ACPI: tables: x86: Reserve memory occupied by ACPI tables

commit 1a1c130ab7575498eed5bcf7220037ae09cd1f8a upstream.

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 <george.kennedy@oracle.com>
Tested-by: George Kennedy <george.kennedy@oracle.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>
Cc: 5.10+ <stable@vger.kernel.org> # 5.10+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 7303bb398862c08ece19fb2cf06929280592eddd..b35c34cfbe5228fd46c8f7e383e387e068b701ab 100644 (file)
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -1565,10 +1565,18 @@ 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);
 
@@ -1581,18 +1589,9 @@ 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

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 90ecc108bc8a52ea1091544c8927c9755a75495f..c35795ff5c16703a62b051513790734a17d92584 100644 (file)
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1097,6 +1097,9 @@ 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();
 
@@ -1183,11 +1186,6 @@ 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();

diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index a3d012b08fc5cc982e019f7049e90458012c8419..041ee23819276e52ad1b169f9a8560f3b10e5baf 100644 (file)
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -732,7 +732,7 @@ acpi_os_table_override(struct acpi_table_header *existing_table,
 }
 
 /*
- * acpi_table_init()
+ * acpi_locate_initial_tables()
  *
  * find RSDP, find and checksum SDT/XSDT.
  * checksum all tables, print SDT/XSDT
@@ -740,7 +740,7 @@ acpi_os_table_override(struct acpi_table_header *existing_table,
  * result: sdt_entry[] is initialized
  */
 
-int __init acpi_table_init(void)
+int __init acpi_locate_initial_tables(void)
 {
        acpi_status status;
 
@@ -755,9 +755,45 @@ 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;
 }
 

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 019468f072b7d57ffa060a41aeaa143bc7e9b203..1a37748766b70660faea7792294931de78398ce5 100644 (file)
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -230,10 +230,14 @@ void __iomem *__acpi_map_table(unsigned long phys, unsigned long size);
 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,
@@ -734,9 +738,12 @@ 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)