Re: [PATCH v4] x86/boot: Use efi_setup_data for searching RSDP on kexec-ed kernel

[Junichi Nomura]

On 4/11/19 9:58 PM, Borislav Petkov wrote:
> Something like this based on your v3. I still need to figure out a
> reliable way to check in kexec_get_rsdp_addr() whether we're a kexec-ed
> kernel but other than that, it should look something like this:

Thank you.

> +static struct efi_setup_data *get_kexec_setup_data_addr(void)
> +{
> +	struct setup_data *data;
> +	u64 pa_data;
> +
> +	pa_data = boot_params->hdr.setup_data;
> +	while (pa_data) {
> +		data = (struct setup_data *) pa_data;
> +		if (data->type == SETUP_EFI)
> +			return (struct efi_setup_data *)(pa_data + sizeof(struct setup_data));
> +
> +		pa_data = data->next;
> +	}
> +	return NULL;
> +}

Without #ifdef CONFIG_X86_64, I got compiler warnings on 32bit build
about casting u64 to pointer.

> +/* EFI/kexec support is 64-bit only. */
> +static acpi_physical_address kexec_get_rsdp_addr(void)
> +{

We need #ifdef CONFIG_EFI to avoid build failure about undefined
__efi_get_rsdp_addr().

> +	efi_system_table_64_t *systab;
> +	struct efi_setup_data *esd;
> +	struct efi_info *ei;
> +	char *sig;
> +
> +	if (!IS_ENABLED(CONFIG_X86_64))
> +		return 0;
> +
> +	esd = get_kexec_setup_data_addr();
> +	if (!esd)
> +		return EFI_SETUP_DATA_INVALID;
>  
> +	if (!esd->tables) {
> +		debug_putstr("Wrong kexec SETUP_EFI data.\n");
> +		return 0;
> +	}

I think that should be the other way around:

	esd = get_kexec_setup_data_addr();
	if (!esd) // the kernel is not kexec booted
		return 0;

	if (!esd->tables) {  // kexec booted but data is invalid
		debug_putstr("Wrong kexec SETUP_EFI data.\n");
		return EFI_SETUP_DATA_INVALID;
	}

And other error returns in kexec_get_rsdp_addr() should also be
EFI_SETUP_DATA_INVALID.

> +	/* Get systab from boot params. */
> +	systab = (efi_system_table_64_t *) (ei->efi_systab | ((__u64)ei->efi_systab_hi << 32));

Though there is !IS_ENABLED(CONFIG_X86_64), compiler still sees this
code and emits warning on 32bit build.

To fix 32bit build warnings, non-EFI build errors and return
values from kexec_get_rsdp_addr(), the patch becomes:

diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c
index 0ef4ad5..715a8b0 100644
--- a/arch/x86/boot/compressed/acpi.c
+++ b/arch/x86/boot/compressed/acpi.c
@@ -8,6 +8,8 @@
 #include <linux/efi.h>
 #include <asm/efi.h>
 
+#define EFI_SETUP_DATA_INVALID -1ULL
+
 /*
  * Longest parameter of 'acpi=' is 'copy_dsdt', plus an extra '\0'
  * for termination.
@@ -44,17 +46,114 @@ static acpi_physical_address get_acpi_rsdp(void)
 	return addr;
 }
 
-/* Search EFI system tables for RSDP. */
-static acpi_physical_address efi_get_rsdp_addr(void)
+static struct efi_setup_data *get_kexec_setup_data_addr(void)
+{
+#if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
+	struct setup_data *data;
+	u64 pa_data;
+
+	pa_data = boot_params->hdr.setup_data;
+	while (pa_data) {
+		data = (struct setup_data *) pa_data;
+		if (data->type == SETUP_EFI)
+			return (struct efi_setup_data *)(pa_data + sizeof(struct setup_data));
+
+		pa_data = data->next;
+	}
+#endif
+	return NULL;
+}
+
+#ifdef CONFIG_EFI
+/*
+ * Search EFI system tables for RSDP.  If both ACPI_20_TABLE_GUID and
+ * ACPI_TABLE_GUID are found, take the former, which has more features.
+ */
+static acpi_physical_address
+__efi_get_rsdp_addr(unsigned long config_tables, unsigned int nr_tables,
+		    bool efi_64)
+{
+	acpi_physical_address rsdp_addr = 0;
+	int i;
+
+	/* Get EFI tables from systab. */
+	for (i = 0; i < nr_tables; i++) {
+		acpi_physical_address table;
+		efi_guid_t guid;
+
+		if (efi_64) {
+			efi_config_table_64_t *tbl = (efi_config_table_64_t *) config_tables + i;
+
+			guid  = tbl->guid;
+			table = tbl->table;
+
+			if (!IS_ENABLED(CONFIG_X86_64) && table >> 32) {
+				debug_putstr("Error getting RSDP address: EFI config table located above 4GB.\n");
+				return 0;
+			}
+		} else {
+			efi_config_table_32_t *tbl = (efi_config_table_32_t *) config_tables + i;
+
+			guid  = tbl->guid;
+			table = tbl->table;
+		}
+
+		if (!(efi_guidcmp(guid, ACPI_TABLE_GUID)))
+			rsdp_addr = table;
+		else if (!(efi_guidcmp(guid, ACPI_20_TABLE_GUID)))
+			return table;
+	}
+
+	return rsdp_addr;
+}
+#endif
+
+/* EFI/kexec support is 64-bit only. */
+static acpi_physical_address kexec_get_rsdp_addr(void)
 {
 	acpi_physical_address rsdp_addr = 0;
+#if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
+	efi_system_table_64_t *systab;
+	struct efi_setup_data *esd;
+	struct efi_info *ei;
+	char *sig;
+
+	esd = get_kexec_setup_data_addr();
+	if (!esd)
+		return 0;
 
