Re: [PATCH] fs: Evaluate O_WRONLY | O_RDWR to O_RDWR

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On Thu, Dec 13, 2018 at 05:57:17AM -0600, Goldwyn Rodrigues wrote:
> A user can open(O_WRONLY | O_RDWR) and the options are valid.
> However, OPEN_FMODE() evaluates both FMODE_READ and FMODE_WRITE,
> as negative. We also need to protect the lower layers from this
> anomaly.
> 
> Solve it by dropping O_WRONLY, so O_RDWR takes precedence.

Congratulations, you've broken fdutils...  Passing 3 in lower bits
of open() flags is *not* the same as O_RDWR; behaiviour is
different and deliberately chosen by existing userland code.

IOW, NAK.



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