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* - fix-possible-page_cache_shift-overflows.patch removed from -mm tree
@ 2006-01-09  6:29 akpm
  0 siblings, 0 replies; only message in thread
From: akpm @ 2006-01-09  6:29 UTC (permalink / raw)
  To: akpm, aia21, blaisorblade, dhowells, dwmw2, green, hch, jdike,
	linux-fsdevel, miklos, neilb, reiserfs-dev, rmk, trond.myklebust,
	zippel, mm-commits


The patch titled

     fix possible PAGE_CACHE_SHIFT overflows

has been removed from the -mm tree.  Its filename is

     fix-possible-page_cache_shift-overflows.patch

This patch was probably dropped from -mm because
it has already been merged into a subsystem tree
or into Linus's tree


From: Andrew Morton <akpm@osdl.org>

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>
---

 fs/afs/dir.c             |    2 +-
 fs/buffer.c              |    6 +++---
 fs/freevxfs/vxfs_immed.c |    4 ++--
 fs/jffs/inode-v23.c      |    4 ++--
 fs/mpage.c               |    4 ++--
 fs/romfs/inode.c         |    6 +++---
 fs/smbfs/file.c          |    4 ++--
 fs/sysv/dir.c            |    4 ++--
 8 files changed, 17 insertions(+), 17 deletions(-)

diff -puN fs/afs/dir.c~fix-possible-page_cache_shift-overflows fs/afs/dir.c
--- devel/fs/afs/dir.c~fix-possible-page_cache_shift-overflows	2006-01-08 00:56:54.000000000 -0800
+++ devel-akpm/fs/afs/dir.c	2006-01-08 00:56:54.000000000 -0800
@@ -137,7 +137,7 @@ static inline void afs_dir_check_page(st
 #endif
 
 	/* determine how many magic numbers there should be in this page */
-	latter = dir->i_size - (page->index << PAGE_CACHE_SHIFT);
+	latter = dir->i_size - page_offset(page);
 	if (latter >= PAGE_SIZE)
 		qty = PAGE_SIZE;
 	else
diff -puN fs/buffer.c~fix-possible-page_cache_shift-overflows fs/buffer.c
--- devel/fs/buffer.c~fix-possible-page_cache_shift-overflows	2006-01-08 00:56:54.000000000 -0800
+++ devel-akpm/fs/buffer.c	2006-01-08 00:56:54.000000000 -0800
@@ -1762,7 +1762,7 @@ static int __block_write_full_page(struc
 	 * handle that here by just cleaning them.
 	 */
 
-	block = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
+	block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
 	head = page_buffers(page);
 	bh = head;
 
@@ -2635,7 +2635,7 @@ int block_truncate_page(struct address_s
 	pgoff_t index = from >> PAGE_CACHE_SHIFT;
 	unsigned offset = from & (PAGE_CACHE_SIZE-1);
 	unsigned blocksize;
-	pgoff_t iblock;
+	sector_t iblock;
 	unsigned length, pos;
 	struct inode *inode = mapping->host;
 	struct page *page;
@@ -2651,7 +2651,7 @@ int block_truncate_page(struct address_s
 		return 0;
 
 	length = blocksize - length;
-	iblock = index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
+	iblock = (sector_t)index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
 	
 	page = grab_cache_page(mapping, index);
 	err = -ENOMEM;
diff -puN fs/freevxfs/vxfs_immed.c~fix-possible-page_cache_shift-overflows fs/freevxfs/vxfs_immed.c
--- devel/fs/freevxfs/vxfs_immed.c~fix-possible-page_cache_shift-overflows	2006-01-08 00:56:54.000000000 -0800
+++ devel-akpm/fs/freevxfs/vxfs_immed.c	2006-01-08 00:56:54.000000000 -0800
@@ -99,8 +99,8 @@ 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 = pp->index << PAGE_CACHE_SHIFT;
-	caddr_t			kaddr;
+	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);
diff -puN fs/jffs/inode-v23.c~fix-possible-page_cache_shift-overflows fs/jffs/inode-v23.c
--- devel/fs/jffs/inode-v23.c~fix-possible-page_cache_shift-overflows	2006-01-08 00:56:54.000000000 -0800
+++ devel-akpm/fs/jffs/inode-v23.c	2006-01-08 00:56:54.000000000 -0800
@@ -757,7 +757,7 @@ jffs_do_readpage_nolock(struct file *fil
 
 	read_len = 0;
 	result = 0;
-	offset = page->index << PAGE_CACHE_SHIFT;
+	offset = page_offset(page);
 
 	kmap(page);
 	buf = page_address(page);
@@ -1545,7 +1545,7 @@ jffs_commit_write(struct file *filp, str
 {
        void *addr = page_address(page) + from;
        /* XXX: PAGE_CACHE_SHIFT or PAGE_SHIFT */
-       loff_t pos = (page->index<<PAGE_CACHE_SHIFT) + from;
+       loff_t pos = page_offset(page) + from;
 
        return jffs_file_write(filp, addr, to-from, &pos);
 } /* jffs_commit_write() */
diff -puN fs/mpage.c~fix-possible-page_cache_shift-overflows fs/mpage.c
--- devel/fs/mpage.c~fix-possible-page_cache_shift-overflows	2006-01-08 00:56:54.000000000 -0800
+++ devel-akpm/fs/mpage.c	2006-01-08 00:56:54.000000000 -0800
@@ -184,7 +184,7 @@ do_mpage_readpage(struct bio *bio, struc
 	if (page_has_buffers(page))
 		goto confused;
 
-	block_in_file = page->index << (PAGE_CACHE_SHIFT - blkbits);
+	block_in_file = (sector_t)page->index << (PAGE_CACHE_SHIFT - blkbits);
 	last_block = (i_size_read(inode) + blocksize - 1) >> blkbits;
 
 	bh.b_page = page;
@@ -466,7 +466,7 @@ __mpage_writepage(struct bio *bio, struc
 	 * The page has no buffers: map it to disk
 	 */
 	BUG_ON(!PageUptodate(page));
-	block_in_file = page->index << (PAGE_CACHE_SHIFT - blkbits);
+	block_in_file = (sector_t)page->index << (PAGE_CACHE_SHIFT - blkbits);
 	last_block = (i_size - 1) >> blkbits;
 	map_bh.b_page = page;
 	for (page_block = 0; page_block < blocks_per_page; ) {
diff -puN fs/romfs/inode.c~fix-possible-page_cache_shift-overflows fs/romfs/inode.c
--- devel/fs/romfs/inode.c~fix-possible-page_cache_shift-overflows	2006-01-08 00:56:54.000000000 -0800
+++ devel-akpm/fs/romfs/inode.c	2006-01-08 00:56:54.000000000 -0800
@@ -418,7 +418,7 @@ static int
 romfs_readpage(struct file *file, struct page * page)
 {
 	struct inode *inode = page->mapping->host;
-	unsigned long offset, avail, readlen;
+	loff_t offset, avail, readlen;
 	void *buf;
 	int result = -EIO;
 
@@ -429,8 +429,8 @@ romfs_readpage(struct file *file, struct
 		goto err_out;
 
 	/* 32 bit warning -- but not for us :) */
-	offset = page->index << PAGE_CACHE_SHIFT;
-	if (offset < inode->i_size) {
+	offset = page_offset(page);
+	if (offset < i_size_read(inode)) {
 		avail = inode->i_size-offset;
 		readlen = min_t(unsigned long, avail, PAGE_SIZE);
 		if (romfs_copyfrom(inode, buf, ROMFS_I(inode)->i_dataoffset+offset, readlen) == readlen) {
diff -puN fs/smbfs/file.c~fix-possible-page_cache_shift-overflows fs/smbfs/file.c
--- devel/fs/smbfs/file.c~fix-possible-page_cache_shift-overflows	2006-01-08 00:56:54.000000000 -0800
+++ devel-akpm/fs/smbfs/file.c	2006-01-08 00:56:54.000000000 -0800
@@ -209,8 +209,8 @@ smb_updatepage(struct file *file, struct
 {
 	struct dentry *dentry = file->f_dentry;
 
-	DEBUG1("(%s/%s %d@%ld)\n", DENTRY_PATH(dentry), 
-	       count, (page->index << PAGE_CACHE_SHIFT)+offset);
+	DEBUG1("(%s/%s %d@%lld)\n", DENTRY_PATH(dentry), count,
+		((unsigned long long)page->index << PAGE_CACHE_SHIFT) + offset);
 
 	return smb_writepage_sync(dentry->d_inode, page, offset, count);
 }
diff -puN fs/sysv/dir.c~fix-possible-page_cache_shift-overflows fs/sysv/dir.c
--- devel/fs/sysv/dir.c~fix-possible-page_cache_shift-overflows	2006-01-08 00:56:54.000000000 -0800
+++ devel-akpm/fs/sysv/dir.c	2006-01-08 00:56:54.000000000 -0800
@@ -103,7 +103,7 @@ static int sysv_readdir(struct file * fi
 			offset = (char *)de - kaddr;
 
 			over = filldir(dirent, name, strnlen(name,SYSV_NAMELEN),
-					(n<<PAGE_CACHE_SHIFT) | offset,
+					((loff_t)n<<PAGE_CACHE_SHIFT) | offset,
 					fs16_to_cpu(SYSV_SB(sb), de->inode),
 					DT_UNKNOWN);
 			if (over) {
@@ -115,7 +115,7 @@ static int sysv_readdir(struct file * fi
 	}
 
 done:
-	filp->f_pos = (n << PAGE_CACHE_SHIFT) | offset;
+	filp->f_pos = ((loff_t)n << PAGE_CACHE_SHIFT) | offset;
 	unlock_kernel();
 	return 0;
 }
_

Patches currently in -mm which might be from akpm@osdl.org are

linus.patch
lxdialog-sane-colours.patch
git-acpi.patch
git-audit.patch
git-blkdev-fixup.patch
git-cfq-fixup.patch
git-drm-radeon-warning-fixes.patch
git-drm-build-fix.patch
git-drm-via_dmablit-build-fix.patch
git-libata-all-fixup.patch
git-libata-all-pata_amd-build-fix.patch
swsusp-resume-parsing-fix.patch
fix-sys-class-net-if-wireless-without-dev-get_wireless_stats-fix.patch
shrink-dentry-struct-spufs-fix.patch
revert-gregkh-pci-shot-accross-the-bow.patch
msix-save-restore-for-suspend-resume-fix.patch
git-scsi-misc-fixup.patch
git-sas-jg.patch
gregkh-usb-usbip-build-fix.patch
gregkh-usb-usbip-more-dead-code.patch
git-watchdog.patch
x86_64-cpufreq-constant-tsc-fix.patch
acx1xx-wireless-driver-usb-is-bust.patch
acx1xx-allow-modular-build.patch
acx1xx-wireless-driver-spy_offset-went-away.patch
tiacx-usb_driver-build-fix.patch
smbfs-readdir-vs-signal-fix.patch
ext3_readdir-use-generic-readahead.patch
jbd-fix-transaction-batching.patch
shrinks-sizeoffiles_struct-and-better-layout-tidy.patch
avoid-taking-global-tasklist_lock-for-single-threadedprocess-at-getrusage-tidy.patch
dump_thread-cleanup-fix.patch
remove-ext2-xattr-permission-checks-warning-fixes.patch
remove-xfs-xattr-permission-checks-warning-fixes.patch
replace-inode_update_time-with-file_update_time-switch-ntfs-to-touch_atime.patch
ocfs-update-atime-borkage.patch
mutex-subsystem-semaphore-to-mutex-vfs-i_sem-fixes.patch
edac-atomic-scrub-operations.patch
edac-with-sysfs-interface-added-tidy.patch
hrtimer-move-div_long_long_rem-out-of-jiffiesh-sparc64-fix.patch
hrtimer-export-deinlined-mktime.patch
time-fix-cpu-frequency-detection.patch
dlm-use-configfs-fix.patch
reiser4-only.patch
reiser4-swsusp-build-fix.patch
reiser4-printk-warning-fix.patch
reiser4-mm-remove-pg_highmem-fix.patch
reiser4-page-private-fixes.patch
reiser4-big-update-div64-fix.patch
reiser4-remove-c99isms.patch
reiser4_releasepage-gfp_t-fixes.patch
reiser4-big-update-update_atime-fixes.patch
add-sysfs-entry-to-disable-framebuffer-access-tidy.patch
non-linear-frame-buffer-read-write-access-tidy.patch
md-dm-reduce-stack-usage-with-stacked-block-devices-fixes.patch
nr_blockdev_pages-in_interrupt-warning.patch
sysfs-crash-debugging.patch
device-suspend-debug.patch
tty-layer-buffering-revamp-jsm-is-broken.patch
tty-layer-buffering-revamp-pmac_zilog-warning-fix.patch
tty-layer-buffering-revamp-sunsab-build-fix.patch
isicom-pci-probing-added-fix-vs-gregkh-pci-pci-driver-owner-removal.patch


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