671 lines
16 KiB
C
671 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Originally from efivars.c,
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*
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* Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com>
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* Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com>
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*
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* This code takes all variables accessible from EFI runtime and
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* exports them via sysfs
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*/
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#include <linux/efi.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/ucs2_string.h>
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#include <linux/compat.h>
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#define EFIVARS_VERSION "0.08"
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#define EFIVARS_DATE "2004-May-17"
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MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>");
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MODULE_DESCRIPTION("sysfs interface to EFI Variables");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(EFIVARS_VERSION);
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static LIST_HEAD(efivar_sysfs_list);
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static struct kset *efivars_kset;
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static struct bin_attribute *efivars_new_var;
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static struct bin_attribute *efivars_del_var;
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struct compat_efi_variable {
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efi_char16_t VariableName[EFI_VAR_NAME_LEN/sizeof(efi_char16_t)];
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efi_guid_t VendorGuid;
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__u32 DataSize;
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__u8 Data[1024];
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__u32 Status;
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__u32 Attributes;
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} __packed;
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struct efivar_attribute {
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struct attribute attr;
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ssize_t (*show) (struct efivar_entry *entry, char *buf);
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ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count);
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};
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#define EFIVAR_ATTR(_name, _mode, _show, _store) \
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struct efivar_attribute efivar_attr_##_name = { \
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.attr = {.name = __stringify(_name), .mode = _mode}, \
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.show = _show, \
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.store = _store, \
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};
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#define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr)
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#define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj)
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/*
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* Prototype for sysfs creation function
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*/
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static int
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efivar_create_sysfs_entry(struct efivar_entry *new_var);
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static ssize_t
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efivar_guid_read(struct efivar_entry *entry, char *buf)
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{
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struct efi_variable *var = &entry->var;
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char *str = buf;
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if (!entry || !buf)
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return 0;
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efi_guid_to_str(&var->VendorGuid, str);
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str += strlen(str);
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str += sprintf(str, "\n");
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return str - buf;
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}
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static ssize_t
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efivar_attr_read(struct efivar_entry *entry, char *buf)
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{
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struct efi_variable *var = &entry->var;
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unsigned long size = sizeof(var->Data);
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char *str = buf;
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int ret;
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if (!entry || !buf)
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return -EINVAL;
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ret = efivar_entry_get(entry, &var->Attributes, &size, var->Data);
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var->DataSize = size;
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if (ret)
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return -EIO;
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if (var->Attributes & EFI_VARIABLE_NON_VOLATILE)
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str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n");
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if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS)
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str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n");
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if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS)
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str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n");
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if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD)
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str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n");
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if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS)
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str += sprintf(str,
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"EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n");
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if (var->Attributes &
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EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS)
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str += sprintf(str,
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"EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n");
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if (var->Attributes & EFI_VARIABLE_APPEND_WRITE)
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str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n");
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return str - buf;
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}
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static ssize_t
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efivar_size_read(struct efivar_entry *entry, char *buf)
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{
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struct efi_variable *var = &entry->var;
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unsigned long size = sizeof(var->Data);
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char *str = buf;
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int ret;
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if (!entry || !buf)
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return -EINVAL;
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ret = efivar_entry_get(entry, &var->Attributes, &size, var->Data);
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var->DataSize = size;
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if (ret)
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return -EIO;
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str += sprintf(str, "0x%lx\n", var->DataSize);
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return str - buf;
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}
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static ssize_t
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efivar_data_read(struct efivar_entry *entry, char *buf)
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{
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struct efi_variable *var = &entry->var;
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unsigned long size = sizeof(var->Data);
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int ret;
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if (!entry || !buf)
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return -EINVAL;
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ret = efivar_entry_get(entry, &var->Attributes, &size, var->Data);
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var->DataSize = size;
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if (ret)
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return -EIO;
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memcpy(buf, var->Data, var->DataSize);
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return var->DataSize;
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}
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static inline int
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sanity_check(struct efi_variable *var, efi_char16_t *name, efi_guid_t vendor,
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unsigned long size, u32 attributes, u8 *data)
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{
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/*
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* If only updating the variable data, then the name
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* and guid should remain the same
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*/
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if (memcmp(name, var->VariableName, sizeof(var->VariableName)) ||
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efi_guidcmp(vendor, var->VendorGuid)) {
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printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n");
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return -EINVAL;
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}
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if ((size <= 0) || (attributes == 0)){
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printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n");
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return -EINVAL;
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}
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if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
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efivar_validate(vendor, name, data, size) == false) {
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printk(KERN_ERR "efivars: Malformed variable content\n");
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return -EINVAL;
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}
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return 0;
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}
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static void
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copy_out_compat(struct efi_variable *dst, struct compat_efi_variable *src)
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{
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memcpy(dst->VariableName, src->VariableName, EFI_VAR_NAME_LEN);
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memcpy(dst->Data, src->Data, sizeof(src->Data));
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dst->VendorGuid = src->VendorGuid;
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dst->DataSize = src->DataSize;
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dst->Attributes = src->Attributes;
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}
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/*
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* We allow each variable to be edited via rewriting the
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* entire efi variable structure.
