From patchwork Thu Aug 21 08:56:45 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AKASHI Takahiro X-Patchwork-Id: 4756161 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id CBFD7C0338 for ; Thu, 21 Aug 2014 09:00:41 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 7959A20103 for ; Thu, 21 Aug 2014 09:00:40 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 299D6200FE for ; Thu, 21 Aug 2014 09:00:39 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XKOD0-0007py-3J; Thu, 21 Aug 2014 08:59:02 +0000 Received: from mail-pa0-f51.google.com ([209.85.220.51]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XKOCe-0007EV-MU for linux-arm-kernel@lists.infradead.org; Thu, 21 Aug 2014 08:58:41 +0000 Received: by mail-pa0-f51.google.com with SMTP id ey11so13717080pad.24 for ; Thu, 21 Aug 2014 01:58:19 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=aOmsrAZMHo2jbqW09hDamqrArDLGcMVFSh+0q6DnqUo=; b=cDzKe9UeRMO49CN+XzcHfYIHxSlMoxMeakZr/stYujefCzxkl++A2Nz4dsb+74xZDX p4Xq/SO2y4RTCg914qcLSAVKvCMO4ck+lXbqer1JukSVPNk1YevXfitAgHJR/je12Jiu phc+2B8hC2nZywHEE3QSzXbIfQ/dEmilXR9DsdOzYAfn3zuCZjiSAXe1hudpWPAYk44u t6D13xKP8xGjO8aPvwl7wbyVys0bShgN3PViRldaURjk5xenM9GoA+4S+FOZmXf8TL2Y emlkqOervwShtI6H9txyMBaLfLF2FOyNjfev43RxOym9D8QJNiwwsZvKNncbWb+aU6j9 i10A== X-Gm-Message-State: ALoCoQk2bRkFg7IDEKXk0c13uvJAqV/RTw5tUvP/R3VE+ZOGPslpvHTT5ftuzJfoRm0cLprb4BvH X-Received: by 10.70.137.37 with SMTP id qf5mr66586616pdb.56.1408611499585; Thu, 21 Aug 2014 01:58:19 -0700 (PDT) Received: from localhost.localdomain (KD182249099030.au-net.ne.jp. [182.249.99.30]) by mx.google.com with ESMTPSA id q5sm37734708pdf.70.2014.08.21.01.58.15 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 21 Aug 2014 01:58:18 -0700 (PDT) From: AKASHI Takahiro To: keescook@chromium.org, catalin.marinas@arm.com, will.deacon@arm.com Subject: [PATCH v6 6/6] arm64: add seccomp support Date: Thu, 21 Aug 2014 17:56:45 +0900 Message-Id: <1408611405-8943-7-git-send-email-takahiro.akashi@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1408611405-8943-1-git-send-email-takahiro.akashi@linaro.org> References: <1408611405-8943-1-git-send-email-takahiro.akashi@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140821_015840_796700_A2C38DFC X-CRM114-Status: GOOD ( 17.72 ) X-Spam-Score: -1.4 (-) Cc: linaro-kernel@lists.linaro.org, arndb@arndb.de, linux-kernel@vger.kernel.org, AKASHI Takahiro , dsaxena@linaro.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP secure_computing() is called first in syscall_trace_enter() so that a system call will be aborted quickly without doing succeeding syscall tracing, contrary to other cases, if seccomp rules deny that system call. On compat task, syscall numbers for system calls allowed in seccomp mode 1 are different from those on normal tasks, and so _NR_seccomp_xxx_32's need to be redefined. Signed-off-by: AKASHI Takahiro --- arch/arm64/Kconfig | 14 ++++++++++++++ arch/arm64/include/asm/ptrace.h | 1 + arch/arm64/include/asm/seccomp.h | 25 +++++++++++++++++++++++++ arch/arm64/include/asm/unistd.h | 3 +++ arch/arm64/kernel/entry.S | 2 ++ arch/arm64/kernel/ptrace.c | 5 +++++ 6 files changed, 50 insertions(+) create mode 100644 arch/arm64/include/asm/seccomp.h diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index fd4e81a..d6dc436 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -34,6 +34,7 @@ config ARM64 