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4b842e4e25
Very few call sites where that would be triggered remain, and none of those is anywhere near hot enough to bother. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_UACCESS_64_H
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#define _ASM_X86_UACCESS_64_H
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/*
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* User space memory access functions
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*/
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#include <linux/compiler.h>
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#include <linux/lockdep.h>
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#include <linux/kasan-checks.h>
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#include <asm/alternative.h>
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#include <asm/cpufeatures.h>
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#include <asm/page.h>
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/*
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* Copy To/From Userspace
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*/
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/* Handles exceptions in both to and from, but doesn't do access_ok */
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__must_check unsigned long
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copy_user_enhanced_fast_string(void *to, const void *from, unsigned len);
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__must_check unsigned long
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copy_user_generic_string(void *to, const void *from, unsigned len);
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__must_check unsigned long
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copy_user_generic_unrolled(void *to, const void *from, unsigned len);
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static __always_inline __must_check unsigned long
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copy_user_generic(void *to, const void *from, unsigned len)
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{
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unsigned ret;
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/*
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* If CPU has ERMS feature, use copy_user_enhanced_fast_string.
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* Otherwise, if CPU has rep_good feature, use copy_user_generic_string.
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* Otherwise, use copy_user_generic_unrolled.
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*/
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alternative_call_2(copy_user_generic_unrolled,
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copy_user_generic_string,
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X86_FEATURE_REP_GOOD,
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copy_user_enhanced_fast_string,
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X86_FEATURE_ERMS,
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ASM_OUTPUT2("=a" (ret), "=D" (to), "=S" (from),
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"=d" (len)),
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"1" (to), "2" (from), "3" (len)
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: "memory", "rcx", "r8", "r9", "r10", "r11");
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return ret;
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}
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static __always_inline __must_check unsigned long
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copy_to_user_mcsafe(void *to, const void *from, unsigned len)
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{
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unsigned long ret;
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__uaccess_begin();
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/*
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* Note, __memcpy_mcsafe() is explicitly used since it can
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* handle exceptions / faults. memcpy_mcsafe() may fall back to
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* memcpy() which lacks this handling.
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*/
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ret = __memcpy_mcsafe(to, from, len);
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__uaccess_end();
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return ret;
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}
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static __always_inline __must_check unsigned long
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raw_copy_from_user(void *dst, const void __user *src, unsigned long size)
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{
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return copy_user_generic(dst, (__force void *)src, size);
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}
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static __always_inline __must_check unsigned long
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raw_copy_to_user(void __user *dst, const void *src, unsigned long size)
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{
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return copy_user_generic((__force void *)dst, src, size);
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}
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static __always_inline __must_check
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unsigned long raw_copy_in_user(void __user *dst, const void __user *src, unsigned long size)
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{
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return copy_user_generic((__force void *)dst,
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(__force void *)src, size);
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}
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extern long __copy_user_nocache(void *dst, const void __user *src,
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unsigned size, int zerorest);
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extern long __copy_user_flushcache(void *dst, const void __user *src, unsigned size);
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extern void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
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size_t len);
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static inline int
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__copy_from_user_inatomic_nocache(void *dst, const void __user *src,
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unsigned size)
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{
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kasan_check_write(dst, size);
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return __copy_user_nocache(dst, src, size, 0);
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}
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static inline int
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__copy_from_user_flushcache(void *dst, const void __user *src, unsigned size)
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{
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kasan_check_write(dst, size);
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return __copy_user_flushcache(dst, src, size);
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}
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unsigned long
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mcsafe_handle_tail(char *to, char *from, unsigned len);
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#endif /* _ASM_X86_UACCESS_64_H */
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