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

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Date:   Mon, 13 Nov 2023 03:00:30 -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/file.c b/fs/squashfs/file.c
index 8ba8c4c50770..c91a37be5589 100644
--- a/fs/squashfs/file.c
+++ b/fs/squashfs/file.c
@@ -553,6 +553,9 @@ static void squashfs_readahead(struct readahead_control *ractl)
 	if (!pages)
 		return;
 
+	printk("p: %p, bs: %d, bl: %d, mp: %d, start: %d, fe: %d, %s\n", 
+			pages, msblk->block_size, msblk->block_log,
+			max_pages, start, file_end, __func__);
 	for (;;) {
 		pgoff_t index;
 		int res, bsize;
@@ -566,6 +569,8 @@ static void squashfs_readahead(struct readahead_control *ractl)
 
 		max_pages = (expected + PAGE_SIZE - 1) >> PAGE_SHIFT;
 
+		printk("p: %p, mp: %d, e: %d, idx: %d, s: %d, %s\n", pages, max_pages,
+				expected, pages[0]->index, start, __func__);
 		nr_pages = __readahead_batch(ractl, pages, max_pages);
 		if (!nr_pages)
 			break;
diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
index 22e812808e5c..aad49a62b5ce 100644
--- a/fs/squashfs/super.c
+++ b/fs/squashfs/super.c
@@ -275,6 +275,8 @@ static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc)
 	if (msblk->block_log > SQUASHFS_FILE_MAX_LOG)
 		goto failed_mount;
 
+	printk("bs: %d, bl: %d, %s\n", msblk->block_size, msblk->block_log, __func__);
+
 	/* Check that block_size and block_log match */
 	if (msblk->block_size != (1 << msblk->block_log))
 		goto insanity;