linux-ext4 - [PATCH 04/25] libext2fs: reject 64bit badblocks numbers

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Date:	Thu, 17 Oct 2013 21:49:22 -0700
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	tytso@....edu, darrick.wong@...cle.com
Cc:	linux-ext4@...r.kernel.org
Subject: [PATCH 04/25] libext2fs: reject 64bit badblocks numbers

Don't accept block numbers larger than 2^32 for the badblocks list,
and don't run badblocks on them either.

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 lib/ext2fs/read_bb_file.c |    7 +++++--
 misc/badblocks.c          |   17 ++++++++++++++++-
 2 files changed, 21 insertions(+), 3 deletions(-)


diff --git a/lib/ext2fs/read_bb_file.c b/lib/ext2fs/read_bb_file.c
index 7d7bb7a..4a498d2 100644
--- a/lib/ext2fs/read_bb_file.c
+++ b/lib/ext2fs/read_bb_file.c
@@ -39,7 +39,7 @@ errcode_t ext2fs_read_bb_FILE2(ext2_filsys fs, FILE *f,
 					       void *priv_data))
 {
 	errcode_t	retval;
-	blk_t		blockno;
+	blk64_t		blockno;
 	int		count;
 	char		buf[128];
 
@@ -55,9 +55,12 @@ errcode_t ext2fs_read_bb_FILE2(ext2_filsys fs, FILE *f,
 	while (!feof (f)) {
 		if (fgets(buf, sizeof(buf), f) == NULL)
 			break;
-		count = sscanf(buf, "%u", &blockno);
+		count = sscanf(buf, "%llu", &blockno);
 		if (count <= 0)
 			continue;
+		/* Badblocks isn't going to be updated for 64bit */
+		if (blockno > 1ULL << 32)
+			return EOVERFLOW;
 		if (fs &&
 		    ((blockno < fs->super->s_first_data_block) ||
 		     (blockno >= ext2fs_blocks_count(fs->super)))) {
diff --git a/misc/badblocks.c b/misc/badblocks.c
index c9e47c7..802080c 100644
--- a/misc/badblocks.c
+++ b/misc/badblocks.c
@@ -1047,6 +1047,7 @@ int main (int argc, char ** argv)
 				  unsigned int);
 	int open_flag;
 	long sysval;
+	blk64_t inblk;
 
 	setbuf(stdout, NULL);
 	setbuf(stderr, NULL);
@@ -1204,6 +1205,13 @@ int main (int argc, char ** argv)
 		     (unsigned long) first_block, (unsigned long) last_block);
 	    exit (1);
 	}
+	/* ext2 badblocks file can't handle large values */
+	if ((blk64_t)last_block >= 1ULL << 32) {
+		com_err(program_name, EOVERFLOW,
+			_("invalid end block (%lu): must be less than %llu"),
+			(unsigned long)last_block, 1ULL << 32);
+		exit(1);
+	}
 	if (w_flag)
 		check_mount(device_name);
 
@@ -1262,13 +1270,20 @@ int main (int argc, char ** argv)
 
 	if (in) {
 		for(;;) {
-			switch(fscanf (in, "%u\n", &next_bad)) {
+			switch (fscanf(in, "%llu\n", &inblk)) {
 				case 0:
 					com_err (program_name, 0, "input file - bad format");
 					exit (1);
 				case EOF:
 					break;
 				default:
+					if (inblk > 1ULL << 32) {
+						com_err(program_name,
+							EOVERFLOW,
+							_("while adding to in-memory bad block list"));
+						exit(1);
+					}
+					next_bad = inblk;
 					errcode = ext2fs_badblocks_list_add(bb_list,next_bad);
 					if (errcode) {
 						com_err (program_name, errcode, _("while adding to in-memory bad block list"));

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