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*/
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static ssize_t
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efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
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{
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struct efi_variable *new_var, *var = &entry->var;
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efi_char16_t *name;
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unsigned long size;
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efi_guid_t vendor;
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u32 attributes;
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u8 *data;
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int err;
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if (!entry || !buf)
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return -EINVAL;
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if (in_compat_syscall()) {
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struct compat_efi_variable *compat;
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if (count != sizeof(*compat))
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return -EINVAL;
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compat = (struct compat_efi_variable *)buf;
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attributes = compat->Attributes;
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vendor = compat->VendorGuid;
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name = compat->VariableName;
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size = compat->DataSize;
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data = compat->Data;
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err = sanity_check(var, name, vendor, size, attributes, data);
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if (err)
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return err;
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copy_out_compat(&entry->var, compat);
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} else {
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if (count != sizeof(struct efi_variable))
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return -EINVAL;
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new_var = (struct efi_variable *)buf;
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attributes = new_var->Attributes;
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vendor = new_var->VendorGuid;
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name = new_var->VariableName;
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size = new_var->DataSize;
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data = new_var->Data;
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err = sanity_check(var, name, vendor, size, attributes, data);
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if (err)
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return err;
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memcpy(&entry->var, new_var, count);
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}
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err = efivar_entry_set(entry, attributes, size, data, NULL);
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if (err) {
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printk(KERN_WARNING "efivars: set_variable() failed: status=%d\n", err);
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return -EIO;
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}
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return count;
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}
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static ssize_t
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efivar_show_raw(struct efivar_entry *entry, char *buf)
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{
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struct efi_variable *var = &entry->var;
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struct compat_efi_variable *compat;
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unsigned long datasize = sizeof(var->Data);
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size_t size;
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int ret;
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if (!entry || !buf)
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return 0;
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ret = efivar_entry_get(entry, &var->Attributes, &datasize, var->Data);
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var->DataSize = datasize;
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if (ret)
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return -EIO;
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if (in_compat_syscall()) {
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compat = (struct compat_efi_variable *)buf;
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size = sizeof(*compat);
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memcpy(compat->VariableName, var->VariableName,
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EFI_VAR_NAME_LEN);
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memcpy(compat->Data, var->Data, sizeof(compat->Data));
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compat->VendorGuid = var->VendorGuid;
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compat->DataSize = var->DataSize;
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compat->Attributes = var->Attributes;
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} else {
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size = sizeof(*var);
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memcpy(buf, var, size);
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}
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return size;
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}
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/*
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* Generic read/write functions that call the specific functions of
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* the attributes...
