mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
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>
360 lines
10 KiB
C
360 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* User address space access functions.
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* The non inlined parts of asm-i386/uaccess.h are here.
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*
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* Copyright 1997 Andi Kleen <ak@muc.de>
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* Copyright 1997 Linus Torvalds
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*/
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#include <linux/export.h>
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#include <linux/uaccess.h>
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#include <asm/mmx.h>
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#include <asm/asm.h>
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#ifdef CONFIG_X86_INTEL_USERCOPY
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/*
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* Alignment at which movsl is preferred for bulk memory copies.
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*/
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struct movsl_mask movsl_mask __read_mostly;
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#endif
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static inline int __movsl_is_ok(unsigned long a1, unsigned long a2, unsigned long n)
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{
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#ifdef CONFIG_X86_INTEL_USERCOPY
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if (n >= 64 && ((a1 ^ a2) & movsl_mask.mask))
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return 0;
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#endif
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return 1;
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}
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#define movsl_is_ok(a1, a2, n) \
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__movsl_is_ok((unsigned long)(a1), (unsigned long)(a2), (n))
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/*
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* Zero Userspace
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*/
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#define __do_clear_user(addr,size) \
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do { \
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int __d0; \
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might_fault(); \
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__asm__ __volatile__( \
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ASM_STAC "\n" \
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"0: rep; stosl\n" \
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" movl %2,%0\n" \
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"1: rep; stosb\n" \
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"2: " ASM_CLAC "\n" \
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".section .fixup,\"ax\"\n" \
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"3: lea 0(%2,%0,4),%0\n" \
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" jmp 2b\n" \
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".previous\n" \
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_ASM_EXTABLE_UA(0b, 3b) \
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_ASM_EXTABLE_UA(1b, 2b) \
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: "=&c"(size), "=&D" (__d0) \
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: "r"(size & 3), "0"(size / 4), "1"(addr), "a"(0)); \
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} while (0)
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/**
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* clear_user: - Zero a block of memory in user space.
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* @to: Destination address, in user space.
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* @n: Number of bytes to zero.
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*
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* Zero a block of memory in user space.
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*
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* Returns number of bytes that could not be cleared.
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* On success, this will be zero.
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*/
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unsigned long
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clear_user(void __user *to, unsigned long n)
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{
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might_fault();
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if (access_ok(to, n))
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__do_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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* __clear_user: - Zero a block of memory in user space, with less checking.
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* @to: Destination address, in user space.
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* @n: Number of bytes to zero.
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*
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* Zero a block of memory in user space. Caller must check
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* the specified block with access_ok() before calling this function.
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*
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* Returns number of bytes that could not be cleared.
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* On success, this will be zero.
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*/
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unsigned long
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__clear_user(void __user *to, unsigned long n)
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{
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__do_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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#ifdef CONFIG_X86_INTEL_USERCOPY
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static unsigned long
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__copy_user_intel(void __user *to, const void *from, unsigned long size)
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{
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int d0, d1;
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__asm__ __volatile__(
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" .align 2,0x90\n"
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"1: movl 32(%4), %%eax\n"
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" cmpl $67, %0\n"
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" jbe 3f\n"
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"2: movl 64(%4), %%eax\n"
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" .align 2,0x90\n"
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"3: movl 0(%4), %%eax\n"
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"4: movl 4(%4), %%edx\n"
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"5: movl %%eax, 0(%3)\n"
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"6: movl %%edx, 4(%3)\n"
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"7: movl 8(%4), %%eax\n"
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"8: movl 12(%4),%%edx\n"
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"9: movl %%eax, 8(%3)\n"
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"10: movl %%edx, 12(%3)\n"
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"11: movl 16(%4), %%eax\n"
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"12: movl 20(%4), %%edx\n"
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"13: movl %%eax, 16(%3)\n"
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"14: movl %%edx, 20(%3)\n"
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"15: movl 24(%4), %%eax\n"
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"16: movl 28(%4), %%edx\n"
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"17: movl %%eax, 24(%3)\n"
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"18: movl %%edx, 28(%3)\n"
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"19: movl 32(%4), %%eax\n"
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"20: movl 36(%4), %%edx\n"
