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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DDC20C433F5 for ; Fri, 8 Oct 2021 09:56:02 +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 A04FC61037 for ; Fri, 8 Oct 2021 09:56:02 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org A04FC61037 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:Subject:Message-ID:Date:From: In-Reply-To:References:MIME-Version:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=P/pljsuqES3u/HZ4RIsQcA079Zly4oeJIZpIb2QjbUE=; b=ydCoxBth4K+LpS QeZ5lgSsQ6nXbaI9lcYGLh3sNoZCuPhPWLbWQFjIZ2daGjYwlIgz4eS1ofStbUKDo5FbT74HYApMY TQTCnJ2HJhr0hc2Lfiry3Gnmdd71/q/KokHPzW9sytEAyLaKD3lIhfJ5eA4Blo1NjXaRbx/0/1zkR koBYiKmiVV4Y4fAiUvqZFD/Tp3Nuvfnkb2MTl+ZnnPniwH8hgL0WdwoCYIBLQoK5sv3DOWb4oADUx HWBLyOQEI2lr1tC/80ZrH5BoZLYhMILGTRyYHQTeLf630q3iN8wB2ydP5v3FD3Y9Lw2/gAQAXZvN4 W0mzpJoR6ovckE5i5sIw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mYma4-002HZA-3q; Fri, 08 Oct 2021 09:54:20 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mYmZy-002HYV-Qd for linux-arm-kernel@lists.infradead.org; Fri, 08 Oct 2021 09:54:17 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7E9CB61027 for ; Fri, 8 Oct 2021 09:54:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1633686854; bh=OMlOXTokdMWcBUbxKYoc3X9Y1m4UquW+X5R5e5QXvvA=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=Ed3Z75B4l1wmxaBRuvpBM9HMPO1Dn4TqJopBkjhfPah7AECDaTpfGzQmQxfUUQVfP mZx0nf+p379I5qASWjgBkhP5qf+Fr63b9s8LZhHTXR98TYlfyTGfxnLI3Ilk/pMihd DjZ55Z9iqkNMeuMiGaZcyv3JJdyYH5o1hjP0vwBkFkf44iaDG+PIjTZFRTHrgqVWzm 1Cd42qvmZp8/0lJou1gvE9KbJfkrav0xoufK3jYoIfD2rfpnYiI6pdw2a7c+Cr6lWh 3/2fFt6j2nX9f0VErL0rkjicVoznT5ET/ypIUXD3AWQOWpuLckgqJ7fkykUAB95YwX I/66XGcZASuXg== Received: by mail-oi1-f174.google.com with SMTP id a3so13027554oid.6 for ; Fri, 08 Oct 2021 02:54:14 -0700 (PDT) X-Gm-Message-State: AOAM532APHB0IDnCh+u8s7TZA6UlN/OtzktDXx1ZLAOpKrgHwKbaXaVe WiFInF9tFt7U5MMfI2gVKSu9VwZV7qmFl7xTsbo= X-Google-Smtp-Source: ABdhPJxuiL2euU4KmgO4GsbiDfBGFcGs7dDB9vYrzxwLRQK2A/oBz7zmoy4FLAm1WMcLOhuW2pLgjFawkHfCaZHXDpk= X-Received: by 2002:a05:6808:1148:: with SMTP id u8mr6883345oiu.33.1633686853650; Fri, 08 Oct 2021 02:54:13 -0700 (PDT) MIME-Version: 1.0 References: <20211008074127.435364-1-ardb@kernel.org> In-Reply-To: <20211008074127.435364-1-ardb@kernel.org> From: Ard Biesheuvel Date: Fri, 8 Oct 2021 11:54:02 +0200 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 0/5] ARM: add vmap'ed stack support To: Linux ARM , Russell King Cc: Nicolas Pitre , Arnd Bergmann , Kees Cook , Keith Packard , Linus Walleij X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211008_025414_935001_9742CBD4 X-CRM114-Status: GOOD ( 13.00 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 8 Oct 2021 at 09:41, Ard Biesheuvel wrote: > > This series enables support on ARM for vmap'ed task and IRQ stacks in > the kernel. This is an important hardening feature that terminates tasks > on inadvertent or deliberate accesses past the stack pointer, which > might otherwise go completely unnoticed. > Forgot to include the sample output from lkdtm exhausting the stack. The below is a Thumb2 build, which does not support the frame pointer unwinder, so it is