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Code Issues Releases Wiki Activity

x86: switch both 32bit and 64bit to providing csum_and_copy_from_user() 

... rather than messing with the wrapper.  As a side effect,
32bit variant gets access_ok() into it and can be switched to
user_access_begin()/user_access_end()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-02-16 16:50:00 -05:00
parent 73e800ecb6
commit 0a5ea224b2
4 changed files with 14 additions and 13 deletions
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1
arch/x86/include/asm/checksum.h
View File

@ -1,4 +1,5 @@
/* SPDX-License-Identifier: GPL-2.0 */
#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER 1
#ifdef CONFIG_X86_32
# include <asm/checksum_32.h>
#else

15
arch/x86/include/asm/checksum_32.h
View File

@ -44,18 +44,21 @@ static inline __wsum csum_partial_copy_nocheck(const void *src, void *dst,
return csum_partial_copy_generic(src, dst, len, sum, NULL, NULL);
}
static inline __wsum csum_partial_copy_from_user(const void __user *src,
void *dst,
int len, __wsum sum,
int *err_ptr)
static inline __wsum csum_and_copy_from_user(const void __user *src,
void *dst, int len,
__wsum sum, int *err_ptr)
{
__wsum ret;
might_sleep();
stac();
if (!user_access_begin(src, len)) {
if (len)
*err_ptr = -EFAULT;
return sum;
}
ret = csum_partial_copy_generic((__force void *)src, dst,
len, sum, err_ptr, NULL);
clac();
user_access_end();
return ret;
}

5
arch/x86/include/asm/checksum_64.h
View File

@ -129,7 +129,6 @@ static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
*/
extern __wsum csum_partial(const void *buff, int len, __wsum sum);
#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER 1
#define HAVE_CSUM_COPY_USER 1
@ -139,15 +138,13 @@ extern __visible __wsum csum_partial_copy_generic(const void *src, const void *d
int *src_err_ptr, int *dst_err_ptr);
extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
extern __wsum csum_and_copy_from_user(const void __user *src, void *dst,
int len, __wsum isum, int *errp);
extern __wsum csum_and_copy_to_user(const void *src, void __user *dst,
int len, __wsum isum, int *errp);
extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
int len, __wsum sum);
#define csum_and_copy_from_user csum_partial_copy_from_user
/**
* ip_compute_csum - Compute an 16bit IP checksum.
* @buff: buffer address.

6
arch/x86/lib/csum-wrappers_64.c
View File

@ -10,7 +10,7 @@
#include <asm/smap.h>
/**
* csum_partial_copy_from_user - Copy and checksum from user space.
* csum_and_copy_from_user - Copy and checksum from user space.
* @src: source address (user space)
* @dst: destination address
* @len: number of bytes to be copied.
@ -21,7 +21,7 @@
* src and dst are best aligned to 64bits.
*/
__wsum
csum_partial_copy_from_user(const void __user *src, void *dst,
csum_and_copy_from_user(const void __user *src, void *dst,
int len, __wsum isum, int *errp)
{
might_sleep();
@ -68,7 +68,7 @@ out_err:
return isum;
}
EXPORT_SYMBOL(csum_partial_copy_from_user);
EXPORT_SYMBOL(csum_and_copy_from_user);
/**
* csum_and_copy_to_user - Copy and checksum to user space.