linux-kernel - Re: [PATCH 4/4] Return -EINVAL if userspace passes bogus flags to open()

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Date:   Tue, 12 Feb 2019 20:38:09 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     demiobenour@...il.com
Cc:     "open list:FILESYSTEMS (VFS and infrastructure)" 
        <linux-fsdevel@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] Return -EINVAL if userspace passes bogus flags to
 open()

On Tue, Feb 12, 2019 at 09:54:47AM -0500, demiobenour@...il.com wrote:
> From: "Demi M. Obenour" <demiobenour@...il.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.