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96d4f267e4
Nobody has actually used the type (VERIFY_READ vs VERIFY_WRITE) argument
of the user address range verification function since we got rid of the
old racy i386-only code to walk page tables by hand.
It existed because the original 80386 would not honor the write protect
bit when in kernel mode, so you had to do COW by hand before doing any
user access. But we haven't supported that in a long time, and these
days the 'type' argument is a purely historical artifact.
A discussion about extending 'user_access_begin()' to do the range
checking resulted this patch, because there is no way we're going to
move the old VERIFY_xyz interface to that model. And it's best done at
the end of the merge window when I've done most of my merges, so let's
just get this done once and for all.
This patch was mostly done with a sed-script, with manual fix-ups for
the cases that weren't of the trivial 'access_ok(VERIFY_xyz' form.
There were a couple of notable cases:
- csky still had the old "verify_area()" name as an alias.
- the iter_iov code had magical hardcoded knowledge of the actual
values of VERIFY_{READ,WRITE} (not that they mattered, since nothing
really used it)
- microblaze used the type argument for a debug printout
but other than those oddities this should be a total no-op patch.
I tried to fix up all architectures, did fairly extensive grepping for
access_ok() uses, and the changes are trivial, but I may have missed
something. Any missed conversion should be trivially fixable, though.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
210 lines
5.1 KiB
C
210 lines
5.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_SH_CHECKSUM_H
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#define __ASM_SH_CHECKSUM_H
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/*
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* Copyright (C) 1999 by Kaz Kojima & Niibe Yutaka
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*/
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#include <linux/in6.h>
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/*
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* computes the checksum of a memory block at buff, length len,
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* and adds in "sum" (32-bit)
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*
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* returns a 32-bit number suitable for feeding into itself
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* or csum_tcpudp_magic
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*
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* this function must be called with even lengths, except
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* for the last fragment, which may be odd
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*
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* it's best to have buff aligned on a 32-bit boundary
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*/
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asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum);
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/*
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* the same as csum_partial, but copies from src while it
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* checksums, and handles user-space pointer exceptions correctly, when needed.
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*
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* here even more important to align src and dst on a 32-bit (or even
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* better 64-bit) boundary
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*/
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asmlinkage __wsum csum_partial_copy_generic(const void *src, void *dst,
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int len, __wsum sum,
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int *src_err_ptr, int *dst_err_ptr);
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/*
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* Note: when you get a NULL pointer exception here this means someone
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* passed in an incorrect kernel address to one of these functions.
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*
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* If you use these functions directly please don't forget the
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* access_ok().
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*/
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static inline
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__wsum csum_partial_copy_nocheck(const void *src, void *dst,
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int len, __wsum sum)
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{
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return csum_partial_copy_generic(src, dst, len, sum, NULL, NULL);
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}
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static inline
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__wsum csum_partial_copy_from_user(const void __user *src, void *dst,
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int len, __wsum sum, int *err_ptr)
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{
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return csum_partial_copy_generic((__force const void *)src, dst,
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len, sum, err_ptr, NULL);
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}
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/*
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* Fold a partial checksum
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*/
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static inline __sum16 csum_fold(__wsum sum)
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{
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unsigned int __dummy;
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__asm__("swap.w %0, %1\n\t"
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"extu.w %0, %0\n\t"
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"extu.w %1, %1\n\t"
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"add %1, %0\n\t"
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"swap.w %0, %1\n\t"
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"add %1, %0\n\t"
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"not %0, %0\n\t"
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: "=r" (sum), "=&r" (__dummy)
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: "0" (sum)
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: "t");
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return (__force __sum16)sum;
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}
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/*
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* This is a version of ip_compute_csum() optimized for IP headers,
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* which always checksum on 4 octet boundaries.
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*
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* i386 version by Jorge Cwik <jorge@laser.satlink.net>, adapted
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* for linux by * Arnt Gulbrandsen.
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*/
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static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
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{
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unsigned int sum, __dummy0, __dummy1;
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__asm__ __volatile__(
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"mov.l @%1+, %0\n\t"
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"mov.l @%1+, %3\n\t"
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"add #-2, %2\n\t"
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"clrt\n\t"
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"1:\t"
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"addc %3, %0\n\t"
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"movt %4\n\t"
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"mov.l @%1+, %3\n\t"
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"dt %2\n\t"
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"bf/s 1b\n\t"
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" cmp/eq #1, %4\n\t"
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"addc %3, %0\n\t"
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"addc %2, %0" /* Here %2 is 0, add carry-bit */
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/* Since the input registers which are loaded with iph and ihl
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are modified, we must also specify them as outputs, or gcc
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will assume they contain their original values. */
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: "=r" (sum), "=r" (iph), "=r" (ihl), "=&r" (__dummy0), "=&z" (__dummy1)
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: "1" (iph), "2" (ihl)
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: "t", "memory");
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return csum_fold(sum);
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}
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static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
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__u32 len, __u8 proto,
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__wsum sum)
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{
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#ifdef __LITTLE_ENDIAN__
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unsigned long len_proto = (proto + len) << 8;
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#else
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unsigned long len_proto = proto + len;
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#endif
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__asm__("clrt\n\t"
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"addc %0, %1\n\t"
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"addc %2, %1\n\t"
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"addc %3, %1\n\t"
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"movt %0\n\t"
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"add %1, %0"
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: "=r" (sum), "=r" (len_proto)
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: "r" (daddr), "r" (saddr), "1" (len_proto), "0" (sum)
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: "t");
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return sum;
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}
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/*
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* computes the checksum of the TCP/UDP pseudo-header
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* returns a 16-bit checksum, already complemented
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*/
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static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
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__u32 len, __u8 proto,
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__wsum sum)
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{
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return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
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}
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/*
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* this routine is used for miscellaneous IP-like checksums, mainly
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* in icmp.c
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*/
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static inline __sum16 ip_compute_csum(const void *buff, int len)
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{
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return csum_fold(csum_partial(buff, len, 0));
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}
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#define _HAVE_ARCH_IPV6_CSUM
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static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
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const struct in6_addr *daddr,
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__u32 len, __u8 proto, __wsum sum)
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{
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unsigned int __dummy;
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__asm__("clrt\n\t"
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"mov.l @(0,%2), %1\n\t"
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"addc %1, %0\n\t"
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"mov.l @(4,%2), %1\n\t"
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"addc %1, %0\n\t"
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"mov.l @(8,%2), %1\n\t"
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"addc %1, %0\n\t"
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"mov.l @(12,%2), %1\n\t"
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"addc %1, %0\n\t"
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"mov.l @(0,%3), %1\n\t"
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"addc %1, %0\n\t"
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"mov.l @(4,%3), %1\n\t"
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"addc %1, %0\n\t"
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"mov.l @(8,%3), %1\n\t"
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"addc %1, %0\n\t"
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"mov.l @(12,%3), %1\n\t"
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"addc %1, %0\n\t"
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"addc %4, %0\n\t"
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"addc %5, %0\n\t"
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"movt %1\n\t"
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"add %1, %0\n"
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: "=r" (sum), "=&r" (__dummy)
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: "r" (saddr), "r" (daddr),
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"r" (htonl(len)), "r" (htonl(proto)), "0" (sum)
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: "t");
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return csum_fold(sum);
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}
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/*
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* Copy and checksum to user
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*/
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#define HAVE_CSUM_COPY_USER
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static inline __wsum csum_and_copy_to_user(const void *src,
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void __user *dst,
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int len, __wsum sum,
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int *err_ptr)
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{
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if (access_ok(dst, len))
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return csum_partial_copy_generic((__force const void *)src,
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dst, len, sum, NULL, err_ptr);
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if (len)
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*err_ptr = -EFAULT;
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return (__force __wsum)-1; /* invalid checksum */
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}
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#endif /* __ASM_SH_CHECKSUM_H */
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