/* * arch/arm/include/asm/uaccess.h * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #ifndef _ASMARM_UACCESS_H #define _ASMARM_UACCESS_H /* * User space memory access functions */ #include #include #include #include #include #include #include #define VERIFY_READ 0 #define VERIFY_WRITE 1 /* * The exception table consists of pairs of addresses: the first is the * address of an instruction that is allowed to fault, and the second is * the address 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 { unsigned long insn, fixup; }; extern int fixup_exception(struct pt_regs *regs); /* * These two are intentionally not defined anywhere - if the kernel * code generates any references to them, that's a bug. */ extern int __get_user_bad(void); extern int __put_user_bad(void); /* * Note that this is actually 0x1,0000,0000 */ #define KERNEL_DS 0x00000000 #define get_ds() (KERNEL_DS) #ifdef CONFIG_MMU #define USER_DS TASK_SIZE #define get_fs() (current_thread_info()->addr_limit) static inline void set_fs(mm_segment_t fs) { current_thread_info()->addr_limit = fs; modify_domain(DOMAIN_KERNEL, fs ? DOMAIN_CLIENT : DOMAIN_MANAGER); } #define segment_eq(a,b) ((a) == (b)) #define __addr_ok(addr) ({ \ unsigned long flag; \ __asm__("cmp %2, %0; movlo %0, #0" \ : "=&r" (flag) \ : "0" (current_thread_info()->addr_limit), "r" (addr) \ : "cc"); \ (flag == 0); }) /* We use 33-bit arithmetic here... */ #define __range_ok(addr,size) ({ \ unsigned long flag, roksum; \ __chk_user_ptr(addr); \ __asm__("adds %1, %2, %3; sbcccs %1, %1, %0; movcc %0, #0" \ : "=&r" (flag), "=&r" (roksum) \ : "r" (addr), "Ir" (size), "0" (current_thread_info()->addr_limit) \ : "cc"); \ flag; }) /* * Single-value transfer routines. They automatically use the right * size if we just have the right pointer type. Note that the functions * which read from user space (*get_*) need to take care not to leak * kernel data even if the calling code is buggy and fails to check * the return value. This means zeroing out the destination variable * or buffer on error. Normally this is done out of line by the * fixup code, but there are a few places where it intrudes on the * main code path. When we only write to user space, there is no * problem. */ extern int __get_user_1(void *); extern int __get_user_2(void *); extern int __get_user_4(void *); // YJChen, 20131230, patch start for CTS android.security#testVroot #if 0 #define __get_user_x(__r2,__p,__e,__s,__i...) \ __asm__ __volatile__ ( \ __asmeq("%0", "r0") __asmeq("%1", "r2") \ "bl __get_user_" #__s \ : "=&r" (__e), "=r" (__r2) \ : "0" (__p) \ : __i, "cc") #define get_user(x,p) \ ({ \ register const typeof(*(p)) __user *__p asm("r0") = (p);\ register unsigned long __r2 asm("r2"); \ register int __e asm("r0"); \ switch (sizeof(*(__p))) { \ case 1: \ __get_user_x(__r2, __p, __e, 1, "lr"); \ break; \ case 2: \ __get_user_x(__r2, __p, __e, 2, "r3", "lr"); \ break; \ case 4: \ __get_user_x(__r2, __p, __e, 4, "lr"); \ break; \ default: __e = __get_user_bad(); break; \ } \ x = (typeof(*(p))) __r2; \ __e; \ }) #else #define __GUP_CLOBBER_1 "lr", "cc" #ifdef CONFIG_CPU_USE_DOMAINS #define __GUP_CLOBBER_2 "ip", "lr", "cc" #else #define __GUP_CLOBBER_2 "lr", "cc" #endif #define __GUP_CLOBBER_4 "lr", "cc" #define __get_user_x(__r2,__p,__e,__l,__s) \ __asm__ __volatile__ ( \ __asmeq("%0", "r0") __asmeq("%1", "r2") \ __asmeq("%3", "r1") \ "bl __get_user_" #__s \ : "=&r" (__e), "=r" (__r2) \ : "0" (__p), "r" (__l) \ : __GUP_CLOBBER_##__s) #if 0 #define get_user(x,p) \ ({ \ unsigned long __limit = current_thread_info()->addr_limit - 1; \ register const typeof(*(p)) __user *__p asm("r0") = (p); \ register unsigned long __r2 asm("r2"); \ register unsigned long __l asm("r1") = __limit; \ register int __e asm("r0"); \ switch (sizeof(*(__p))) { \ case 1: \ __get_user_x(__r2, __p, __e, __l, 1); \ break; \ case 2: \ __get_user_x(__r2, __p, __e, __l, 2); \ break; \ case 4: \ __get_user_x(__r2, __p, __e, __l, 4); \ break; \ default: __e = __get_user_bad(); break; \ } \ x = (typeof(*(p))) __r2; \ __e; \ }) #else #define __get_user_check(x,p) \ ({ \ unsigned long __limit = current_thread_info()->addr_limit - 1; \ register const typeof(*(p)) __user *__p asm("r0") = (p);\ register unsigned long __r2 asm("r2"); \ register unsigned long __l asm("r1") = __limit; \ register int __e asm("r0"); \ switch (sizeof(*(__p))) { \ case 1: \ __get_user_x(__r2, __p, __e, __l, 1); \ break; \ case 2: \ __get_user_x(__r2, __p, __e, __l, 2); \ break; \ case 4: \ __get_user_x(__r2, __p, __e, __l, 4); \ break; \ default: __e = __get_user_bad(); break; \ } \ x = (typeof(*(p))) __r2; \ __e; \ }) #define get_user(x,p) \ ({ \ might_fault(); \ __get_user_check(x,p); \ }) #endif #endif // YJChen, 20131230, patch end for CTS android.security#testVroot extern int __put_user_1(void *, unsigned int); extern int __put_user_2(void *, unsigned int); extern int __put_user_4(void *, unsigned int); extern int __put_user_8(void *, unsigned long long); // YJChen, 20131230, patch start for CTS android.security#testVroot #if 0 #define __put_user_x(__r2,__p,__e,__s) \ __asm__ __volatile__ ( \ __asmeq("%0", "r0") __asmeq("%2", "r2") \ "bl __put_user_" #__s \ : "=&r" (__e) \ : "0" (__p), "r" (__r2) \ : "ip", "lr", "cc") #define put_user(x,p) \ ({ \ register const typeof(*(p)) __r2 asm("r2") = (x); \ register const typeof(*(p)) __user *__p asm("r0") = (p);\ register int __e asm("r0"); \ switch (sizeof(*(__p))) { \ case 1: \ __put_user_x(__r2, __p, __e, 1); \ break; \ case 2: \ __put_user_x(__r2, __p, __e, 2); \ break; \ case 4: \ __put_user_x(__r2, __p, __e, 4); \ break; \ case 8: \ __put_user_x(__r2, __p, __e, 8); \ break; \ default: __e = __put_user_bad(); break; \ } \ __e; \ }) #else #define __put_user_x(__r2,__p,__e,__l,__s) \ __asm__ __volatile__ ( \ __asmeq("%0", "r0") __asmeq("%2", "r2") \ __asmeq("%3", "r1") \ "bl __put_user_" #__s \ : "=&r" (__e) \ : "0" (__p), "r" (__r2), "r" (__l) \ : "ip", "lr", "cc") #if 0 #if 1 #define put_user(x,p) \ ({ \ unsigned long __limit = current_thread_info()->addr_limit - 1; \ register const typeof(*(p)) __r2 asm("r2") = (x); \ register const typeof(*(p)) __user *__p asm("r0") = (p); \ register unsigned long __l asm("r1") = __limit; \ register int __e asm("r0"); \ switch (sizeof(*(__p))) { \ case 1: \ __put_user_x(__r2, __p, __e, __l, 1); \ break; \ case 2: \ __put_user_x(__r2, __p, __e, __l, 2); \ break; \ case 4: \ __put_user_x(__r2, __p, __e, __l, 4); \ break; \ case 8: \ __put_user_x(__r2, __p, __e, __l, 8); \ break; \ default: __e = __put_user_bad(); break; \ } \ __e; \ }) #else #define put_user(x,p) \ ({ \ unsigned long __limit = current_thread_info()->addr_limit - 1; \ register const typeof(*(p)) __r2 asm("r2") = (x); \ register const typeof(*(p)) __user *__p asm("r0") = (p); \ register unsigned long __l asm("r1") = __limit; \ register int __e asm("r0"); \ switch (sizeof(*(__p))) { \ case 1: \ if ((unsigned long)p+1 > __limit) \ dump_stack(); \ __put_user_x(__r2, __p, __e, __l, 1); \ break; \ case 2: \ if ((unsigned long)p+2 > __limit) \ dump_stack(); \ __put_user_x(__r2, __p, __e, __l, 2); \ break; \ case 4: \ if ((unsigned long)p+4 > __limit) \ dump_stack(); \ __put_user_x(__r2, __p, __e, __l, 4); \ break; \ case 8: \ if ((unsigned long)p+8 > __limit) \ dump_stack(); \ __put_user_x(__r2, __p, __e, __l, 8); \ break; \ default: __e = __put_user_bad(); break; \ } \ __e; \ }) #endif #else #define __put_user_check(x,p) \ ({ \ unsigned long __limit = current_thread_info()->addr_limit - 1; \ register const typeof(*(p)) __r2 asm("r2") = (x); \ register const typeof(*(p)) __user *__p asm("r0") = (p);\ register unsigned long __l asm("r1") = __limit; \ register int __e asm("r0"); \ switch (sizeof(*(__p))) { \ case 1: \ __put_user_x(__r2, __p, __e, __l, 1); \ break; \ case 2: \ __put_user_x(__r2, __p, __e, __l, 2); \ break; \ case 4: \ __put_user_x(__r2, __p, __e, __l, 4); \ break; \ case 8: \ __put_user_x(__r2, __p, __e, __l, 8); \ break; \ default: __e = __put_user_bad(); break; \ } \ __e; \ }) #define put_user(x,p) \ ({ \ might_fault(); \ __put_user_check(x,p); \ }) #endif #endif // YJChen, 20131230, patch end for CTS android.security#testVroot #else /* CONFIG_MMU */ /* * uClinux has only one addr space, so has simplified address limits. */ #define USER_DS KERNEL_DS #define segment_eq(a,b) (1) #define __addr_ok(addr) (1) #define __range_ok(addr,size) (0) #define get_fs() (KERNEL_DS) static inline void set_fs(mm_segment_t fs) { } #define get_user(x,p) __get_user(x,p) #define put_user(x,p) __put_user(x,p) #endif /* CONFIG_MMU */ #define access_ok(type,addr,size) (__range_ok(addr,size) == 0) /* * The "__xxx" versions of the user access functions do not verify the * address space - it must have been done previously with a separate * "access_ok()" call. * * The "xxx_error" versions set the third argument to EFAULT if an * error occurs, and leave it unchanged on success. Note that these * versions are void (ie, don't return a value as such). */ #define __get_user(x,ptr) \ ({ \ long __gu_err = 0; \ __get_user_err((x),(ptr),__gu_err); \ __gu_err; \ }) #define __get_user_error(x,ptr,err) \ ({ \ __get_user_err((x),(ptr),err); \ (void) 0; \ }) #define __get_user_err(x,ptr,err) \ do { \ unsigned long __gu_addr = (unsigned long)(ptr); \ unsigned long __gu_val; \ __chk_user_ptr(ptr); \ switch (sizeof(*(ptr))) { \ case 1: __get_user_asm_byte(__gu_val,__gu_addr,err); break; \ case 2: __get_user_asm_half(__gu_val,__gu_addr,err); break; \ case 4: __get_user_asm_word(__gu_val,__gu_addr,err); break; \ default: (__gu_val) = __get_user_bad(); \ } \ (x) = (__typeof__(*(ptr)))__gu_val; \ } while (0) #define __get_user_asm_byte(x,addr,err) \ __asm__ __volatile__( \ "1: " TUSER(ldrb) " %1,[%2],#0\n" \ "2:\n" \ " .pushsection .fixup,\"ax\"\n" \ " .align 2\n" \ "3: mov %0, %3\n" \ " mov %1, #0\n" \ " b 2b\n" \ " .popsection\n" \ " .pushsection __ex_table,\"a\"\n" \ " .align 3\n" \ " .long 1b, 3b\n" \ " .popsection" \ : "+r" (err), "=&r" (x) \ : "r" (addr), "i" (-EFAULT) \ : "cc") #ifndef __ARMEB__ #define __get_user_asm_half(x,__gu_addr,err) \ ({ \ unsigned long __b1, __b2; \ __get_user_asm_byte(__b1, __gu_addr, err); \ __get_user_asm_byte(__b2, __gu_addr + 1, err); \ (x) = __b1 | (__b2 << 8); \ }) #else #define __get_user_asm_half(x,__gu_addr,err) \ ({ \ unsigned long __b1, __b2; \ __get_user_asm_byte(__b1, __gu_addr, err); \ __get_user_asm_byte(__b2, __gu_addr + 1, err); \ (x) = (__b1 << 8) | __b2; \ }) #endif #define __get_user_asm_word(x,addr,err) \ __asm__ __volatile__( \ "1: " TUSER(ldr) " %1,[%2],#0\n" \ "2:\n" \ " .pushsection .fixup,\"ax\"\n" \ " .align 2\n" \ "3: mov %0, %3\n" \ " mov %1, #0\n" \ " b 2b\n" \ " .popsection\n" \ " .pushsection __ex_table,\"a\"\n" \ " .align 3\n" \ " .long 1b, 3b\n" \ " .popsection" \ : "+r" (err), "=&r" (x) \ : "r" (addr), "i" (-EFAULT) \ : "cc") #define __put_user(x,ptr) \ ({ \ long __pu_err = 0; \ __put_user_err((x),(ptr),__pu_err); \ __pu_err; \ }) #define __put_user_error(x,ptr,err) \ ({ \ __put_user_err((x),(ptr),err); \ (void) 0; \ }) #define __put_user_err(x,ptr,err) \ do { \ unsigned long __pu_addr = (unsigned long)(ptr); \ __typeof__(*(ptr)) __pu_val = (x); \ __chk_user_ptr(ptr); \ switch (sizeof(*(ptr))) { \ case 1: __put_user_asm_byte(__pu_val,__pu_addr,err); break; \ case 2: __put_user_asm_half(__pu_val,__pu_addr,err); break; \ case 4: __put_user_asm_word(__pu_val,__pu_addr,err); break; \ case 8: __put_user_asm_dword(__pu_val,__pu_addr,err); break; \ default: __put_user_bad(); \ } \ } while (0) #define __put_user_asm_byte(x,__pu_addr,err) \ __asm__ __volatile__( \ "1: " TUSER(strb) " %1,[%2],#0\n" \ "2:\n" \ " .pushsection .fixup,\"ax\"\n" \ " .align 2\n" \ "3: mov %0, %3\n" \ " b 2b\n" \ " .popsection\n" \ " .pushsection __ex_table,\"a\"\n" \ " .align 3\n" \ " .long 1b, 3b\n" \ " .popsection" \ : "+r" (err) \ : "r" (x), "r" (__pu_addr), "i" (-EFAULT) \ : "cc") #ifndef __ARMEB__ #define __put_user_asm_half(x,__pu_addr,err) \ ({ \ unsigned long __temp = (unsigned long)(x); \ __put_user_asm_byte(__temp, __pu_addr, err); \ __put_user_asm_byte(__temp >> 8, __pu_addr + 1, err); \ }) #else #define __put_user_asm_half(x,__pu_addr,err) \ ({ \ unsigned long __temp = (unsigned long)(x); \ __put_user_asm_byte(__temp >> 8, __pu_addr, err); \ __put_user_asm_byte(__temp, __pu_addr + 1, err); \ }) #endif #define __put_user_asm_word(x,__pu_addr,err) \ __asm__ __volatile__( \ "1: " TUSER(str) " %1,[%2],#0\n" \ "2:\n" \ " .pushsection .fixup,\"ax\"\n" \ " .align 2\n" \ "3: mov %0, %3\n" \ " b 2b\n" \ " .popsection\n" \ " .pushsection __ex_table,\"a\"\n" \ " .align 3\n" \ " .long 1b, 3b\n" \ " .popsection" \ : "+r" (err) \ : "r" (x), "r" (__pu_addr), "i" (-EFAULT) \ : "cc") #ifndef __ARMEB__ #define __reg_oper0 "%R2" #define __reg_oper1 "%Q2" #else #define __reg_oper0 "%Q2" #define __reg_oper1 "%R2" #endif #define __put_user_asm_dword(x,__pu_addr,err) \ __asm__ __volatile__( \ ARM( "1: " TUSER(str) " " __reg_oper1 ", [%1], #4\n" ) \ ARM( "2: " TUSER(str) " " __reg_oper0 ", [%1]\n" ) \ THUMB( "1: " TUSER(str) " " __reg_oper1 ", [%1]\n" ) \ THUMB( "2: " TUSER(str) " " __reg_oper0 ", [%1, #4]\n" ) \ "3:\n" \ " .pushsection .fixup,\"ax\"\n" \ " .align 2\n" \ "4: mov %0, %3\n" \ " b 3b\n" \ " .popsection\n" \ " .pushsection __ex_table,\"a\"\n" \ " .align 3\n" \ " .long 1b, 4b\n" \ " .long 2b, 4b\n" \ " .popsection" \ : "+r" (err), "+r" (__pu_addr) \ : "r" (x), "i" (-EFAULT) \ : "cc") #ifdef CONFIG_MMU extern unsigned long __must_check __copy_from_user(void *to, const void __user *from, unsigned long n); extern unsigned long __must_check __copy_to_user(void __user *to, const void *from, unsigned long n); extern unsigned long __must_check __copy_to_user_std(void __user *to, const void *from, unsigned long n); extern unsigned long __must_check __clear_user(void __user *addr, unsigned long n); extern unsigned long __must_check __clear_user_std(void __user *addr, unsigned long n); #else #define __copy_from_user(to,from,n) (memcpy(to, (void __force *)from, n), 0) #define __copy_to_user(to,from,n) (memcpy((void __force *)to, from, n), 0) #define __clear_user(addr,n) (memset((void __force *)addr, 0, n), 0) #endif extern unsigned long __must_check __strncpy_from_user(char *to, const char __user *from, unsigned long count); extern unsigned long __must_check __strnlen_user(const char __user *s, long n); static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n) { if (access_ok(VERIFY_READ, from, n)) n = __copy_from_user(to, from, n); else /* security hole - plug it */ memset(to, 0, n); return n; } static inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n) { if (access_ok(VERIFY_WRITE, to, n)) n = __copy_to_user(to, from, n); return n; } #define __copy_to_user_inatomic __copy_to_user #define __copy_from_user_inatomic __copy_from_user static inline unsigned long __must_check clear_user(void __user *to, unsigned long n) { if (access_ok(VERIFY_WRITE, to, n)) n = __clear_user(to, n); return n; } static inline long __must_check strncpy_from_user(char *dst, const char __user *src, long count) { long res = -EFAULT; if (access_ok(VERIFY_READ, src, 1)) res = __strncpy_from_user(dst, src, count); return res; } #define strlen_user(s) strnlen_user(s, ~0UL >> 1) static inline long __must_check strnlen_user(const char __user *s, long n) { unsigned long res = 0; if (__addr_ok(s)) res = __strnlen_user(s, n); return res; } #endif /* _ASMARM_UACCESS_H */