From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932350Ab2BYDZK (ORCPT ); Fri, 24 Feb 2012 22:25:10 -0500 Received: from mail-gx0-f174.google.com ([209.85.161.174]:55760 "EHLO mail-gx0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932191Ab2BYDWq (ORCPT ); Fri, 24 Feb 2012 22:22:46 -0500 Authentication-Results: mr.google.com; spf=pass (google.com: domain of wad@chromium.org designates 10.236.170.193 as permitted sender) smtp.mail=wad@chromium.org; dkim=pass header.i=wad@chromium.org MIME-Version: 1.0 From: Will Drewry To: linux-kernel@vger.kernel.org Cc: linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, kernel-hardening@lists.openwall.com, netdev@vger.kernel.org, x86@kernel.org, arnd@arndb.de, davem@davemloft.net, hpa@zytor.com, mingo@redhat.com, oleg@redhat.com, peterz@infradead.org, rdunlap@xenotime.net, mcgrathr@chromium.org, tglx@linutronix.de, luto@mit.edu, eparis@redhat.com, serge.hallyn@canonical.com, djm@mindrot.org, scarybeasts@gmail.com, indan@nul.nu, pmoore@redhat.com, akpm@linux-foundation.org, corbet@lwn.net, eric.dumazet@gmail.com, markus@chromium.org, coreyb@linux.vnet.ibm.com, keescook@chromium.org, Will Drewry Subject: [PATCH v11 04/12] asm/syscall.h: add syscall_get_arch Date: Fri, 24 Feb 2012 21:21:43 -0600 Message-Id: <1330140111-17201-4-git-send-email-wad@chromium.org> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <1330140111-17201-1-git-send-email-wad@chromium.org> References: <1330140111-17201-1-git-send-email-wad@chromium.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 is probably an unneeded detail. Suggested-by: Roland McGrath Signed-off-by: Will Drewry v11: fixed improper return type (mcgrathr@chromium.org) v10: introduced --- include/asm-generic/syscall.h | 14 ++++++++++++++ 1 files changed, 14 insertions(+), 0 deletions(-) diff --git a/include/asm-generic/syscall.h b/include/asm-generic/syscall.h index 5c122ae..a2c13dc 100644 --- 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 */ -- 1.7.5.4