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 X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AC5BCC433E0 for ; Tue, 23 Mar 2021 19:27:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 610D0619CE for ; Tue, 23 Mar 2021 19:27:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232929AbhCWT1W (ORCPT ); Tue, 23 Mar 2021 15:27:22 -0400 Received: from cloudserver094114.home.pl ([79.96.170.134]:64596 "EHLO cloudserver094114.home.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233231AbhCWT04 (ORCPT ); Tue, 23 Mar 2021 15:26:56 -0400 Received: from localhost (127.0.0.1) (HELO v370.home.net.pl) by /usr/run/smtp (/usr/run/postfix/private/idea_relay_lmtp) via UNIX with SMTP (IdeaSmtpServer 2.0.3) id f9bb4481e60bb70f; Tue, 23 Mar 2021 20:26:54 +0100 Received: from kreacher.localnet (89-64-82-61.dynamic.chello.pl [89.64.82.61]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by v370.home.net.pl (Postfix) with ESMTPSA id C569B668FEF; Tue, 23 Mar 2021 20:26:52 +0100 (CET) From: "Rafael J. Wysocki" To: ACPI Devel Maling List Cc: Mike Rapoport , "Rafael J. Wysocki" , "Rafael J. Wysocki" , Erik Kaneda , David Hildenbrand , George Kennedy , Robert Moore , Rafael Wysocki , Len Brown , Linux Kernel Mailing List , Konrad Rzeszutek Wilk , Dan Carpenter , Dhaval Giani , Andrew Morton , Vlastimil Babka , Oscar Salvador , Wei Yang , Pankaj Gupta , Michal Hocko , x86 Maintainers Subject: [PATCH] ACPI: tables: x86: Reserve memory occupied by ACPI tables Date: Tue, 23 Mar 2021 20:26:52 +0100 Message-ID: <4650320.31r3eYUQgx@kreacher> In-Reply-To: References: <3236337.DtqTXxM43S@kreacher> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="UTF-8" X-CLIENT-IP: 89.64.82.61 X-CLIENT-HOSTNAME: 89-64-82-61.dynamic.chello.pl X-VADE-SPAMSTATE: clean X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeduledrudegiedguddvhecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfjqffogffrnfdpggftiffpkfenuceurghilhhouhhtmecuudehtdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhephffvufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepteeggfelteegudehueegieekveduleeuledvueefjeefffegfeejudfgteefhefhnecuffhomhgrihhnpehkvghrnhgvlhdrohhrghenucfkphepkeelrdeigedrkedvrdeiudenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeekledrieegrdekvddriedupdhhvghlohepkhhrvggrtghhvghrrdhlohgtrghlnhgvthdpmhgrihhlfhhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqpdhrtghpthhtoheplhhinhhugidqrggtphhisehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhrtghpthhtoheprhhpphhtsehlihhnuhigrdhisghmrdgtohhmpdhrtghpthhtoheprhgrfhgrvghlsehkvghrnhgvlhdrohhrghdprhgtphhtthhopehrjhifsehrjhifhihsohgtkhhirdhnvghtpdhrtghpthhtohepvghrihhkrdhkrghnvggurgesihhnthgvlhdr tghomhdprhgtphhtthhopegurghvihgusehrvgguhhgrthdrtghomhdprhgtphhtthhopehgvghorhhgvgdrkhgvnhhnvgguhiesohhrrggtlhgvrdgtohhmpdhrtghpthhtoheprhhosggvrhhtrdhmohhorhgvsehinhhtvghlrdgtohhmpdhrtghpthhtoheprhgrfhgrvghlrdhjrdifhihsohgtkhhisehinhhtvghlrdgtohhmpdhrtghpthhtoheplhgvnhgssehkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehkohhnrhgrugdrfihilhhksehorhgrtghlvgdrtghomhdprhgtphhtthhopegurghnrdgtrghrphgvnhhtvghrsehorhgrtghlvgdrtghomhdprhgtphhtthhopeguhhgrvhgrlhdrghhirghnihesohhrrggtlhgvrdgtohhmpdhrtghpthhtoheprghkphhmsehlihhnuhigqdhfohhunhgurghtihhonhdrohhrghdprhgtphhtthhopehvsggrsghkrgesshhushgvrdgtiidprhgtphhtthhopehoshgrlhhvrgguohhrsehsuhhsvgdruggvpdhrtghpthhtoheprhhitghhrghrugdrfigvihihrghngheslhhinhhugidrrghlihgsrggsrgdrtghomhdprhgtphhtthhopehprghnkhgrjhdrghhuphhtrgdrlhhinhhugiesghhmrghilhdrtghomhdprhgtphhtthhopehmhhhotghkohesshhushgvrdgtohhmpdhrtghpthhtohepgiekieeskhgvrhhnvghlrdhorhhg X-DCC--Metrics: v370.home.net.pl 1024; Body=21 Fuz1=21 Fuz2=21 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rafael J. Wysocki The following problem has been reported by George Kennedy: Since commit 7fef431be9c9 ("mm/page_alloc: place pages to tail in __free_pages_core()") the following use after free occurs intermittently when ACPI tables are accessed. BUG: KASAN: use-after-free in ibft_init+0x134/0xc49 Read of size 4 at addr ffff8880be453004 by task swapper/0/1 CPU: 3 PID: 1 Comm: swapper/0 Not tainted 5.12.0-rc1-7a7fd0d #1 Call Trace: dump_stack+0xf6/0x158 print_address_description.constprop.9+0x41/0x60 kasan_report.cold.14+0x7b/0xd4 __asan_report_load_n_noabort+0xf/0x20 ibft_init+0x134/0xc49 do_one_initcall+0xc4/0x3e0 kernel_init_freeable+0x5af/0x66b kernel_init+0x16/0x1d0 ret_from_fork+0x22/0x30 ACPI tables mapped via kmap() do not have their mapped pages reserved and the pages can be "stolen" by the buddy allocator. Apparently, on the affected system, the ACPI table in question is not located in "reserved" memory, like ACPI NVS or ACPI Data, that will not be used by the buddy allocator, so the memory occupied by that table has to be explicitly reserved to prevent the buddy allocator