[PATCH] sd: fix memory corruption with broken mode page headers

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>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 03fcbab30033976abcd4d21f5a2bde5016510ecd..6b967a05c8c11ed1f0dfa81c8fe63621b0eb7a28 100644 (file)
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -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, int dbd, int modepage,
 
 /*
  * 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_disk *sdkp, char *diskname,
 
 /*
  * 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 *sdkp, char *diskname,
 
        /* 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 *sdkp, char *diskname,
                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 gendisk *disk)
        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");