linux-kernel - Re: Two vulnerabilities are founded,please confirm.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID:  <87lkop9j10.fsf@willow.rfc1149.net>
Date:	12 Sep 2006 17:55:23 +0200
From:	Samuel Tardieu <sam@...1149.net>
To:	linux-kernel@...r.kernel.org
Subject:  Re: Two vulnerabilities are founded,please confirm.

>>>>> "ADLab" == ADLab  <adlab@...ustech.com.cn> writes:

ADLab> Advisory: [AD_LAB-06011] Linux kernel Filesystem Mount Dead
ADLab> Loop Class: Design Error

Would a simple fix like this one (untested) work?

Check that the requested block fits in the device.

Fix for advisory AD_LAB-06011 Linux kernel Filesystem Mount Dead Loop.

Signed-off-by: Samuel Tardieu <sam@...1149.net>

diff -r db51efd75e66 fs/buffer.c
--- a/fs/buffer.c	Sun Sep 10 01:02:33 2006 +0200
+++ b/fs/buffer.c	Tue Sep 12 17:54:13 2006 +0200
@@ -1456,7 +1456,17 @@ struct buffer_head *
 struct buffer_head *
 __getblk(struct block_device *bdev, sector_t block, int size)
 {
-	struct buffer_head *bh = __find_get_block(bdev, block, size);
+	struct buffer_head *bh;
+	char b[BDEVNAME_SIZE];
+
+	if (block >= bdev->bd_disk->capacity) {
+		printk(KERN_ERR "Invalid block number %Ld requested on device %s",
+		       (unsigned long long)block,
+		       bdevname(bdev, b));
+		return NULL;
+	}
+
+	bh = __find_get_block(bdev, block, size);
 
 	might_sleep();
 	if (bh == NULL)


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/