mirror of
https://github.com/edk2-porting/linux-next.git
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f88814cc25
Commitbf67fad19e
("efi: Use more granular check for availability for variable services") introduced a check into the efivarfs, efi-pstore and other drivers that aborts loading of the module if not all three variable runtime services (GetVariable, SetVariable and GetNextVariable) are supported. However, this results in efivarfs being unavailable entirely if only SetVariable support is missing, which is only needed if you want to make any modifications. Also, efi-pstore and the sysfs EFI variable interface could be backed by another implementation of the 'efivars' abstraction, in which case it is completely irrelevant which services are supported by the EFI firmware. So make the generic 'efivars' abstraction dependent on the availibility of the GetVariable and GetNextVariable EFI runtime services, and add a helper 'efivar_supports_writes()' to find out whether the currently active efivars abstraction supports writes (and wire it up to the availability of SetVariable for the generic one). Then, use the efivar_supports_writes() helper to decide whether to permit efivarfs to be mounted read-write, and whether to enable efi-pstore or the sysfs EFI variable interface altogether. Fixes:bf67fad19e
("efi: Use more granular check for availability for variable services") Reported-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Tested-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
1238 lines
31 KiB
C
1238 lines
31 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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#include <linux/capability.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/smp.h>
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#include <linux/efi.h>
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#include <linux/sysfs.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/ctype.h>
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#include <linux/ucs2_string.h>
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/* Private pointer to registered efivars */
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static struct efivars *__efivars;
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/*
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* efivars_lock protects three things:
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* 1) efivarfs_list and efivars_sysfs_list
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* 2) ->ops calls
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* 3) (un)registration of __efivars
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*/
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static DEFINE_SEMAPHORE(efivars_lock);
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static bool efivar_wq_enabled = true;
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DECLARE_WORK(efivar_work, NULL);
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EXPORT_SYMBOL_GPL(efivar_work);
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static bool
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validate_device_path(efi_char16_t *var_name, int match, u8 *buffer,
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unsigned long len)
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{
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struct efi_generic_dev_path *node;
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int offset = 0;
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node = (struct efi_generic_dev_path *)buffer;
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if (len < sizeof(*node))
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return false;
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while (offset <= len - sizeof(*node) &&
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node->length >= sizeof(*node) &&
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node->length <= len - offset) {
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offset += node->length;
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if ((node->type == EFI_DEV_END_PATH ||
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node->type == EFI_DEV_END_PATH2) &&
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node->sub_type == EFI_DEV_END_ENTIRE)
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return true;
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node = (struct efi_generic_dev_path *)(buffer + offset);
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}
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/*
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* If we're here then either node->length pointed past the end
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* of the buffer or we reached the end of the buffer without
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* finding a device path end node.
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*/
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return false;
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}
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static bool
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validate_boot_order(efi_char16_t *var_name, int match, u8 *buffer,
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unsigned long len)
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{
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/* An array of 16-bit integers */
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if ((len % 2) != 0)
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return false;
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return true;
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}
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static bool
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validate_load_option(efi_char16_t *var_name, int match, u8 *buffer,
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unsigned long len)
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{
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u16 filepathlength;
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int i, desclength = 0, namelen;
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namelen = ucs2_strnlen(var_name, EFI_VAR_NAME_LEN);
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/* Either "Boot" or "Driver" followed by four digits of hex */
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for (i = match; i < match+4; i++) {
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if (var_name[i] > 127 ||
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hex_to_bin(var_name[i] & 0xff) < 0)
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return true;
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}
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/* Reject it if there's 4 digits of hex and then further content */
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if (namelen > match + 4)
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return false;
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/* A valid entry must be at least 8 bytes */
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if (len < 8)
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return false;
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filepathlength = buffer[4] | buffer[5] << 8;
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/*
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* There's no stored length for the description, so it has to be
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* found by hand
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*/
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desclength = ucs2_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2;
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/* Each boot entry must have a descriptor */
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if (!desclength)
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return false;
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/*
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* If the sum of the length of the description, the claimed filepath
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* length and the original header are greater than the length of the
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* variable, it's malformed
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*/
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if ((desclength + filepathlength + 6) > len)
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return false;
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/*
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* And, finally, check the filepath
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*/
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return validate_device_path(var_name, match, buffer + desclength + 6,
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filepathlength);
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}
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static bool
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validate_uint16(efi_char16_t *var_name, int match, u8 *buffer,
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unsigned long len)
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{
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/* A single 16-bit integer */
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if (len != 2)
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return false;
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return true;
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}
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static bool
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validate_ascii_string(efi_char16_t *var_name, int match, u8 *buffer,
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unsigned long len)
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{
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int i;
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for (i = 0; i < len; i++) {
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if (buffer[i] > 127)
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return false;
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if (buffer[i] == 0)
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return true;
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}
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return false;
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}
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struct variable_validate {
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efi_guid_t vendor;
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char *name;
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bool (*validate)(efi_char16_t *var_name, int match, u8 *data,
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unsigned long len);
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};
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/*
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* This is the list of variables we need to validate, as well as the
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* whitelist for what we think is safe not to default to immutable.
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*
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* If it has a validate() method that's not NULL, it'll go into the
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* validation routine. If not, it is assumed valid, but still used for
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* whitelisting.
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*
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* Note that it's sorted by {vendor,name}, but globbed names must come after
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* any other name with the same prefix.
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*/
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static const struct variable_validate variable_validate[] = {
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{ EFI_GLOBAL_VARIABLE_GUID, "BootNext", validate_uint16 },
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{ EFI_GLOBAL_VARIABLE_GUID, "BootOrder", validate_boot_order },
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{ EFI_GLOBAL_VARIABLE_GUID, "Boot*", validate_load_option },
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{ EFI_GLOBAL_VARIABLE_GUID, "DriverOrder", validate_boot_order },
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{ EFI_GLOBAL_VARIABLE_GUID, "Driver*", validate_load_option },
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{ EFI_GLOBAL_VARIABLE_GUID, "ConIn", validate_device_path },
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{ EFI_GLOBAL_VARIABLE_GUID, "ConInDev", validate_device_path },
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{ EFI_GLOBAL_VARIABLE_GUID, "ConOut", validate_device_path },
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{ EFI_GLOBAL_VARIABLE_GUID, "ConOutDev", validate_device_path },
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{ EFI_GLOBAL_VARIABLE_GUID, "ErrOut", validate_device_path },
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{ EFI_GLOBAL_VARIABLE_GUID, "ErrOutDev", validate_device_path },
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{ EFI_GLOBAL_VARIABLE_GUID, "Lang", validate_ascii_string },
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{ EFI_GLOBAL_VARIABLE_GUID, "OsIndications", NULL },
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{ EFI_GLOBAL_VARIABLE_GUID, "PlatformLang", validate_ascii_string },
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{ EFI_GLOBAL_VARIABLE_GUID, "Timeout", validate_uint16 },
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{ LINUX_EFI_CRASH_GUID, "*", NULL },
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{ NULL_GUID, "", NULL },
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};
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/*
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* Check if @var_name matches the pattern given in @match_name.
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*
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* @var_name: an array of @len non-NUL characters.
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* @match_name: a NUL-terminated pattern string, optionally ending in "*". A
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* final "*" character matches any trailing characters @var_name,
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* including the case when there are none left in @var_name.
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* @match: on output, the number of non-wildcard characters in @match_name
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* that @var_name matches, regardless of the return value.
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* @return: whether @var_name fully matches @match_name.
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*/
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static bool
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variable_matches(const char *var_name, size_t len, const char *match_name,
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int *match)
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{
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for (*match = 0; ; (*match)++) {
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char c = match_name[*match];
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switch (c) {
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case '*':
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/* Wildcard in @match_name means we've matched. */
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return true;
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case '\0':
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/* @match_name has ended. Has @var_name too? */
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return (*match == len);
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default:
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/*
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* We've reached a non-wildcard char in @match_name.
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* Continue only if there's an identical character in
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* @var_name.
