diff options
Diffstat (limited to 'arch/powerpc/include/asm/uaccess.h')
| -rw-r--r-- | arch/powerpc/include/asm/uaccess.h | 389 |
1 files changed, 171 insertions, 218 deletions
diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h index 78e2a3990eab..a09e4240c5b1 100644 --- a/arch/powerpc/include/asm/uaccess.h +++ b/arch/powerpc/include/asm/uaccess.h @@ -43,129 +43,39 @@ static inline bool __access_ok(unsigned long addr, unsigned long size) * exception handling means that it's no longer "just"...) * */ -#define get_user(x, ptr) \ - __get_user_check((x), (ptr), sizeof(*(ptr))) -#define put_user(x, ptr) \ - __put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) - -#define __get_user(x, ptr) \ - __get_user_nocheck((x), (ptr), sizeof(*(ptr)), true) -#define __put_user(x, ptr) \ - __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) - -#define __get_user_allowed(x, ptr) \ - __get_user_nocheck((x), (ptr), sizeof(*(ptr)), false) - -#define __get_user_inatomic(x, ptr) \ - __get_user_nosleep((x), (ptr), sizeof(*(ptr))) -#define __put_user_inatomic(x, ptr) \ - __put_user_nosleep((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr))) - -#ifdef CONFIG_PPC64 - -#define ___get_user_instr(gu_op, dest, ptr) \ -({ \ - long __gui_ret = 0; \ - unsigned long __gui_ptr = (unsigned long)ptr; \ - struct ppc_inst __gui_inst; \ - unsigned int __prefix, __suffix; \ - __gui_ret = gu_op(__prefix, (unsigned int __user *)__gui_ptr); \ - if (__gui_ret == 0) { \ - if ((__prefix >> 26) == OP_PREFIX) { \ - __gui_ret = gu_op(__suffix, \ - (unsigned int __user *)__gui_ptr + 1); \ - __gui_inst = ppc_inst_prefix(__prefix, \ - __suffix); \ - } else { \ - __gui_inst = ppc_inst(__prefix); \ - } \ - if (__gui_ret == 0) \ - (dest) = __gui_inst; \ - } \ - __gui_ret; \ -}) - -#define get_user_instr(x, ptr) \ - ___get_user_instr(get_user, x, ptr) - -#define __get_user_instr(x, ptr) \ - ___get_user_instr(__get_user, x, ptr) - -#define __get_user_instr_inatomic(x, ptr) \ - ___get_user_instr(__get_user_inatomic, x, ptr) - -#else /* !CONFIG_PPC64 */ -#define get_user_instr(x, ptr) \ - get_user((x).val, (u32 __user *)(ptr)) - -#define __get_user_instr(x, ptr) \ - __get_user_nocheck((x).val, (u32 __user *)(ptr), sizeof(u32), true) - -#define __get_user_instr_inatomic(x, ptr) \ - __get_user_nosleep((x).val, (u32 __user *)(ptr), sizeof(u32)) - -#endif /* CONFIG_PPC64 */ - -extern long __put_user_bad(void); - -#define __put_user_size(x, ptr, size, retval) \ -do { \ - __label__ __pu_failed; \ - \ - retval = 0; \ - allow_write_to_user(ptr, size); \ - __put_user_size_goto(x, ptr, size, __pu_failed); \ - prevent_write_to_user(ptr, size); \ - break; \ - \ -__pu_failed: \ - retval = -EFAULT; \ - prevent_write_to_user(ptr, size); \ -} while (0) - -#define __put_user_nocheck(x, ptr, size) \ +#define __put_user(x, ptr) \ ({ \ long __pu_err; \ __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ - __typeof__(*(ptr)) __pu_val = (x); \ - __typeof__(size) __pu_size = (size); \ + __typeof__(*(ptr)) __pu_val = (__typeof__(*(ptr)))(x); \ + __typeof__(sizeof(*(ptr))) __pu_size = sizeof(*(ptr)); \ \ - if (!is_kernel_addr((unsigned long)__pu_addr)) \ - might_fault(); \ - __chk_user_ptr(__pu_addr); \ - __put_user_size(__pu_val, __pu_addr, __pu_size, __pu_err); \ + might_fault(); \ + do { \ + __label__ __pu_failed; \ + \ + allow_write_to_user(__pu_addr, __pu_size); \ + __put_user_size_goto(__pu_val, __pu_addr, __pu_size, __pu_failed); \ + prevent_write_to_user(__pu_addr, __pu_size); \ + __pu_err = 0; \ + break; \ + \ +__pu_failed: \ + prevent_write_to_user(__pu_addr, __pu_size); \ + __pu_err = -EFAULT; \ + } while (0); \ \ __pu_err; \ }) -#define __put_user_check(x, ptr, size) \ +#define put_user(x, ptr) \ ({ \ - long __pu_err = -EFAULT; \ - __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ - __typeof__(*(ptr)) __pu_val = (x); \ - __typeof__(size) __pu_size = (size); \ - \ - might_fault(); \ - if (access_ok(__pu_addr, __pu_size)) \ - __put_user_size(__pu_val, __pu_addr, __pu_size, __pu_err); \ + __typeof__(*(ptr)) __user *_pu_addr = (ptr); \ \ - __pu_err; \ + access_ok(_pu_addr, sizeof(*(ptr))) ? \ + __put_user(x, _pu_addr) : -EFAULT; \ }) -#define __put_user_nosleep(x, ptr, size) \ -({ \ - long __pu_err; \ - __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ - __typeof__(*(ptr)) __pu_val = (x); \ - __typeof__(size) __pu_size = (size); \ - \ - __chk_user_ptr(__pu_addr); \ - __put_user_size(__pu_val, __pu_addr, __pu_size, __pu_err); \ - \ - __pu_err; \ -}) - - /* * We don't tell gcc that we are accessing memory, but this is OK * because we do not write to any memory gcc knows about, so there @@ -198,25 +108,17 @@ __pu_failed: \ #define __put_user_size_goto(x, ptr, size, label) \ do { \ + __typeof__(*(ptr)) __user *__pus_addr = (ptr); \ + \ switch (size) { \ - case 1: __put_user_asm_goto(x, ptr, label, "stb"); break; \ - case 2: __put_user_asm_goto(x, ptr, label, "sth"); break; \ - case 4: __put_user_asm_goto(x, ptr, label, "stw"); break; \ - case 8: __put_user_asm2_goto(x, ptr, label); break; \ - default: __put_user_bad(); \ + case 1: __put_user_asm_goto(x, __pus_addr, label, "stb"); break; \ + case 2: __put_user_asm_goto(x, __pus_addr, label, "sth"); break; \ + case 4: __put_user_asm_goto(x, __pus_addr, label, "stw"); break; \ + case 8: __put_user_asm2_goto(x, __pus_addr, label); break; \ + default: BUILD_BUG(); \ } \ } while (0) -#define __unsafe_put_user_goto(x, ptr, size, label) \ -do { \ - __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ - __chk_user_ptr(ptr); \ - __put_user_size_goto((x), __pu_addr, (size), label); \ -} while (0) - - -extern long __get_user_bad(void); - /* * This does an atomic 128 byte aligned load from userspace. * Upto caller to do enable_kernel_vmx() before calling! @@ -234,6 +136,59 @@ extern long __get_user_bad(void); : "=r" (err) \ : "b" (uaddr), "b" (kaddr), "i" (-EFAULT), "0" (err)) +#ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT + +#define __get_user_asm_goto(x, addr, label, op) \ + asm_volatile_goto( \ + "1: "op"%U1%X1 %0, %1 # get_user\n" \ + EX_TABLE(1b, %l2) \ + : "=r" (x) \ + : "m"UPD_CONSTR (*addr) \ + : \ + : label) + +#ifdef __powerpc64__ +#define __get_user_asm2_goto(x, addr, label) \ + __get_user_asm_goto(x, addr, label, "ld") +#else /* __powerpc64__ */ +#define __get_user_asm2_goto(x, addr, label) \ + asm_volatile_goto( \ + "1: lwz%X1 %0, %1\n" \ + "2: lwz%X1 %L0, %L1\n" \ + EX_TABLE(1b, %l2) \ + EX_TABLE(2b, %l2) \ + : "=r" (x) \ + : "m" (*addr) \ + : \ + : label) +#endif /* __powerpc64__ */ + +#define __get_user_size_goto(x, ptr, size, label) \ +do { \ + BUILD_BUG_ON(size > sizeof(x)); \ + switch (size) { \ + case 1: __get_user_asm_goto(x, (u8 __user *)ptr, label, "lbz"); break; \ + case 2: __get_user_asm_goto(x, (u16 __user *)ptr, label, "lhz"); break; \ + case 4: __get_user_asm_goto(x, (u32 __user *)ptr, label, "lwz"); break; \ + case 8: __get_user_asm2_goto(x, (u64 __user *)ptr, label); break; \ + default: x = 0; BUILD_BUG(); \ + } \ +} while (0) + +#define __get_user_size_allowed(x, ptr, size, retval) \ +do { \ + __label__ __gus_failed; \ + \ + __get_user_size_goto(x, ptr, size, __gus_failed); \ + retval = 0; \ + break; \ +__gus_failed: \ + x = 0; \ + retval = -EFAULT; \ +} while (0) + +#else /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */ + #define __get_user_asm(x, addr, err, op) \ __asm__ __volatile__( \ "1: "op"%U2%X2 %1, %2 # get_user\n" \ @@ -271,25 +226,27 @@ extern long __get_user_bad(void); #define __get_user_size_allowed(x, ptr, size, retval) \ do { \ retval = 0; \ - __chk_user_ptr(ptr); \ - if (size > sizeof(x)) \ - (x) = __get_user_bad(); \ + BUILD_BUG_ON(size > sizeof(x)); \ switch (size) { \ case 1: __get_user_asm(x, (u8 __user *)ptr, retval, "lbz"); break; \ case 2: __get_user_asm(x, (u16 __user *)ptr, retval, "lhz"); break; \ case 4: __get_user_asm(x, (u32 __user *)ptr, retval, "lwz"); break; \ case 8: __get_user_asm2(x, (u64 __user *)ptr, retval); break; \ - default: (x) = __get_user_bad(); \ + default: x = 0; BUILD_BUG(); \ } \ } while (0) -#define __get_user_size(x, ptr, size, retval) \ +#define __get_user_size_goto(x, ptr, size, label) \ do { \ - allow_read_from_user(ptr, size); \ - __get_user_size_allowed(x, ptr, size, retval); \ - prevent_read_from_user(ptr, size); \ + long __gus_retval; \ + \ + __get_user_size_allowed(x, ptr, size, __gus_retval); \ + if (__gus_retval) \ + goto label; \ } while (0) +#endif /* CONFIG_CC_HAS_ASM_GOTO_OUTPUT */ + /* * This is a type: either unsigned long, if the argument fits into * that type, or otherwise unsigned long long. @@ -297,86 +254,36 @@ do { \ #define __long_type(x) \ __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL)) -#define __get_user_nocheck(x, ptr, size, do_allow) \ +#define __get_user(x, ptr) \ ({ \ long __gu_err; \ __long_type(*(ptr)) __gu_val; \ __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ - __typeof__(size) __gu_size = (size); \ + __typeof__(sizeof(*(ptr))) __gu_size = sizeof(*(ptr)); \ \ - __chk_user_ptr(__gu_addr); \ - if (do_allow && !is_kernel_addr((unsigned long)__gu_addr)) \ - might_fault(); \ - if (do_allow) \ - __get_user_size(__gu_val, __gu_addr, __gu_size, __gu_err); \ - else \ - __get_user_size_allowed(__gu_val, __gu_addr, __gu_size, __gu_err); \ + might_fault(); \ + allow_read_from_user(__gu_addr, __gu_size); \ + __get_user_size_allowed(__gu_val, __gu_addr, __gu_size, __gu_err); \ + prevent_read_from_user(__gu_addr, __gu_size); \ (x) = (__typeof__(*(ptr)))__gu_val; \ \ __gu_err; \ }) -#define __get_user_check(x, ptr, size) \ +#define get_user(x, ptr) \ ({ \ - long __gu_err = -EFAULT; \ - __long_type(*(ptr)) __gu_val = 0; \ - __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ - __typeof__(size) __gu_size = (size); \ - \ - might_fault(); \ - if (access_ok(__gu_addr, __gu_size)) \ - __get_user_size(__gu_val, __gu_addr, __gu_size, __gu_err); \ - (x) = (__force __typeof__(*(ptr)))__gu_val; \ + __typeof__(*(ptr)) __user *_gu_addr = (ptr); \ \ - __gu_err; \ + access_ok(_gu_addr, sizeof(*(ptr))) ? \ + __get_user(x, _gu_addr) : \ + ((x) = (__force __typeof__(*(ptr)))0, -EFAULT); \ }) -#define __get_user_nosleep(x, ptr, size) \ -({ \ - long __gu_err; \ - __long_type(*(ptr)) __gu_val; \ - __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ - __typeof__(size) __gu_size = (size); \ - \ - __chk_user_ptr(__gu_addr); \ - __get_user_size(__gu_val, __gu_addr, __gu_size, __gu_err); \ - (x) = (__force __typeof__(*(ptr)))__gu_val; \ - \ - __gu_err; \ -}) - - /* more complex routines */ extern unsigned long __copy_tofrom_user(void __user *to, const void __user *from, unsigned long size); -#ifdef CONFIG_ARCH_HAS_COPY_MC -unsigned long __must_check -copy_mc_generic(void *to, const void *from, unsigned long size); - -static inline unsigned long __must_check -copy_mc_to_kernel(void *to, const void *from, unsigned long size) -{ - return copy_mc_generic(to, from, size); -} -#define copy_mc_to_kernel copy_mc_to_kernel - -static inline unsigned long __must_check -copy_mc_to_user(void __user *to, const void *from, unsigned long n) -{ - if (likely(check_copy_size(from, n, true))) { - if (access_ok(to, n)) { - allow_write_to_user(to, n); - n = copy_mc_generic((void *)to, from, n); - prevent_write_to_user(to, n); - } - } - - return n; -} -#endif - #ifdef __powerpc64__ static inline unsigned long raw_copy_in_user(void __user *to, const void __user *from, unsigned long n) @@ -414,26 +321,51 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long n) unsigned long __arch_clear_user(void __user *addr, unsigned long size); -static inline unsigned long clear_user(void __user *addr, unsigned long size) +static inline unsigned long __clear_user(void __user *addr, unsigned long size) { - unsigned long ret = size; + unsigned long ret; + might_fault(); - if (likely(access_ok(addr, size))) { - allow_write_to_user(addr, size); - ret = __arch_clear_user(addr, size); - prevent_write_to_user(addr, size); - } + allow_write_to_user(addr, size); + ret = __arch_clear_user(addr, size); + prevent_write_to_user(addr, size); return ret; } -static inline unsigned long __clear_user(void __user *addr, unsigned long size) +static inline unsigned long clear_user(void __user *addr, unsigned long size) { - return clear_user(addr, size); + return likely(access_ok(addr, size)) ? __clear_user(addr, size) : size; } extern long strncpy_from_user(char *dst, const char __user *src, long count); extern __must_check long strnlen_user(const char __user *str, long n); +#ifdef CONFIG_ARCH_HAS_COPY_MC +unsigned long __must_check +copy_mc_generic(void *to, const void *from, unsigned long size); + +static inline