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| author | Andrew Morton <akpm@osdl.org> | 2006-01-08 01:03:05 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-08 20:13:54 -0800 |
| commit | 54b21a7992a31d30c9a91f7e0a00ffdb4bd0caee (patch) | |
| tree | 33eca2bf3c1edfd3d76cc0f7c96a392239c6d2ec /fs/mpage.c | |
| parent | 676121fcb66c861804e38d94214fd5670a1ef595 (diff) | |
| download | kernel_samsung_smdk4412-54b21a7992a31d30c9a91f7e0a00ffdb4bd0caee.tar.gz kernel_samsung_smdk4412-54b21a7992a31d30c9a91f7e0a00ffdb4bd0caee.tar.bz2 kernel_samsung_smdk4412-54b21a7992a31d30c9a91f7e0a00ffdb4bd0caee.zip | |
[PATCH] fix possible PAGE_CACHE_SHIFT overflows
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>
Diffstat (limited to 'fs/mpage.c')
| -rw-r--r-- | fs/mpage.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/mpage.c b/fs/mpage.c index f1d2d02bd4c..e431cb3878d 100644 --- a/fs/mpage.c +++ b/fs/mpage.c @@ -184,7 +184,7 @@ do_mpage_readpage(struct bio *bio, struct page *page, unsigned nr_pages, 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, struct page *page, get_block_t get_block, * 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; ) { |