![Linus Torvalds](/assets/img/avatar_default.png)
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>
607 lines
15 KiB
C
607 lines
15 KiB
C
/*
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* Copyright (C) 2012 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/memblock.h>
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#include <linux/pstore_ram.h>
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#include <linux/rslib.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/vmalloc.h>
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#include <asm/page.h>
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/**
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* struct persistent_ram_buffer - persistent circular RAM buffer
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*
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* @sig:
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* signature to indicate header (PERSISTENT_RAM_SIG xor PRZ-type value)
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* @start:
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* offset into @data where the beginning of the stored bytes begin
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* @size:
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* number of valid bytes stored in @data
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*/
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struct persistent_ram_buffer {
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uint32_t sig;
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atomic_t start;
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atomic_t size;
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uint8_t data[0];
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};
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#define PERSISTENT_RAM_SIG (0x43474244) /* DBGC */
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static inline size_t buffer_size(struct persistent_ram_zone *prz)
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{
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return atomic_read(&prz->buffer->size);
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}
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static inline size_t buffer_start(struct persistent_ram_zone *prz)
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{
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return atomic_read(&prz->buffer->start);
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}
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/* increase and wrap the start pointer, returning the old value */
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static size_t buffer_start_add(struct persistent_ram_zone *prz, size_t a)
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{
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int old;
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int new;
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unsigned long flags = 0;
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if (!(prz->flags & PRZ_FLAG_NO_LOCK))
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raw_spin_lock_irqsave(&prz->buffer_lock, flags);
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old = atomic_read(&prz->buffer->start);
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new = old + a;
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while (unlikely(new >= prz->buffer_size))
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new -= prz->buffer_size;
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atomic_set(&prz->buffer->start, new);
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if (!(prz->flags & PRZ_FLAG_NO_LOCK))
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raw_spin_unlock_irqrestore(&prz->buffer_lock, flags);
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return old;
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}
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/* increase the size counter until it hits the max size */
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static void buffer_size_add(struct persistent_ram_zone *prz, size_t a)
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{
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size_t old;
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size_t new;
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unsigned long flags = 0;
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if (!(prz->flags & PRZ_FLAG_NO_LOCK))
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raw_spin_lock_irqsave(&prz->buffer_lock, flags);
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old = atomic_read(&prz->buffer->size);
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if (old == prz->buffer_size)
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goto exit;
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new = old + a;
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if (new > prz->buffer_size)
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new = prz->buffer_size;
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atomic_set(&prz->buffer->size, new);
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exit:
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if (!(prz->flags & PRZ_FLAG_NO_LOCK))
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raw_spin_unlock_irqrestore(&prz->buffer_lock, flags);
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}
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static void notrace persistent_ram_encode_rs8(struct persistent_ram_zone *prz,
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uint8_t *data, size_t len, uint8_t *ecc)
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{
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int i;
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/* Initialize the parity buffer */
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memset(prz->ecc_info.par, 0,
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prz->ecc_info.ecc_size * sizeof(prz->ecc_info.par[0]));
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encode_rs8(prz->rs_decoder, data, len, prz->ecc_info.par, 0);
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for (i = 0; i < prz->ecc_info.ecc_size; i++)
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ecc[i] = prz->ecc_info.par[i];
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}
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static int persistent_ram_decode_rs8(struct persistent_ram_zone *prz,
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void *data, size_t len, uint8_t *ecc)
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{
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int i;
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for (i = 0; i < prz->ecc_info.ecc_size; i++)
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prz->ecc_info.par[i] = ecc[i];
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return decode_rs8(prz->rs_decoder, data, prz->ecc_info.par, len,
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NULL, 0, NULL, 0, NULL);
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}
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static void notrace persistent_ram_update_ecc(struct persistent_ram_zone *prz,
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unsigned int start, unsigned int count)
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{
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struct persistent_ram_buffer *buffer = prz->buffer;