select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_JUMP_LABEL select HAVE_ARCH_KGDB + select HAVE_ARCH_SECCOMP_FILTER select HAVE_ARCH_TRACEHOOK select HAVE_C_RECORDMCOUNT select HAVE_CC_STACKPROTECTOR @@ -312,6 +313,19 @@ config ARCH_HAS_CACHE_LINE_SIZE source "mm/Kconfig" +config SECCOMP + bool "Enable seccomp to safely compute untrusted bytecode" + ---help--- + This kernel feature is useful for number crunching applications + that may need to compute untrusted bytecode during their + execution. By using pipes or other transports made available to + the process as file descriptors supporting the read/write + syscalls, it's possible to isolate those applications in + their own address space using seccomp. Once seccomp is + enabled via prctl(PR_SET_SECCOMP), it cannot be disabled + and the task is only allowed to execute a few safe syscalls + defined by each seccomp mode. + config XEN_DOM0 def_bool y depends on XEN diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h index a58cf62..a844d06 100644 --- a/arch/arm64/include/asm/ptrace.h +++ b/arch/arm64/include/asm/ptrace.h @@ -71,6 +71,7 @@ * with ptrace(PTRACE_SET_SYSCALL) */ #define RET_SKIP_SYSCALL -1 +#define RET_SKIP_SYSCALL_TRACE -2 #define IS_SKIP_SYSCALL(no) ((int)(no & 0xffffffff) == -1) #ifndef __ASSEMBLY__ diff --git a/arch/arm64/include/asm/seccomp.h b/arch/arm64/include/asm/seccomp.h new file mode 100644 index 0000000..c76fac9 --- /dev/null +++ b/arch/arm64/include/asm/seccomp.h @@ -0,0 +1,25 @@ +/* + * arch/arm64/include/asm/seccomp.h + * + * Copyright (C) 2014 Linaro Limited + * Author: AKASHI Takahiro + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#ifndef _ASM_SECCOMP_H +#define _ASM_SECCOMP_H + +#include + +#ifdef CONFIG_COMPAT +#define __NR_seccomp_read_32 __NR_compat_read +#define __NR_seccomp_write_32 __NR_compat_write +#define __NR_seccomp_exit_32 __NR_compat_exit +#define __NR_seccomp_sigreturn_32 __NR_compat_rt_sigreturn +#endif /* CONFIG_COMPAT */ + +#include + +#endif /* _ASM_SECCOMP_H */ diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h index cf6ee31..7c73059 100644 --- a/arch/arm64/include/asm/unistd.h +++ b/arch/arm64/include/asm/unistd.h @@ -31,6 +31,9 @@ * Compat syscall numbers used by the AArch64 kernel. */ #define __NR_compat_restart_syscall 0 +#define __NR_compat_exit 1 +#define __NR_compat_read 3 +#define __NR_compat_write 4 #define __NR_compat_sigreturn 119 #define __NR_compat_rt_sigreturn 173 diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index fdd6eae..d5eb447 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -672,6 +672,8 @@ ENDPROC(el0_svc) __sys_trace: mov x0, sp bl syscall_trace_enter + cmp w0, #RET_SKIP_SYSCALL_TRACE // skip syscall and tracing? + b.eq ret_to_user cmp w0, #RET_SKIP_SYSCALL // skip syscall? b.eq __sys_trace_return_skipped adr lr, __sys_trace_return // return address diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index c54dbcc..4287d68 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include #include @@ -1123,6 +1124,10 @@ asmlinkage int syscall_trace_enter(struct pt_regs *regs) { unsigned int saved_syscallno = regs->syscallno; + /* Do the secure computing check first; failures should be fast. */ + if (secure_computing(regs->syscallno) == -1) + return RET_SKIP_SYSCALL_TRACE; + if (test_thread_flag(TIF_SYSCALL_TRACE)) tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);