_user_asm2(x, addr, err) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) __asm__ __volatile__( \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) "1: lwz%X2 %1, %2\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) "2: lwz%X2 %L1, %L2\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) "3:\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) ".section .fixup,\"ax\"\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) "4: li %0,%3\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) " li %1,0\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) " li %1+1,0\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) " b 3b\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) ".previous\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) EX_TABLE(1b, 4b) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) EX_TABLE(2b, 4b) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) : "=r" (err), "=&r" (x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) : "m" (*addr), "i" (-EFAULT), "0" (err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) #endif /* __powerpc64__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) #define __get_user_size_allowed(x, ptr, size, retval) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) retval = 0; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) __chk_user_ptr(ptr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) if (size > sizeof(x)) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) (x) = __get_user_bad(); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) switch (size) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) case 1: __get_user_asm(x, (u8 __user *)ptr, retval, "lbz"); break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) case 2: __get_user_asm(x, (u16 __user *)ptr, retval, "lhz"); break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) case 4: __get_user_asm(x, (u32 __user *)ptr, retval, "lwz"); break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) case 8: __get_user_asm2(x, (u64 __user *)ptr, retval); break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) default: (x) = __get_user_bad(); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) #define __get_user_size(x, ptr, size, retval) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) allow_read_from_user(ptr, size); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) __get_user_size_allowed(x, ptr, size, retval); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) prevent_read_from_user(ptr, size); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) * This is a type: either unsigned long, if the argument fits into
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) * that type, or otherwise unsigned long long.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) #define __long_type(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) #define __get_user_nocheck(x, ptr, size, do_allow) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) long __gu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) __long_type(*(ptr)) __gu_val; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) __typeof__(size) __gu_size = (size); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) __chk_user_ptr(__gu_addr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) if (do_allow && !is_kernel_addr((unsigned long)__gu_addr)) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) might_fault(); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) barrier_nospec(); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) if (do_allow) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) __get_user_size(__gu_val, __gu_addr, __gu_size, __gu_err); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) else \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) __get_user_size_allowed(__gu_val, __gu_addr, __gu_size, __gu_err); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) (x) = (__typeof__(*(ptr)))__gu_val; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) __gu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) #define __get_user_check(x, ptr, size) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) long __gu_err = -EFAULT; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) __long_type(*(ptr)) __gu_val = 0; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) __typeof__(size) __gu_size = (size); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) might_fault(); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) if (access_ok(__gu_addr, __gu_size)) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) barrier_nospec(); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) __get_user_size(__gu_val, __gu_addr, __gu_size, __gu_err); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) (x) = (__force __typeof__(*(ptr)))__gu_val; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) __gu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) #define __get_user_nosleep(x, ptr, size) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) long __gu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) __long_type(*(ptr)) __gu_val; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) __typeof__(size) __gu_size = (size); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) __chk_user_ptr(__gu_addr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) barrier_nospec(); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) __get_user_size(__gu_val, __gu_addr, __gu_size, __gu_err); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) (x) = (__force __typeof__(*(ptr)))__gu_val; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) __gu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) /* more complex routines */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) extern unsigned long __copy_tofrom_user(void __user *to,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) const void __user *from, unsigned long size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) #ifdef CONFIG_ARCH_HAS_COPY_MC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) unsigned long __must_check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) copy_mc_generic(void *to, const void *from, unsigned long size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) static inline unsigned long __must_check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) copy_mc_to_kernel(void *to, const void *from, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) return copy_mc_generic(to, from, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) #define copy_mc_to_kernel copy_mc_to_kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) static inline unsigned long __must_check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) copy_mc_to_user(void __user *to, const void *from, unsigned long n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) if (likely(check_copy_size(from, n, true))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) if (access_ok(to, n)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) allow_write_to_user(to, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) n = copy_mc_generic((void *)to, from, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) prevent_write_to_user(to, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) #ifdef __powerpc64__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) static inline unsigned long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) raw_copy_in_user(void __user *to, const void __user *from, unsigned long n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) unsigned long ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) barrier_nospec();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) allow_read_write_user(to, from, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) ret = __copy_tofrom_user(to, from, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) prevent_read_write_user(to, from, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) #endif /* __powerpc64__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) static inline unsigned long raw_copy_from_user(void *to,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) const void __user *from, unsigned long n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) unsigned long ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) if (__builtin_constant_p(n) && (n <= 8)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) switch (n) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) barrier_nospec();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) __get_user_size(*(u8 *)to, from, 1, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) barrier_nospec();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) __get_user_size(*(u16 *)to, from, 2, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) case 4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) barrier_nospec();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) __get_user_size(*(u32 *)to, from, 4, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) case 8:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) barrier_nospec();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) __get_user_size(*(u64 *)to, from, 8, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) if (ret == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) barrier_nospec();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) allow_read_from_user(from, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) ret = __copy_tofrom_user((__force void __user *)to, from, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) prevent_read_from_user(from, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) static inline unsigned long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) raw_copy_to_user_allowed(void __user *to, const void *from, unsigned long n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) if (__builtin_constant_p(n) && (n <= 8)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) unsigned long ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) switch (n) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) __put_user_size_allowed(*(u8 *)from, (u8 __user *)to, 1, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) __put_user_size_allowed(*(u16 *)from, (u16 __user *)to, 2, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) case 4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) __put_user_size_allowed(*(u32 *)from, (u32 __user *)to, 4, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) case 8:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) __put_user_size_allowed(*(u64 *)from, (u64 __user *)to, 8, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) if (ret == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) return __copy_tofrom_user(to, (__force const void __user *)from, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) static inline unsigned long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) raw_copy_to_user(void __user *to, const void *from, unsigned long n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) unsigned long ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) allow_write_to_user(to, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) ret = raw_copy_to_user_allowed(to, from, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) prevent_write_to_user(to, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) unsigned long __arch_clear_user(void __user *addr, unsigned long size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) static inline unsigned long clear_user(void __user *addr, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) unsigned long ret = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) might_fault();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) if (likely(access_ok(addr, size))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) allow_write_to_user(addr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) ret = __arch_clear_user(addr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) prevent_write_to_user(addr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) static inline unsigned long __clear_user(void __user *addr, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) return clear_user(addr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) extern long strncpy_from_user(char *dst, const char __user *src, long count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) extern __must_check long strnlen_user(const char __user *str, long n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) extern long __copy_from_user_flushcache(void *dst, const void __user *src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) unsigned size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) extern void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) size_t len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) static __must_check inline bool user_access_begin(const void __user *ptr, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) if (unlikely(!access_ok(ptr, len)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) might_fault();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) allow_read_write_user((void __user *)ptr, ptr, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) #define user_access_begin user_access_begin
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) #define user_access_end prevent_current_access_user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) #define user_access_save prevent_user_access_return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) #define user_access_restore restore_user_access
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) static __must_check inline bool
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) user_read_access_begin(const void __user *ptr, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) if (unlikely(!access_ok(ptr, len)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) might_fault();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) allow_read_from_user(ptr, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) #define user_read_access_begin user_read_access_begin
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) #define user_read_access_end prevent_current_read_from_user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) static __must_check inline bool
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) user_write_access_begin(const void __user *ptr, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) if (unlikely(!access_ok(ptr, len)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) might_fault();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) allow_write_to_user((void __user *)ptr, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) #define user_write_access_begin user_write_access_begin
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) #define user_write_access_end prevent_current_write_to_user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) #define unsafe_op_wrap(op, err) do { if (unlikely(op)) goto err; } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) #define unsafe_get_user(x, p, e) unsafe_op_wrap(__get_user_allowed(x, p), e)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) #define unsafe_put_user(x, p, e) __put_user_goto(x, p, e)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) #define unsafe_copy_to_user(d, s, l, e) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) u8 __user *_dst = (u8 __user *)(d); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) const u8 *_src = (const u8 *)(s); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) size_t _len = (l); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) int _i; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) for (_i = 0; _i < (_len & ~(sizeof(long) - 1)); _i += sizeof(long)) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) __put_user_goto(*(long*)(_src + _i), (long __user *)(_dst + _i), e);\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) if (IS_ENABLED(CONFIG_PPC64) && (_len & 4)) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) __put_user_goto(*(u32*)(_src + _i), (u32 __user *)(_dst + _i), e); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) _i += 4; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) if (_len & 2) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) __put_user_goto(*(u16*)(_src + _i), (u16 __user *)(_dst + _i), e); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) _i += 2; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) if (_len & 1) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) __put_user_goto(*(u8*)(_src + _i), (u8 __user *)(_dst + _i), e);\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) #define HAVE_GET_KERNEL_NOFAULT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) #define __get_kernel_nofault(dst, src, type, err_label) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) int __kr_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) __get_user_size_allowed(*((type *)(dst)), (__force type __user *)(src),\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) sizeof(type), __kr_err); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) if (unlikely(__kr_err)) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) goto err_label; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) #define __put_kernel_nofault(dst, src, type, err_label) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) __put_user_size_goto(*((type *)(src)), \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) (__force type __user *)(dst), sizeof(type), err_label)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) #endif /* _ARCH_POWERPC_UACCESS_H */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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