linux/fs/ramfs/file-nommu.c
David Howells 21ff821630 [PATCH] NOMMU: Fix execution off of ramfs with mmap()
Fix execution through the FDPIC binfmt of programs stored on ramfs by
preventing the ramfs mmap() returning successfully on a private mapping of
a ramfs file.  This causes NOMMU mmap to make a copy of the mapped portion
of the file and map that instead.

This could be improved by granting direct mapping access to read-only
private mappings for which the data is stored on a contiguous run of pages.
 However, this is only likely to be the case if the file was extended with
truncate before being written.

ramfs is left to map the file directly for shared mappings so that SYSV IPC
and POSIX shared memory both still work.

Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-07-10 13:24:21 -07:00

292 lines
7.5 KiB
C

/* file-nommu.c: no-MMU version of ramfs
*
* Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/smp_lock.h>
#include <linux/backing-dev.h>
#include <linux/ramfs.h>
#include <linux/quotaops.h>
#include <linux/pagevec.h>
#include <linux/mman.h>
#include <asm/uaccess.h>
#include "internal.h"
static int ramfs_nommu_setattr(struct dentry *, struct iattr *);
const struct address_space_operations ramfs_aops = {
.readpage = simple_readpage,
.prepare_write = simple_prepare_write,
.commit_write = simple_commit_write
};
const struct file_operations ramfs_file_operations = {
.mmap = ramfs_nommu_mmap,
.get_unmapped_area = ramfs_nommu_get_unmapped_area,
.read = generic_file_read,
.write = generic_file_write,
.fsync = simple_sync_file,
.sendfile = generic_file_sendfile,
.llseek = generic_file_llseek,
};
struct inode_operations ramfs_file_inode_operations = {
.setattr = ramfs_nommu_setattr,
.getattr = simple_getattr,
};
/*****************************************************************************/
/*
* add a contiguous set of pages into a ramfs inode when it's truncated from
* size 0 on the assumption that it's going to be used for an mmap of shared
* memory
*/
static int ramfs_nommu_expand_for_mapping(struct inode *inode, size_t newsize)
{
struct pagevec lru_pvec;
unsigned long npages, xpages, loop, limit;
struct page *pages;
unsigned order;
void *data;
int ret;
/* make various checks */
order = get_order(newsize);
if (unlikely(order >= MAX_ORDER))
goto too_big;
limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
if (limit != RLIM_INFINITY && newsize > limit)
goto fsize_exceeded;
if (newsize > inode->i_sb->s_maxbytes)
goto too_big;
i_size_write(inode, newsize);
/* allocate enough contiguous pages to be able to satisfy the
* request */
pages = alloc_pages(mapping_gfp_mask(inode->i_mapping), order);
if (!pages)
return -ENOMEM;
/* split the high-order page into an array of single pages */
xpages = 1UL << order;
npages = (newsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
split_page(pages, order);
/* trim off any pages we don't actually require */
for (loop = npages; loop < xpages; loop++)
__free_page(pages + loop);
/* clear the memory we allocated */
newsize = PAGE_SIZE * npages;
data = page_address(pages);
memset(data, 0, newsize);
/* attach all the pages to the inode's address space */
pagevec_init(&lru_pvec, 0);
for (loop = 0; loop < npages; loop++) {
struct page *page = pages + loop;
ret = add_to_page_cache(page, inode->i_mapping, loop, GFP_KERNEL);
if (ret < 0)
goto add_error;
if (!pagevec_add(&lru_pvec, page))
__pagevec_lru_add(&lru_pvec);
unlock_page(page);
}
pagevec_lru_add(&lru_pvec);
return 0;
fsize_exceeded:
send_sig(SIGXFSZ, current, 0);
too_big:
return -EFBIG;
add_error:
page_cache_release(pages + loop);
for (loop++; loop < npages; loop++)
__free_page(pages + loop);
return ret;
}
/*****************************************************************************/
/*
* check that file shrinkage doesn't leave any VMAs dangling in midair
*/
