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[dm-devel] Re: Bug#403426: kernel corrupts LUKS partition header on arm



* Clemens Fruhwirth <clemens endorphin org> [2006-12-29 11:52]:
> I just added the r!=bsize case to error checking and an error message
> as well.
...
> The changes are also in subversion.

This particular change didn't make any difference.  I still get the
header conversion message when I only apply the patch from utils.c.


#! /bin/sh /usr/share/dpatch/dpatch-run
## 02_fix_arm.dpatch by Clemens Fruhwirth <clemens endorphin org>
##
## DP: Add error checking to read_blockwise for short reads.
## DP: Commit a patch that fixes http://bugs.debian.org/403075

@DPATCH@
Index: lib/utils.c
===================================================================
--- cryptsetup-1.0.4~/lib/utils.c	(revision 1)
+++ cryptsetup-1.0.4/lib/utils.c	(working copy)
@@ -151,8 +151,10 @@
 static int sector_size(int fd) 
 {
 	int bsize;
-	ioctl(fd,BLKSSZGET, &bsize);
-	return bsize;
+	if (ioctl(fd,BLKSSZGET, &bsize) < 0)
+		return -EINVAL;
+	else
+		return bsize;
 }
 
 int sector_size_for_device(const char *device)
@@ -171,8 +173,11 @@
 	char *padbuf; char *padbuf_base;
 	char *buf = (char *)orig_buf;
 	int r;
-	int hangover; int solid; int bsize = sector_size(fd);
+	int hangover; int solid; int bsize;
 
+	if ((bsize = sector_size(fd)) < 0)
+		return bsize;
+
 	hangover = count % bsize;
 	solid = count - hangover;
 
@@ -209,15 +214,20 @@
 	char *buf = (char *)orig_buf;
 	int r;
 	int step;
-	int bsize = sector_size(fd);
+	int bsize;
 
+	if ((bsize = sector_size(fd)) < 0)
+		return bsize;
+
 	padbuf = aligned_malloc(&padbuf_base, bsize, bsize);
 	if(padbuf == NULL) return -ENOMEM;
 
 	while(count) {
 		r = read(fd,padbuf,bsize);
-		if(r < 0) goto out;
-		
+		if(r < 0 || r != bsize) {
+			fprintf(stderr, "read failed in read_blockwise.\n");
+			goto out;
+		}
 		step = count<bsize?count:bsize;
 		memcpy(buf,padbuf,step);
 		buf += step;
@@ -242,6 +252,9 @@
 	int frontHang = offset % bsize;
 	int r;
 
+	if (bsize < 0)
+		return bsize;
+
 	lseek(fd, offset - frontHang, SEEK_SET);
 	if(offset % bsize) {
 		int innerCount = count<bsize?count:bsize;

-- 
Martin Michlmayr
http://www.cyrius.com/


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