using the ARM unwinder to unwind the overflown stack. / # echo EXHAUST_STACK >/sys/kernel/debug/provoke-crash/DIRECT lkdtm: Performing direct entry EXHAUST_STACK lkdtm: Calling function with 512 frame size to depth 32 ... Insufficient stack space to handle exception! Task stack: [0xe9c08000..0xe9c0a000] IRQ stack: [0xe0802000..0xe0804000] Overflow stack: [0xdbbc7500..0xdbbc8500] Internal error: kernel stack overflow: 0 [#1] SMP THUMB2 Modules linked in: CPU: 0 PID: 120 Comm: sh Not tainted 5.15.0-rc1+ #991 Hardware name: Generic DT based system PC is at mmioset+0x16/0xa0 LR is at recursive_loop+0x21/0x50 pc : [] lr : [] psr: 20000033 sp : e9c07f40 ip : e9c07f44 fp : 000e3460 r10: 00000004 r9 : c0fb6770 r8 : c4186000 r7 : e9c09f78 r6 : c2142300 r5 : e9c07f44 r4 : 00000012 r3 : 12121212 r2 : 00000200 r1 : 12121212 r0 : e9c07f44 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA Thumb Segment user Control: 70c5387d Table: 441dd600 DAC: fffffffd Register r0 information: 2-page vmalloc region starting at 0xe9c08000 allocated at kernel_clone+0x41/0x2d8 Register r1 information: non-paged memory Register r2 information: non-paged memory Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: 2-page vmalloc region starting at 0xe9c08000 allocated at kernel_clone+0x41/0x2d8 Register r6 information: slab task_struct start c2142300 pointer offset 0 Register r7 information: 2-page vmalloc region starting at 0xe9c08000 allocated at kernel_clone+0x41/0x2d8 Register r8 information: non-slab/vmalloc memory Register r9 information: non-slab/vmalloc memory Register r10 information: non-paged memory Register r11 information: non-paged memory Register r12 information: 2-page vmalloc region starting at 0xe9c08000 allocated at kernel_clone+0x41/0x2d8 Process sh (pid: 120, stack limit = 0x(ptrval)) Stack: (0xe9c07f40 to 0xe9c0a000) 7f40: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ???????? 7f60: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ???????? 7f80: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ???????? 7fa0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ???????? 7fc0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ???????? 7fe0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ???????? 8000: 57ac6e9d 00000000 00000000 00000000 00000000 00000000 00000000 00000000 8020: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 8040: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 8060: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 8080: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 80a0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 80c0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 80e0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 8100: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 8120: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 8140: 00000000 47ece8b1 00000013 e9c0815c c2142300 c091aec3 00000000 13131313 8160: 13131313 13131313 13131313 13131313 13131313 13131313 13131313 13131313 8180: 13131313 13131313 13131313 13131313 13131313 13131313 13131313 13131313 81a0: 13131313 13131313 13131313 13131313 13131313 13131313 13131313 13131313 81c0: 13131313 13131313 13131313 13131313 13131313 