[PATCH 1/2] squashfs metadata 2: electric boogaloo

[Paolo Pisati]

From: Linus Torvalds <torvalds at linux-foundation.org>

Anatoly continues to find issues with fuzzed squashfs images.

This time, corrupt, missing, or undersized data for the page filling
wasn't checked for, because the squashfs_{copy,read}_cache() functions
did the squashfs_copy_data() call without checking the resulting data
size.

Which could result in the page cache pages being incompletely filled in,
and no error indication to the user space reading garbage data.

So make a helper function for the "fill in pages" case, because the
exact same incomplete sequence existed in two places.

[ I should have made a squashfs branch for these things, but I didn't
  intend to start doing them in the first place.

  My historical connection through cramfs is why I got into looking at
  these issues at all, and every time I (continue to) think it's a
  one-off.

  Because _this_ time is always the last time. Right?   - Linus ]

Reported-by: Anatoly Trosinenko <anatoly.trosinenko at gmail.com>
Tested-by: Willy Tarreau <w at 1wt.eu>
Cc: Al Viro <viro at zeniv.linux.org.uk>
Cc: Phillip Lougher <phillip at squashfs.org.uk>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
(cherry picked from commit cdbb65c4c7ead680ebe54f4f0d486e2847a500ea)
Signed-off-by: Paolo Pisati <paolo.pisati at canonical.com>
---
 fs/squashfs/file.c        | 25 ++++++++++++++++++-------
 fs/squashfs/file_direct.c |  8 +-------
 fs/squashfs/squashfs.h    |  1 +
 3 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/fs/squashfs/file.c b/fs/squashfs/file.c
index 1ec7bae2..fa3eb0a 100644
--- a/fs/squashfs/file.c
+++ b/fs/squashfs/file.c
@@ -374,13 +374,29 @@ static int read_blocklist(struct inode *inode, int index, u64 *block)
 	return squashfs_block_size(size);
 }
 
+void squashfs_fill_page(struct page *page, struct squashfs_cache_entry *buffer, int offset, int avail)
+{
+	int copied;
+	void *pageaddr;
+
+	pageaddr = kmap_atomic(page);
+	copied = squashfs_copy_data(pageaddr, buffer, offset, avail);
+	memset(pageaddr + copied, 0, PAGE_CACHE_SIZE - copied);
+	kunmap_atomic(pageaddr);
+
+	flush_dcache_page(page);
+	if (copied == avail)
+		SetPageUptodate(page);
+	else
+		SetPageError(page);
+}
+
 /* Copy data into page cache  */
 void squashfs_copy_cache(struct page *page, struct squashfs_cache_entry *buffer,
 	int bytes, int offset)
 {
 	struct inode *inode = page->mapping->host;
 	struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info;
-	void *pageaddr;
 	int i, mask = (1 << (msblk->block_log - PAGE_CACHE_SHIFT)) - 1;
 	int start_index = page->index & ~mask, end_index = start_index | mask;
 
@@ -406,12 +422,7 @@ void squashfs_copy_cache(struct page *page, struct squashfs_cache_entry *buffer,
 		if (PageUptodate(push_page))
 			goto skip_page;
 
-		pageaddr = kmap_atomic(push_page);
-		squashfs_copy_data(pageaddr, buffer, offset, avail);
-		memset(pageaddr + avail, 0, PAGE_CACHE_SIZE - avail);
-		kunmap_atomic(pageaddr);
-		flush_dcache_page(push_page);
-		SetPageUptodate(push_page);
+		squashfs_fill_page(push_page, buffer, offset, avail);
 skip_page:
 		unlock_page(push_page);
 		if (i != page->index)
diff --git a/fs/squashfs/file_direct.c b/fs/squashfs/file_direct.c
index 43e7a7e..f4fcb8c 100644
--- a/fs/squashfs/file_direct.c
+++ b/fs/squashfs/file_direct.c
@@ -144,7 +144,6 @@ static int squashfs_read_cache(struct page *target_page, u64 block, int bsize,
 	struct squashfs_cache_entry *buffer = squashfs_get_datablock(i->i_sb,
 						 block, bsize);
 	int bytes = buffer->length, res = buffer->error, n, offset = 0;
-	void *pageaddr;
 
 	if (res) {
 		ERROR("Unable to read page, block %llx, size %x\n", block,
@@ -159,12 +158,7 @@ static int squashfs_read_cache(struct page *target_page, u64 block, int bsize,
 		if (page[n] == NULL)
 			continue;
 
-		pageaddr = kmap_atomic(page[n]);
-		squashfs_copy_data(pageaddr, buffer, offset, avail);
-		memset(pageaddr + avail, 0, PAGE_CACHE_SIZE - avail);
-		kunmap_atomic(pageaddr);
-		flush_dcache_page(page[n]);
-		SetPageUptodate(page[n]);
+		squashfs_fill_page(page[n], buffer, offset, avail);
 		unlock_page(page[n]);
 		if (page[n] != target_page)
 			page_cache_release(page[n]);
diff --git a/fs/squashfs/squashfs.h b/fs/squashfs/squashfs.h
index 887d6d2..d8d4372 100644
--- a/fs/squashfs/squashfs.h
+++ b/fs/squashfs/squashfs.h
@@ -67,6 +67,7 @@ extern __le64 *squashfs_read_fragment_index_table(struct super_block *,
 				u64, u64, unsigned int);
 
 /* file.c */
+void squashfs_fill_page(struct page *, struct squashfs_cache_entry *, int, int);
 void squashfs_copy_cache(struct page *, struct squashfs_cache_entry *, int,
 				int);
 
-- 
2.7.4