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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 3B07AC433FE for ; Tue, 11 Oct 2022 15:03:17 +0000 (UTC) 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:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=lOl83kIsqP37ZgblR/a90FgSPMYkH/Ft0sSl1DOUWMo=; b=AkRsRtVO29lYYY ufhxZPNmmwPFSNApLYY2/ngUiYSICgUjTudTE2Y7AWqlqEWpNn3FX7zAH1F4RxqEUlJfRpHG+XxIZ AsuB8QxUKvfNkS92b92qX+PFakK8+0c0nlW7fY17Xckgm4boWhrIRDf6aeq/kvnNAnaIKHU74T/wD Qu/MBPpiL7WY8j3C828vxb5KDL68IxBrDcRTi5FGIpMwpkPFc9RyGV61Tqwn+l9wfWBx8U0dEOTMo snxRf4TpzeYLcZd9wQrktmtEIRpnybmlH6koK4IW/sSWdwYcSi95QbbAMu6IzjzVang+D8adtGl9V zPXyKbD5hBSdzHwxW6yw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oiGlW-004d4R-DQ; Tue, 11 Oct 2022 15:01:54 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oiGbQ-004XnE-Ac for linux-arm-kernel@lists.infradead.org; Tue, 11 Oct 2022 14:51:29 +0000 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 dfw.source.kernel.org (Postfix) with ESMTPS id E0636611AB; Tue, 11 Oct 2022 14:51:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 46352C433C1; Tue, 11 Oct 2022 14:51:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1665499887; bh=zx+NsFJM2HlrPk63IXXZIbC844ngJf0rvo8h74tKeLo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CEEXdkccXbWuMU1O4+agxLyKOLtdYWhy1rrkE7F9vNB/6+scPbBIMsf7zPgBGeCTO xNxzaSrXMqUhcX3MVm7Hc8anDQbQ6dD5GZuV6+3enGBrvK8kWfr9/xGJK7ae3eCaJS RK24yvNQsqFU22yU2LArdsGYYl6KKBjmPCq38aaLMvVyTpfeTLK40/inIqeXKsD0zw SuAbxVBzw49H5r4EyH6c+/Qld9hc5POdLt4HENgyuIqFCCll1C8ExrXoLaS+gXTDOv LLYcjHuScfTYYdUzlCBT1DW1Cx2HmFe8I8Hn+0bM1lxLMdzJdY69CCAET7aoOg06G4 dy7i1ok5yG3dA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Alex Sverdlin , Linus Walleij , Russell King , Sasha Levin , aryabinin@virtuozzo.com, linux@armlinux.org.uk, kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 6.0 45/46] ARM: 9242/1: kasan: Only map modules if CONFIG_KASAN_VMALLOC=n Date: Tue, 11 Oct 2022 10:50:13 -0400 Message-Id: <20221011145015.1622882-45-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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221011_075128_478786_5955072D X-CRM114-Status: GOOD ( 14.63 ) 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 From: Alex Sverdlin [ Upstream commit 823f606ab6b4759a1faf0388abcf4fb0776710d2 ] In case CONFIG_KASAN_VMALLOC=y kasan_populate_vmalloc() allocates the shadow pages dynamically. But even worse is that kasan_release_vmalloc() releases them, which is not compatible with create_mapping() of MODULES_VADDR..MODULES_END range: BUG: Bad page state in process kworker/9:1 pfn:2068b page:e5e06160 refcount:0 mapcount:0 mapping:00000000 index:0x0 flags: 0x1000(reserved) raw: 00001000 e5e06164 e5e06164 00000000 00000000 00000000 ffffffff 00000000 page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set bad because of flags: 0x1000(reserved) Modules linked in: ip_tables CPU: 9 PID: 154 Comm: kworker/9:1 Not tainted 5.4.188-... #1 Hardware name: LSI Axxia AXM55XX Workqueue: events do_free_init unwind_backtrace show_stack dump_stack bad_page free_pcp_prepare free_unref_page kasan_depopulate_vmalloc_pte __apply_to_page_range apply_to_existing_page_range kasan_release_vmalloc __purge_vmap_area_lazy _vm_unmap_aliases.part.0 __vunmap do_free_init process_one_work worker_thread kthread Reviewed-by: Linus Walleij Signed-off-by: Alexander Sverdlin Signed-off-by: Russell King (Oracle) Signed-off-by: Sasha Levin --- arch/arm/mm/kasan_init.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/arm/mm/kasan_init.c b/arch/arm/mm/kasan_init.c index 29caee9c79ce..46d9f4a622cb 100644 --- a/arch/arm/mm/kasan_init.c +++ b/arch/arm/mm/kasan_init.c @@ -268,12 +268,17 @@ void __init kasan_init(void) /* * 1. The module global variables are in MODULES_VADDR ~ MODULES_END, - * so we need to map this area. + * so we need to map this area if CONFIG_KASAN_VMALLOC=n. With + * VMALLOC support KASAN will manage this region dynamically, + * refer to kasan_populate_vmalloc() and ARM's implementation of + * module_alloc(). * 2. PKMAP_BASE ~ PKMAP_BASE+PMD_SIZE's shadow and MODULES_VADDR * ~ MODULES_END's shadow is in the same PMD_SIZE, so we can't * use kasan_populate_zero_shadow. */ - create_mapping((void *)MODULES_VADDR, (void *)(PKMAP_BASE + PMD_SIZE)); + if (!IS_ENABLED(CONFIG_KASAN_VMALLOC) && IS_ENABLED(CONFIG_MODULES)) + create_mapping((void *)MODULES_VADDR, (void *)(MODULES_END)); + create_mapping((void *)PKMAP_BASE, (void *)(PKMAP_BASE + PMD_SIZE)); /* * KAsan may reuse the contents of kasan_early_shadow_pte directly, so -- 2.35.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel