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Thu, 25 Feb 2021 17:33:43 +0000 Received: from DM6PR10MB3851.namprd10.prod.outlook.com ([fe80::5c53:869:7452:46da]) by DM6PR10MB3851.namprd10.prod.outlook.com ([fe80::5c53:869:7452:46da%3]) with mapi id 15.20.3868.034; Thu, 25 Feb 2021 17:33:43 +0000 Subject: Re: [PATCH] mm, kasan: don't poison boot memory To: Mike Rapoport Cc: David Hildenbrand , Andrey Konovalov , Andrew Morton , Catalin Marinas , Vincenzo Frascino , Dmitry Vyukov , Konrad Rzeszutek Wilk , Will Deacon , Andrey Ryabinin , Alexander Potapenko , Marco Elver , Peter Collingbourne , Evgenii Stepanov , Branislav Rankov , Kevin Brodsky , Christoph Hellwig , kasan-dev , Linux ARM , Linux Memory Management List , LKML , Dhaval Giani References: <20210223200914.GH1741768@linux.ibm.com> <20210223213237.GI1741768@linux.ibm.com> <450a9895-a2b4-d11b-97ca-1bd33d5308d4@oracle.com> <20210224103754.GA1854360@linux.ibm.com> <9b7251d1-7b90-db4f-fa5e-80165e1cbb4b@oracle.com> <20210225085300.GB1854360@linux.ibm.com> <9973d0e2-e28b-3f8a-5f5d-9d142080d141@oracle.com> <20210225145700.GC1854360@linux.ibm.com> <20210225160706.GD1854360@linux.ibm.com> From: George Kennedy Organization: Oracle Corporation Message-ID: <6000e7fd-bf8b-b9b0-066d-23661da8a51d@oracle.com> Date: Thu, 25 Feb 2021 12:33:34 -0500 User-Agent: Mozilla/5.0 (Windows NT 10.0; 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> > say, at the beginning of find_ibft_region()? Good news Mike! The above hack in yesterday's last patch works - 10 successful reboots. See: "BE453" below for the hack. I'll modify the patch to use "table_desc->address" instead, which is the physical address of the table. diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 7bdc023..c118dd5 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -1551,6 +1551,7 @@ void __init acpi_boot_table_init(void)      if (acpi_disabled)          return; +#if 0      /*       * Initialize the ACPI boot-time table parser.       */ @@ -1558,6 +1559,7 @@ void __init acpi_boot_table_init(void)          disable_acpi();          return;      } +#endif      acpi_table_parse(ACPI_SIG_BOOT, acpi_parse_sbf); diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 740f3bdb..b045ab2 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -571,16 +571,6 @@ void __init reserve_standard_io_resources(void)  } -static __init void reserve_ibft_region(void) -{ -    unsigned long addr, size = 0; - -    addr = find_ibft_region(&size); - -    if (size) -        memblock_reserve(addr, size); -} -  static bool __init snb_gfx_workaround_needed(void)  {  #ifdef CONFIG_PCI @@ -1033,6 +1023,12 @@ void __init setup_arch(char **cmdline_p)       */      find_smp_config(); +    /* +     * Initialize the ACPI boot-time table parser. +     */ +    if (acpi_table_init()) +        disable_acpi(); +      reserve_ibft_region();      early_alloc_pgt_buf(); diff --git a/drivers/firmware/iscsi_ibft_find.c b/drivers/firmware/iscsi_ibft_find.c index 64bb945..95fc1a6 100644 --- a/drivers/firmware/iscsi_ibft_find.c +++ b/drivers/firmware/iscsi_ibft_find.c @@ -47,7 +47,25 @@  #define VGA_MEM 0xA0000 /* VGA buffer */  #define VGA_SIZE 0x20000 /* 128kB */ -static int __init find_ibft_in_mem(void) +static void __init *acpi_find_ibft_region(void) +{ +    int i; +    struct acpi_table_header *table = NULL; +    acpi_status status; + +    if (acpi_disabled) +        return NULL; + +    for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) { +        status = acpi_get_table(ibft_signs[i].sign, 0, &table); +        if (ACPI_SUCCESS(status)) +            return table; +    } + +    return NULL; +} + +static void __init *find_ibft_in_mem(void)  {      unsigned long pos;      unsigned int len = 0; @@ -70,35 +88,52 @@ static int __init find_ibft_in_mem(void)                  /* if the length of the table extends past 1M,                   * the table cannot be valid. */                  if (pos + len <= (IBFT_END-1)) { -                    ibft_addr = (struct acpi_table_ibft *)virt;                      pr_info("iBFT found at 0x%lx.\n", pos); -                    goto done; +                    return virt;                  }              }          }      } -done: -    return len; + +    return NULL;  } + +static void __init *find_ibft(void) +{ +    /* iBFT 1.03 section 1.4.3.1 mandates that UEFI machines will +     * only use ACPI for this */ +    if (!efi_enabled(EFI_BOOT)) +        return find_ibft_in_mem(); +    else +        return acpi_find_ibft_region(); +} +  /*   * Routine used to find the iSCSI Boot Format Table. The logical   * kernel address is set in the ibft_addr global variable.   */ -unsigned long __init find_ibft_region(unsigned long *sizep) +void __init reserve_ibft_region(void)  { -    ibft_addr = NULL; +    struct acpi_table_ibft *table; +    unsigned long size; -    /* iBFT 1.03 section 1.4.3.1 mandates that UEFI machines will -     * only use ACPI for this */ +    table = find_ibft(); +    if (!table) +        return; -    if (!efi_enabled(EFI_BOOT)) -        find_ibft_in_mem(); - -    if (ibft_addr) { -        *sizep = PAGE_ALIGN(ibft_addr->header.length); -        return (u64)virt_to_phys(ibft_addr); -    } +    size = PAGE_ALIGN(table->header.length); +#if 0 +printk(KERN_ERR "XXX reserve_ibft_region: table=%llx, virt_to_phys(table)=%llx, size=%lx\n", +    (u64)table, virt_to_phys(table), size); +    memblock_reserve(virt_to_phys(table), size); +#else +printk(KERN_ERR "XXX reserve_ibft_region: table=%llx, 0x00000000BE453000, size=%lx\n", +    (u64)table, size); +    memblock_reserve(0x00000000BE453000, size); +#endif -    *sizep = 0; -    return 0; +    if (efi_enabled(EFI_BOOT)) +        acpi_put_table(&table->header); +    else +        ibft_addr = table;  } diff --git a/include/linux/iscsi_ibft.h b/include/linux/iscsi_ibft.h index b7b45ca..da813c8 100644 --- a/include/linux/iscsi_ibft.h +++ b/include/linux/iscsi_ibft.h @@ -26,13 +26,9 @@   * mapped address is set in the ibft_addr variable.   */  #ifdef CONFIG_ISCSI_IBFT_FIND -unsigned long find_ibft_region(unsigned long *sizep); +void reserve_ibft_region(void);  #else -static inline unsigned long find_ibft_region(unsigned long *sizep) -{ -    *sizep = 0; -    return 0; -} +static inline void reserve_ibft_region(void) {}  #endif  #endif /* ISCSI_IBFT_H */ Debug from the above: [    0.020293] last_pfn = 0xbfedc max_arch_pfn = 0x400000000 [    0.050778] ACPI: Early table checksum verification disabled [    0.056475] ACPI: RSDP 0x00000000BFBFA014 000024 (v02 BOCHS ) [    0.057628] ACPI: XSDT 0x00000000BFBF90E8 00004C (v01 BOCHS BXPCFACP 00000001      01000013) [    0.059341] ACPI: FACP 0x00000000BFBF5000 000074 (v01 BOCHS BXPCFACP 00000001 BXPC 00000001) [    0.061043] ACPI: DSDT 0x00000000BFBF6000 00238D (v01 BOCHS BXPCDSDT 00000001 BXPC 00000001) [    0.062740] ACPI: FACS 0x00000000BFBFD000 000040 [    0.063673] ACPI: APIC 0x00000000BFBF4000 000090 (v01 BOCHS BXPCAPIC 00000001 BXPC 00000001) [    0.065369] ACPI: HPET 0x00000000BFBF3000 000038 (v01 BOCHS BXPCHPET 00000001 BXPC 00000001) [    0.067061] ACPI: BGRT 0x00000000BE49B000 000038 (v01 INTEL EDK2     00000002      01000013) [    0.068761] ACPI: iBFT 0x00000000BE453000 000800 (v01 BOCHS BXPCFACP 00000000      00000000) [    0.070461] XXX reserve_ibft_region: table=ffffffffff240000, 0x00000000BE453000, size=1000 [    0.072231] check: Scanning 1 areas for low memory corruption George > >> [   30.308229] iBFT detected.. >> [   30.308796] >> ================================================================== >> [   30.308890] BUG: KASAN: use-after-free in ibft_init+0x134/0xc33 >> [   30.308890] Read of size 4 at addr ffff8880be453004 by task swapper/0/1 >> [   30.308890] >> [   30.308890] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.11.0-f9593a0 #12 >> [   30.308890] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS >> 0.0.0 02/06/2015 >> [   30.308890] Call Trace: >> [   30.308890]  dump_stack+0xdb/0x120 >> [   30.308890]  ? ibft_init+0x134/0xc33 >> [   30.308890]  