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 9E483C433F5 for ; Tue, 14 Dec 2021 04:02:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230216AbhLNEC1 (ORCPT ); Mon, 13 Dec 2021 23:02:27 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59446 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233009AbhLNEC0 (ORCPT ); Mon, 13 Dec 2021 23:02:26 -0500 Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6C5ABC061748; Mon, 13 Dec 2021 20:02:26 -0800 (PST) Received: by mail-pj1-x1033.google.com with SMTP id h24so13383301pjq.2; Mon, 13 Dec 2021 20:02:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=unuIgf9/4EE+PYhcjHdU50UjtVV7zsVyUp8W6zJe7os=; b=NJv1Blk7gSCHkSiUVwFjgpD+kqHW2hDK2cJbb/T9GM2WiWHOWhpvZxD7GsUYlFlsvi jWeV7BgrOzY5liIRcWI0pH20D0kesnzF8pHfXwuXvhjrd24TZHDvkS2HTd/zWHh+D5NJ aBaL5pdTnIRZD0ioTyCp3do8PeX9RgThbsUWDLSn6n45g2iZc/OlzB0lTDxKYw7Npr8k afXPS59zJ03dEYxBsMgsE66WXqaEXW8owo22GU4F5qgaPQxC7BRIb9Awz5Qa5sYvNeF3 i3LiLJ9PLtRT1Jo99pxW1dSy5s+N7cQaW3ZM4WWCmONLrgkb8JFIhHpVIzdBCYxAiBWu 6msA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=unuIgf9/4EE+PYhcjHdU50UjtVV7zsVyUp8W6zJe7os=; b=JCXgEuK1/hMJgH0ZIcEowQoue5G8bX9ldTb/HoMelbKWVIv9WRQG5oLXAehK0Bb6uk wmB74r7cEcB9LHEjJJytJHzyLZ2Ef/H9+mHBlATBeEm4h+vk8EnVSr75nMbIzAuscLsc Y+DpQLdd3QTwc+AhRaIL0adjvD8SynCsp+XxPijsPShYbkehWEO3Ax8KAFXCnh9OMrnw CofjylUux0ReOP5basNGV7V9fOSqhyTgkMThGQM3pYSzMvrLt14odwQlUtb4FtnF8EHF dXL4AC46JYAmGLxYGtq/0FHRiDwNO9pOEg8otCUuKOhAyBmx07n7tFd/ZZNpHh6hH9hU Y0ag== X-Gm-Message-State: AOAM532QQ20L67g/ySSSPek4fE4GS1d8ALsadgGyoEA6kl8l+SSbWUl6 xlm3JXRqVbNMb3++zQMCHPLFxAc+Nw== X-Google-Smtp-Source: ABdhPJzTYCptVGmQKgXaj3FS5cTH6owqKBUG7SMNp2vFlzAM4YaxA8mB0Cn1PogHz9xDP4hCX5xkIg== X-Received: by 2002:a17:902:c943:b0:142:1758:8ee7 with SMTP id i3-20020a170902c94300b0014217588ee7mr2685847pla.58.1639454545684; Mon, 13 Dec 2021 20:02:25 -0800 (PST) Received: from piliu.users.ipa.redhat.com ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id v63sm11538777pgv.71.2021.12.13.20.02.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Dec 2021 20:02:25 -0800 (PST) From: Pingfan Liu To: devicetree@vger.kernel.org, linux-efi@vger.kernel.org Cc: Pingfan Liu , Rob Herring , Zhen Lei , Catalin Marinas , Will Deacon , Andrew Morton , Mike Rapoport , Geert Uytterhoeven , Frank Rowand , Ard Biesheuvel , Nick Terrell , linux-arm-kernel@lists.infradead.org Subject: [PATCHv2 2/2] efi: apply memblock cap after memblock_add() Date: Tue, 14 Dec 2021 12:01:57 +0800 Message-Id: <20211214040157.27443-3-kernelfans@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211214040157.27443-1-kernelfans@gmail.com> References: <20211214040157.27443-1-kernelfans@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On arm64, during kdump kernel saves vmcore, it runs into the following bug: ... [ 15.148919] usercopy: Kernel memory exposure attempt detected from SLUB object 'kmem_cache_node' (offset 0, size 4096)! [ 15.159707] ------------[ cut here ]------------ [ 15.164311] kernel BUG at mm/usercopy.c:99! [ 15.168482] Internal error: Oops - BUG: 0 [#1] SMP [ 15.173261] Modules linked in: xfs libcrc32c crct10dif_ce ghash_ce sha2_ce sha256_arm64 sha1_ce sbsa_gwdt ast i2c_algo_bit drm_vram_helper drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops cec drm_ttm_helper ttm drm nvme nvme_core xgene_hwmon i2c_designware_platform i2c_designware_core dm_mirror dm_region_hash dm_log dm_mod overlay squashfs zstd_decompress loop [ 15.206186] CPU: 0 PID: 542 Comm: cp Not tainted 5.16.0-rc4 #1 [ 15.212006] Hardware name: GIGABYTE R272-P30-JG/MP32-AR0-JG, BIOS F12 (SCP: 1.5.20210426) 05/13/2021 [ 15.221125] pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 15.228073] pc : usercopy_abort+0x9c/0xa0 [ 15.232074] lr : usercopy_abort+0x9c/0xa0 [ 15.236070] sp : ffff8000121abba0 [ 15.239371] x29: ffff8000121abbb0 x28: 0000000000003000 x27: 0000000000000000 [ 15.246494] x26: 0000000080000400 x25: 0000ffff885c7000 x24: 0000000000000000 [ 15.253617] x23: 000007ff80400000 x22: