linux-kernel - Re: [PATCH v1] seccomp: simplify secure

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Date:   Tue, 24 Sep 2019 11:51:27 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     keescook@...omium.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-parisc@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-um@...ts.infradead.org,
        luto@...nel.org, oleg@...hat.com, tglx@...utronix.de,
        wad@...omium.org, x86@...nel.org
Subject: Re: [PATCH v1] seccomp: simplify secure_computing()

On Tue, Sep 24, 2019 at 08:44:20AM +0200, Christian Brauner wrote:
> Afaict, the struct seccomp_data argument to secure_computing() is unused
> by all current callers. So let's remove it.
> The argument was added in [1]. It was added because having the arch
> supply the syscall arguments used to be faster than having it done by
> secure_computing() (cf. Andy's comment in [2]). This is not true anymore
> though.
> 
> /* References */
> [1]: 2f275de5d1ed ("seccomp: Add a seccomp_data parameter secure_computing()")
> [2]: https://lore.kernel.org/r/CALCETrU_fs_At-hTpr231kpaAd0z7xJN4ku-DvzhRU6cvcJA_w@mail.gmail.com
> 
> Signed-off-by: Christian Brauner <christian.brauner@...ntu.com>
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Will Drewry <wad@...omium.org>
> Cc: Oleg Nesterov <oleg@...hat.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-parisc@...r.kernel.org
> Cc: linux-s390@...r.kernel.org
> Cc: linux-um@...ts.infradead.org
> Cc: x86@...nel.org
> ---
> /* v1 */
> - Borislav Petkov <bp@...en8.de>:
>   - provide context for the arg addition to secure_computing() in the
>     commit message
> 
> /* v0 */
> Link: https://lore.kernel.org/r/20190920131907.6886-1-christian.brauner@ubuntu.com
> ---
>  arch/arm/kernel/ptrace.c              | 2 +-
>  arch/arm64/kernel/ptrace.c            | 2 +-
>  arch/parisc/kernel/ptrace.c           | 2 +-
>  arch/s390/kernel/ptrace.c             | 4 ++--
>  arch/um/kernel/skas/syscall.c         | 2 +-
>  arch/x86/entry/vsyscall/vsyscall_64.c | 2 +-
>  include/linux/seccomp.h               | 6 +++---
>  7 files changed, 10 insertions(+), 10 deletions(-)

Acked-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette