| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Russell King | 776 | 57.87% | 19 | 38.78% |
| Linus Torvalds (pre-git) | 138 | 10.29% | 3 | 6.12% |
| Julien Thierry | 74 | 5.52% | 3 | 6.12% |
| Victor Kamensky | 57 | 4.25% | 1 | 2.04% |
| Kees Cook | 52 | 3.88% | 2 | 4.08% |
| Daniel R Thompson | 47 | 3.50% | 1 | 2.04% |
| Vincent Whitchurch | 44 | 3.28% | 1 | 2.04% |
| Nico Pitre | 39 | 2.91% | 2 | 4.08% |
| Linus Torvalds | 33 | 2.46% | 1 | 2.04% |
| Al Viro | 32 | 2.39% | 3 | 6.12% |
| Will Deacon | 21 | 1.57% | 2 | 4.08% |
| Michael S. Tsirkin | 7 | 0.52% | 2 | 4.08% |
| Christoph Hellwig | 6 | 0.45% | 1 | 2.04% |
| Ingo Molnar | 4 | 0.30% | 1 | 2.04% |
| Stefan Agner | 2 | 0.15% | 2 | 4.08% |
| Thomas Gleixner | 2 | 0.15% | 1 | 2.04% |
| Masahiro Yamada | 2 | 0.15% | 1 | 2.04% |
| David Howells | 2 | 0.15% | 1 | 2.04% |
| Catalin Marinas | 2 | 0.15% | 1 | 2.04% |
| Ard Biesheuvel | 1 | 0.07% | 1 | 2.04% |
| Total | 1341 | 49 |
/* SPDX-License-Identifier: GPL-2.0-only */ /* * arch/arm/include/asm/uaccess.h */ #ifndef _ASMARM_UACCESS_H #define _ASMARM_UACCESS_H /* * User space memory access functions */ #include <linux/string.h> #include <asm/memory.h> #include <asm/domain.h> #include <asm/unified.h> #include <asm/compiler.h> #include <asm/extable.h> /* * These two functions allow hooking accesses to userspace to increase * system integrity by ensuring that the kernel can not inadvertantly * perform such accesses (eg, via list poison values) which could then * be exploited for priviledge escalation. */ static __always_inline unsigned int uaccess_save_and_enable(void) { #ifdef CONFIG_CPU_SW_DOMAIN_PAN unsigned int old_domain = get_domain(); /* Set the current domain access to permit user accesses */ set_domain((old_domain & ~domain_mask(DOMAIN_USER)) | domain_val(DOMAIN_USER, DOMAIN_CLIENT)); return old_domain; #else return 0; #endif } static __always_inline void uaccess_restore(unsigned int flags) { #ifdef CONFIG_CPU_SW_DOMAIN_PAN /* Restore the user access mask */ set_domain(flags); #endif } /* * 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 #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; /* * Prevent a mispredicted conditional call to set_fs from forwarding * the wrong address limit to access_ok under speculation. */ dsb(nsh); isb(); modify_domain(DOMAIN_KERNEL, fs ? DOMAIN_CLIENT : DOMAIN_MANAGER); } #define uaccess_kernel() (get_fs() == KERNEL_DS) /* * We use 33-bit arithmetic here. Success returns zero, failure returns * addr_limit. We take advantage that addr_limit will be zero for KERNEL_DS, * so this will always return success in that case. */ #define __range_ok(addr, size) ({ \ unsigned long flag, roksum; \ __chk_user_ptr(addr); \ __asm__(".syntax unified\n" \ "adds %1, %2, %3; sbcscc %1, %1, %0; movcc %0, #0" \ : "=&r" (flag), "=&r" (roksum) \ : "r" (addr), "Ir" (size), "0" (current_thread_info()->addr_limit) \ : "cc"); \ flag; }) /* * This is a type: either unsigned long, if the argument fits into * that type, or otherwise unsigned long long. */ #define __inttype(x) \ __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL)) /* * Sanitise a uaccess pointer such that it becomes NULL if addr+size * is above the current addr_limit. */ #define uaccess_mask_range_ptr(ptr, size) \ ((__typeof__(ptr))__uaccess_mask_range_ptr(ptr, size)) static inline void __user *__uaccess_mask_range_ptr(const void __user *ptr, size_t size) { void __user *safe_ptr = (void __user *)ptr; unsigned long tmp; asm volatile( " .syntax unified\n" " sub %1, %3, #1\n" " subs %1, %1, %0\n" " addhs %1, %1, #1\n" " subshs %1, %1, %2\n" " movlo %0, #0\n" : "+r" (safe_ptr), "=&r" (tmp) : "r" (size), "r" (current_thread_info()->addr_limit) : "cc"); csdb(); return safe_ptr; } /* * 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 *); extern int __get_user_32t_8(void *); extern int __get_user_8(void *); extern int __get_user_64t_1(void *); extern int __get_user_64t_2(void *); extern int __get_user_64t_4(void *); #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 __GUP_CLOBBER_32t_8 "lr", "cc" #define __GUP_CLOBBER_8 "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) /* narrowing a double-word get into a single 32bit word register: */ #ifdef __ARMEB__ #define __get_user_x_32t(__r2, __p, __e, __l, __s) \ __get_user_x(__r2, __p, __e, __l, 32t_8) #else #define __get_user_x_32t __get_user_x #endif /* * storing result into proper least significant word of 64bit target var, * different only for big endian case where 64 bit __r2 lsw is r3: */ #ifdef __ARMEB__ #define __get_user_x_64t(__r2, __p, __e, __l, __s) \ __asm__ __volatile__ ( \ __asmeq("%0", "r0") __asmeq("%1", "r2") \ __asmeq("%3", "r1") \ "bl __get_user_64t_" #__s \ : "=&r" (__e), "=r" (__r2) \ : "0" (__p), "r" (__l) \ : __GUP_CLOBBER_##__s) #else #define __get_user_x_64t __get_user_x #endif #define __get_user_check(x, p) \ ({ \ unsigned long __limit = current_thread_info()->addr_limit - 1; \ register typeof(*(p)) __user *__p asm("r0") = (p); \ register __inttype(x) __r2 asm("r2"); \ register unsigned long __l asm("r1") = __limit; \ register int __e asm("r0"); \ unsigned int __ua_flags = uaccess_save_and_enable(); \ switch (sizeof(*(__p))) { \ case 1: \ if (sizeof((x)) >= 8) \ __get_user_x_64t(__r2, __p, __e, __l, 1); \ else \ __get_user_x(__r2, __p, __e, __l, 1); \ break; \ case 2: \ if (sizeof((x)) >= 8) \ __get_user_x_64t(__r2, __p, __e, __l, 2); \ else \ __get_user_x(__r2, __p, __e, __l, 2); \ break; \ case 4: \ if (sizeof((x)) >= 8) \ __get_user_x_64t(__r2, __p, __e, __l, 4); \ else \ __get_user_x(__r2, __p, __e, __l, 4); \ break; \ case 8: \ if (sizeof((x)) < 8) \ __get_user_x_32t(__r2, __p, __e, __l, 4); \ else \ __get_user_x(__r2, __p, __e, __l, 8); \ break; \ default: __e = __get_user_bad(); break; \ } \ uaccess_restore(__ua_flags); \ x = (typeof(*(p))) __r2; \ __e; \ }) #define get_user(x, p) \ ({ \ might_fault(); \ __get_user_check(x, p); \ }) 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); #define __put_user_check(__pu_val, __ptr, __err, __s) \ ({ \ unsigned long __limit = current_thread_info()->addr_limit - 1; \ register typeof(__pu_val) __r2 asm("r2") = __pu_val; \ register const void __user *__p asm("r0") = __ptr; \ register unsigned long __l asm("r1") = __limit; \ register int __e asm("r0"); \ __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"); \ __err = __e; \ }) #else /* CONFIG_MMU */ /* * uClinux has only one addr space, so has simplified address limits. */ #define USER_DS KERNEL_DS #define uaccess_kernel() (true) #define __addr_ok(addr) ((void)(addr), 1) #define __range_ok(addr, size) ((void)(addr), 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_check __put_user_nocheck #endif /* CONFIG_MMU */ #define access_ok(addr, size) (__range_ok(addr, size) == 0) #define user_addr_max() \ (uaccess_kernel() ? ~0UL : get_fs()) #ifdef CONFIG_CPU_SPECTRE /* * When mitigating Spectre variant 1, it is not worth fixing the non- * verifying accessors, because we need to add verification of the * address space there. Force these to use the standard get_user() * version instead. */ #define __get_user(x, ptr) get_user(x, ptr) #else /* * 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_err(x, ptr, err) \ do { \ unsigned long __gu_addr = (unsigned long)(ptr); \ unsigned long __gu_val; \ unsigned int __ua_flags; \ __chk_user_ptr(ptr); \ might_fault(); \ __ua_flags = uaccess_save_and_enable(); \ 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(); \ } \ uaccess_restore(__ua_flags); \ (x) = (__typeof__(*(ptr)))__gu_val; \ } while (0) #define __get_user_asm(x, addr, err, instr) \ __asm__ __volatile__( \ "1: " TUSER(instr) " %1, [%2], #0\n" \ "2:\n" \ " .pushsection .text.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 __get_user_asm_byte(x, addr, err) \ __get_user_asm(x, addr, err, ldrb) #if __LINUX_ARM_ARCH__ >= 6 #define __get_user_asm_half(x, addr, err) \ __get_user_asm(x, addr, err, ldrh) #else #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 #endif /* __LINUX_ARM_ARCH__ >= 6 */ #define __get_user_asm_word(x, addr, err) \ __get_user_asm(x, addr, err, ldr) #endif #define __put_user_switch(x, ptr, __err, __fn) \ do { \ const __typeof__(*(ptr)) __user *__pu_ptr = (ptr); \ __typeof__(*(ptr)) __pu_val = (x); \ unsigned int __ua_flags; \ might_fault(); \ __ua_flags = uaccess_save_and_enable(); \ switch (sizeof(*(ptr))) { \ case 1: __fn(__pu_val, __pu_ptr, __err, 1); break; \ case 2: __fn(__pu_val, __pu_ptr, __err, 2); break; \ case 4: __fn(__pu_val, __pu_ptr, __err, 4); break; \ case 8: __fn(__pu_val, __pu_ptr, __err, 8); break; \ default: __err = __put_user_bad(); break; \ } \ uaccess_restore(__ua_flags); \ } while (0) #define put_user(x, ptr) \ ({ \ int __pu_err = 0; \ __put_user_switch((x), (ptr), __pu_err, __put_user_check); \ __pu_err; \ }) #ifdef CONFIG_CPU_SPECTRE /* * When mitigating Spectre variant 1.1, all accessors need to include * verification of the address space. */ #define __put_user(x, ptr) put_user(x, ptr) #else #define __put_user(x, ptr) \ ({ \ long __pu_err = 0; \ __put_user_switch((x), (ptr), __pu_err, __put_user_nocheck); \ __pu_err; \ }) #define __put_user_nocheck(x, __pu_ptr, __err, __size) \ do { \ unsigned long __pu_addr = (unsigned long)__pu_ptr; \ __put_user_nocheck_##__size(x, __pu_addr, __err); \ } while (0) #define __put_user_nocheck_1 __put_user_asm_byte #define __put_user_nocheck_2 __put_user_asm_half #define __put_user_nocheck_4 __put_user_asm_word #define __put_user_nocheck_8 __put_user_asm_dword #define __put_user_asm(x, __pu_addr, err, instr) \ __asm__ __volatile__( \ "1: " TUSER(instr) " %1, [%2], #0\n" \ "2:\n" \ " .pushsection .text.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") #define __put_user_asm_byte(x, __pu_addr, err) \ __put_user_asm(x, __pu_addr, err, strb) #if __LINUX_ARM_ARCH__ >= 6 #define __put_user_asm_half(x, __pu_addr, err) \ __put_user_asm(x, __pu_addr, err, strh) #else #ifndef __ARMEB__ #define __put_user_asm_half(x, __pu_addr, err) \ ({ \ unsigned long __temp = (__force 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 = (__force unsigned long)(x); \ __put_user_asm_byte(__temp >> 8, __pu_addr, err); \ __put_user_asm_byte(__temp, __pu_addr + 1, err); \ }) #endif #endif /* __LINUX_ARM_ARCH__ >= 6 */ #define __put_user_asm_word(x, __pu_addr, err) \ __put_user_asm(x, __pu_addr, err, str) #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 .text.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") #endif /* !CONFIG_CPU_SPECTRE */ #ifdef CONFIG_MMU extern unsigned long __must_check arm_copy_from_user(void *to, const void __user *from, unsigned long n); static inline unsigned long __must_check raw_copy_from_user(void *to, const void __user *from, unsigned long n) { unsigned int __ua_flags; __ua_flags = uaccess_save_and_enable(); n = arm_copy_from_user(to, from, n); uaccess_restore(__ua_flags); return n; } extern unsigned long __must_check arm_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); static inline unsigned long __must_check raw_copy_to_user(void __user *to, const void *from, unsigned long n) { #ifndef CONFIG_UACCESS_WITH_MEMCPY unsigned int __ua_flags; __ua_flags = uaccess_save_and_enable(); n = arm_copy_to_user(to, from, n); uaccess_restore(__ua_flags); return n; #else return arm_copy_to_user(to, from, n); #endif } extern unsigned long __must_check arm_clear_user(void __user *addr, unsigned long n); extern unsigned long __must_check __clear_user_std(void __user *addr, unsigned long n); static inline unsigned long __must_check __clear_user(void __user *addr, unsigned long n) { unsigned int __ua_flags = uaccess_save_and_enable(); n = arm_clear_user(addr, n); uaccess_restore(__ua_flags); return n; } #else static inline unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n) { memcpy(to, (const void __force *)from, n); return 0; } static inline unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n) { memcpy((void __force *)to, from, n); return 0; } #define __clear_user(addr, n) (memset((void __force *)addr, 0, n), 0) #endif #define INLINE_COPY_TO_USER #define INLINE_COPY_FROM_USER static inline unsigned long __must_check clear_user(void __user *to, unsigned long n) { if (access_ok(to, n)) n = __clear_user(to, n); return n; } /* These are from lib/ code, and use __get_user() and friends */ extern long strncpy_from_user(char *dest, const char __user *src, long count); extern __must_check long strnlen_user(const char __user *str, long n); #endif /* _ASMARM_UACCESS_H */
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