linux-kernel - Re: [syzbot] [PATCH] Test oob in squashfs readahead

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Message-ID: <00000000000028efe8060a181604@google.com>
Date:   Mon, 13 Nov 2023 23:53:47 -0800
From:   syzbot <syzbot+604424eb051c2f696163@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [PATCH] Test oob in squashfs readahead

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***

Subject: [PATCH] Test oob in squashfs readahead
Author: eadavis@...com

please test squashfs readahead oob

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 13d88ac54ddd

diff --git a/fs/squashfs/block.c b/fs/squashfs/block.c
index 581ce9519339..1c7c5500206b 100644
--- a/fs/squashfs/block.c
+++ b/fs/squashfs/block.c
@@ -314,9 +314,11 @@ int squashfs_read_data(struct super_block *sb, u64 index, int length,
 		bio_uninit(bio);
 		kfree(bio);
 
+		printk("datal: %d \n", length);
 		compressed = SQUASHFS_COMPRESSED(length);
 		length = SQUASHFS_COMPRESSED_SIZE(length);
 		index += 2;
+		printk("datal2: %d, c:%d, i:%d \n", length, compressed, index);
 
 		TRACE("Block @ 0x%llx, %scompressed size %d\n", index - 2,
 		      compressed ? "" : "un", length);
@@ -324,6 +326,7 @@ int squashfs_read_data(struct super_block *sb, u64 index, int length,
 	if (length < 0 || length > output->length ||
 			(index + length) > msblk->bytes_used) {
 		res = -EIO;
+		printk("srd: l:%d, ol: %d, bu: %d \n", length, output->length, msblk->bytes_used);
 		goto out;
 	}
 
@@ -340,6 +343,7 @@ int squashfs_read_data(struct super_block *sb, u64 index, int length,
 			goto out_free_bio;
 		}
 		res = msblk->thread_ops->decompress(msblk, bio, offset, length, output);
+		printk("srd6: r: %d \n", res);
 	} else {
 		res = copy_bio_to_actor(bio, output, offset, length);
 	}
diff --git a/fs/squashfs/cache.c b/fs/squashfs/cache.c
index 5062326d0efb..dac9eedea868 100644
--- a/fs/squashfs/cache.c
+++ b/fs/squashfs/cache.c
@@ -340,6 +340,7 @@ int squashfs_read_metadata(struct super_block *sb, void *buffer,
 	if (unlikely(length < 0))
 		return -EIO;
 
+	printk("srm: %d\n", length);
 	while (length) {
 		entry = squashfs_cache_get(sb, msblk->block_cache, *block, 0);
 		if (entry->error) {
@@ -381,6 +382,7 @@ struct squashfs_cache_entry *squashfs_get_fragment(struct super_block *sb,
 {
 	struct squashfs_sb_info *msblk = sb->s_fs_info;
 
+	printk("sgf: %d\n", length);
 	return squashfs_cache_get(sb, msblk->fragment_cache, start_block,
 		length);
 }
@@ -396,6 +398,7 @@ struct squashfs_cache_entry *squashfs_get_datablock(struct super_block *sb,
 {
 	struct squashfs_sb_info *msblk = sb->s_fs_info;
 
+	printk("sgd: %d\n", length);
 	return squashfs_cache_get(sb, msblk->read_page, start_block, length);
 }
 
diff --git a/fs/squashfs/file.c b/fs/squashfs/file.c
index 8ba8c4c50770..b54d6b993357 100644
--- a/fs/squashfs/file.c
+++ b/fs/squashfs/file.c
@@ -461,6 +461,12 @@ static int squashfs_read_folio(struct file *file, struct folio *folio)
 	TRACE("Entered squashfs_readpage, page index %lx, start block %llx\n",
 				page->index, squashfs_i(inode)->start);
 
+	if (!file_end) {
+		printk("i:%p, is:%d, %s\n", inode, i_size_read(inode), __func__);
+		res = -EINVAL;
+		goto out;
+	}
+
 	if (page->index >= ((i_size_read(inode) + PAGE_SIZE - 1) >>
 					PAGE_SHIFT))
 		goto out;
@@ -547,6 +553,11 @@ static void squashfs_readahead(struct readahead_control *ractl)
 	int i, file_end = i_size_read(inode) >> msblk->block_log;
 	unsigned int max_pages = 1UL << shift;
 
+	if (!file_end && !start) {
+		printk("i:%p, is:%d, %s\n", inode, i_size_read(inode), __func__);
+		return;
+	}
+
 	readahead_expand(ractl, start, (len | mask) + 1);
 
 	pages = kmalloc_array(max_pages, sizeof(void *), GFP_KERNEL);
diff --git a/fs/squashfs/inode.c b/fs/squashfs/inode.c
index aa3411354e66..f3b0111e6fbd 100644
--- a/fs/squashfs/inode.c
+++ b/fs/squashfs/inode.c
@@ -175,6 +175,7 @@ int squashfs_read_inode(struct inode *inode, long long ino)
 		u64 frag_blk;
 		struct squashfs_lreg_inode *sqsh_ino = &squashfs_ino.lreg;
 
+		printk("in0: %p, fs: %d, it: %d, %s\n", inode, inode->i_size, type, __func__);
 		err = squashfs_read_metadata(sb, sqsh_ino, &block, &offset,
 							sizeof(*sqsh_ino));
 		if (err < 0)
@@ -403,6 +404,7 @@ int squashfs_read_inode(struct inode *inode, long long ino)
 	} else
 		squashfs_i(inode)->xattr_count = 0;
 
+	printk("in: %p, fs: %d, it: %d, %s\n", inode, inode->i_size, type, __func__);
 	return 0;
 
 failed_read: