linux-kernel - Re: [PATCH v17 07/15] asm/syscall.h: add syscall_get

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]

Message-Id: <20120406130544.3d317192.akpm@linux-foundation.org>
Date:	Fri, 6 Apr 2012 13:05:44 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Will Drewry <wad@...omium.org>
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-doc@...r.kernel.org, kernel-hardening@...ts.openwall.com,
	netdev@...r.kernel.org, x86@...nel.org, arnd@...db.de,
	davem@...emloft.net, hpa@...or.com, mingo@...hat.com,
	oleg@...hat.com, peterz@...radead.org, rdunlap@...otime.net,
	mcgrathr@...omium.org, tglx@...utronix.de, luto@....edu,
	eparis@...hat.com, serge.hallyn@...onical.com, djm@...drot.org,
	scarybeasts@...il.com, indan@....nu, pmoore@...hat.com,
	corbet@....net, eric.dumazet@...il.com, markus@...omium.org,
	coreyb@...ux.vnet.ibm.com, keescook@...omium.org, jmorris@...ei.org
Subject: Re: [PATCH v17 07/15] asm/syscall.h: add syscall_get_arch

On Thu, 29 Mar 2012 15:01:52 -0500
Will Drewry <wad@...omium.org> wrote:

> Adds a stub for a function that will return the AUDIT_ARCH_*
> value appropriate to the supplied task based on the system
> call convention.
> 
> For audit's use, the value can generally be hard-coded at the
> audit-site.  However, for other functionality not inlined into
> syscall entry/exit, this makes that information available.
> seccomp_filter is the first planned consumer and, as such,
> the comment indicates a tie to HAVE_ARCH_SECCOMP_FILTER.  That

Should be "CONFIG_HAVE_ARCH_SECCOMP_FILTER", I hope.

> is probably an unneeded detail.
> 
> ...
>
> --- a/include/asm-generic/syscall.h
> +++ b/include/asm-generic/syscall.h
> @@ -142,4 +142,18 @@ void syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
>  			   unsigned int i, unsigned int n,
>  			   const unsigned long *args);
>  
> +/**
> + * syscall_get_arch - return the AUDIT_ARCH for the current system call
> + * @task:	task of interest, must be in system call entry tracing
> + * @regs:	task_pt_regs() of @task
> + *
> + * Returns the AUDIT_ARCH_* based on the system call convention in use.
> + *
> + * It's only valid to call this when @task is stopped on entry to a system
> + * call, due to %TIF_SYSCALL_TRACE, %TIF_SYSCALL_AUDIT, or %TIF_SECCOMP.
> + *
> + * Note, at present this function is only required with
> + * CONFIG_HAVE_ARCH_SECCOMP_FILTER.
> + */
> +int syscall_get_arch(struct task_struct *task, struct pt_regs *regs);
>  #endif	/* _ASM_SYSCALL_H */

So architectures which permit CONFIG_HAVE_ARCH_SECCOMP_FILTER must
provide an implementation of this.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/