print_address_description.constprop.7+0x41/0x60 >> [   30.308890]  ? ibft_init+0x134/0xc33 >> [   30.308890]  ? ibft_init+0x134/0xc33 >> [   30.308890]  kasan_report.cold.10+0x78/0xd1 >> [   30.308890]  ? ibft_init+0x134/0xc33 >> [   30.308890]  __asan_report_load_n_noabort+0xf/0x20 >> [   30.308890]  ibft_init+0x134/0xc33 >> [   30.308890]  ? write_comp_data+0x2f/0x90 >> [   30.308890]  ? ibft_check_initiator_for+0x159/0x159 >> [   30.308890]  ? write_comp_data+0x2f/0x90 >> [   30.308890]  ? ibft_check_initiator_for+0x159/0x159 >> [   30.308890]  do_one_initcall+0xc4/0x3e0 >> [   30.308890]  ? perf_trace_initcall_level+0x3e0/0x3e0 >> [   30.308890]  ? unpoison_range+0x14/0x40 >> [   30.308890]  ? ____kasan_kmalloc.constprop.5+0x8f/0xc0 >> [   30.308890]  ? kernel_init_freeable+0x420/0x652 >> [   30.308890]  ? __kasan_kmalloc+0x9/0x10 >> [   30.308890]  ? __sanitizer_cov_trace_pc+0x21/0x50 >> [   30.308890]  kernel_init_freeable+0x596/0x652 >> [   30.308890]  ? console_on_rootfs+0x7d/0x7d >> [   30.308890]  ? __sanitizer_cov_trace_pc+0x21/0x50 >> [   30.308890]  ? rest_init+0xf0/0xf0 >> [   30.308890]  kernel_init+0x16/0x1d0 >> [   30.308890]  ? rest_init+0xf0/0xf0 >> [   30.308890]  ret_from_fork+0x22/0x30 >> [   30.308890] >> [   30.308890] The buggy address belongs to the page: >> [   30.308890] page:0000000001b7b17c refcount:0 mapcount:0 >> mapping:0000000000000000 index:0x1 pfn:0xbe453 >> [   30.308890] flags: 0xfffffc0000000() >> [   30.308890] raw: 000fffffc0000000 ffffea0002ef9788 ffffea0002f91488 >> 0000000000000000 >> [   30.308890] raw: 0000000000000001 0000000000000000 00000000ffffffff >> 0000000000000000 >> [   30.308890] page dumped because: kasan: bad access detected >> [   30.308890] page_owner tracks the page as freed >> [   30.308890] page last allocated via order 0, migratetype Movable, >> gfp_mask 0x100dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO), pid 204, ts 28121288605 >> [   30.308890]  prep_new_page+0xfb/0x140 >> [   30.308890]  get_page_from_freelist+0x3503/0x5730 >> [   30.308890]  __alloc_pages_nodemask+0x2d8/0x650 >> [   30.308890]  alloc_pages_vma+0xe2/0x560 >> [   30.308890]  __handle_mm_fault+0x930/0x26c0 >> [   30.308890]  handle_mm_fault+0x1f9/0x810 >> [   30.308890]  do_user_addr_fault+0x6f7/0xca0 >> [   30.308890]  exc_page_fault+0xaf/0x1a0 >> [   30.308890]  asm_exc_page_fault+0x1e/0x30 >> [   30.308890] page last free stack trace: >> [   30.308890]  free_pcp_prepare+0x122/0x290 >> [   30.308890]  free_unref_page_list+0xe6/0x490 >> [   30.308890]  release_pages+0x2ed/0x1270 >> [   30.308890]  free_pages_and_swap_cache+0x245/0x2e0 >> [   30.308890]  tlb_flush_mmu+0x11e/0x680 >> [   30.308890]  tlb_finish_mmu+0xa6/0x3e0 >> [   30.308890]  exit_mmap+0x2b3/0x540 >> [   30.308890]  mmput+0x11d/0x450 >> [   30.308890]  do_exit+0xaa6/0x2d40 >> [   30.308890]  do_group_exit+0x128/0x340 >> [   30.308890]  __x64_sys_exit_group+0x43/0x50 >> [   30.308890]  do_syscall_64+0x37/0x50 >> [   30.308890]  entry_SYSCALL_64_after_hwframe+0x44/0xa9 >> [   30.308890] >> [   30.308890] Memory state around the buggy address: >> [   30.308890]  ffff8880be452f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff >> ff ff >> [   30.308890]  ffff8880be452f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff >> ff ff >> [   30.308890] >ffff8880be453000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff >> ff ff >> [   30.308890]                    ^ >> [   30.308890]  ffff8880be453080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff >> ff ff >> [   30.308890]  ffff8880be453100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff >> ff ff >> [   30.308890] >> ================================================================== >> >> George >> 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=-10.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 ABA3EC433E6 for ; Thu, 25 Feb 2021 17:36:09 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client 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