On 17/01/18 12:49, Rafael J. Wysocki wrote:
> On Tue, Jan 16, 2018 at 2:57 PM, Juergen Gross <jgross@xxxxxxxx> wrote:
>> There seem to exist several grub2 versions trashing
>> boot_params.hdr.acpi_rsdp_addr.
>>
>> So don't just believe this address to be valid, but verify it pointing
>> to a valid RSDP table.
>>
>> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
>> ---
>> To be applied on top of my RSDP series currently in tip.git x86/boot
>> Mike Galbraith has tested this patch to repair his broken boot
>> ---
>> drivers/acpi/acpica/tbxfroot.c | 36 ++++++++++++++++++++++++++++++++++++
>> drivers/acpi/osl.c | 2 +-
>> include/acpi/acpixf.h | 5 +++++
>> 3 files changed, 42 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/acpi/acpica/tbxfroot.c b/drivers/acpi/acpica/tbxfroot.c
>> index f9f9a7da2cad..9edc71780a38 100644
>> --- a/drivers/acpi/acpica/tbxfroot.c
>> +++ b/drivers/acpi/acpica/tbxfroot.c
>> @@ -249,6 +249,42 @@ ACPI_EXPORT_SYMBOL_INIT(acpi_find_root_pointer)
>>
>> /*******************************************************************************
>> *
>> + * FUNCTION: acpi_verify_root_pointer
>
> Why do you want this to go into ACPICA?
It seemed to fit in here.
>> + *
>> + *
>> + * PARAMETERS: rsdp_address - Pointer to suspected RSDP
>> + *
>> + * RETURN: AE_OK if rsdp_address really points to a RSDP, AE_NOT_FOUND
>> + * else
>> + *
>> + * DESCRIPTION: Verify a physical address being a valid RSDP
>> + *
>> + ******************************************************************************/
>> +
>> +acpi_status ACPI_INIT_FUNCTION
>> +acpi_verify_root_pointer(acpi_physical_address rsdp_address)
>> +{
>> + acpi_status status;
>> + struct acpi_table_rsdp *rsdp;
>> +
>> + ACPI_FUNCTION_TRACE(acpi_verify_root_pointer);
>> +
>> + rsdp = acpi_os_map_memory(rsdp_address, sizeof(*rsdp));
>> +
>> + if (!rsdp)
>> + return_ACPI_STATUS(AE_NO_MEMORY);
>> +
>> + status = acpi_tb_validate_rsdp(rsdp);
>> +
>> + acpi_os_unmap_memory(rsdp, sizeof(*rsdp));
>> +
>> + return_ACPI_STATUS(status);
>> +}
>> +
>> +ACPI_EXPORT_SYMBOL_INIT(acpi_verify_root_pointer)
>> +
>> +/*******************************************************************************
>> + *
>> * FUNCTION: acpi_tb_scan_memory_for_rsdp
>> *
>> * PARAMETERS: start_address - Starting pointer for search
>> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
>> index 2b77db914752..facff5c11f32 100644
>> --- a/drivers/acpi/osl.c
>> +++ b/drivers/acpi/osl.c
>> @@ -201,7 +201,7 @@ acpi_physical_address __init acpi_os_get_root_pointer(void)
>> return acpi_rsdp;
>> #endif
>> pa = acpi_arch_get_root_pointer();
>> - if (pa)
>> + if (pa && acpi_verify_root_pointer(pa) == AE_OK)
>
> All things needed could just be done locally in this file.
Okay, if you prefer it this way I can move acpi_verify_root_pointer() to
osl.c.
Juergen
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