ffff07ff80401000 x21: 0000000000000001 [ 15.260739] x20: 0000000000001000 x19: ffff07ff80400000 x18: ffffffffffffffff [ 15.267861] x17: 656a626f2042554c x16: 53206d6f72662064 x15: 6574636574656420 [ 15.274983] x14: 74706d6574746120 x13: 2129363930342065 x12: 7a6973202c302074 [ 15.282105] x11: ffffc8b041d1b148 x10: 00000000ffff8000 x9 : ffffc8b04012812c [ 15.289228] x8 : 00000000ffff7fff x7 : ffffc8b041d1b148 x6 : 0000000000000000 [ 15.296349] x5 : 0000000000000000 x4 : 0000000000007fff x3 : 0000000000000000 [ 15.303471] x2 : 0000000000000000 x1 : ffff07ff8c064800 x0 : 000000000000006b [ 15.310593] Call trace: [ 15.313027] usercopy_abort+0x9c/0xa0 [ 15.316677] __check_heap_object+0xd4/0xf0 [ 15.320762] __check_object_size.part.0+0x160/0x1e0 [ 15.325628] __check_object_size+0x2c/0x40 [ 15.329711] copy_oldmem_page+0x7c/0x140 [ 15.333623] read_from_oldmem.part.0+0xfc/0x1c0 [ 15.338142] __read_vmcore.constprop.0+0x23c/0x350 [ 15.342920] read_vmcore+0x28/0x34 [ 15.346309] proc_reg_read+0xb4/0xf0 [ 15.349871] vfs_read+0xb8/0x1f0 [ 15.353088] ksys_read+0x74/0x100 [ 15.356390] __arm64_sys_read+0x28/0x34 ... This bug introduced by commit b261dba2fdb2 ("arm64: kdump: Remove custom linux,usable-memory-range handling"), which moves memblock_cap_memory_range() to fdt, but it breaches the rules that memblock_cap_memory_range() should come after memblock_add() etc as said in commit e888fa7bb882 ("memblock: Check memory add/cap ordering"). As a consequence, the virtual address set up by copy_oldmem_page() does not bail out from the test of virt_addr_valid() in check_heap_object(), and finally hits the BUG_ON(). Since memblock allocator has no idea about when the memblock is fully populated, while efi_init() is aware, so tackling this issue by calling the interface early_init_dt_check_for_usable_mem_range() exposed by of/fdt. Fixes: b261dba2fdb2 ("arm64: kdump: Remove custom linux,usable-memory-range handling") Signed-off-by: Pingfan Liu Cc: Rob Herring Cc: Zhen Lei Cc: Catalin Marinas Cc: Will Deacon Cc: Andrew Morton Cc: Mike Rapoport Cc: Geert Uytterhoeven Cc: Frank Rowand Cc: Ard Biesheuvel Cc: Nick Terrell Cc: linux-arm-kernel@lists.infradead.org To: devicetree@vger.kernel.org To: linux-efi@vger.kernel.org --- drivers/firmware/efi/efi-init.c | 7 +++++++ drivers/of/fdt.c | 2 +- include/linux/of_fdt.h | 1 + 3 files changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/firmware/efi/efi-init.c b/drivers/firmware/efi/efi-init.c index b19ce1a83f91..82d986016fa9 100644 --- a/drivers/firmware/efi/efi-init.c +++ b/drivers/firmware/efi/efi-init.c @@ -235,6 +235,13 @@ void __init efi_init(void) } reserve_regions(); +#ifdef CONFIG_OF_FLATTREE + /* + * For memblock manipulation, the cap should come after the memblock_add(). + * And now, memblock is fully populated, it is time to do capping. + */ + early_init_dt_check_for_usable_mem_range(); +#endif efi_esrt_init(); efi_mokvar_table_init(); diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 18a2df431bfd..aa07ef5cab5f 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -972,7 +972,7 @@ static unsigned long chosen_node_offset = -FDT_ERR_NOTFOUND; * location from flat tree * @node: reference to node containing usable memory range location ('chosen') */ -static void __init early_init_dt_check_for_usable_mem_range(void) +void __init early_init_dt_check_for_usable_mem_range(void) { const __be32 *prop; int len; diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h index cf48983d3c86..1d5ee19fadf7 100644 --- a/include/linux/of_fdt.h +++ b/include/linux/of_fdt.h @@ -62,6 +62,7 @@ extern int early_init_dt_scan_chosen(unsigned long node, const char *uname, int depth, void *data); extern int early_init_dt_scan_memory(unsigned long node, const char *uname, int depth, void *data); +extern void early_init_dt_check_for_usable_mem_range(void); extern int early_init_dt_scan_chosen_stdout(void); extern void early_init_fdt_scan_reserved_mem(void); extern void early_init_fdt_reserve_self(void); -- 2.31.1