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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8E247C433F5 for ; Tue, 11 Oct 2022 14:54:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230294AbiJKOye (ORCPT ); Tue, 11 Oct 2022 10:54:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36182 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230295AbiJKOxd (ORCPT ); Tue, 11 Oct 2022 10:53:33 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4603A9B864; Tue, 11 Oct 2022 07:51:27 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id DB8F9B8136F; Tue, 11 Oct 2022 14:51:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 52DA4C433C1; Tue, 11 Oct 2022 14:51:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1665499883; bh=eHV1aJFxZYib1ONBCUtCKxxKWY0nN7MLKb5IBx+tpRE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=a7PYAg8mhIgS3ZouBr18HjyBXybnn8WKg8Ovioa1VT3l+zcToOb4XSyKCIWOD0WyY UI5z6tpqfyomXLqyCMY2RW0b8MQhpfirkY5jFLv8hyFbDI6rTNEn8RoPic2vIww1pM bFACit/P0dAFsdzQDB05srsGP4kcWgVtdxgpGRkbjHiI/LiHC+Ad6PBTwp9b2evqrS 3fRQykQj7wh70yuaorGZuXy0seT1hfo5FFAy2XgnvTnaM5v2DUo3jYJJiEJcQ1AXED wb8M0TxECU+/pvz4rQnRJ4W5d+lPoMyVw2U5uYqtFByj+YQOUC2nfflJ8G1MECy2zs zwvjlfsSSPqKA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Li Huafei , Linus Waleij , Russell King , Sasha Levin , linux@armlinux.org.uk, rostedt@goodmis.org, ndesaulniers@google.com, mhiramat@kernel.org, linyujun809@huawei.com, linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 6.0 43/46] ARM: 9233/1: stacktrace: Skip frame pointer boundary check for call_with_stack() Date: Tue, 11 Oct 2022 10:50:11 -0400 Message-Id: <20221011145015.1622882-43-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20221011145015.1622882-1-sashal@kernel.org> References: <20221011145015.1622882-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Li Huafei [ Upstream commit 5854e4d8530e6ed4c2532a71a6b0474e199d44dd ] When using the frame pointer unwinder, it was found that the stack trace output of stack_trace_save() is incomplete if the stack contains call_with_stack(): [0x7f00002c] dump_stack_task+0x2c/0x90 [hrtimer] [0x7f0000a0] hrtimer_hander+0x10/0x18 [hrtimer] [0x801a67f0] __hrtimer_run_queues+0x1b0/0x3b4 [0x801a7350] hrtimer_run_queues+0xc4/0xd8 [0x801a597c] update_process_times+0x3c/0x88 [0x801b5a98] tick_periodic+0x50/0xd8 [0x801b5bf4] tick_handle_periodic+0x24/0x84 [0x8010ffc4] twd_handler+0x38/0x48 [0x8017d220] handle_percpu_devid_irq+0xa8/0x244 [0x80176e9c] generic_handle_domain_irq+0x2c/0x3c [0x8052e3a8] gic_handle_irq+0x7c/0x90 [0x808ab15c] generic_handle_arch_irq+0x60/0x80 [0x8051191c] call_with_stack+0x1c/0x20 For the frame pointer unwinder, unwind_frame() checks stackframe::fp by stackframe::sp. Since call_with_stack() switches the SP from one stack to another, stackframe::fp and stackframe: :sp will point to different stacks, so we can no longer check stackframe::fp by stackframe::sp. Skip checking stackframe::fp at this point to avoid this problem. Signed-off-by: Li Huafei Reviewed-by: Linus Waleij Signed-off-by: Russell King (Oracle) Signed-off-by: Sasha Levin --- arch/arm/kernel/stacktrace.c | 40 ++++++++++++++++++++++++++++------ arch/arm/lib/call_with_stack.S | 2 ++ 2 files changed, 35 insertions(+), 7 deletions(-) diff --git a/arch/arm/kernel/stacktrace.c b/arch/arm/kernel/stacktrace.c index d0fa2037460a..af87040b0353 100644 --- a/arch/arm/kernel/stacktrace.c +++ b/arch/arm/kernel/stacktrace.c @@ -9,6 +9,8 @@ #include #include +#include "reboot.h" + #if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND) /* * Unwind the current stack frame and store the new register values in the @@ -39,29 +41,53 @@ * Note that with framepointer enabled, even the leaf functions have the same * prologue and epilogue, therefore we can ignore the LR value in this case. */ -int notrace unwind_frame(struct stackframe *frame) + +extern unsigned long call_with_stack_end; + +static int frame_pointer_check(struct stackframe *frame) { unsigned long high, low; unsigned long fp = frame->fp; + unsigned long pc = frame->pc; + + /* + * call_with_stack() is the only place we allow SP to jump from one + * stack to another, with FP and SP pointing to different stacks, + * skipping the FP boundary check at this point. + */ + if (pc >= (unsigned long)&call_with_stack && + pc < (unsigned long)&call_with_stack_end) + return 0; /* only go to a higher address on the stack */ low = frame->sp; high = ALIGN(low, THREAD_SIZE); -#ifdef CONFIG_CC_IS_CLANG /* check current frame pointer is within bounds */ +#ifdef CONFIG_CC_IS_CLANG if (fp < low + 4 || fp > high - 4) return -EINVAL; - - frame->sp = frame->fp; - frame->fp = READ_ONCE_NOCHECK(*(unsigned long *)(fp)); - frame->pc = READ_ONCE_NOCHECK(*(unsigned long *)(fp + 4)); #else - /* check current frame pointer is within bounds */ if (fp < low + 12 || fp > high - 4) return -EINVAL; +#endif + + return 0; +} + +int notrace unwind_frame(struct stackframe *frame) +{ + unsigned long fp = frame->fp; + + if (frame_pointer_check(frame)) + return -EINVAL; /* restore the registers from the stack frame */ +#ifdef CONFIG_CC_IS_CLANG + frame->sp = frame->fp; + frame->fp = READ_ONCE_NOCHECK(*(unsigned long *)(fp)); + frame->pc = READ_ONCE_NOCHECK(*(unsigned long *)(fp + 4)); +#else frame->fp = READ_ONCE_NOCHECK(*(unsigned long *)(fp - 12)); frame->sp = READ_ONCE_NOCHECK(*(unsigned long *)(fp - 8)); frame->pc = READ_ONCE_NOCHECK(*(unsigned long *)(fp - 4)); diff --git a/arch/arm/lib/call_with_stack.S b/arch/arm/lib/call_with_stack.S index 0a268a6c513c..5030d4e8d126 100644 --- a/arch/arm/lib/call_with_stack.S +++ b/arch/arm/lib/call_with_stack.S @@ -46,4 +46,6 @@ UNWIND( .setfp fpreg, sp ) pop {fpreg, pc} UNWIND( .fnend ) #endif + .globl call_with_stack_end +call_with_stack_end: ENDPROC(call_with_stack) -- 2.35.1