From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7BC76C43381 for ; Thu, 28 Feb 2019 18:33:00 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 424C5218C3 for ; Thu, 28 Feb 2019 18:33:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="jDaZYbg5" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 424C5218C3 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=BQlRp/ssZ3BkLkQ7KLkvX5FSSZSxAfHG+744X2T9/mw=; b=jDaZYbg5is3GUjW09Y0jh2vPVj yIoXcgXAgr1rgJGmz1ndDMjttitWSb6J8lQZY6ijn2slGgtODsNmtAj7waZEMZzp/cLEfXmTRMcE/ ghmRysn/9tUycDpZf4qimJhMDpaUTD0ArGC1zzBmvCB5U+e0oLc8LKa2w5dsA6KInexdGnK8P30+Y 3+mwXLMgCTbMdsNyxonvivjgGJIgdXGeTiqLsKgT815tD9lQMDA0gjioMdtpXJz0cstKdddpumD3I QNkX5c0luvFPXECKq5dZmXbeALc1v+3HyqGoDDCAs7BRBn0Us6+Wd6m72/PZs7+4EWjqAuuGXx+z4 TiH2zlmw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gzQUK-0001mb-4b; Thu, 28 Feb 2019 18:32:56 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gzQTz-0001Mr-Fc for linux-arm-kernel@lists.infradead.org; Thu, 28 Feb 2019 18:32:39 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id C37C81684; Thu, 28 Feb 2019 10:32:34 -0800 (PST) Received: from usa.arm.com (e107155-lin.cambridge.arm.com [10.1.196.42]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id F38093F5C1; Thu, 28 Feb 2019 10:32:31 -0800 (PST) From: Sudeep Holla To: x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH 2/6] ptrace: introduce ptrace_syscall_enter to consolidate PTRACE_SYSEMU handling Date: Thu, 28 Feb 2019 18:32:16 +0000 Message-Id: <20190228183220.15626-3-sudeep.holla@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190228183220.15626-1-sudeep.holla@arm.com> References: <20190228183220.15626-1-sudeep.holla@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190228_103235_859377_C3EC9AE2 X-CRM114-Status: GOOD ( 12.45 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Haibo Xu , Steve Capper , Michael Ellerman , jdike@addtoit.com, Sudeep Holla , Will Deacon , Oleg Nesterov , Bin Lu , Richard Weinberger , Ingo Molnar , Paul Mackerras , Catalin Marinas , Thomas Gleixner MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Currently each architecture handles PTRACE_SYSEMU in very similar way. It's completely arch independent and can be handled in the code helping to consolidate PTRACE_SYSEMU handling. Let's introduce a hook 'ptrace_syscall_enter' that arch specific syscall entry code can call. Cc: Oleg Nesterov Signed-off-by: Sudeep Holla --- include/linux/ptrace.h | 1 + kernel/ptrace.c | 16 ++++++++++++++++ 2 files changed, 17 insertions(+) diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h index edb9b040c94c..e30f51e3363e 100644 --- a/include/linux/ptrace.h +++ b/include/linux/ptrace.h @@ -407,6 +407,7 @@ static inline void user_single_step_report(struct pt_regs *regs) #define current_user_stack_pointer() user_stack_pointer(current_pt_regs()) #endif +extern long ptrace_syscall_enter(struct pt_regs *regs); extern int task_current_syscall(struct task_struct *target, long *callno, unsigned long args[6], unsigned int maxargs, unsigned long *sp, unsigned long *pc); diff --git a/kernel/ptrace.c b/kernel/ptrace.c index 4fa3b7f4c3c7..6724eaf98e79 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -29,6 +29,7 @@ #include #include #include +#include /* * Access another process' address space via ptrace. @@ -557,6 +558,21 @@ static int ptrace_detach(struct task_struct *child, unsigned int data) return 0; } +/* + * Hook to check and report for PTRACE_SYSEMU, can be called from arch + * arch syscall entry code + */ +long ptrace_syscall_enter(struct pt_regs *regs) +{ +#ifdef TIF_SYSCALL_EMU + if (test_thread_flag(TIF_SYSCALL_EMU)) { + if (tracehook_report_syscall_entry(regs)); + return -1L; + } +#endif + return 0; +} + /* * Detach all tasks we were using ptrace on. Called with tasklist held * for writing. -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel