efi: Make our variable validation list include the guid

All the variables in this list so far are defined to be in the global
namespace in the UEFI spec, so this just further ensures we're
validating the variables we think we are.

Including the guid for entries will become more important in future
patches when we decide whether or not to allow deletion of variables
based on presence in this list.

Signed-off-by: Peter Jones <pjones@redhat.com>
Tested-by: Lee, Chun-Yi <jlee@suse.com>
Acked-by: Matthew Garrett <mjg59@coreos.com>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>

diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c
index f4ff8abc5f3e9c1902dfb37450fe13a9acc204da..10e6774ab2a2248d0a04d935b773c15a38519f46 100644 (file)
--- a/drivers/firmware/efi/efivars.c
+++ b/drivers/firmware/efi/efivars.c
@@ -221,7 +221,7 @@ sanity_check(struct efi_variable *var, efi_char16_t *name, efi_guid_t vendor,
        }
 
        if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
-           efivar_validate(name, data, size) == false) {
+           efivar_validate(vendor, name, data, size) == false) {
                printk(KERN_ERR "efivars: Malformed variable content\n");
                return -EINVAL;
        }
@@ -447,7 +447,8 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
        }
 
        if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
-           efivar_validate(name, data, size) == false) {
+           efivar_validate(new_var->VendorGuid, name, data,
+                           size) == false) {
                printk(KERN_ERR "efivars: Malformed variable content\n");
                return -EINVAL;
        }

diff --git a/drivers/firmware/efi/vars.c b/drivers/firmware/efi/vars.c
index 5c5fde3e6c37738a57bebb0caf36d7ef6000a4a5..9a53da21e7b63951613e24e67b237ec9aa02740a 100644 (file)
--- a/drivers/firmware/efi/vars.c
+++ b/drivers/firmware/efi/vars.c
@@ -165,31 +165,42 @@ validate_ascii_string(efi_char16_t *var_name, int match, u8 *buffer,
 }
 
 struct variable_validate {
+       efi_guid_t vendor;
        char *name;
        bool (*validate)(efi_char16_t *var_name, int match, u8 *data,
                         unsigned long len);
 };
 
+/*
+ * This is the list of variables we need to validate.
+ *
+ * If it has a validate() method that's not NULL, it'll go into the
+ * validation routine.  If not, it is assumed valid.
+ *
+ * Note that it's sorted by {vendor,name}, but globbed names must come after
+ * any other name with the same prefix.
+ */
 static const struct variable_validate variable_validate[] = {
-       { "BootNext", validate_uint16 },
-       { "BootOrder", validate_boot_order },
-       { "DriverOrder", validate_boot_order },
-       { "Boot*", validate_load_option },
-       { "Driver*", validate_load_option },
-       { "ConIn", validate_device_path },
-       { "ConInDev", validate_device_path },
-       { "ConOut", validate_device_path },
-       { "ConOutDev", validate_device_path },
-       { "ErrOut", validate_device_path },
-       { "ErrOutDev", validate_device_path },
-       { "Timeout", validate_uint16 },
-       { "Lang", validate_ascii_string },
-       { "PlatformLang", validate_ascii_string },
-       { "", NULL },
+       { EFI_GLOBAL_VARIABLE_GUID, "BootNext", validate_uint16 },
+       { EFI_GLOBAL_VARIABLE_GUID, "BootOrder", validate_boot_order },
+       { EFI_GLOBAL_VARIABLE_GUID, "Boot*", validate_load_option },
+       { EFI_GLOBAL_VARIABLE_GUID, "DriverOrder", validate_boot_order },
+       { EFI_GLOBAL_VARIABLE_GUID, "Driver*", validate_load_option },
+       { EFI_GLOBAL_VARIABLE_GUID, "ConIn", validate_device_path },
+       { EFI_GLOBAL_VARIABLE_GUID, "ConInDev", validate_device_path },
+       { EFI_GLOBAL_VARIABLE_GUID, "ConOut", validate_device_path },
+       { EFI_GLOBAL_VARIABLE_GUID, "ConOutDev", validate_device_path },
+       { EFI_GLOBAL_VARIABLE_GUID, "ErrOut", validate_device_path },
+       { EFI_GLOBAL_VARIABLE_GUID, "ErrOutDev", validate_device_path },
+       { EFI_GLOBAL_VARIABLE_GUID, "Lang", validate_ascii_string },
+       { EFI_GLOBAL_VARIABLE_GUID, "PlatformLang", validate_ascii_string },
+       { EFI_GLOBAL_VARIABLE_GUID, "Timeout", validate_uint16 },
+       { NULL_GUID, "", NULL },
 };
 
 bool
-efivar_validate(efi_char16_t *var_name, u8 *data, unsigned long data_size)
+efivar_validate(efi_guid_t vendor, efi_char16_t *var_name, u8 *data,
+               unsigned long data_size)
 {
        int i;
        unsigned long utf8_size;
@@ -203,9 +214,12 @@ efivar_validate(efi_char16_t *var_name, u8 *data, unsigned long data_size)
        ucs2_as_utf8(utf8_name, var_name, utf8_size);
        utf8_name[utf8_size] = '\0';
 
-       for (i = 0; variable_validate[i].validate != NULL; i++) {
+       for (i = 0; variable_validate[i].name[0] != '\0'; i++) {
                const char *name = variable_validate[i].name;
-               int match;
+               int match = 0;
+
+               if (efi_guidcmp(vendor, variable_validate[i].vendor))
+                       continue;
 
                for (match = 0; ; match++) {
                        char c = name[match];
@@ -862,7 +876,7 @@ int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
 
        *set = false;
 
-       if (efivar_validate(name, data, *size) == false)
+       if (efivar_validate(*vendor, name, data, *size) == false)
                return -EINVAL;
 
        /*

diff --git a/include/linux/efi.h b/include/linux/efi.h
index 569b5a866bb1e6308bbc4c0a28a2da92d106d6b5..16ca611aabc8f9d756b83b9f73f1c27b9d935d7e 100644 (file)
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1199,7 +1199,8 @@ int efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
 struct efivar_entry *efivar_entry_find(efi_char16_t *name, efi_guid_t guid,
                                       struct list_head *head, bool remove);
 
-bool efivar_validate(efi_char16_t *var_name, u8 *data, unsigned long len);
+bool efivar_validate(efi_guid_t vendor, efi_char16_t *var_name, u8 *data,
+                    unsigned long data_size);
 
 extern struct work_struct efivar_work;
 void efivar_run_worker(void);