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SubjectRe: [PATCH 4/4] Return -EINVAL if userspace passes bogus flags to open()
On Tue, Feb 12, 2019 at 09:54:47AM -0500, demiobenour@gmail.com wrote:
> From: "Demi M. Obenour" <demiobenour@gmail.com>
>
> While testing the O_PATHSTATIC patch, I discovered that Linux does not
> return any error if an invalid flag is passed to open(2). This prevents
> adding new flags without a (minor) risk of breaking userspace.
> Therefore, add a check for invalid flags, and return -EINVAL if any are
> found.

... which would qualtify as userland ABI breakage all by itself.

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