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ACPICA: Add detection of corrupted/replaced DSDT

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This change adds support to detect a DSDT that has been corrupted
and/or replaced from outside the OS (by firmware). This is
typically catastrophic for the system, but has been seen on
some machines.

https://bugzilla.kernel.org/show_bug.cgi?id=14679

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Lin Ming 2010-04-01 10:47:56 +08:00 committed by Len Brown
parent c1637e9c64
commit 729df0f848
5 changed files with 61 additions and 20 deletions
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5
drivers/acpi/acpica/acglobal.h
View file

@ -165,6 +165,11 @@ ACPI_EXTERN struct acpi_generic_address acpi_gbl_xpm1a_enable;
ACPI_EXTERN struct acpi_generic_address acpi_gbl_xpm1b_status;
ACPI_EXTERN struct acpi_generic_address acpi_gbl_xpm1b_enable;
/* DSDT information. Used to check for DSDT corruption */
ACPI_EXTERN struct acpi_table_desc *acpi_gbl_DSDT;
ACPI_EXTERN struct acpi_table_header acpi_gbl_original_dsdt_header;
/*
* Handle both ACPI 1.0 and ACPI 2.0 Integer widths. The integer width is
* determined by the revision of the DSDT: If the DSDT revision is less than

2
drivers/acpi/acpica/actables.h
View file

@ -107,6 +107,8 @@ u8 acpi_tb_checksum(u8 *buffer, u32 length);
acpi_status
acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length);
void acpi_tb_check_dsdt_header(void);
void
acpi_tb_install_table(acpi_physical_address address,
char *signature, u32 table_index);

4
drivers/acpi/acpica/psxface.c
View file

@ -220,6 +220,10 @@ acpi_status acpi_ps_execute_method(struct acpi_evaluate_info *info)
ACPI_FUNCTION_TRACE(ps_execute_method);
/* Quick validation of DSDT header */
acpi_tb_check_dsdt_header();
/* Validate the Info and method Node */
if (!info || !info->resolved_node) {

38
drivers/acpi/acpica/tbutils.c
View file

@ -347,6 +347,44 @@ u8 acpi_tb_checksum(u8 *buffer, u32 length)
return sum;
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_check_dsdt_header
*
* PARAMETERS: None
*
* RETURN: None
*
* DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
* if the DSDT has been replaced from outside the OS and/or if
* the DSDT header has been corrupted.
*
******************************************************************************/
void acpi_tb_check_dsdt_header(void)
{
/* Compare original length and checksum to current values */
if (acpi_gbl_original_dsdt_header.length !=
acpi_gbl_DSDT->pointer->length
|| acpi_gbl_original_dsdt_header.checksum !=
acpi_gbl_DSDT->pointer->checksum) {
ACPI_ERROR((AE_INFO,
"The DSDT has been corrupted or replaced - old, new headers below"));
acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header);
acpi_tb_print_table_header(acpi_gbl_DSDT->address,
acpi_gbl_DSDT->pointer);
/* Disable further error messages */
acpi_gbl_original_dsdt_header.length =
acpi_gbl_DSDT->pointer->length;
acpi_gbl_original_dsdt_header.checksum =
acpi_gbl_DSDT->pointer->checksum;
}
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_install_table

32
drivers/acpi/acpica/tbxface.c
View file

@ -518,33 +518,25 @@ static acpi_status acpi_tb_load_namespace(void)
(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
acpi_gbl_DSDT = &acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT];
/*
* Load the namespace. The DSDT is required, but any SSDT and PSDT tables
* are optional.
* Load the namespace. The DSDT is required, but any SSDT and
* PSDT tables are optional. Verify the DSDT.
*/
if (!acpi_gbl_root_table_list.count ||
!ACPI_COMPARE_NAME(&
(acpi_gbl_root_table_list.
tables[ACPI_TABLE_INDEX_DSDT].signature),
ACPI_SIG_DSDT)
||
ACPI_FAILURE(acpi_tb_verify_table
(&acpi_gbl_root_table_list.
tables[ACPI_TABLE_INDEX_DSDT]))) {
!ACPI_COMPARE_NAME(&acpi_gbl_DSDT->signature, ACPI_SIG_DSDT) ||
ACPI_FAILURE(acpi_tb_verify_table(acpi_gbl_DSDT))) {
status = AE_NO_ACPI_TABLES;
goto unlock_and_exit;
}
/* A valid DSDT is required */
status =
acpi_tb_verify_table(&acpi_gbl_root_table_list.
tables[ACPI_TABLE_INDEX_DSDT]);
if (ACPI_FAILURE(status)) {
status = AE_NO_ACPI_TABLES;
goto unlock_and_exit;
}
/*
* Save the original DSDT header for detection of table corruption
* and/or replacement of the DSDT from outside the OS.
*/
ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT->pointer,
sizeof(struct acpi_table_header));
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);