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unlink() an existing file, before opening it, simply truncating can

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cause nasty problems if overwriting glibc, spotted by waldi.
This commit is contained in:
Glenn L McGrath 2003-04-21 10:07:48 +00:00
parent 6f9a0d4bbb
commit 35a5b08eee
1 changed files with 2 additions and 1 deletions
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archival/tar.c
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@ -472,7 +472,8 @@ static inline int writeTarFile(const char *tarName, const int verboseFlag,
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;
}