from using it. In order to address this problem, rearrange the initialization of the ACPI tables on x86 to locate the initial tables earlier and reserve the memory occupied by them. The other architectures using ACPI should not be affected by this change. Link: https://lore.kernel.org/linux-acpi/1614802160-29362-1-git-send-email-george.kennedy@oracle.com/ Reported-by: George Kennedy Signed-off-by: Rafael J. Wysocki --- arch/x86/kernel/acpi/boot.c | 25 ++++++++++++------------- arch/x86/kernel/setup.c | 8 +++----- drivers/acpi/tables.c | 42 +++++++++++++++++++++++++++++++++++++++--- include/linux/acpi.h | 9 ++++++++- 4 files changed, 62 insertions(+), 22 deletions(-) Index: linux-pm/arch/x86/kernel/acpi/boot.c =================================================================== --- linux-pm.orig/arch/x86/kernel/acpi/boot.c +++ linux-pm/arch/x86/kernel/acpi/boot.c @@ -1554,10 +1554,18 @@ void __init acpi_boot_table_init(void) /* * Initialize the ACPI boot-time table parser. */ - if (acpi_table_init()) { + if (acpi_locate_initial_tables()) disable_acpi(); - return; - } + else + acpi_reserve_initial_tables(); +} + +int __init early_acpi_boot_init(void) +{ + if (acpi_disabled) + return 1; + + acpi_table_init_complete(); acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf); @@ -1570,18 +1578,9 @@ void __init acpi_boot_table_init(void) } else { printk(KERN_WARNING PREFIX "Disabling ACPI support\n"); disable_acpi(); - return; + return 1; } } -} - -int __init early_acpi_boot_init(void) -{ - /* - * If acpi_disabled, bail out - */ - if (acpi_disabled) - return 1; /* * Process the Multiple APIC Description Table (MADT), if present Index: linux-pm/arch/x86/kernel/setup.c =================================================================== --- linux-pm.orig/arch/x86/kernel/setup.c +++ linux-pm/arch/x86/kernel/setup.c @@ -1045,6 +1045,9 @@ void __init setup_arch(char **cmdline_p) cleanup_highmap(); + /* Look for ACPI tables and reserve memory occupied by them. */ + acpi_boot_table_init(); + memblock_set_current_limit(ISA_END_ADDRESS); e820__memblock_setup(); @@ -1136,11 +1139,6 @@ void __init setup_arch(char **cmdline_p) early_platform_quirks(); - /* - * Parse the ACPI tables for possible boot-time SMP configuration. - */ - acpi_boot_table_init(); - early_acpi_boot_init(); initmem_init(); Index: linux-pm/include/linux/acpi.h =================================================================== --- linux-pm.orig/include/linux/acpi.h +++ linux-pm/include/linux/acpi.h @@ -222,10 +222,14 @@ void __iomem *__acpi_map_table(unsigned void __acpi_unmap_table(void __iomem *map, unsigned long size); int early_acpi_boot_init(void); int acpi_boot_init (void); +void acpi_boot_table_prepare (void); void acpi_boot_table_init (void); int acpi_mps_check (void); int acpi_numa_init (void); +int acpi_locate_initial_tables (void); +void acpi_reserve_initial_tables (void); +void acpi_table_init_complete (void); int acpi_table_init (void); int acpi_table_parse(char *id, acpi_tbl_table_handler handler); int __init acpi_table_parse_entries(char *id, unsigned long table_size, @@ -814,9 +818,12 @@ static inline int acpi_boot_init(void) return 0; } +static inline void acpi_boot_table_prepare(void) +{ +} + static inline void acpi_boot_table_init(void) { - return; } static inline int acpi_mps_check(void) Index: linux-pm/drivers/acpi/tables.c =================================================================== --- linux-pm.orig/drivers/acpi/tables.c +++ linux-pm/drivers/acpi/tables.c @@ -780,7 +780,7 @@ acpi_status acpi_os_table_override(struc } /* - * acpi_table_init() + * acpi_locate_initial_tables() * * find RSDP, find and checksum SDT/XSDT. * checksum all tables, print SDT/XSDT @@ -788,7 +788,7 @@ acpi_status acpi_os_table_override(struc * result: sdt_entry[] is initialized */ -int __init acpi_table_init(void) +int __init acpi_locate_initial_tables(void) { acpi_status status; @@ -803,9 +803,45 @@ int __init acpi_table_init(void) status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); if (ACPI_FAILURE(status)) return -EINVAL; - acpi_table_initrd_scan(); + return 0; +} + +void __init acpi_reserve_initial_tables(void) +{ + int i; + + for (i = 0; i < ACPI_MAX_TABLES; i++) { + struct acpi_table_desc *table_desc = &initial_tables[i]; + u64 start = table_desc->address; + u64 size = table_desc->length; + + if (!start || !size) + break; + + pr_info("Reserving %4s table memory at [mem 0x%llx-0x%llx]\n", + table_desc->signature.ascii, start, start + size - 1); + + memblock_reserve(start, size); + } +} + +void __init acpi_table_init_complete(void) +{ + acpi_table_initrd_scan(); check_multiple_madt(); +} + +int __init acpi_table_init(void) +{ + int ret; + + ret = acpi_locate_initial_tables(); + if (ret) + return ret; + + acpi_table_init_complete(); + return 0; }