From patchwork Mon Apr 5 20:43:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Madhavan T. Venkataraman" X-Patchwork-Id: 12183593 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=-16.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 9D057C433ED for ; Mon, 5 Apr 2021 20:45:22 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 3E0F2613C6 for ; Mon, 5 Apr 2021 20:45:22 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3E0F2613C6 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+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=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Cc:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=eqstGhICW5f5ZfvmFpfgx9HXHXvriYSelS0U0d8NKFA=; b=D0vBRZ7ovLhy7zxyAwY7w/SKb QsAgvGlYXgC/y4koBReJjIJpbyZOgo6z35kM5W73AbVSa/taMJLkMhdGRvTKjm8IooL7QclrxyO7k 7XC1SYR5vn+rz789xRuQGZ7jT1Gn5MUKQXHyauHGbcJX+94catKQk0L9m9gxfZSWMSCAOrQsYyZKR XUNBGCQOdXOof5zIncuJpoDFyzCZz0jzl+aHFcnmcOlpeg9eHGi78Y7Bub8anb0igVTeDdELClLsh uj0UHSuN5k5mEU/CKWAqbN3cr2BUgRBOsHA4bJc/d3PpQ7mFjM5N2jXFkOG/TwsCEAqd1uFrTTOgh o9dgrSY5Q==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lTW4g-000dbp-Sq; Mon, 05 Apr 2021 20:43:55 +0000 Received: from linux.microsoft.com ([13.77.154.182]) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lTW4F-000dYS-8v for linux-arm-kernel@lists.infradead.org; Mon, 05 Apr 2021 20:43:30 +0000 Received: from x64host.home (unknown [47.187.194.202]) by linux.microsoft.com (Postfix) with ESMTPSA id B91F620B5683; Mon, 5 Apr 2021 13:43:25 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com B91F620B5683 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1617655406; bh=syB2zPgGDplCermE8pzh/3xNAVmQD2QmALo8binCuMg=; h=From:To:Subject:Date:In-Reply-To:References:From; b=X3UivgY8YLad4RgjUyS4RJ8kx+eDKQmoa9UmEOulhHZvy5TFKwMAkCB4WV9cikMW7 +MqOMeWw0xV9903+IGW5qBwvRID5FSkWXMEW+h598M4YDkjMC8CxUL8VQ2zlm0wC26 omNEA/ABHrZPlTIAAfUJdof2csUUJmleD3cxLTvA= From: madvenka@linux.microsoft.com To: mark.rutland@arm.com, broonie@kernel.org, jpoimboe@redhat.com, jthierry@redhat.com, catalin.marinas@arm.com, will@kernel.org, linux-arm-kernel@lists.infradead.org, live-patching@vger.kernel.org, linux-kernel@vger.kernel.org, madvenka@linux.microsoft.com Subject: [RFC PATCH v2 3/4] arm64: Detect FTRACE cases that make the stack trace unreliable Date: Mon, 5 Apr 2021 15:43:12 -0500 Message-Id: <20210405204313.21346-4-madvenka@linux.microsoft.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210405204313.21346-1-madvenka@linux.microsoft.com> References: <705993ccb34a611c75cdae0a8cb1b40f9b218ebd> <20210405204313.21346-1-madvenka@linux.microsoft.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210405_214328_479342_20D051CF X-CRM114-Status: GOOD ( 25.75 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: "Madhavan T. Venkataraman" When CONFIG_DYNAMIC_FTRACE_WITH_REGS is enabled and tracing is activated for a function, the ftrace infrastructure is called for the function at the very beginning. Ftrace creates two frames: - One for the traced function - One for the caller of the traced function That gives a reliable stack trace while executing in the ftrace code. When ftrace returns to the traced function, the frames are popped and everything is back to normal. However, in cases like live patch, a tracer function may redirect execution to a different function when it returns. A stack trace taken while still in the tracer function will not show the target function. The target function is the real function that we want to track. So, if an FTRACE frame is detected on the stack, just mark the stack trace as unreliable. The detection is done by checking the return PC against FTRACE trampolines. Also, the Function Graph Tracer modifies the return address of a traced function to a return trampoline to gather tracing data on function return. Stack traces taken from that trampoline and functions it calls are unreliable as the original return address may not be available in that context. Mark the stack trace unreliable accordingly. Signed-off-by: Madhavan T. Venkataraman --- arch/arm64/kernel/entry-ftrace.S | 12 +++++++ arch/arm64/kernel/stacktrace.c | 61 ++++++++++++++++++++++++++++++++ 2 files changed, 73 insertions(+) diff --git a/arch/arm64/kernel/entry-ftrace.S b/arch/arm64/kernel/entry-ftrace.S index b3e4f9a088b1..1f0714a50c71 