1999-04-08 Owen Taylor <otaylor@redhat.com>

* extfs/deb.in extfs/ulha.in extfs/ucpio.in: Fix
	up sections marked "TMP RACE" comments so they are
	at least secure.

vfs/ChangeLog

@@ -1,3 +1,9 @@
+1999-04-08  Owen Taylor  <otaylor@redhat.com>
+
+	* extfs/deb.in extfs/ulha.in extfs/ucpio.in: Fix
+	up "TMP RACE" comments so they are at least secure,
+	if not terribly robust.
+
 1999-03-31 Serge Winitzki <swinitzk@hotmail.com>
 
         * added copy_in capability to mtools filesystem

vfs/extfs/deb.in

@@ -146,12 +146,21 @@ sub mcdebfs_run
 	}
 	else
 	{
-# FIXME: TMP RACE
-		$tmpcmd="/tmp/mcdebfs.run.$$";
+	        $suffix = "aaa";
+		while (1) {
+		    $tmpdir = /tmp/mcdebfs.run.$$.$suffix;
+		    last if mkdir $tmpdir, 0700;
+		    $suffix++;
+		    # Somebody is being really nasty, give up
+		    exit 1 if $suffix eq "zzz";
+		}
+		
+		$tmpcmd="$tmpdir/run";
 		&mcdebfs_copyout($archive, $filename, $tmpcmd);
 		system("chmod u+x $tmpcmd");
 		system($tmpcmd);
 		unlink($tmpcmd);
+		rmdir($tmpdir);
 	}
 }
 

vfs/extfs/ucpio.in

@@ -48,8 +48,8 @@ mccpiofs_copyout ()
 # $3 is a name of a file within the system (to add from or extract to)
 {
     TMPDIR=/tmp/mctmpdir.$$
-# FIXME: TMP RACE: when mkdir fails, we go there, anyway
-    mkdir $TMPDIR
+# FIXME: Try harder to generate a unique directory if this fails
+    mkdir -m 0700 $TMPDIR || exit 1
     cd $TMPDIR
     uni_cat "$1" | cpio -icumd "$2" 2>/dev/null
     mv "$2" "$3"

vfs/extfs/ulha.in

@@ -46,8 +46,11 @@ LHA_LIST="lha l"
 LHA_GET="lha pq"
 LHA_PUT="lha aq"
 
-# Define the temporary name of a command to be run from the archive
-TMPCMD=/tmp/mc-cmd.$$
+# Define a directory to create a temporary file for when
+# running a command to be run from the archive
+TMPDIR=/tmp/mc-cmd.$$
+# Temporary file within the directory
+TMPCMD=$TMPDIR/run
 
 # The 'list' command executive
 
@@ -137,12 +140,14 @@ mc_lha_fs_copyin ()
 
 mc_lha_fs_run()
 {
-# FIXME: TMP RACE
-   trap "rm $TMPCMD; exit 0" 1 2 3 4 15
+   trap "rm $TMPCMD; rmdir $TMPDIR; exit 0" 1 2 3 4 15
+# FIXME: Try harder to generate a unique directory if this fails
+   mkdir -m 0700 $TMPDIR || exit 1
    $LHA_GET $1 $2 > $TMPCMD  2> /dev/null
    chmod a+x $TMPCMD  2> /dev/null
    $TMPCMD 2> /dev/null
    rm $TMPCMD
+   rmdir $TMPDIR
 }