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*/
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static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr,
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char *buf)
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{
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struct efivar_entry *var = to_efivar_entry(kobj);
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struct efivar_attribute *efivar_attr = to_efivar_attr(attr);
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ssize_t ret = -EIO;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (efivar_attr->show) {
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ret = efivar_attr->show(var, buf);
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}
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return ret;
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}
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static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr,
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const char *buf, size_t count)
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{
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struct efivar_entry *var = to_efivar_entry(kobj);
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struct efivar_attribute *efivar_attr = to_efivar_attr(attr);
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ssize_t ret = -EIO;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (efivar_attr->store)
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ret = efivar_attr->store(var, buf, count);
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return ret;
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}
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static const struct sysfs_ops efivar_attr_ops = {
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.show = efivar_attr_show,
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.store = efivar_attr_store,
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};
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static void efivar_release(struct kobject *kobj)
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{
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struct efivar_entry *var = to_efivar_entry(kobj);
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kfree(var);
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}
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static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL);
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static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL);
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static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL);
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static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL);
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static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw);
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static struct attribute *def_attrs[] = {
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&efivar_attr_guid.attr,
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&efivar_attr_size.attr,
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&efivar_attr_attributes.attr,
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&efivar_attr_data.attr,
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&efivar_attr_raw_var.attr,
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NULL,
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};
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static struct kobj_type efivar_ktype = {
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.release = efivar_release,
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.sysfs_ops = &efivar_attr_ops,
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.default_attrs = def_attrs,
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};
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static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t pos, size_t count)
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{
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struct compat_efi_variable *compat = (struct compat_efi_variable *)buf;
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struct efi_variable *new_var = (struct efi_variable *)buf;
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struct efivar_entry *new_entry;
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bool need_compat = in_compat_syscall();
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efi_char16_t *name;
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unsigned long size;
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u32 attributes;
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u8 *data;
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int err;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (need_compat) {
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if (count != sizeof(*compat))
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return -EINVAL;
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attributes = compat->Attributes;
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name = compat->VariableName;
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size = compat->DataSize;
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data = compat->Data;
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} else {
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if (count != sizeof(*new_var))
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return -EINVAL;
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attributes = new_var->Attributes;
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name = new_var->VariableName;
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size = new_var->DataSize;
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data = new_var->Data;
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}
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if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
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efivar_validate(new_var->VendorGuid, name, data,
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size) == false) {
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printk(KERN_ERR "efivars: Malformed variable content\n");
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return -EINVAL;
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}
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new_entry = kzalloc(sizeof(*new_entry), GFP_KERNEL);
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if (!new_entry)
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return -ENOMEM;
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if (need_compat)
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copy_out_compat(&new_entry->var, compat);
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else
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memcpy(&new_entry->var, new_var, sizeof(*new_var));
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err = efivar_entry_set(new_entry, attributes, size,
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data, &efivar_sysfs_list);
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if (err) {
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if (err == -EEXIST)
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err = -EINVAL;
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goto out;
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}
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if (efivar_create_sysfs_entry(new_entry)) {
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printk(KERN_WARNING "efivars: failed to create sysfs entry.\n");
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kfree(new_entry);
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}
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return count;
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out:
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kfree(new_entry);
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return err;
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}
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static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t pos, size_t count)
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{
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struct efi_variable *del_var = (struct efi_variable *)buf;
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struct compat_efi_variable *compat;
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struct efivar_entry *entry;
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efi_char16_t *name;
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efi_guid_t vendor;
