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

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Date:   Tue, 24 Nov 2020 13:45:42 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     Jann Horn <jannh@...gle.com>, Arnd Bergmann <arnd@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        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 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.
> 
> 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>

-- 
Kees Cook