Date:	Thu, 17 Oct 2013 00:36:41 +0200
From:	Péter András Felvégi <petschy@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] udf: fix for pathetic mount times in case of invalid file system

From: Peter A. Felvegi <petschy@...il.com>

The UDF driver was not strict enough about checking the IDs in the
VSDs when mounting, which resulted in reading through all the sectors
of the block device in some unfortunate cases. Eg, trying to mount my
uninitialized 200G SSD partition (all 0xFF bytes) took ~350 minutes to
fail, because the code expected some of the valid IDs or a zero byte.
During this, the mount couldn't be killed, sync from the cmdline
blocked, and the machine froze into the shutdown. Valid filesystems
(extX, btrfs, ntfs) were rejected by the mere accident of having a
zero byte at just the right place in some of their sectors, close
enough to the beginning not to generate excess I/O. The fix adds a
hard limit on the VSD sector offset, adds the two missing VSD IDs, and
stops scanning when encountering an invalid ID. Also replaced the
magic number 32768 with a more meaningful #define, and supressed the
bogus message about failing to read the first sector if no UDF fs was
detected.

Signed-off-by: Peter A. Felvegi <petschy@...il.com>
---
The fix was developed for 3.9.4, and applies to 3.12-rc3, too.

--- linux.git/fs/udf/super.c.orig    2013-10-16 23:23:33.000000000 +0200
+++ linux.git/fs/udf/super.c    2013-10-16 23:27:21.000000000 +0200
@@ -76,6 +76,9 @@

 #define UDF_DEFAULT_BLOCKSIZE 2048

+#define VSD_FIRST_SECTOR_OFFSET        32768
+#define VSD_MAX_SECTOR_OFFSET        0x800000
+
 enum { UDF_MAX_LINKS = 0xffff };

 /* These are the "meat" - everything else is stuffing */
@@ -672,7 +675,7 @@ out_unlock:
 static loff_t udf_check_vsd(struct super_block *sb)
 {
     struct volStructDesc *vsd = NULL;
-    loff_t sector = 32768;
+    loff_t sector = VSD_FIRST_SECTOR_OFFSET;
     int sectorsize;
     struct buffer_head *bh = NULL;
     int nsr02 = 0;
@@ -690,8 +693,14 @@ static loff_t udf_check_vsd(struct super
     udf_debug("Starting at sector %u (%ld byte sectors)\n",
           (unsigned int)(sector >> sb->s_blocksize_bits),
           sb->s_blocksize);
-    /* Process the sequence (if applicable) */
-    for (; !nsr02 && !nsr03; sector += sectorsize) {
+    /* Process the sequence (if applicable). The hard limit on the
sector offset is arbitrary,
+     * hopefully large enough so that all valid UDF filesystems will
be recognised. There is no
+     * mention of an upper bound to the size of the volume
recognition area in the standard.
+     *  The limit will prevent the code to read all the sectors of a
specially crafted image
+     * (like a bluray disc full of CD001 sectors), potentially
causing minutes or even hours of
+     * uninterruptible I/O activity. This actually happened with
uninitialised SSD partitions
+     * (all 0xFF) before the check for the limit and all valid IDs
were added */
+    for (; !nsr02 && !nsr03 && sector < VSD_MAX_SECTOR_OFFSET; sector
+= sectorsize) {
         /* Read a block */
         bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
         if (!bh)
@@ -701,10 +710,7 @@ static loff_t udf_check_vsd(struct super
         vsd = (struct volStructDesc *)(bh->b_data +
                           (sector & (sb->s_blocksize - 1)));

-        if (vsd->stdIdent[0] == 0) {
-            brelse(bh);
-            break;
-        } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
+        if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
                     VSD_STD_ID_LEN)) {
             switch (vsd->structType) {
             case 0:
@@ -740,6 +746,17 @@ static loff_t udf_check_vsd(struct super
         else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
                     VSD_STD_ID_LEN))
             nsr03 = sector;
+        else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BOOT2,
+                    VSD_STD_ID_LEN))
+            ; /* nothing */
+        else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CDW02,
+                    VSD_STD_ID_LEN))
+            ; /* nothing */
+        else {
+            /* invalid id : end of volume recognition area */
+            brelse(bh);
+            break;
+        }
         brelse(bh);
     }

@@ -747,7 +764,7 @@ static loff_t udf_check_vsd(struct super
         return nsr03;
     else if (nsr02)
         return nsr02;
-    else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
+    else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits)
== VSD_FIRST_SECTOR_OFFSET)
         return -1;
     else
         return 0;
@@ -1239,6 +1256,9 @@ static int udf_load_partdesc(struct supe
      * PHYSICAL partitions are already set up
      */
     type1_idx = i;
+#ifdef UDFFS_DEBUG
+    map = NULL; /* supress 'maybe used uninitialized' warning */
+#endif
     for (i = 0; i < sbi->s_partitions; i++) {
         map = &sbi->s_partmaps[i];

@@ -1819,7 +1839,7 @@ static int udf_load_vrs(struct super_blo
             return 0;
         }
         if (nsr_off == -1)
-            udf_debug("Failed to read byte 32768. Assuming open disc.
Skipping validity check\n");
+            udf_debug("Failed to read sector at offset %d. Assuming
open disc. Skipping validity check\n", VSD_FIRST_SECTOR_OFFSET);
         if (!sbi->s_last_block)
             sbi->s_last_block = udf_get_last_block(sb);
     } else {
--
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