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"21: movl %%eax, 32(%3)\n"
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"22: movl %%edx, 36(%3)\n"
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"23: movl 40(%4), %%eax\n"
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"24: movl 44(%4), %%edx\n"
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"25: movl %%eax, 40(%3)\n"
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"26: movl %%edx, 44(%3)\n"
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"27: movl 48(%4), %%eax\n"
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"28: movl 52(%4), %%edx\n"
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"29: movl %%eax, 48(%3)\n"
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"30: movl %%edx, 52(%3)\n"
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"31: movl 56(%4), %%eax\n"
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"32: movl 60(%4), %%edx\n"
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"33: movl %%eax, 56(%3)\n"
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"34: movl %%edx, 60(%3)\n"
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" addl $-64, %0\n"
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" addl $64, %4\n"
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" addl $64, %3\n"
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" cmpl $63, %0\n"
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" ja 1b\n"
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"35: movl %0, %%eax\n"
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" shrl $2, %0\n"
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" andl $3, %%eax\n"
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" cld\n"
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"99: rep; movsl\n"
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"36: movl %%eax, %0\n"
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"37: rep; movsb\n"
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"100:\n"
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".section .fixup,\"ax\"\n"
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"101: lea 0(%%eax,%0,4),%0\n"
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" jmp 100b\n"
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".previous\n"
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_ASM_EXTABLE_UA(1b, 100b)
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_ASM_EXTABLE_UA(2b, 100b)
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_ASM_EXTABLE_UA(3b, 100b)
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_ASM_EXTABLE_UA(4b, 100b)
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_ASM_EXTABLE_UA(5b, 100b)
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_ASM_EXTABLE_UA(6b, 100b)
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_ASM_EXTABLE_UA(7b, 100b)
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_ASM_EXTABLE_UA(8b, 100b)
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_ASM_EXTABLE_UA(9b, 100b)
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_ASM_EXTABLE_UA(10b, 100b)
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_ASM_EXTABLE_UA(11b, 100b)
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_ASM_EXTABLE_UA(12b, 100b)
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_ASM_EXTABLE_UA(13b, 100b)
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_ASM_EXTABLE_UA(14b, 100b)
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_ASM_EXTABLE_UA(15b, 100b)
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_ASM_EXTABLE_UA(16b, 100b)
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_ASM_EXTABLE_UA(17b, 100b)
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_ASM_EXTABLE_UA(18b, 100b)
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_ASM_EXTABLE_UA(19b, 100b)
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_ASM_EXTABLE_UA(20b, 100b)
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_ASM_EXTABLE_UA(21b, 100b)
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_ASM_EXTABLE_UA(22b, 100b)
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_ASM_EXTABLE_UA(23b, 100b)
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_ASM_EXTABLE_UA(24b, 100b)
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_ASM_EXTABLE_UA(25b, 100b)
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_ASM_EXTABLE_UA(26b, 100b)
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_ASM_EXTABLE_UA(27b, 100b)
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_ASM_EXTABLE_UA(28b, 100b)
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_ASM_EXTABLE_UA(29b, 100b)
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_ASM_EXTABLE_UA(30b, 100b)
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_ASM_EXTABLE_UA(31b, 100b)
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_ASM_EXTABLE_UA(32b, 100b)
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_ASM_EXTABLE_UA(33b, 100b)
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_ASM_EXTABLE_UA(34b, 100b)
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_ASM_EXTABLE_UA(35b, 100b)
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_ASM_EXTABLE_UA(36b, 100b)
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_ASM_EXTABLE_UA(37b, 100b)
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_ASM_EXTABLE_UA(99b, 101b)
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: "=&c"(size), "=&D" (d0), "=&S" (d1)
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: "1"(to), "2"(from), "0"(size)
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: "eax", "edx", "memory");
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return size;
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}
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static unsigned long __copy_user_intel_nocache(void *to,
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const void __user *from, unsigned long size)
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{
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int d0, d1;
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__asm__ __volatile__(
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" .align 2,0x90\n"
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"0: movl 32(%4), %%eax\n"
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" cmpl $67, %0\n"
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" jbe 2f\n"
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"1: movl 64(%4), %%eax\n"
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" .align 2,0x90\n"
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"2: movl 0(%4), %%eax\n"
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"21: movl 4(%4), %%edx\n"
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" movnti %%eax, 0(%3)\n"
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" movnti %%edx, 4(%3)\n"
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"3: movl 8(%4), %%eax\n"
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"31: movl 12(%4),%%edx\n"
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" movnti %%eax, 8(%3)\n"
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" movnti %%edx, 12(%3)\n"
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"4: movl 16(%4), %%eax\n"
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"41: movl 20(%4), %%edx\n"
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" movnti %%eax, 16(%3)\n"
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" movnti %%edx, 20(%3)\n"
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"10: movl 24(%4), %%eax\n"
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"51: movl 28(%4), %%edx\n"
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" movnti %%eax, 24(%3)\n"
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" movnti %%edx, 28(%3)\n"
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"11: movl 32(%4), %%eax\n"
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"61: movl 36(%4), %%edx\n"
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" movnti %%eax, 32(%3)\n"
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" movnti %%edx, 36(%3)\n"
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"12: movl 40(%4), %%eax\n"
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"71: movl 44(%4), %%edx\n"
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" movnti %%eax, 40(%3)\n"
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" movnti %%edx, 44(%3)\n"
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"13: movl 48(%4), %%eax\n"
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"81: movl 52(%4), %%edx\n"
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" movnti %%eax, 48(%3)\n"