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int err = 0;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (in_compat_syscall()) {
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if (count != sizeof(*compat))
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return -EINVAL;
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compat = (struct compat_efi_variable *)buf;
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name = compat->VariableName;
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vendor = compat->VendorGuid;
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} else {
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if (count != sizeof(*del_var))
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return -EINVAL;
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name = del_var->VariableName;
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vendor = del_var->VendorGuid;
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}
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if (efivar_entry_iter_begin())
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return -EINTR;
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entry = efivar_entry_find(name, vendor, &efivar_sysfs_list, true);
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if (!entry)
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err = -EINVAL;
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else if (__efivar_entry_delete(entry))
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err = -EIO;
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if (err) {
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efivar_entry_iter_end();
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return err;
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}
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if (!entry->scanning) {
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efivar_entry_iter_end();
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efivar_unregister(entry);
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} else
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efivar_entry_iter_end();
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/* It's dead Jim.... */
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return count;
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}
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/**
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* efivar_create_sysfs_entry - create a new entry in sysfs
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* @new_var: efivar entry to create
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*
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* Returns 0 on success, negative error code on failure
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*/
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static int
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efivar_create_sysfs_entry(struct efivar_entry *new_var)
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{
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int short_name_size;
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char *short_name;
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unsigned long utf8_name_size;
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efi_char16_t *variable_name = new_var->var.VariableName;
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int ret;
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/*
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* Length of the variable bytes in UTF8, plus the '-' separator,
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* plus the GUID, plus trailing NUL
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*/
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utf8_name_size = ucs2_utf8size(variable_name);
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short_name_size = utf8_name_size + 1 + EFI_VARIABLE_GUID_LEN + 1;
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short_name = kmalloc(short_name_size, GFP_KERNEL);
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if (!short_name)
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return -ENOMEM;
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ucs2_as_utf8(short_name, variable_name, short_name_size);
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/* This is ugly, but necessary to separate one vendor's
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private variables from another's. */
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short_name[utf8_name_size] = '-';
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efi_guid_to_str(&new_var->var.VendorGuid,
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short_name + utf8_name_size + 1);
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new_var->kobj.kset = efivars_kset;
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ret = kobject_init_and_add(&new_var->kobj, &efivar_ktype,
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NULL, "%s", short_name);
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kfree(short_name);
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if (ret) {
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kobject_put(&new_var->kobj);
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|
return ret;
|
|
}
|
|
|
|
kobject_uevent(&new_var->kobj, KOBJ_ADD);
|
|
if (efivar_entry_add(new_var, &efivar_sysfs_list)) {
|
|
efivar_unregister(new_var);
|
|
return -EINTR;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
create_efivars_bin_attributes(void)
|
|
{
|
|
struct bin_attribute *attr;
|
|
int error;
|
|
|
|
/* new_var */
|
|
attr = kzalloc(sizeof(*attr), GFP_KERNEL);
|
|
if (!attr)
|
|
return -ENOMEM;
|
|
|
|
attr->attr.name = "new_var";
|
|
attr->attr.mode = 0200;
|
|
attr->write = efivar_create;
|
|
efivars_new_var = attr;
|
|
|
|
/* del_var */
|
|
attr = kzalloc(sizeof(*attr), GFP_KERNEL);
|
|
if (!attr) {
|
|
error = -ENOMEM;
|
|
goto out_free;
|
|
}
|
|
attr->attr.name = "del_var";
|
|
attr->attr.mode = 0200;
|
|
attr->write = efivar_delete;
|
|
efivars_del_var = attr;
|
|
|
|
sysfs_bin_attr_init(efivars_new_var);
|
|
sysfs_bin_attr_init(efivars_del_var);
|
|
|
|
/* Register */
|
|
error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_new_var);
|
|
if (error) {
|
|
printk(KERN_ERR "efivars: unable to create new_var sysfs file"
|
|
" due to error %d\n", error);
|
|
goto out_free;
|
|
}
|
|
|
|
error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_del_var);
|
|
if (error) {
|
|
printk(KERN_ERR "efivars: unable to create del_var sysfs file"
|
|
" due to error %d\n", error);
|
|
sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var);
|
|
goto out_free;
|
|
}
|
|
|
|
return 0;
|
|
out_free:
|
|
kfree(efivars_del_var);
|
|
efivars_del_var = NULL;
|
|
kfree(efivars_new_var);
|
|
efivars_new_var = NULL;
|
|
return error;
|
|
}
|
|
|
|
static int efivars_sysfs_callback(efi_char16_t *name, efi_guid_t vendor,
|
|
unsigned long name_size, void *data)
|
|
{
|
|
struct efivar_entry *entry;
|
|
|
|
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
|
|
if (!entry)
|
|
return -ENOMEM;
|
|
|
|
memcpy(entry->var.VariableName, name, name_size);
|
|
memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t));
|
|
|
|
efivar_create_sysfs_entry(entry);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int efivar_sysfs_destroy(struct efivar_entry *entry, void *data)
|
|
{
|
|
int err = efivar_entry_remove(entry);
|
|
|
|
if (err)
|
|
return err;
|
|
efivar_unregister(entry);
|
|
return 0;
|
|
}
|
|
|
|
static void efivars_sysfs_exit(void)
|
|
{
|
|
/* Remove all entries and destroy */
|
|
int err;
|
|
|
|
err = __efivar_entry_iter(efivar_sysfs_destroy, &efivar_sysfs_list,
|
|
NULL, NULL);
|
|
if (err) {
|
|
pr_err("efivars: Failed to destroy sysfs entries\n");
|
|
return;
|
|
}
|
|
|
|
if (efivars_new_var)
|
|
sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var);
|
|
if (efivars_del_var)
|
|
sysfs_remove_bin_file(&efivars_kset->kobj, efivars_del_var);
|
|
kfree(efivars_new_var);
|
|
kfree(efivars_del_var);
|
|
kset_unregister(efivars_kset);
|
|
}
|
|
|
|
static int efivars_sysfs_init(void)
|
|
{
|
|
struct kobject *parent_kobj = efivars_kobject();
|
|
int error = 0;
|
|
|
|
/* No efivars has been registered yet */
|
|
if (!parent_kobj || !efivar_supports_writes())
|
|
return 0;
|
|
|
|
printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION,
|
|
EFIVARS_DATE);
|
|
|
|
efivars_kset = kset_create_and_add("vars", NULL, parent_kobj);
|
|
if (!efivars_kset) {
|
|
printk(KERN_ERR "efivars: Subsystem registration failed.\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
efivar_init(efivars_sysfs_callback, NULL, true, &efivar_sysfs_list);
|
|
|
|
error = create_efivars_bin_attributes();
|
|
if (error) {
|
|
efivars_sysfs_exit();
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
module_init(efivars_sysfs_init);
|
|
module_exit(efivars_sysfs_exit);
|