unsigned long __must_check +copy_mc_to_kernel(void *to, const void *from, unsigned long size) +{ + return copy_mc_generic(to, from, size); +} +#define copy_mc_to_kernel copy_mc_to_kernel + +static inline unsigned long __must_check +copy_mc_to_user(void __user *to, const void *from, unsigned long n) +{ + if (likely(check_copy_size(from, n, true))) { + if (access_ok(to, n)) { + allow_write_to_user(to, n); + n = copy_mc_generic((void *)to, from, n); + prevent_write_to_user(to, n); + } + } + + return n; +} +#endif + extern long __copy_from_user_flushcache(void *dst, const void __user *src, unsigned size); extern void memcpy_page_flushcache(char *to, struct page *page, size_t offset, @@ -482,10 +414,37 @@ user_write_access_begin(const void __user *ptr, size_t len) #define user_write_access_begin user_write_access_begin #define user_write_access_end prevent_current_write_to_user -#define unsafe_op_wrap(op, err) do { if (unlikely(op)) goto err; } while (0) -#define unsafe_get_user(x, p, e) unsafe_op_wrap(__get_user_allowed(x, p), e) +#define unsafe_get_user(x, p, e) do { \ + __long_type(*(p)) __gu_val; \ + __typeof__(*(p)) __user *__gu_addr = (p); \ + \ + __get_user_size_goto(__gu_val, __gu_addr, sizeof(*(p)), e); \ + (x) = (__typeof__(*(p)))__gu_val; \ +} while (0) + #define unsafe_put_user(x, p, e) \ - __unsafe_put_user_goto((__typeof__(*(p)))(x), (p), sizeof(*(p)), e) + __put_user_size_goto((__typeof__(*(p)))(x), (p), sizeof(*(p)), e) + +#define unsafe_copy_from_user(d, s, l, e) \ +do { \ + u8 *_dst = (u8 *)(d); \ + const u8 __user *_src = (const u8 __user *)(s); \ + size_t _len = (l); \ + int _i; \ + \ + for (_i = 0; _i < (_len & ~(sizeof(u64) - 1)); _i += sizeof(u64)) \ + unsafe_get_user(*(u64 *)(_dst + _i), (u64 __user *)(_src + _i), e); \ + if (_len & 4) { \ + unsafe_get_user(*(u32 *)(_dst + _i), (u32 __user *)(_src + _i), e); \ + _i += 4; \ + } \ + if (_len & 2) { \ + unsafe_get_user(*(u16 *)(_dst + _i), (u16 __user *)(_src + _i), e); \ + _i += 2; \ + } \ + if (_len & 1) \ + unsafe_get_user(*(u8 *)(_dst + _i), (u8 __user *)(_src + _i), e); \ +} while (0) #define unsafe_copy_to_user(d, s, l, e) \ do { \ @@ -494,9 +453,9 @@ do { \ size_t _len = (l); \ int _i; \ \ - for (_i = 0; _i < (_len & ~(sizeof(long) - 1)); _i += sizeof(long)) \ - unsafe_put_user(*(long*)(_src + _i), (long __user *)(_dst + _i), e); \ - if (IS_ENABLED(CONFIG_PPC64) && (_len & 4)) { \ + for (_i = 0; _i < (_len & ~(sizeof(u64) - 1)); _i += sizeof(u64)) \ + unsafe_put_user(*(u64 *)(_src + _i), (u64 __user *)(_dst + _i), e); \ + if (_len & 4) { \ unsafe_put_user(*(u32*)(_src + _i), (u32 __user *)(_dst + _i), e); \ _i += 4; \ } \ @@ -511,14 +470,8 @@ do { \ #define HAVE_GET_KERNEL_NOFAULT #define __get_kernel_nofault(dst, src, type, err_label) \ -do { \ - int __kr_err; \ - \ - __get_user_size_allowed(*((type *)(dst)), (__force type __user *)(src),\ - sizeof(type), __kr_err); \ - if (unlikely(__kr_err)) \ - goto err_label; \ -} while (0) + __get_user_size_goto(*((type *)(dst)), \ + (__force type __user *)(src), sizeof(type), err_label) #define __put_kernel_nofault(dst, src, type, err_label) \ __put_user_size_goto(*((type *)(src)), \ |