100644 --- a/arch/arm64/kernel/entry-ftrace.S +++ b/arch/arm64/kernel/entry-ftrace.S @@ -86,6 +86,18 @@ SYM_CODE_START(ftrace_caller) b ftrace_common SYM_CODE_END(ftrace_caller) +/* + * A stack trace taken from anywhere in the FTRACE trampoline code should be + * considered unreliable as a tracer function (patched at ftrace_call) could + * potentially set pt_regs->pc and redirect execution to a function different + * than the traced function. E.g., livepatch. + * + * No stack traces are taken in this FTRACE trampoline assembly code. But + * they can be taken from C functions that get called from here. The unwinder + * checks if a return address falls in this FTRACE trampoline code. See + * stacktrace.c. If function calls in this code are changed, please keep the + * special_functions[] array in stacktrace.c in sync. + */ SYM_CODE_START(ftrace_common) sub x0, x30, #AARCH64_INSN_SIZE // ip (callsite's BL insn) mov x1, x9 // parent_ip (callsite's LR) diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c index fb11e4372891..7a3c638d4aeb 100644 --- a/arch/arm64/kernel/stacktrace.c +++ b/arch/arm64/kernel/stacktrace.c @@ -51,6 +51,52 @@ struct function_range { * unreliable. Breakpoints are used for executing probe code. Stack traces * taken while in the probe code will show an EL1 frame and will be considered * unreliable. This is correct behavior. + * + * FTRACE + * ====== + * + * When CONFIG_DYNAMIC_FTRACE_WITH_REGS is enabled, the FTRACE trampoline code + * is called from a traced function even before the frame pointer prolog. + * FTRACE sets up two stack frames (one for the traced function and one for + * its caller) so that the unwinder can provide a sensible stack trace for + * any tracer function called from the FTRACE trampoline code. + * + * There are two cases where the stack trace is not reliable. + * + * (1) The task gets preempted before the two frames are set up. Preemption + * involves an interrupt which is an EL1 exception. The unwinder already + * handles EL1 exceptions. + * + * (2) The tracer function that gets called by the FTRACE trampoline code + * changes the return PC (e.g., livepatch). + * + * Not all tracer functions do that. But to err on the side of safety, + * consider the stack trace as unreliable in all cases. + * + * When Function Graph Tracer is used, FTRACE modifies the return address of + * the traced function in its stack frame to an FTRACE return trampoline + * (return_to_handler). When the traced function returns, control goes to + * return_to_handler. return_to_handler calls FTRACE to gather tracing data + * and to obtain the original return address. Then, return_to_handler returns + * to the original return address. + * + * There are two cases to consider from a stack trace reliability point of + * view: + * + * (1) Stack traces taken within the traced function (and functions that get + * called from there) will show return_to_handler instead of the original + * return address. The original return address can be obtained from FTRACE. + * The unwinder already obtains it and modifies the return PC in its copy + * of the stack frame to the original return address. So, this is handled. + * + * (2) return_to_handler calls FTRACE as mentioned before. FTRACE discards + * the record of the original return address along the way as it does not + * need to maintain it anymore. This means that the unwinder cannot get + * the original return address beyond that point while the task is still + * executing in return_to_handler. So, consider the stack trace unreliable + * if return_to_handler is detected on the stack. + * + * NOTE: The unwinder must do (1) before (2). */ static struct function_range special_functions[] = { /* @@ -64,6 +110,21 @@ static struct function_range special_functions[] = { { (unsigned long) el1_fiq_invalid, 0 }, { (unsigned long) el1_error_invalid, 0 }, + /* + * FTRACE trampolines. + * + * Tracer function gets patched at the label ftrace_call. Its return + * address is the next instruction address. + */ +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS + { (unsigned long) ftrace_call + 4, 0 }, +#endif + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER + { (unsigned long) ftrace_graph_caller, 0 }, + { (unsigned long) return_to_handler, 0 }, +#endif + { /* sentinel */ } };