![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>
451 lines
9.3 KiB
C
451 lines
9.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Procfs interface for the PCI bus
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*
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* Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz>
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*/
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/capability.h>
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#include <linux/uaccess.h>
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#include <asm/byteorder.h>
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#include "pci.h"
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static int proc_initialized; /* = 0 */
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static loff_t proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
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{
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struct pci_dev *dev = PDE_DATA(file_inode(file));
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return fixed_size_llseek(file, off, whence, dev->cfg_size);
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}
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static ssize_t proc_bus_pci_read(struct file *file, char __user *buf,
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size_t nbytes, loff_t *ppos)
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{
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struct pci_dev *dev = PDE_DATA(file_inode(file));
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unsigned int pos = *ppos;
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unsigned int cnt, size;
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/*
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* Normal users can read only the standardized portion of the
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* configuration space as several chips lock up when trying to read
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* undefined locations (think of Intel PIIX4 as a typical example).
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*/
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if (capable(CAP_SYS_ADMIN))
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size = dev->cfg_size;
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else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
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size = 128;
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else
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size = 64;
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if (pos >= size)
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return 0;
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if (nbytes >= size)
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nbytes = size;
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if (pos + nbytes > size)
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nbytes = size - pos;
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cnt = nbytes;
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if (!access_ok(buf, cnt))
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return -EINVAL;
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pci_config_pm_runtime_get(dev);
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if ((pos & 1) && cnt) {
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unsigned char val;
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pci_user_read_config_byte(dev, pos, &val);
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__put_user(val, buf);
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buf++;
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pos++;
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cnt--;
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}
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if ((pos & 3) && cnt > 2) {
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unsigned short val;
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pci_user_read_config_word(dev, pos, &val);
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__put_user(cpu_to_le16(val), (__le16 __user *) buf);
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buf += 2;
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pos += 2;
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cnt -= 2;
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}
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while (cnt >= 4) {
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unsigned int val;
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pci_user_read_config_dword(dev, pos, &val);
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__put_user(cpu_to_le32(val), (__le32 __user *) buf);
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buf += 4;
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pos += 4;
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cnt -= 4;
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}
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if (cnt >= 2) {
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unsigned short val;
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pci_user_read_config_word(dev, pos, &val);
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__put_user(cpu_to_le16(val), (__le16 __user *) buf);
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buf += 2;
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pos += 2;
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cnt -= 2;
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}
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if (cnt) {
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unsigned char val;
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pci_user_read_config_byte(dev, pos, &val);
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__put_user(val, buf);
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buf++;
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pos++;
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cnt--;
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}
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pci_config_pm_runtime_put(dev);
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*ppos = pos;
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return nbytes;
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}
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static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf,
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size_t nbytes, loff_t *ppos)
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{
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struct inode *ino = file_inode(file);
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struct pci_dev *dev = PDE_DATA(ino);
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int pos = *ppos;
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int size = dev->cfg_size;
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int cnt;
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if (pos >= size)
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return 0;
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if (nbytes >= size)
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nbytes = size;
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if (pos + nbytes > size)
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nbytes = size - pos;
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cnt = nbytes;
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if (!access_ok(buf, cnt))
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return -EINVAL;
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pci_config_pm_runtime_get(dev);
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if ((pos & 1) && cnt) {
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unsigned char val;
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__get_user(val, buf);
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pci_user_write_config_byte(dev, pos, val);
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buf++;
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pos++;
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cnt--;
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}
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if ((pos & 3) && cnt > 2) {
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__le16 val;
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__get_user(val, (__le16 __user *) buf);
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pci_user_write_config_word(dev, pos, le16_to_cpu(val));
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buf += 2;
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pos += 2;
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cnt -= 2;
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}
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while (cnt >= 4) {
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__le32 val;
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__get_user(val, (__le32 __user *) buf);
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pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
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buf += 4;
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pos += 4;
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cnt -= 4;
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}
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if (cnt >= 2) {
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__le16 val;
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__get_user(val, (__le16 __user *) buf);
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pci_user_write_config_word(dev, pos, le16_to_cpu(val));
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buf += 2;
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pos += 2;
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cnt -= 2;
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}
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if (cnt) {
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unsigned char val;
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__get_user(val, buf);
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pci_user_write_config_byte(dev, pos, val);
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buf++;
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pos++;
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cnt--;
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}
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pci_config_pm_runtime_put(dev);
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*ppos = pos;
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i_size_write(ino, dev->cfg_size);
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return nbytes;
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}
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struct pci_filp_private {
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enum pci_mmap_state mmap_state;
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int write_combine;
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};
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static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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struct pci_dev *dev = PDE_DATA(file_inode(file));
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#ifdef HAVE_PCI_MMAP
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struct pci_filp_private *fpriv = file->private_data;
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#endif /* HAVE_PCI_MMAP */
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int ret = 0;
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switch (cmd) {
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case PCIIOC_CONTROLLER:
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ret = pci_domain_nr(dev->bus);
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break;
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#ifdef HAVE_PCI_MMAP
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case PCIIOC_MMAP_IS_IO:
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if (!arch_can_pci_mmap_io())
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return -EINVAL;
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fpriv->mmap_state = pci_mmap_io;
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break;
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case PCIIOC_MMAP_IS_MEM:
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fpriv->mmap_state = pci_mmap_mem;
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break;
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case PCIIOC_WRITE_COMBINE:
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if (arch_can_pci_mmap_wc()) {
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if (arg)
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fpriv->write_combine = 1;
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else
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fpriv->write_combine = 0;
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break;
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}
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/* If arch decided it can't, fall through... */
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#endif /* HAVE_PCI_MMAP */
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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#ifdef HAVE_PCI_MMAP
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static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
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{
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struct pci_dev *dev = PDE_DATA(file_inode(file));
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struct pci_filp_private *fpriv = file->private_data;
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int i, ret, write_combine = 0, res_bit = IORESOURCE_MEM;
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if (!capable(CAP_SYS_RAWIO))
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return -EPERM;
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if (fpriv->mmap_state == pci_mmap_io) {
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if (!arch_can_pci_mmap_io())
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return -EINVAL;
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res_bit = IORESOURCE_IO;
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}
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/* Make sure the caller is mapping a real resource for this device */
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for (i = 0; i < PCI_ROM_RESOURCE; i++) {
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if (dev->resource[i].flags & res_bit &&
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pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS))
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break;
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}
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if (i >= PCI_ROM_RESOURCE)
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return -ENODEV;
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if (fpriv->mmap_state == pci_mmap_mem &&
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fpriv->write_combine) {
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if (dev->resource[i].flags & IORESOURCE_PREFETCH)
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write_combine = 1;
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else
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return -EINVAL;
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}
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ret = pci_mmap_page_range(dev, i, vma,
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fpriv->mmap_state, write_combine);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int proc_bus_pci_open(struct inode *inode, struct file *file)
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{
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struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
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if (!fpriv)
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return -ENOMEM;
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fpriv->mmap_state = pci_mmap_io;
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fpriv->write_combine = 0;
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file->private_data = fpriv;
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return 0;
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}
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static int proc_bus_pci_release(struct inode *inode, struct file *file)
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{
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kfree(file->private_data);
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file->private_data = NULL;
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return 0;
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}
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#endif /* HAVE_PCI_MMAP */
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static const struct file_operations proc_bus_pci_operations = {
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.owner = THIS_MODULE,
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.llseek = proc_bus_pci_lseek,
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.read = proc_bus_pci_read,
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.write = proc_bus_pci_write,
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.unlocked_ioctl = proc_bus_pci_ioctl,
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.compat_ioctl = proc_bus_pci_ioctl,
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#ifdef HAVE_PCI_MMAP
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.open = proc_bus_pci_open,
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.release = proc_bus_pci_release,
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.mmap = proc_bus_pci_mmap,
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#ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
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.get_unmapped_area = get_pci_unmapped_area,
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#endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
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#endif /* HAVE_PCI_MMAP */
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};
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/* iterator */
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static void *pci_seq_start(struct seq_file *m, loff_t *pos)
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{
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struct pci_dev *dev = NULL;
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loff_t n = *pos;
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for_each_pci_dev(dev) {
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if (!n--)
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break;
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}
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return dev;
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}
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static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
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{
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struct pci_dev *dev = v;
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(*pos)++;
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dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
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return dev;
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}
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static void pci_seq_stop(struct seq_file *m, void *v)
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{
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if (v) {
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struct pci_dev *dev = v;
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pci_dev_put(dev);
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}
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}
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static int show_device(struct seq_file *m, void *v)
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{
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const struct pci_dev *dev = v;
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const struct pci_driver *drv;
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int i;
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if (dev == NULL)
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return 0;
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drv = pci_dev_driver(dev);
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seq_printf(m, "%02x%02x\t%04x%04x\t%x",
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dev->bus->number,
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dev->devfn,
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dev->vendor,
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dev->device,
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dev->irq);
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/* only print standard and ROM resources to preserve compatibility */
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for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
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resource_size_t start, end;
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pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
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seq_printf(m, "\t%16llx",
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(unsigned long long)(start |
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(dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
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}
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for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
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resource_size_t start, end;
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pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
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seq_printf(m, "\t%16llx",
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dev->resource[i].start < dev->resource[i].end ?
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(unsigned long long)(end - start) + 1 : 0);
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}
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seq_putc(m, '\t');
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if (drv)
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seq_printf(m, "%s", drv->name);
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seq_putc(m, '\n');
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return 0;
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}
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static const struct seq_operations proc_bus_pci_devices_op = {
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.start = pci_seq_start,
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.next = pci_seq_next,
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.stop = pci_seq_stop,
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.show = show_device
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};
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static struct proc_dir_entry *proc_bus_pci_dir;
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int pci_proc_attach_device(struct pci_dev *dev)
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{
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struct pci_bus *bus = dev->bus;
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struct proc_dir_entry *e;
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char name[16];
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if (!proc_initialized)
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return -EACCES;
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if (!bus->procdir) {
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if (pci_proc_domain(bus)) {
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sprintf(name, "%04x:%02x", pci_domain_nr(bus),
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bus->number);
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} else {
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sprintf(name, "%02x", bus->number);
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}
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bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
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if (!bus->procdir)
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return -ENOMEM;
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}
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sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
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e = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir,
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&proc_bus_pci_operations, dev);
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if (!e)
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return -ENOMEM;
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proc_set_size(e, dev->cfg_size);
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dev->procent = e;
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return 0;
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}
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int pci_proc_detach_device(struct pci_dev *dev)
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{
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proc_remove(dev->procent);
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dev->procent = NULL;
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return 0;
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}
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int pci_proc_detach_bus(struct pci_bus *bus)
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{
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proc_remove(bus->procdir);
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return 0;
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}
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static int __init pci_proc_init(void)
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{
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struct pci_dev *dev = NULL;
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proc_bus_pci_dir = proc_mkdir("bus/pci", NULL);
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proc_create_seq("devices", 0, proc_bus_pci_dir,
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&proc_bus_pci_devices_op);
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proc_initialized = 1;
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for_each_pci_dev(dev)
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pci_proc_attach_device(dev);
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return 0;
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}
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device_initcall(pci_proc_init);
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