static int ramfs_nommu_check_mappings(struct inode *inode,
size_t newsize, size_t size)
{
struct vm_area_struct *vma;
struct prio_tree_iter iter;
/* search for VMAs that fall within the dead zone */
vma_prio_tree_foreach(vma, &iter, &inode->i_mapping->i_mmap,
newsize >> PAGE_SHIFT,
(size + PAGE_SIZE - 1) >> PAGE_SHIFT
) {
/* found one - only interested if it's shared out of the page
* cache */
if (vma->vm_flags & VM_SHARED)
return -ETXTBSY; /* not quite true, but near enough */
}
return 0;
}
/*****************************************************************************/
/*
*
*/
static int ramfs_nommu_resize(struct inode *inode, loff_t newsize, loff_t size)
{
int ret;
/* assume a truncate from zero size is going to be for the purposes of
* shared mmap */
if (size == 0) {
if (unlikely(newsize >> 32))
return -EFBIG;
return ramfs_nommu_expand_for_mapping(inode, newsize);
}
/* check that a decrease in size doesn't cut off any shared mappings */
if (newsize < size) {
ret = ramfs_nommu_check_mappings(inode, newsize, size);
if (ret < 0)
return ret;
}
ret = vmtruncate(inode, size);
return ret;
}
/*****************************************************************************/
/*
* handle a change of attributes
* - we're specifically interested in a change of size
*/
static int ramfs_nommu_setattr(struct dentry *dentry, struct iattr *ia)
{
struct inode *inode = dentry->d_inode;
unsigned int old_ia_valid = ia->ia_valid;
int ret = 0;
/* by providing our own setattr() method, we skip this quotaism */
if ((old_ia_valid & ATTR_UID && ia->ia_uid != inode->i_uid) ||
(old_ia_valid & ATTR_GID && ia->ia_gid != inode->i_gid))
ret = DQUOT_TRANSFER(inode, ia) ? -EDQUOT : 0;
/* pick out size-changing events */
if (ia->ia_valid & ATTR_SIZE) {
loff_t size = i_size_read(inode);
if (ia->ia_size != size) {
ret = ramfs_nommu_resize(inode, ia->ia_size, size);
if (ret < 0 || ia->ia_valid == ATTR_SIZE)
goto out;
} else {
/* we skipped the truncate but must still update
* timestamps
*/
ia->ia_valid |= ATTR_MTIME|ATTR_CTIME;
}
}
ret = inode_setattr(inode, ia);
out:
ia->ia_valid = old_ia_valid;
return ret;
}
/*****************************************************************************/
/*
* try to determine where a shared mapping can be made
* - we require that:
* - the pages to be mapped must exist
* - the pages be physically contiguous in sequence
*/
unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
unsigned long addr, unsigned long len,
unsigned long pgoff, unsigned long flags)
{
unsigned long maxpages, lpages, nr, loop, ret;
struct inode *inode = file->f_dentry->d_inode;
struct page **pages = NULL, **ptr, *page;
loff_t isize;
if (!(flags & MAP_SHARED))
return addr;
/* the mapping mustn't extend beyond the EOF */
lpages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
isize = i_size_read(inode);
ret = -EINVAL;
maxpages = (isize + PAGE_SIZE - 1) >> PAGE_SHIFT;
if (pgoff >= maxpages)
goto out;
if (maxpages - pgoff < lpages)
goto out;
/* gang-find the pages */
ret = -ENOMEM;
pages = kzalloc(lpages * sizeof(struct page *), GFP_KERNEL);
if (!pages)
goto out;
nr = find_get_pages(inode->i_mapping, pgoff, lpages, pages);
if (nr != lpages)
goto out; /* leave if some pages were missing */
/* check the pages for physical adjacency */
ptr = pages;
page = *ptr++;
page++;
for (loop = lpages; loop > 1; loop--)
if (*ptr++ != page++)
goto out;
/* okay - all conditions fulfilled */
ret = (unsigned long) page_address(pages[0]);
out:
if (pages) {
ptr = pages;
for (loop = lpages; loop > 0; loop--)
put_page(*ptr++);
kfree(pages);
}
return ret;
}
/*****************************************************************************/
/*
* set up a mapping for shared memory segments
*/
int ramfs_nommu_mmap(struct file *file, struct vm_area_struct *vma)
{
return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
}