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The POSIX {{open()}} \[[Open Group 04|AA. C References#Open Group 04]\] is a variadic function with the following prototype: |
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int open(const char *path, int oflag, ... );
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The open() function accepts a third argument to determine a newly created file's access mode. If open() is used to create a new file and the third argument is omitted, the file may be created with unintended access permissions. This omission has been known to lead to vulnerabilities (for instance, CVE-2006-1174).
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