Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754209AbaGQSMG (ORCPT ); Thu, 17 Jul 2014 14:12:06 -0400 Received: from smtp.outflux.net ([198.145.64.163]:37438 "EHLO smtp.outflux.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752099AbaGQSJY (ORCPT ); Thu, 17 Jul 2014 14:09:24 -0400 From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , James Morris , Oleg Nesterov , Andy Lutomirski , David Drysdale , "Michael Kerrisk (man-pages)" , Will Drewry , Julien Tinnes , linux-api@vger.kernel.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@linux-mips.org, linux-arch@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH v12 02/11] seccomp: extract check/assign mode helpers Date: Thu, 17 Jul 2014 11:08:29 -0700 Message-Id: <1405620518-18495-3-git-send-email-keescook@chromium.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1405620518-18495-1-git-send-email-keescook@chromium.org> References: <1405620518-18495-1-git-send-email-keescook@chromium.org> X-HELO: www.outflux.net Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org To support splitting mode 1 from mode 2, extract the mode checking and assignment logic into common functions. Signed-off-by: Kees Cook Reviewed-by: Oleg Nesterov Reviewed-by: Andy Lutomirski --- kernel/seccomp.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) diff --git a/kernel/seccomp.c b/kernel/seccomp.c index afb916c7e890..9df7def86c3b 100644 --- a/kernel/seccomp.c +++ b/kernel/seccomp.c @@ -194,7 +194,23 @@ static u32 seccomp_run_filters(int syscall) } return ret; } +#endif /* CONFIG_SECCOMP_FILTER */ +static inline bool seccomp_may_assign_mode(unsigned long seccomp_mode) +{ + if (current->seccomp.mode && current->seccomp.mode != seccomp_mode) + return false; + + return true; +} + +static inline void seccomp_assign_mode(unsigned long seccomp_mode) +{ + current->seccomp.mode = seccomp_mode; + set_tsk_thread_flag(current, TIF_SECCOMP); +} + +#ifdef CONFIG_SECCOMP_FILTER /** * seccomp_attach_filter: Attaches a seccomp filter to current. * @fprog: BPF program to install @@ -490,8 +506,7 @@ static long seccomp_set_mode(unsigned long seccomp_mode, char __user *filter) { long ret = -EINVAL; - if (current->seccomp.mode && - current->seccomp.mode != seccomp_mode) + if (!seccomp_may_assign_mode(seccomp_mode)) goto out; switch (seccomp_mode) { @@ -512,8 +527,7 @@ static long seccomp_set_mode(unsigned long seccomp_mode, char __user *filter) goto out; } - current->seccomp.mode = seccomp_mode; - set_thread_flag(TIF_SECCOMP); + seccomp_assign_mode(seccomp_mode); out: return ret; } -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/