linux-kernel - Re: [GIT PULL] objtool/urgent for v6.5-rc2

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Message-ID: <CAHk-=wiXp9YLB6wHOmc4rBJbd7j0gHgHZPHhUSPe-SAjJgmABQ@mail.gmail.com>
Date:   Sun, 16 Jul 2023 13:39:56 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     x86-ml <x86@...nel.org>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] objtool/urgent for v6.5-rc2

On Sun, 16 Jul 2023 at 11:42, Borislav Petkov <bp@...en8.de> wrote:
>
> - Mark copy_iovec_from_user() __noclone in order to  prevent gcc from
>   doing an inter-procedural optimization and confuse objtool

This is painful.

Isn't there some way to mark the user_access_begin() itself so that
the compiler doesn't move it?

I've pulled this thing, but it does seem like we're chasing the
symptoms, not the deeper cause..

            Linus