From patchwork Tue Dec 14 04:01:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pingfan Liu X-Patchwork-Id: 12696029 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 2897EC433EF for ; Tue, 14 Dec 2021 04:04:55 +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=icMi3JaOHLB0Eet7BoEWOlk5ABwx46D1NHZPQJfRvtY=; b=0fJprFxvzNRf1Q //O6Y/1lUgCloqPjQRpKgQKPwNJK3fk7nWI6PX1DBt+5xdDoKotyiT9ut49yNStU3v6gSbsLuoDgK mS95XW7mhM+4NnFJ2GOwJfcv2fOd6UJtK3auRbAq7w0850dfp/J/hAvLJaxHFEJdHERVo46oSaC3q dfX+jJ+pRAzVEx5WjbggHuuuqapYNxzVHxgcHg33z0SNLgkmef8m6s8bqSlhHxQr4ydVki1dq2Q9K Izdcx01cUsL/P7csjYajfWuEfE71y89UEDr6L21Nzy4h5qTTJ6eLS2u/8Kmoq+THcoGx6UDLE5UAs kKZ5gzD85giE8ztLGjvw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mwz1x-00CUyV-NN; Tue, 14 Dec 2021 04:03:09 +0000 Received: from mail-pj1-x102c.google.com ([2607:f8b0:4864:20::102c]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mwz1G-00CUkQ-RZ for linux-arm-kernel@lists.infradead.org; Tue, 14 Dec 2021 04:02:28 +0000 Received: by mail-pj1-x102c.google.com with SMTP id iq11so13372688pjb.3 for ; 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=GiHr5EPfKrjrPNMJUjDAYPfGt5UKzBzFljHj4Qzpb+mu1WBIQ6IIQRABeMZ88gpdib ib8c9OKcZbs6y8r21gw8bxM10m6CZ1oylUPyjrvo923+xz3KmSq6olwxzIqqbcVaQatD Q/Z91SZXde8PyaGPHEKSb7mBcwtSysYqFVKzUsb89skB3RLdHqIsNnri6uz2RtrUCjZY AzUVM04+zFK0etIJP3y+kDnkswuTKlbG/Go1mz+qWvD88awS//MsocrbzC8sVPEQOnHF b1cpQNZZEjHQj3jAUzYjLtcTCcE8wZmsPKQ5zhgAJMGfc1cM2V4hBynASL16IjvImw5S sjrg== X-Gm-Message-State: AOAM5322vAL4O894cPSMU1Zj/g34OIj4Akm7V8JgY4QSgwB/SdBxdDM2 yJnfgEzm5VScmmHm1rXUFH3pqzHSJQ== 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211213_200226_961610_DED51FC6 X-CRM114-Status: GOOD ( 18.68 ) 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 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);