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authorAndrew Morton <akpm@osdl.org>2006-01-08 01:03:05 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-08 20:13:54 -0800
commit54b21a7992a31d30c9a91f7e0a00ffdb4bd0caee (patch)
tree33eca2bf3c1edfd3d76cc0f7c96a392239c6d2ec /fs/afs
parent676121fcb66c861804e38d94214fd5670a1ef595 (diff)
downloadop-kernel-dev-54b21a7992a31d30c9a91f7e0a00ffdb4bd0caee.zip
op-kernel-dev-54b21a7992a31d30c9a91f7e0a00ffdb4bd0caee.tar.gz
[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/afs')
-rw-r--r--fs/afs/dir.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 6682d6d..5c61c24 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -137,7 +137,7 @@ static inline void afs_dir_check_page(struct inode *dir, struct page *page)
#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
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