MAP_DENYWRITE option of mmap was a source of denial-of-service attacks?

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The man page of mmap function mentioned MAP_DENYWRITE can cause denial-of-service attacks. But why?

MAP_DENYWRITE This flag is ignored. (Long ago, it signaled that attempts to write to the underlying file should fail with ETXTBUSY. But this was a source of denial-of-service attacks.)

linux-kernel posix
1 Answers

MAP_DENYWRITE will lock the file and prevent other processes from writing it to it. Thus, it forms a basis for a Denial-of-Service (deny other processes from writing to the file).

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