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uint8_t *buffer_end = buffer->data + prz->buffer_size;
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uint8_t *block;
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uint8_t *par;
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int ecc_block_size = prz->ecc_info.block_size;
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int ecc_size = prz->ecc_info.ecc_size;
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int size = ecc_block_size;
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if (!ecc_size)
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return;
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block = buffer->data + (start & ~(ecc_block_size - 1));
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par = prz->par_buffer + (start / ecc_block_size) * ecc_size;
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do {
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if (block + ecc_block_size > buffer_end)
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size = buffer_end - block;
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persistent_ram_encode_rs8(prz, block, size, par);
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block += ecc_block_size;
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par += ecc_size;
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} while (block < buffer->data + start + count);
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}
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static void persistent_ram_update_header_ecc(struct persistent_ram_zone *prz)
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{
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struct persistent_ram_buffer *buffer = prz->buffer;
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if (!prz->ecc_info.ecc_size)
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return;
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persistent_ram_encode_rs8(prz, (uint8_t *)buffer, sizeof(*buffer),
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prz->par_header);
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}
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static void persistent_ram_ecc_old(struct persistent_ram_zone *prz)
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{
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struct persistent_ram_buffer *buffer = prz->buffer;
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uint8_t *block;
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uint8_t *par;
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if (!prz->ecc_info.ecc_size)
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return;
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block = buffer->data;
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par = prz->par_buffer;
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while (block < buffer->data + buffer_size(prz)) {
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int numerr;
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int size = prz->ecc_info.block_size;
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if (block + size > buffer->data + prz->buffer_size)
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size = buffer->data + prz->buffer_size - block;
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numerr = persistent_ram_decode_rs8(prz, block, size, par);
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if (numerr > 0) {
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pr_devel("error in block %p, %d\n", block, numerr);
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prz->corrected_bytes += numerr;
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} else if (numerr < 0) {
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pr_devel("uncorrectable error in block %p\n", block);
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prz->bad_blocks++;
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}
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block += prz->ecc_info.block_size;
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par += prz->ecc_info.ecc_size;
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}
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}
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static int persistent_ram_init_ecc(struct persistent_ram_zone *prz,
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struct persistent_ram_ecc_info *ecc_info)
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{
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int numerr;
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struct persistent_ram_buffer *buffer = prz->buffer;
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int ecc_blocks;
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size_t ecc_total;
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if (!ecc_info || !ecc_info->ecc_size)
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return 0;
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prz->ecc_info.block_size = ecc_info->block_size ?: 128;
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prz->ecc_info.ecc_size = ecc_info->ecc_size ?: 16;
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prz->ecc_info.symsize = ecc_info->symsize ?: 8;
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prz->ecc_info.poly = ecc_info->poly ?: 0x11d;
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ecc_blocks = DIV_ROUND_UP(prz->buffer_size - prz->ecc_info.ecc_size,
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prz->ecc_info.block_size +
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prz->ecc_info.ecc_size);
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ecc_total = (ecc_blocks + 1) * prz->ecc_info.ecc_size;
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if (ecc_total >= prz->buffer_size) {
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pr_err("%s: invalid ecc_size %u (total %zu, buffer size %zu)\n",
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__func__, prz->ecc_info.ecc_size,
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ecc_total, prz->buffer_size);
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return -EINVAL;
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}
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prz->buffer_size -= ecc_total;
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prz->par_buffer = buffer->data + prz->buffer_size;
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prz->par_header = prz->par_buffer +
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ecc_blocks * prz->ecc_info.ecc_size;
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/*
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* first consecutive root is 0
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* primitive element to generate roots = 1
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*/
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prz->rs_decoder = init_rs(prz->ecc_info.symsize, prz->ecc_info.poly,
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0, 1, prz->ecc_info.ecc_size);
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if (prz->rs_decoder == NULL) {
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pr_info("init_rs failed\n");
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return -EINVAL;
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}
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/* allocate workspace instead of using stack VLA */
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prz->ecc_info.par = kmalloc_array(prz->ecc_info.ecc_size,
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sizeof(*prz->ecc_info.par),
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GFP_KERNEL);
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if (!prz->ecc_info.par) {
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pr_err("cannot allocate ECC parity workspace\n");
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return -ENOMEM;
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}
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prz->corrected_bytes = 0;
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prz->bad_blocks = 0;
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numerr = persistent_ram_decode_rs8(prz, buffer, sizeof(*buffer),
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prz->par_header);
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if (numerr > 0) {
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pr_info("error in header, %d\n", numerr);
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prz->corrected_bytes += numerr;
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} else if (numerr < 0) {
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pr_info("uncorrectable error in header\n");
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prz->bad_blocks++;
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}
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return 0;
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}
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ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz,
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char *str, size_t len)
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{
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ssize_t ret;
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if (!prz->ecc_info.ecc_size)
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return 0;
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if (prz->corrected_bytes || prz->bad_blocks)
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ret = snprintf(str, len, ""
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"\n%d Corrected bytes, %d unrecoverable blocks\n",
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prz->corrected_bytes, prz->bad_blocks);
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else
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ret = snprintf(str, len, "\nNo errors detected\n");
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return ret;
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}
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static void notrace persistent_ram_update(struct persistent_ram_zone *prz,
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const void *s, unsigned int start, unsigned int count)
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{
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struct persistent_ram_buffer *buffer = prz->buffer;
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memcpy_toio(buffer->data + start, s, count);
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persistent_ram_update_ecc(prz, start, count);
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}
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static int notrace persistent_ram_update_user(struct persistent_ram_zone *prz,
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const void __user *s, unsigned int start, unsigned int count)
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{
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struct persistent_ram_buffer *buffer = prz->buffer;
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int ret = unlikely(__copy_from_user(buffer->data + start, s, count)) ?
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-EFAULT : 0;
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persistent_ram_update_ecc(prz, start, count);
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return ret;
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}
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void persistent_ram_save_old(struct persistent_ram_zone *prz)
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{
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struct persistent_ram_buffer *buffer = prz->buffer;
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size_t size = buffer_size(prz);
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size_t start = buffer_start(prz);
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if (!size)
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return;
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if (!prz->old_log) {
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persistent_ram_ecc_old(prz);
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prz->old_log = kmalloc(size, GFP_KERNEL);
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}
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if (!prz->old_log) {
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pr_err("failed to allocate buffer\n");
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return;
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}
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prz->old_log_size = size;
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memcpy_fromio(prz->old_log, &buffer->data[start], size - start);
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memcpy_fromio(prz->old_log + size - start, &buffer->data[0], start);
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}
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int notrace persistent_ram_write(struct persistent_ram_zone *prz,
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const void *s, unsigned int count)
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{
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int rem;
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int c = count;
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size_t start;
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if (unlikely(c > prz->buffer_size)) {
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s += c - prz->buffer_size;
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c = prz->buffer_size;
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}
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buffer_size_add(prz, c);
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start = buffer_start_add(prz, c);
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rem = prz->buffer_size - start;
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if (unlikely(rem < c)) {
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persistent_ram_update(prz, s, start, rem);
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s += rem;
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c -= rem;
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start = 0;
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}
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persistent_ram_update(prz, s, start, c);
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persistent_ram_update_header_ecc(prz);
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return count;
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}
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int notrace persistent_ram_write_user(struct persistent_ram_zone *prz,
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const void __user *s, unsigned int count)
