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5de7bcaadf
Similarly to the previous commit, this renames the somewhat confusingly named function. But in this case, it was at least less confusing: the __copy_from_user_inatomic_nocache is indeed copying from user memory, and it is indeed ok to be used in an atomic context, so it will not warn about it. But the previous commit also removed the NTB mis-use of the __copy_from_user_inatomic_nocache() function, and as a result every call-site is now _actually_ doing a real user copy. That means that we can now do the proper user pointer verification too. End result: add proper address checking, remove the double underscores, and change the "nocache" to "nontemporal" to more accurately describe what this x86-only function actually does. It might be worth noting that only the target is non-temporal: the actual user accesses are normal memory accesses. Also worth noting is that non-x86 targets (and on older 32-bit x86 CPU's before XMM2 in the Pentium III) we end up just falling back on a regular user copy, so nothing can actually depend on the non-temporal semantics, but that has always been true. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
34 lines
1.0 KiB
C
34 lines
1.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_UACCESS_32_H
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#define _ASM_X86_UACCESS_32_H
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/*
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* User space memory access functions
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*/
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#include <linux/string.h>
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#include <asm/asm.h>
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#include <asm/page.h>
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unsigned long __must_check __copy_user_ll
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(void *to, const void *from, unsigned long n);
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unsigned long __must_check __copy_from_user_ll_nocache_nozero
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(void *to, const void __user *from, unsigned long n);
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static __always_inline unsigned long __must_check
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raw_copy_to_user(void __user *to, const void *from, unsigned long n)
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{
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return __copy_user_ll((__force void *)to, from, n);
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}
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static __always_inline unsigned long
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raw_copy_from_user(void *to, const void __user *from, unsigned long n)
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{
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return __copy_user_ll(to, (__force const void *)from, n);
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}
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unsigned long __must_check copy_from_user_inatomic_nontemporal(void *, const void __user *, unsigned long n);
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unsigned long __must_check clear_user(void __user *mem, unsigned long len);
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unsigned long __must_check __clear_user(void __user *mem, unsigned long len);
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#endif /* _ASM_X86_UACCESS_32_H */
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