From: Stefan Richter <stefanr@s5r6.in-berlin.de>
To: stable@kernel.org
Cc: linux-kernel@vger.kernel.org, Al Viro <viro@zeniv.linux.org.uk>,
James Bottomley <James.Bottomley@SteelEye.com>
Subject: [PATCH 2.6.15.4 update] sd: fix memory corruption with broken mode page headers
Date: Mon, 27 Feb 2006 00:16:10 +0100 (CET) [thread overview]
Message-ID: <tkrat.ac90e0d775a5c272@s5r6.in-berlin.de> (raw)
In-Reply-To: <4400E34B.1000400@s5r6.in-berlin.de>
sd: fix memory corruption with broken mode page headers
There's a problem in sd where we blindly believe the length of the
headers and block descriptors. Some devices return insane values for
these and cause our length to end up greater than the actual buffer
size, so check to make sure.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Also removed the buffer size magic number (512) and added DPOFUA of
zero to the defaults
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
rediff for 2.6.15.x without DPOFUA bit, taken from commit
489708007785389941a89fa06aedc5ec53303c96
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
---
fixes http://bugzilla.kernel.org/show_bug.cgi?id=6114 and
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=182005
Index: linux-2.6.15.4/drivers/scsi/sd.c
===================================================================
--- linux-2.6.15.4.orig/drivers/scsi/sd.c 2006-02-26 23:58:40.000000000 +0100
+++ linux-2.6.15.4/drivers/scsi/sd.c 2006-02-27 00:03:07.000000000 +0100
@@ -88,6 +88,11 @@
#define SD_MAX_RETRIES 5
#define SD_PASSTHROUGH_RETRIES 1
+/*
+ * Size of the initial data buffer for mode and read capacity data
+ */
+#define SD_BUF_SIZE 512
+
static void scsi_disk_release(struct kref *kref);
struct scsi_disk {
@@ -1299,7 +1304,7 @@ sd_do_mode_sense(struct scsi_device *sdp
/*
* read write protect setting, if possible - called only in sd_revalidate_disk()
- * called with buffer of length 512
+ * called with buffer of length SD_BUF_SIZE
*/
static void
sd_read_write_protect_flag(struct scsi_disk *sdkp, char *diskname,
@@ -1357,7 +1362,7 @@ sd_read_write_protect_flag(struct scsi_d
/*
* sd_read_cache_type - called only from sd_revalidate_disk()
- * called with buffer of length 512
+ * called with buffer of length SD_BUF_SIZE
*/
static void
sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
@@ -1402,6 +1407,8 @@ sd_read_cache_type(struct scsi_disk *sdk
/* Take headers and block descriptors into account */
len += data.header_length + data.block_descriptor_length;
+ if (len > SD_BUF_SIZE)
+ goto bad_sense;
/* Get the data */
res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
@@ -1414,6 +1421,12 @@ sd_read_cache_type(struct scsi_disk *sdk
int ct = 0;
int offset = data.header_length + data.block_descriptor_length;
+ if (offset >= SD_BUF_SIZE - 2) {
+ printk(KERN_ERR "%s: malformed MODE SENSE response",
+ diskname);
+ goto defaults;
+ }
+
if ((buffer[offset] & 0x3f) != modepage) {
printk(KERN_ERR "%s: got wrong page\n", diskname);
goto defaults;
@@ -1472,7 +1485,7 @@ static int sd_revalidate_disk(struct gen
if (!scsi_device_online(sdp))
goto out;
- buffer = kmalloc(512, GFP_KERNEL | __GFP_DMA);
+ buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL | __GFP_DMA);
if (!buffer) {
printk(KERN_WARNING "(sd_revalidate_disk:) Memory allocation "
"failure.\n");
next prev parent reply other threads:[~2006-02-26 23:18 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-23 1:02 [PATCH 1/2] sd: fix memory corruption by sd_read_cache_type Stefan Richter
2006-02-25 2:10 ` [stable] " Chris Wright
2006-02-25 23:07 ` Stefan Richter
2006-02-25 23:22 ` Al Viro
2006-02-26 8:11 ` Stefan Richter
2006-02-26 8:22 ` Al Viro
2006-02-26 9:11 ` Stefan Richter
2006-02-26 0:01 ` Linus Torvalds
2006-02-26 0:17 ` Al Viro
2006-02-26 0:39 ` Linus Torvalds
2006-02-26 8:39 ` Jeff Garzik
2006-02-26 9:00 ` Al Viro
2006-02-26 10:45 ` Jeff Garzik
2006-02-26 11:47 ` Al Viro
2006-02-26 5:14 ` James Bottomley
2006-02-26 5:31 ` Al Viro
2006-02-26 8:29 ` Stefan Richter
2006-02-26 14:34 ` James Bottomley
2006-02-26 14:57 ` Al Viro
2006-02-26 16:21 ` Stefan Richter
2006-02-26 23:16 ` Stefan Richter [this message]
2006-02-27 20:25 ` [stable] [PATCH 2.6.15.4 update] sd: fix memory corruption with broken mode page headers Chris Wright
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