54b21a7992
We've had two instances recently of overflows when doing 64_bit_value = (32_bit_value << PAGE_CACHE_SHIFT) I did a tree-wide grep of `<<.*PAGE_CACHE_SHIFT' and this is the result. - afs_rxfs_fetch_descriptor.offset is of type off_t, which seems broken. - jfs and jffs are limited to 4GB anyway. - reiserfs map_block_for_writepage() takes an unsigned long for the block - it should take sector_t. (It'll fail for huge filesystems with blocksize<PAGE_CACHE_SIZE) - cramfs_read() needs to use sector_t (I think cramsfs is busted on large filesystems anyway) - affs is limited in file size anyway. - I generally didn't fix 32-bit overflows in directory operations. - arm's __flush_dcache_page() is peculiar. What if the page lies beyond 4G? - gss_wrap_req_priv() needs checking (snd_buf->page_base) Cc: Oleg Drokin <green@linuxhacker.ru> Cc: David Howells <dhowells@redhat.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: <reiserfs-dev@namesys.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Anton Altaparmakov <aia21@cantab.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: <linux-fsdevel@vger.kernel.org> Cc: Miklos Szeredi <miklos@szeredi.hu> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: Neil Brown <neilb@cse.unsw.edu.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
114 lines
3.4 KiB
C
114 lines
3.4 KiB
C
/*
|
|
* Copyright (c) 2000-2001 Christoph Hellwig.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions, and the following disclaimer,
|
|
* without modification.
|
|
* 2. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL").
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
|
|
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Veritas filesystem driver - support for 'immed' inodes.
|
|
*/
|
|
#include <linux/fs.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/namei.h>
|
|
|
|
#include "vxfs.h"
|
|
#include "vxfs_inode.h"
|
|
|
|
|
|
static void * vxfs_immed_follow_link(struct dentry *, struct nameidata *);
|
|
|
|
static int vxfs_immed_readpage(struct file *, struct page *);
|
|
|
|
/*
|
|
* Inode operations for immed symlinks.
|
|
*
|
|
* Unliked all other operations we do not go through the pagecache,
|
|
* but do all work directly on the inode.
|
|
*/
|
|
struct inode_operations vxfs_immed_symlink_iops = {
|
|
.readlink = generic_readlink,
|
|
.follow_link = vxfs_immed_follow_link,
|
|
};
|
|
|
|
/*
|
|
* Adress space operations for immed files and directories.
|
|
*/
|
|
struct address_space_operations vxfs_immed_aops = {
|
|
.readpage = vxfs_immed_readpage,
|
|
};
|
|
|
|
/**
|
|
* vxfs_immed_follow_link - follow immed symlink
|
|
* @dp: dentry for the link
|
|
* @np: pathname lookup data for the current path walk
|
|
*
|
|
* Description:
|
|
* vxfs_immed_follow_link restarts the pathname lookup with
|
|
* the data obtained from @dp.
|
|
*
|
|
* Returns:
|
|
* Zero on success, else a negative error code.
|
|
*/
|
|
static void *
|
|
vxfs_immed_follow_link(struct dentry *dp, struct nameidata *np)
|
|
{
|
|
struct vxfs_inode_info *vip = VXFS_INO(dp->d_inode);
|
|
nd_set_link(np, vip->vii_immed.vi_immed);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* vxfs_immed_readpage - read part of an immed inode into pagecache
|
|
* @file: file context (unused)
|
|
* @page: page frame to fill in.
|
|
*
|
|
* Description:
|
|
* vxfs_immed_readpage reads a part of the immed area of the
|
|
* file that hosts @pp into the pagecache.
|
|
*
|
|
* Returns:
|
|
* Zero on success, else a negative error code.
|
|
*
|
|
* Locking status:
|
|
* @page is locked and will be unlocked.
|
|
*/
|
|
static int
|
|
vxfs_immed_readpage(struct file *fp, struct page *pp)
|
|
{
|
|
struct vxfs_inode_info *vip = VXFS_INO(pp->mapping->host);
|
|
u_int64_t offset = (u_int64_t)pp->index << PAGE_CACHE_SHIFT;
|
|
caddr_t kaddr;
|
|
|
|
kaddr = kmap(pp);
|
|
memcpy(kaddr, vip->vii_immed.vi_immed + offset, PAGE_CACHE_SIZE);
|
|
kunmap(pp);
|
|
|
|
flush_dcache_page(pp);
|
|
SetPageUptodate(pp);
|
|
unlock_page(pp);
|
|
|
|
return 0;
|
|
}
|