commit 4d5bca23164d5943bb0f75bdd5e7866af795bb0c
Author: Cliff Wickman <cpw@sgi.com>
Date:   Wed Jun 16 08:51:04 2010 -0500

    makedumpfile: output files filling ramdisk
    
    Tested on SGI UV, which is x86_64.
    
    makedumpfile's path FILENAME_BITMAP "/tmp/..." causes it to try to write
    bitmap files to the ramdisk.  These can be very large if the machine has
    lots of memory, and so writing the file can fail.
    
    (makedumpfile is exec'd by kdumptool. And kdumptool should chroot to
     its --root directory.  But if the intent is to avoid this problem it
     doesn't seem to work.  That may be the proper fix, rather than the below.)
    
    A TMPDIR environment variable is set in the script
    /lib/mkinitrd/scripts/boot-kdump.sh. So this patch assumes that
    the FILENAME_BITMAP path should be based at TMPDIR.
    
    Diffed against makedumpfile-1.3.5
    
    Signed-off-by: Cliff Wickman <cpw@sgi.com>
    Signed-off-by: Masayuki Igawa <igawa@mxs.nes.nec.co.jp>


--- kexec-tools-2.0.0/makedumpfile-1.3.5/makedumpfile.c	2010-07-09 15:14:07.000000000 +0800
+++ kexec-tools-2.0.0/makedumpfile-1.3.5/makedumpfile.c	2010-07-09 15:14:36.000000000 +0800
@@ -959,14 +959,21 @@
 open_dump_bitmap(void)
 {
 	int i, fd;
+	char *tmpname;
 
-	if ((info->name_bitmap
-	    = (char *)malloc(sizeof(FILENAME_BITMAP))) == NULL) {
+	tmpname = getenv("TMPDIR");
+	if (!tmpname)
+		tmpname = "/tmp";
+
+	if ((info->name_bitmap = (char *)malloc(sizeof(FILENAME_BITMAP) +
+						strlen(tmpname) + 1)) == NULL) {
 		ERRMSG("Can't allocate memory for the filename. %s\n",
 		    strerror(errno));
 		return FALSE;
 	}
-	strcpy(info->name_bitmap, FILENAME_BITMAP);
+	strcpy(info->name_bitmap, tmpname);
+	strcat(info->name_bitmap, "/");
+	strcat(info->name_bitmap, FILENAME_BITMAP);
 	if ((fd = mkstemp(info->name_bitmap)) < 0) {
 		ERRMSG("Can't open the bitmap file(%s). %s\n",
 		    info->name_bitmap, strerror(errno));
--- kexec-tools-2.0.0/makedumpfile-1.3.5/makedumpfile.h	2010-07-09 13:45:24.000000000 +0800
+++ kexec-tools-2.0.0/makedumpfile-1.3.5/makedumpfile.h	2010-07-09 13:46:54.000000000 +0800
@@ -230,7 +230,7 @@
 #define BUFSIZE_FGETS		(1500)
 #define BUFSIZE_BITMAP		(4096)
 #define PFN_BUFBITMAP		(BITPERBYTE*BUFSIZE_BITMAP)
-#define FILENAME_BITMAP		"/tmp/kdump_bitmapXXXXXX"
+#define FILENAME_BITMAP		"kdump_bitmapXXXXXX"
 #define FILENAME_STDOUT		"STDOUT"
 
 /*