add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/x86/lib/usercopy_64.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /* 
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  * User address space access functions.
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  *
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@@ -38,8 +39,8 @@
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 		"3:	lea 0(%[size1],%[size8],8),%[size8]\n"
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 		"	jmp 2b\n"
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 		".previous\n"
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-		_ASM_EXTABLE(0b,3b)
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-		_ASM_EXTABLE(1b,2b)
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+		_ASM_EXTABLE_UA(0b, 3b)
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+		_ASM_EXTABLE_UA(1b, 2b)
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 		: [size8] "=&c"(size), [dst] "=&D" (__d0)
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 		: [size1] "r"(size & 7), "[size8]" (size / 8), "[dst]"(addr));
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 	clac();
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@@ -49,52 +50,11 @@
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 unsigned long clear_user(void __user *to, unsigned long n)
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 {
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-	if (access_ok(VERIFY_WRITE, to, n))
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+	if (access_ok(to, n))
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 		return __clear_user(to, n);
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 	return n;
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 }
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 EXPORT_SYMBOL(clear_user);
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-
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-/*
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- * Try to copy last bytes and clear the rest if needed.
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- * Since protection fault in copy_from/to_user is not a normal situation,
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- * it is not necessary to optimize tail handling.
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- */
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-__visible unsigned long
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-copy_user_handle_tail(char *to, char *from, unsigned len)
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-{
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-	for (; len; --len, to++) {
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-		char c;
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-
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-		if (__get_user_nocheck(c, from++, sizeof(char)))
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-			break;
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-		if (__put_user_nocheck(c, to, sizeof(char)))
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-			break;
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-	}
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-	clac();
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-	return len;
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-}
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-
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-/*
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- * Similar to copy_user_handle_tail, probe for the write fault point,
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- * but reuse __memcpy_mcsafe in case a new read error is encountered.
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- * clac() is handled in _copy_to_iter_mcsafe().
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- */
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-__visible unsigned long
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-mcsafe_handle_tail(char *to, char *from, unsigned len)
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-{
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-	for (; len; --len, to++, from++) {
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-		/*
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-		 * Call the assembly routine back directly since
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-		 * memcpy_mcsafe() may silently fallback to memcpy.
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-		 */
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-		unsigned long rem = __memcpy_mcsafe(to, from, 1);
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-
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-		if (rem)
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-			break;
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-	}
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-	return len;
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-}
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 #ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
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 /**
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@@ -154,14 +114,14 @@
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 	return rc;
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 }
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-void memcpy_flushcache(void *_dst, const void *_src, size_t size)
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+void __memcpy_flushcache(void *_dst, const void *_src, size_t size)
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 {
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 	unsigned long dest = (unsigned long) _dst;
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 	unsigned long source = (unsigned long) _src;
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 	/* cache copy and flush to align dest */
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 	if (!IS_ALIGNED(dest, 8)) {
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-		unsigned len = min_t(unsigned, size, ALIGN(dest, 8) - dest);
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+		size_t len = min_t(size_t, size, ALIGN(dest, 8) - dest);
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 		memcpy((void *) dest, (void *) source, len);
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 		clean_cache_range((void *) dest, len);
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@@ -217,7 +177,7 @@
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 		clean_cache_range((void *) dest, size);
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 	}
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 }
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-EXPORT_SYMBOL_GPL(memcpy_flushcache);
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+EXPORT_SYMBOL_GPL(__memcpy_flushcache);
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 void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
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 		size_t len)