linux-kernel - Re: [PATCH 4/6 v3] csky: Fix syscall_get_arguments() and syscall_set

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Date:   Thu, 4 Apr 2019 17:02:01 +0300
From:   "Dmitry V. Levin" <ldv@...linux.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Roland McGrath <roland@...k.frob.com>,
        Oleg Nesterov <oleg@...hat.com>, linux-arch@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Andy Lutomirski <luto@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Will Drewry <wad@...omium.org>, Guo Ren <guoren@...nel.org>
Subject: Re: [PATCH 4/6 v3] csky: Fix syscall_get_arguments() and
 syscall_set_arguments()

On Mon, Apr 01, 2019 at 09:41:08AM -0400, Steven Rostedt wrote:
> From: "Dmitry V. Levin" <ldv@...linux.org>
> 
> C-SKY syscall arguments are located in orig_a0,a1,a2,a3,regs[0],regs[1]
> fields of struct pt_regs.
> 
> Due to an off-by-one bug and a bug in pointer arithmetic
> syscall_get_arguments() was reading orig_a0,regs[1..5] fields instead.
> Likewise, syscall_set_arguments() was writing orig_a0,regs[1..5] fields
> instead.
> 
> Link: http://lkml.kernel.org/r/20190329171230.GB32456@altlinux.org
> 
> Fixes: 4859bfca11c7d ("csky: System Call")
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Andy Lutomirski <luto@...capital.net>
> Cc: Will Drewry <wad@...omium.org>
> Cc: Guo Ren <guoren@...nel.org>
> Cc: stable@...r.kernel.org # v4.20+
> Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
> Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

According to
https://lore.kernel.org/lkml/20190330004949.GA15705@guoren-Inspiron-7460/
the following tags could be added to this patch:

Tested-by: Guo Ren <ren_guo@...ky.com>
Acked-by: Guo Ren <ren_guo@...ky.com>


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