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" movnti %%edx, 52(%3)\n"
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"14: movl 56(%4), %%eax\n"
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"91: movl 60(%4), %%edx\n"
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" movnti %%eax, 56(%3)\n"
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" movnti %%edx, 60(%3)\n"
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" addl $-64, %0\n"
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" addl $64, %4\n"
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" addl $64, %3\n"
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" cmpl $63, %0\n"
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" ja 0b\n"
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" sfence \n"
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"5: movl %0, %%eax\n"
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" shrl $2, %0\n"
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" andl $3, %%eax\n"
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" cld\n"
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"6: rep; movsl\n"
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" movl %%eax,%0\n"
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"7: rep; movsb\n"
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"8:\n"
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".section .fixup,\"ax\"\n"
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"9: lea 0(%%eax,%0,4),%0\n"
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"16: jmp 8b\n"
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".previous\n"
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_ASM_EXTABLE_UA(0b, 16b)
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_ASM_EXTABLE_UA(1b, 16b)
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_ASM_EXTABLE_UA(2b, 16b)
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_ASM_EXTABLE_UA(21b, 16b)
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_ASM_EXTABLE_UA(3b, 16b)
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_ASM_EXTABLE_UA(31b, 16b)
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_ASM_EXTABLE_UA(4b, 16b)
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_ASM_EXTABLE_UA(41b, 16b)
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_ASM_EXTABLE_UA(10b, 16b)
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_ASM_EXTABLE_UA(51b, 16b)
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_ASM_EXTABLE_UA(11b, 16b)
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_ASM_EXTABLE_UA(61b, 16b)
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_ASM_EXTABLE_UA(12b, 16b)
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_ASM_EXTABLE_UA(71b, 16b)
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_ASM_EXTABLE_UA(13b, 16b)
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_ASM_EXTABLE_UA(81b, 16b)
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_ASM_EXTABLE_UA(14b, 16b)
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_ASM_EXTABLE_UA(91b, 16b)
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_ASM_EXTABLE_UA(6b, 9b)
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_ASM_EXTABLE_UA(7b, 16b)
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: "=&c"(size), "=&D" (d0), "=&S" (d1)
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: "1"(to), "2"(from), "0"(size)
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: "eax", "edx", "memory");
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return size;
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}
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#else
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/*
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* Leave these declared but undefined. They should not be any references to
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* them
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*/
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unsigned long __copy_user_intel(void __user *to, const void *from,
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unsigned long size);
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#endif /* CONFIG_X86_INTEL_USERCOPY */
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/* Generic arbitrary sized copy. */
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#define __copy_user(to, from, size) \
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do { \
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int __d0, __d1, __d2; \
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__asm__ __volatile__( \
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" cmp $7,%0\n" \
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" jbe 1f\n" \
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" movl %1,%0\n" \
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" negl %0\n" \
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" andl $7,%0\n" \
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" subl %0,%3\n" \
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"4: rep; movsb\n" \
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" movl %3,%0\n" \
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" shrl $2,%0\n" \
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" andl $3,%3\n" \
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" .align 2,0x90\n" \
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"0: rep; movsl\n" \
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" movl %3,%0\n" \
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"1: rep; movsb\n" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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"5: addl %3,%0\n" \
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" jmp 2b\n" \
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"3: lea 0(%3,%0,4),%0\n" \
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" jmp 2b\n" \
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".previous\n" \
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_ASM_EXTABLE_UA(4b, 5b) \
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_ASM_EXTABLE_UA(0b, 3b) \
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_ASM_EXTABLE_UA(1b, 2b) \
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: "=&c"(size), "=&D" (__d0), "=&S" (__d1), "=r"(__d2) \
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: "3"(size), "0"(size), "1"(to), "2"(from) \
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: "memory"); \
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} while (0)
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unsigned long __copy_user_ll(void *to, const void *from, unsigned long n)
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{
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__uaccess_begin_nospec();
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if (movsl_is_ok(to, from, n))
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__copy_user(to, from, n);
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else
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n = __copy_user_intel(to, from, n);
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__uaccess_end();
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return n;
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}
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EXPORT_SYMBOL(__copy_user_ll);
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unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *from,
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unsigned long n)
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{
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__uaccess_begin_nospec();
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#ifdef CONFIG_X86_INTEL_USERCOPY
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if (n > 64 && static_cpu_has(X86_FEATURE_XMM2))
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n = __copy_user_intel_nocache(to, from, n);
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else
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__copy_user(to, from, n);
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#else
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__copy_user(to, from, n);
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#endif
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__uaccess_end();
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return n;
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}
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EXPORT_SYMBOL(__copy_from_user_ll_nocache_nozero);
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