+	if (!esd->tables) {
+		debug_putstr("Wrong kexec SETUP_EFI data.\n");
+		return EFI_SETUP_DATA_INVALID;
+	}
+
+	ei = &boot_params->efi_info;
+	sig = (char *)&ei->efi_loader_signature;
+	if (strncmp(sig, EFI64_LOADER_SIGNATURE, 4)) {
+		debug_putstr("Wrong kexec EFI loader signature.\n");
+		return EFI_SETUP_DATA_INVALID;
+	}
+
+	/* Get systab from boot params. */
+	systab = (efi_system_table_64_t *) (ei->efi_systab | ((__u64)ei->efi_systab_hi << 32));
+	if (!systab)
+		error("EFI system table not found in kexec boot_params.");
+
+	rsdp_addr = __efi_get_rsdp_addr((unsigned long)esd->tables, systab->nr_tables, true);
+	if (!rsdp_addr)
+		return EFI_SETUP_DATA_INVALID;
+#endif
+
+	return rsdp_addr;
+}
+
+static acpi_physical_address efi_get_rsdp_addr(void)
+{
 #ifdef CONFIG_EFI
-	unsigned long systab, systab_tables, config_tables;
+	unsigned long systab, config_tables;
 	unsigned int nr_tables;
 	struct efi_info *ei;
 	bool efi_64;
-	int size, i;
 	char *sig;
 
 	ei = &boot_params->efi_info;
@@ -88,49 +187,20 @@ static acpi_physical_address efi_get_rsdp_addr(void)
 
 		config_tables	= stbl->tables;
 		nr_tables	= stbl->nr_tables;
-		size		= sizeof(efi_config_table_64_t);
 	} else {
 		efi_system_table_32_t *stbl = (efi_system_table_32_t *)systab;
 
 		config_tables	= stbl->tables;
 		nr_tables	= stbl->nr_tables;
-		size		= sizeof(efi_config_table_32_t);
 	}
 
 	if (!config_tables)
 		error("EFI config tables not found.");
 
-	/* Get EFI tables from systab. */
-	for (i = 0; i < nr_tables; i++) {
-		acpi_physical_address table;
-		efi_guid_t guid;
-
-		config_tables += size;
-
-		if (efi_64) {
-			efi_config_table_64_t *tbl = (efi_config_table_64_t *)config_tables;
-
-			guid  = tbl->guid;
-			table = tbl->table;
-
-			if (!IS_ENABLED(CONFIG_X86_64) && table >> 32) {
-				debug_putstr("Error getting RSDP address: EFI config table located above 4GB.\n");
-				return 0;
-			}
-		} else {
-			efi_config_table_32_t *tbl = (efi_config_table_32_t *)config_tables;
-
-			guid  = tbl->guid;
-			table = tbl->table;
-		}
-
-		if (!(efi_guidcmp(guid, ACPI_TABLE_GUID)))
-			rsdp_addr = table;
-		else if (!(efi_guidcmp(guid, ACPI_20_TABLE_GUID)))
-			return table;
-	}
+	return __efi_get_rsdp_addr(config_tables, nr_tables, efi_64);
+#else
+	return 0;
 #endif
-	return rsdp_addr;
 }
 
 static u8 compute_checksum(u8 *buffer, u32 length)
@@ -221,6 +291,12 @@ acpi_physical_address get_rsdp_addr(void)
 		pa = boot_params->acpi_rsdp_addr;
 
 	if (!pa)
+		pa = kexec_get_rsdp_addr();
+
+	if (pa == EFI_SETUP_DATA_INVALID)
+		return 0;
+
+	if (!pa)
 		pa = efi_get_rsdp_addr();
 
 	if (!pa)
diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index c0d6c56..e98f8cf 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -379,6 +379,7 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
 	debug_putaddr(output);
 	debug_putaddr(output_len);
 	debug_putaddr(kernel_total_size);
+	debug_putaddr(boot_params->acpi_rsdp_addr);
 
 #ifdef CONFIG_X86_64
 	/* Report address of 32-bit trampoline */