splice vs O_APPEND

[Miklos Szeredi]

While looking at the f_pos corruption thing, I found that splice() to
a regular file totally ignores O_APPEND.  Which allows users to bypass
the append-only restriction.  Bad...

The only question is how this should be solved?  Should splice()
respect O_APPEND and ignore the offset?  Or should it just return
-EINVAL?

Thanks,
Miklos
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