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{
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int rem, ret = 0, c = count;
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size_t start;
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if (unlikely(!access_ok(s, count)))
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return -EFAULT;
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if (unlikely(c > prz->buffer_size)) {
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s += c - prz->buffer_size;
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c = prz->buffer_size;
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}
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buffer_size_add(prz, c);
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start = buffer_start_add(prz, c);
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rem = prz->buffer_size - start;
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if (unlikely(rem < c)) {
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ret = persistent_ram_update_user(prz, s, start, rem);
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s += rem;
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c -= rem;
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start = 0;
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}
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if (likely(!ret))
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ret = persistent_ram_update_user(prz, s, start, c);
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persistent_ram_update_header_ecc(prz);
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return unlikely(ret) ? ret : count;
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}
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size_t persistent_ram_old_size(struct persistent_ram_zone *prz)
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{
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return prz->old_log_size;
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}
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void *persistent_ram_old(struct persistent_ram_zone *prz)
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{
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return prz->old_log;
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}
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void persistent_ram_free_old(struct persistent_ram_zone *prz)
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{
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kfree(prz->old_log);
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prz->old_log = NULL;
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prz->old_log_size = 0;
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}
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void persistent_ram_zap(struct persistent_ram_zone *prz)
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{
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atomic_set(&prz->buffer->start, 0);
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atomic_set(&prz->buffer->size, 0);
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persistent_ram_update_header_ecc(prz);
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}
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static void *persistent_ram_vmap(phys_addr_t start, size_t size,
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unsigned int memtype)
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{
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struct page **pages;
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phys_addr_t page_start;
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unsigned int page_count;
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pgprot_t prot;
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unsigned int i;
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void *vaddr;
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page_start = start - offset_in_page(start);
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page_count = DIV_ROUND_UP(size + offset_in_page(start), PAGE_SIZE);
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if (memtype)
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prot = pgprot_noncached(PAGE_KERNEL);
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else
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prot = pgprot_writecombine(PAGE_KERNEL);
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pages = kmalloc_array(page_count, sizeof(struct page *), GFP_KERNEL);
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if (!pages) {
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pr_err("%s: Failed to allocate array for %u pages\n",
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__func__, page_count);
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return NULL;
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}
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for (i = 0; i < page_count; i++) {
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phys_addr_t addr = page_start + i * PAGE_SIZE;
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pages[i] = pfn_to_page(addr >> PAGE_SHIFT);
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}
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vaddr = vmap(pages, page_count, VM_MAP, prot);
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kfree(pages);
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/*
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* Since vmap() uses page granularity, we must add the offset
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* into the page here, to get the byte granularity address
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* into the mapping to represent the actual "start" location.
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*/
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return vaddr + offset_in_page(start);
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}
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static void *persistent_ram_iomap(phys_addr_t start, size_t size,
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unsigned int memtype, char *label)
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{
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void *va;
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if (!request_mem_region(start, size, label ?: "ramoops")) {
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pr_err("request mem region (%s 0x%llx@0x%llx) failed\n",
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label ?: "ramoops",
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(unsigned long long)size, (unsigned long long)start);
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return NULL;
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}
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if (memtype)
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va = ioremap(start, size);
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else
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va = ioremap_wc(start, size);
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/*
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* Since request_mem_region() and ioremap() are byte-granularity
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* there is no need handle anything special like we do when the
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* vmap() case in persistent_ram_vmap() above.
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*/
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return va;
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}
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static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size,
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struct persistent_ram_zone *prz, int memtype)
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{
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prz->paddr = start;
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prz->size = size;
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if (pfn_valid(start >> PAGE_SHIFT))
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prz->vaddr = persistent_ram_vmap(start, size, memtype);
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else
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prz->vaddr = persistent_ram_iomap(start, size, memtype,
|
|
prz->label);
|
|
|
|
if (!prz->vaddr) {
|
|
pr_err("%s: Failed to map 0x%llx pages at 0x%llx\n", __func__,
|
|
(unsigned long long)size, (unsigned long long)start);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
prz->buffer = prz->vaddr;
|
|
prz->buffer_size = size - sizeof(struct persistent_ram_buffer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int persistent_ram_post_init(struct persistent_ram_zone *prz, u32 sig,
|
|
struct persistent_ram_ecc_info *ecc_info)
|
|
{
|
|
int ret;
|
|
bool zap = !!(prz->flags & PRZ_FLAG_ZAP_OLD);
|
|
|
|
ret = persistent_ram_init_ecc(prz, ecc_info);
|
|
if (ret) {
|
|
pr_warn("ECC failed %s\n", prz->label);
|
|
return ret;
|
|
}
|
|
|
|
sig ^= PERSISTENT_RAM_SIG;
|
|
|
|
if (prz->buffer->sig == sig) {
|
|
if (buffer_size(prz) == 0) {
|
|
pr_debug("found existing empty buffer\n");
|
|
return 0;
|
|
}
|
|
|
|
if (buffer_size(prz) > prz->buffer_size ||
|
|
buffer_start(prz) > buffer_size(prz)) {
|
|
pr_info("found existing invalid buffer, size %zu, start %zu\n",
|
|
buffer_size(prz), buffer_start(prz));
|
|
zap = true;
|
|
} else {
|
|
pr_debug("found existing buffer, size %zu, start %zu\n",
|
|
buffer_size(prz), buffer_start(prz));
|
|
persistent_ram_save_old(prz);
|
|
}
|
|
} else {
|
|
pr_debug("no valid data in buffer (sig = 0x%08x)\n",
|
|
prz->buffer->sig);
|
|
prz->buffer->sig = sig;
|
|
zap = true;
|
|
}
|
|
|
|
/* Reset missing, invalid, or single-use memory area. */
|
|
if (zap)
|
|
persistent_ram_zap(prz);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void persistent_ram_free(struct persistent_ram_zone *prz)
|
|
{
|
|
if (!prz)
|
|
return;
|
|
|
|
if (prz->vaddr) {
|
|
if (pfn_valid(prz->paddr >> PAGE_SHIFT)) {
|
|
/* We must vunmap() at page-granularity. */
|
|
vunmap(prz->vaddr - offset_in_page(prz->paddr));
|
|
} else {
|
|
iounmap(prz->vaddr);
|
|
release_mem_region(prz->paddr, prz->size);
|
|
}
|
|
prz->vaddr = NULL;
|
|
}
|
|
if (prz->rs_decoder) {
|
|
free_rs(prz->rs_decoder);
|
|
prz->rs_decoder = NULL;
|
|
}
|
|
kfree(prz->ecc_info.par);
|
|
prz->ecc_info.par = NULL;
|
|
|
|
persistent_ram_free_old(prz);
|
|
kfree(prz->label);
|
|
kfree(prz);
|
|
}
|
|
|
|
struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size,
|
|
u32 sig, struct persistent_ram_ecc_info *ecc_info,
|
|
unsigned int memtype, u32 flags, char *label)
|
|
{
|
|
struct persistent_ram_zone *prz;
|
|
int ret = -ENOMEM;
|
|
|
|
prz = kzalloc(sizeof(struct persistent_ram_zone), GFP_KERNEL);
|
|
if (!prz) {
|
|
pr_err("failed to allocate persistent ram zone\n");
|
|
goto err;
|
|
}
|
|
|
|
/* Initialize general buffer state. */
|
|
raw_spin_lock_init(&prz->buffer_lock);
|
|
prz->flags = flags;
|
|
prz->label = label;
|
|
|
|
ret = persistent_ram_buffer_map(start, size, prz, memtype);
|
|
if (ret)
|
|
goto err;
|
|
|
|
ret = persistent_ram_post_init(prz, sig, ecc_info);
|
|
if (ret)
|
|
goto err;
|
|
|
|
pr_debug("attached %s 0x%zx@0x%llx: %zu header, %zu data, %zu ecc (%d/%d)\n",
|
|
prz->label, prz->size, (unsigned long long)prz->paddr,
|
|
sizeof(*prz->buffer), prz->buffer_size,
|
|
prz->size - sizeof(*prz->buffer) - prz->buffer_size,
|
|
prz->ecc_info.ecc_size, prz->ecc_info.block_size);
|
|
|
|
return prz;
|
|
err:
|
|
persistent_ram_free(prz);
|
|
return ERR_PTR(ret);
|
|
}
|