diff options
Diffstat (limited to 'arch/arm64/include/asm/uaccess.h')
| -rw-r--r-- | arch/arm64/include/asm/uaccess.h | 96 |
1 files changed, 13 insertions, 83 deletions
diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index 5308d696311b..7b8a04789cef 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -28,38 +28,12 @@ #include <linux/bitops.h> #include <linux/kasan-checks.h> #include <linux/string.h> -#include <linux/thread_info.h> #include <asm/cpufeature.h> #include <asm/ptrace.h> -#include <asm/errno.h> #include <asm/memory.h> #include <asm/compiler.h> - -#define VERIFY_READ 0 -#define VERIFY_WRITE 1 - -/* - * The exception table consists of pairs of relative offsets: the first - * is the relative offset to an instruction that is allowed to fault, - * and the second is the relative offset at which the program should - * continue. No registers are modified, so it is entirely up to the - * continuation code to figure out what to do. - * - * All the routines below use bits of fixup code that are out of line - * with the main instruction path. This means when everything is well, - * we don't even have to jump over them. Further, they do not intrude - * on our cache or tlb entries. - */ - -struct exception_table_entry -{ - int insn, fixup; -}; - -#define ARCH_HAS_RELATIVE_EXTABLE - -extern int fixup_exception(struct pt_regs *regs); +#include <asm/extable.h> #define KERNEL_DS (-1UL) #define get_ds() (KERNEL_DS) @@ -95,20 +69,21 @@ static inline void set_fs(mm_segment_t fs) */ #define __range_ok(addr, size) \ ({ \ + unsigned long __addr = (unsigned long __force)(addr); \ unsigned long flag, roksum; \ __chk_user_ptr(addr); \ asm("adds %1, %1, %3; ccmp %1, %4, #2, cc; cset %0, ls" \ : "=&r" (flag), "=&r" (roksum) \ - : "1" (addr), "Ir" (size), \ + : "1" (__addr), "Ir" (size), \ "r" (current_thread_info()->addr_limit) \ : "cc"); \ flag; \ }) /* - * When dealing with data aborts or instruction traps we may end up with - * a tagged userland pointer. Clear the tag to get a sane pointer to pass - * on to access_ok(), for instance. + * When dealing with data aborts, watchpoints, or instruction traps we may end + * up with a tagged userland pointer. Clear the tag to get a sane pointer to + * pass on to access_ok(), for instance. */ #define untagged_addr(addr) sign_extend64(addr, 55) @@ -256,7 +231,7 @@ do { \ (err), ARM64_HAS_UAO); \ break; \ case 8: \ - __get_user_asm("ldr", "ldtr", "%", __gu_val, (ptr), \ + __get_user_asm("ldr", "ldtr", "%x", __gu_val, (ptr), \ (err), ARM64_HAS_UAO); \ break; \ default: \ @@ -323,7 +298,7 @@ do { \ (err), ARM64_HAS_UAO); \ break; \ case 8: \ - __put_user_asm("str", "sttr", "%", __pu_val, (ptr), \ + __put_user_asm("str", "sttr", "%x", __pu_val, (ptr), \ (err), ARM64_HAS_UAO); \ break; \ default: \ @@ -357,58 +332,13 @@ do { \ }) extern unsigned long __must_check __arch_copy_from_user(void *to, const void __user *from, unsigned long n); +#define raw_copy_from_user __arch_copy_from_user extern unsigned long __must_check __arch_copy_to_user(void __user *to, const void *from, unsigned long n); -extern unsigned long __must_check __copy_in_user(void __user *to, const void __user *from, unsigned long n); +#define raw_copy_to_user __arch_copy_to_user +extern unsigned long __must_check raw_copy_in_user(void __user *to, const void __user *from, unsigned long n); extern unsigned long __must_check __clear_user(void __user *addr, unsigned long n); - -static inline unsigned long __must_check __copy_from_user(void *to, const void __user *from, unsigned long n) -{ - kasan_check_write(to, n); - check_object_size(to, n, false); - return __arch_copy_from_user(to, from, n); -} - -static inline unsigned long __must_check __copy_to_user(void __user *to, const void *from, unsigned long n) -{ - kasan_check_read(from, n); - check_object_size(from, n, true); - return __arch_copy_to_user(to, from, n); -} - -static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n) -{ - unsigned long res = n; - kasan_check_write(to, n); - check_object_size(to, n, false); - - if (access_ok(VERIFY_READ, from, n)) { - res = __arch_copy_from_user(to, from, n); - } - if (unlikely(res)) - memset(to + (n - res), 0, res); - return res; -} - -static inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n) -{ - kasan_check_read(from, n); - check_object_size(from, n, true); - - if (access_ok(VERIFY_WRITE, to, n)) { - n = __arch_copy_to_user(to, from, n); - } - return n; -} - -static inline unsigned long __must_check copy_in_user(void __user *to, const void __user *from, unsigned long n) -{ - if (access_ok(VERIFY_READ, from, n) && access_ok(VERIFY_WRITE, to, n)) - n = __copy_in_user(to, from, n); - return n; -} - -#define __copy_to_user_inatomic __copy_to_user -#define __copy_from_user_inatomic __copy_from_user +#define INLINE_COPY_TO_USER +#define INLINE_COPY_FROM_USER static inline unsigned long __must_check clear_user(void __user *to, unsigned long n) { |