linux-kernel - Re: [PATCH] entry: Fix boot for !CONFIG_GENERIC

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Message-ID: <CA+G9fYtRt9LA4L2tf3aw8fmPuDDZNbejnU2XGk=Q93Tx3mXYrA@mail.gmail.com>
Date:   Wed, 25 Nov 2020 09:06:18 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Gabriel Krisman Bertazi <krisman@...labora.com>,
        Jann Horn <jannh@...gle.com>, Arnd Bergmann <arnd@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        open list <linux-kernel@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        lkft-triage@...ts.linaro.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andy Lutomirski <luto@...capital.net>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        YiFei Zhu <yifeifz2@...inois.edu>
Subject: Re: [PATCH] entry: Fix boot for !CONFIG_GENERIC_ENTRY

On Wed, 25 Nov 2020 at 03:15, Kees Cook <keescook@...omium.org> wrote:
>
> On Mon, Nov 23, 2020 at 10:54:58AM -0500, Gabriel Krisman Bertazi wrote:
> > Gabriel Krisman Bertazi <krisman@...labora.com> writes:
> >
> > > Jann Horn <jannh@...gle.com> writes:
> > >> As part of fixing this, it might be a good idea to put "enum
> > >> syscall_work_bit" behind a "#ifdef CONFIG_GENERIC_ENTRY" to avoid
> > >> future accidents like this?
> > >
> > > Hi Jan, Arnd,
> > >
> > > That is correct.  This is a copy pasta mistake.  My apologies.  I didn't
> > > have a !GENERIC_ENTRY device to test, but just the ifdef would have
> > > caught it.
> >
> > I have patched it as suggested.  Tested on qemu for arm32 and on bare
> > metal for x86-64.
> >
> > Once again, my apologies for the mistake.
> >
> > -- >8 --
> > Subject: [PATCH] entry: Fix boot for !CONFIG_GENERIC_ENTRY
> >
> > A copy-pasta mistake tries to set SYSCALL_WORK flags instead of TIF
> > flags for !CONFIG_GENERIC_ENTRY.  Also, add safeguards to catch this at
> > compilation time.

This patch tested on arm64, arm, x86_64 and i386
and the reported issue got fixed.

> >
> > Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> > Suggested-by: Jann Horn <jannh@...gle.com>
> > Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
>
> Thanks for getting this fixed!
>
> 3136b93c3fb2 ("entry: Expose helpers to migrate TIF to SYSCALL_WORK flags")
> Reviewed-by: Kees Cook <keescook@...omium.org>

Tested-by: Naresh Kamboju <naresh.kamboju@...aro.org>

- Naresh