efi: Make our variable validation list include the guid

commit 8282f5d9c17fe15a9e658c06e3f343efae1a2a2f upstream.

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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c
index b4d5eeb78ffdf34bbd164e8c545e9c3f5fbe84ef..d363009f8feb23c6df0b76feda96c2994c9f3887 100644 (file)
--- a/drivers/firmware/efi/efivars.c
+++ b/drivers/firmware/efi/efivars.c
@@ -219,7 +219,8 @@ efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
        }
 
        if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 ||
-           efivar_validate(new_var->VariableName, new_var->Data, new_var->DataSize) == false) {
+           efivar_validate(new_var->VendorGuid, new_var->VariableName,
+                           new_var->Data, new_var->DataSize) == false) {
                printk(KERN_ERR "efivars: Malformed variable content\n");
                return -EINVAL;
        }
@@ -334,7 +335,8 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
                return -EACCES;
 
        if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 ||
-           efivar_validate(new_var->VariableName, new_var->Data, new_var->DataSize) == false) {
+           efivar_validate(new_var->VendorGuid, new_var->VariableName,
+                           new_var->Data, new_var->DataSize) == 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 aad48b99553fcf257463166a21fcd7dc028cbb1d..ce0ead43f7e147c923316ba50a0e6a5dc5d96f33 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];
@@ -815,7 +829,7 @@ 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 68a4410fc9e6fda070d446b130c29fc6245f1b1b..49582e8a4680840ff258518a3e04a278d5b5fb6f 100644 (file)
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -836,7 +836,8 @@ 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);