unlink() an existing file, before opening it, simply truncating can
cause nasty problems if overwriting glibc, spotted by waldi.
diff --git a/archival/tar.c b/archival/tar.c
index c39d578..23af9ff 100644
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -472,7 +472,8 @@
tbInfo.tarFd = fileno(stdout);
tbInfo.verboseFlag = verboseFlag ? 2 : 0;
} else {
- tbInfo.tarFd = open(tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+ unlink(tarName);
+ tbInfo.tarFd = open(tarName, O_WRONLY | O_CREAT | O_EXCL, 0644);
tbInfo.verboseFlag = verboseFlag ? 1 : 0;
}