13131313 13131313 13131313 81e0: 13131313 13131313 13131313 13131313 13131313 13131313 13131313 13131313 8200: 13131313 13131313 13131313 13131313 13131313 13131313 13131313 13131313 8220: 13131313 13131313 13131313 13131313 13131313 13131313 13131313 13131313 8240: 13131313 13131313 13131313 13131313 13131313 13131313 13131313 13131313 8260: 13131313 13131313 13131313 13131313 13131313 13131313 13131313 13131313 8280: 13131313 13131313 13131313 13131313 13131313 13131313 13131313 13131313 82a0: 13131313 13131313 13131313 13131313 13131313 13131313 13131313 13131313 82c0: 13131313 13131313 13131313 13131313 13131313 13131313 13131313 13131313 82e0: 13131313 13131313 13131313 13131313 13131313 13131313 13131313 13131313 8300: 13131313 13131313 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20202020 20202020 20202020 20202020 9e40: 20202020 20202020 20202020 20202020 20202020 20202020 20202020 20202020 9e60: 20202020 20202020 20202020 20202020 20202020 20202020 20202020 20202020 9e80: 20202020 20202020 20202020 20202020 20202020 47ece8b1 c17b5920 c1245ebc 9ea0: 0000000e c0d29257 00000006 c091adbf e9c09f78 c091ad19 c33cea80 000e6428 9ec0: 0000000e c2c237f8 e9c09f78 c0690123 e9c09f78 c33cea80 e9c09f78 000e6428 9ee0: c2142300 0000000e c06900f1 c0535171 00000000 00000000 00000000 00000000 9f00: c42203f8 dbc5d414 00000000 00000000 0000000a 47ece8b1 00000000 e9c09fb0 9f20: 0007b5f4 c2142300 80000207 c4195200 c180f5a0 c180f580 c4195240 c040fc2d 9f40: 00000000 00000072 000e3460 c04382d1 47ece8b1 47ece8b1 c33cea80 c33cea80 9f60: 000e6428 c2142300 00000000 00000000 00000004 c0535481 00000000 00000000 9f80: 000e3460 47ece8b1 c0400364 00000001 b6f62070 000e6428 00000004 c0400364 9fa0: c2142300 c0400161 00000001 b6f62070 00000001 000e6428 0000000e 00000000 9fc0: 00000001 b6f62070 000e6428 00000004 000e2c7c 00000020 000e3444 000e3460 9fe0: 000e23b8 be8db878 b6e89960 b6e8997c 60000010 00000001 00000000 00000000 [] (mmioset) from [] (recursive_loop+0x21/0x50) [] (recursive_loop) from [] (recursive_loop+0x47/0x50) [] (recursive_loop) from [] (recursive_loop+0x47/0x50) [] (recursive_loop) from [] (recursive_loop+0x47/0x50) [] (recursive_loop) from [] (recursive_loop+0x47/0x50) [] (recursive_loop) from [] (recursive_loop+0x47/0x50) [] (recursive_loop) from [] (recursive_loop+0x47/0x50) [] (recursive_loop) from [] (recursive_loop+0x47/0x50) [] (recursive_loop) from [] (recursive_loop+0x47/0x50) [] (recursive_loop) from [] (recursive_loop+0x47/0x50) [] (recursive_loop) from [] (recursive_loop+0x47/0x50) [] (recursive_loop) from [] (recursive_loop+0x47/0x50) [] (recursive_loop) from [] (recursive_loop+0x47/0x50) [] (recursive_loop) from [] (recursive_loop+0x47/0x50) [] (recursive_loop) from [] (recursive_loop+0x47/0x50) [] (recursive_loop) from [] (lkdtm_EXHAUST_STACK+0x23/0x32) [] (lkdtm_EXHAUST_STACK) from [] (direct_entry+0xa7/0xf0) [] (direct_entry) from [] (full_proxy_write+0x33/0x54) [] (full_proxy_write) from [] (vfs_write+0x8d/0x2c8) [] (vfs_write) from [] (ksys_write+0x41/0x90) [] (ksys_write) from [] (ret_fast_syscall+0x1/0x54) Code: 4101 460b 2a10 db1f (e92d) 4100 ---[ end trace 5dfadbdbe8c81ed8 ]--- _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel