linux-kernel - Re: [PATCH] x86/uaccess: Remove unused __addr

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Date:   Mon, 25 Feb 2019 11:20:42 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Jann Horn <jannh@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        "Tobin C. Harding" <tobin@...nel.org>
Subject: Re: [PATCH] x86/uaccess: Remove unused __addr_ok() macro

On Mon, Feb 25, 2019 at 11:11 AM Borislav Petkov <bp@...en8.de> wrote:
>
> This was caught while staring at the whole {set,get}_fs() machinery.

Heh.

You should probably have researched _when_ it became unused.

That seems to have happened in commit 5723aa993d83 ("x86: use the new
generic strnlen_user() function") which removed the single user from
the x86-32 version of strnlen_user(), which used to have

        unsigned long mask = -__addr_ok(s);

in it.

Way back in 2012.

Ack.

                 Linus