disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/arch/x86/lib/csum-wrappers_64.c
..
..
@@ -1,6 +1,6 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright 2002, 2003 Andi Kleen, SuSE Labs.
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- * Subject to the GNU Public License v.2
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  *
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  * Wrappers of assembly checksum functions for x86-64.
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  */
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@@ -10,7 +10,7 @@
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 #include <asm/smap.h>
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11
 
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 /**
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- * csum_partial_copy_from_user - Copy and checksum from user space.
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+ * csum_and_copy_from_user - Copy and checksum from user space.
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  * @src: source address (user space)
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  * @dst: destination address
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  * @len: number of bytes to be copied.
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@@ -21,57 +21,21 @@
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  * src and dst are best aligned to 64bits.
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  */
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 __wsum
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-csum_partial_copy_from_user(const void __user *src, void *dst,
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-			    int len, __wsum isum, int *errp)
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+csum_and_copy_from_user(const void __user *src, void *dst, int len)
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 {
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+	__wsum sum;
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+
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 	might_sleep();
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-	*errp = 0;
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-
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-	if (!likely(access_ok(VERIFY_READ, src, len)))
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-		goto out_err;
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-
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-	/*
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-	 * Why 6, not 7? To handle odd addresses aligned we
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-	 * would need to do considerable complications to fix the
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-	 * checksum which is defined as an 16bit accumulator. The
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-	 * fix alignment code is primarily for performance
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-	 * compatibility with 32bit and that will handle odd
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-	 * addresses slowly too.
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-	 */
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-	if (unlikely((unsigned long)src & 6)) {
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-		while (((unsigned long)src & 6) && len >= 2) {
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-			__u16 val16;
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-
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-			if (__get_user(val16, (const __u16 __user *)src))
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-				goto out_err;
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-
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-			*(__u16 *)dst = val16;
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-			isum = (__force __wsum)add32_with_carry(
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-					(__force unsigned)isum, val16);
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-			src += 2;
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-			dst += 2;
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-			len -= 2;
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-		}
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-	}
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-	stac();
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-	isum = csum_partial_copy_generic((__force const void *)src,
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-				dst, len, isum, errp, NULL);
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-	clac();
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-	if (unlikely(*errp))
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-		goto out_err;
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-
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-	return isum;
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-
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-out_err:
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-	*errp = -EFAULT;
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-	memset(dst, 0, len);
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-
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-	return isum;
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+	if (!user_access_begin(src, len))
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+		return 0;
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+	sum = csum_partial_copy_generic((__force const void *)src, dst, len);
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+	user_access_end();
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+	return sum;
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 }
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-EXPORT_SYMBOL(csum_partial_copy_from_user);
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+EXPORT_SYMBOL(csum_and_copy_from_user);
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36
 
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 /**
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- * csum_partial_copy_to_user - Copy and checksum to user space.
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+ * csum_and_copy_to_user - Copy and checksum to user space.
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  * @src: source address
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  * @dst: destination address (user space)
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  * @len: number of bytes to be copied.
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@@ -82,41 +46,18 @@
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  * src and dst are best aligned to 64bits.
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  */
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 __wsum
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-csum_partial_copy_to_user(const void *src, void __user *dst,
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-			  int len, __wsum isum, int *errp)
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+csum_and_copy_to_user(const void *src, void __user *dst, int len)
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 {
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-	__wsum ret;
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+	__wsum sum;
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 	might_sleep();
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-
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-	if (unlikely(!access_ok(VERIFY_WRITE, dst, len))) {
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-		*errp = -EFAULT;
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+	if (!user_access_begin(dst, len))
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 		return 0;
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-	}
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-
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-	if (unlikely((unsigned long)dst & 6)) {
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-		while (((unsigned long)dst & 6) && len >= 2) {
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-			__u16 val16 = *(__u16 *)src;
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-
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-			isum = (__force __wsum)add32_with_carry(
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-					(__force unsigned)isum, val16);
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-			*errp = __put_user(val16, (__u16 __user *)dst);
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-			if (*errp)
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-				return isum;
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-			src += 2;
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-			dst += 2;
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-			len -= 2;
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-		}
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-	}
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-
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-	*errp = 0;
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-	stac();
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-	ret = csum_partial_copy_generic(src, (void __force *)dst,
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-					len, isum, NULL, errp);
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-	clac();
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-	return ret;
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+	sum = csum_partial_copy_generic(src, (void __force *)dst, len);
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+	user_access_end();
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+	return sum;
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 }
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-EXPORT_SYMBOL(csum_partial_copy_to_user);
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+EXPORT_SYMBOL(csum_and_copy_to_user);
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61
 
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 /**
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  * csum_partial_copy_nocheck - Copy and checksum.
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@@ -128,9 +69,9 @@
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  * Returns an 32bit unfolded checksum of the buffer.
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  */
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 __wsum
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-csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
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+csum_partial_copy_nocheck(const void *src, void *dst, int len)
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 {
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-	return csum_partial_copy_generic(src, dst, len, sum, NULL, NULL);
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+	return csum_partial_copy_generic(src, dst, len);
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 }
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 EXPORT_SYMBOL(csum_partial_copy_nocheck);
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