linux-kernel - Re: [PATCH 1/6 v3] ptrace: Remove maxargs from task_current

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 4 Apr 2019 09:52:11 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
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>,
        "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>,
        "Dmitry V. Levin" <ldv@...linux.org>,
        Palmer Dabbelt <palmer@...ive.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/6 v3] ptrace: Remove maxargs from
 task_current_syscall()

On Mon, 1 Apr 2019, Steven Rostedt wrote:

> From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> 
> task_current_syscall() has a single user that passes in 6 for maxargs, which
> is the maximum arguments that can be used to get system calls from
> syscall_get_arguments(). Instead of passing in a number of arguments to
> grab, just get 6 arguments. The args argument even specifies that it's an
> array of 6 items.
> 
> This will also allow changing syscall_get_arguments() to not get a variable
> number of arguments, but always grab 6.
> 
> Linus also suggested not passing in a bunch of arguments to
> task_current_syscall() but to instead pass in a pointer to a structure, and
> just fill the structure. struct seccomp_data has almost all the parameters
> that is needed except for the stack pointer (sp). As seccomp_data is part of
> uapi, and I'm afraid to change it, a new structure was created
> "syscall_info", which includes seccomp_data and adds the "sp" field.
> 
> Link: http://lkml.kernel.org/r/20161107213233.466776454@goodmis.org
> 
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: Alexey Dobriyan <adobriyan@...il.com>
> Cc: Oleg Nesterov <oleg@...hat.com>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Al Viro <viro@...iv.linux.org.uk>
> Cc: linux-fsdevel@...r.kernel.org
> Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>