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*/
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if (*match < len && c == var_name[*match])
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continue;
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return false;
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}
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}
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}
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bool
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efivar_validate(efi_guid_t vendor, efi_char16_t *var_name, u8 *data,
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unsigned long data_size)
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{
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int i;
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unsigned long utf8_size;
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u8 *utf8_name;
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utf8_size = ucs2_utf8size(var_name);
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utf8_name = kmalloc(utf8_size + 1, GFP_KERNEL);
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if (!utf8_name)
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return false;
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ucs2_as_utf8(utf8_name, var_name, utf8_size);
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utf8_name[utf8_size] = '\0';
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for (i = 0; variable_validate[i].name[0] != '\0'; i++) {
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const char *name = variable_validate[i].name;
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int match = 0;
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if (efi_guidcmp(vendor, variable_validate[i].vendor))
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continue;
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if (variable_matches(utf8_name, utf8_size+1, name, &match)) {
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if (variable_validate[i].validate == NULL)
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break;
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kfree(utf8_name);
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return variable_validate[i].validate(var_name, match,
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data, data_size);
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}
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}
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kfree(utf8_name);
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return true;
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}
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EXPORT_SYMBOL_GPL(efivar_validate);
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bool
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efivar_variable_is_removable(efi_guid_t vendor, const char *var_name,
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size_t len)
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{
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int i;
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bool found = false;
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int match = 0;
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/*
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* Check if our variable is in the validated variables list
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*/
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for (i = 0; variable_validate[i].name[0] != '\0'; i++) {
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if (efi_guidcmp(variable_validate[i].vendor, vendor))
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continue;
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if (variable_matches(var_name, len,
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variable_validate[i].name, &match)) {
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found = true;
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break;
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}
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}
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/*
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* If it's in our list, it is removable.
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*/
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return found;
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}
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EXPORT_SYMBOL_GPL(efivar_variable_is_removable);
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static efi_status_t
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check_var_size(u32 attributes, unsigned long size)
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{
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const struct efivar_operations *fops;
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if (!__efivars)
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return EFI_UNSUPPORTED;
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fops = __efivars->ops;
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if (!fops->query_variable_store)
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return EFI_UNSUPPORTED;
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return fops->query_variable_store(attributes, size, false);
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}
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static efi_status_t
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check_var_size_nonblocking(u32 attributes, unsigned long size)
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{
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const struct efivar_operations *fops;
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if (!__efivars)
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return EFI_UNSUPPORTED;
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fops = __efivars->ops;
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if (!fops->query_variable_store)
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return EFI_UNSUPPORTED;
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return fops->query_variable_store(attributes, size, true);
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}
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static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor,
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struct list_head *head)
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{
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struct efivar_entry *entry, *n;
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unsigned long strsize1, strsize2;
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bool found = false;
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strsize1 = ucs2_strsize(variable_name, 1024);
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list_for_each_entry_safe(entry, n, head, list) {
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strsize2 = ucs2_strsize(entry->var.VariableName, 1024);
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if (strsize1 == strsize2 &&
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!memcmp(variable_name, &(entry->var.VariableName),
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strsize2) &&
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!efi_guidcmp(entry->var.VendorGuid,
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*vendor)) {
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found = true;
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break;
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}
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}
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return found;
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}
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/*
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* Returns the size of variable_name, in bytes, including the
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* terminating NULL character, or variable_name_size if no NULL
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* character is found among the first variable_name_size bytes.
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*/
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static unsigned long var_name_strnsize(efi_char16_t *variable_name,
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unsigned long variable_name_size)
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{
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unsigned long len;
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efi_char16_t c;
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/*
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* The variable name is, by definition, a NULL-terminated
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* string, so make absolutely sure that variable_name_size is
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* the value we expect it to be. If not, return the real size.
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*/
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for (len = 2; len <= variable_name_size; len += sizeof(c)) {
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c = variable_name[(len / sizeof(c)) - 1];
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if (!c)
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break;
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}
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return min(len, variable_name_size);
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}
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/*
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* Print a warning when duplicate EFI variables are encountered and
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* disable the sysfs workqueue since the firmware is buggy.
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*/
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static void dup_variable_bug(efi_char16_t *str16, efi_guid_t *vendor_guid,
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unsigned long len16)
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{
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size_t i, len8 = len16 / sizeof(efi_char16_t);
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char *str8;
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/*
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* Disable the workqueue since the algorithm it uses for
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* detecting new variables won't work with this buggy
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* implementation of GetNextVariableName().
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*/
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efivar_wq_enabled = false;
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str8 = kzalloc(len8, GFP_KERNEL);
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if (!str8)
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return;
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for (i = 0; i < len8; i++)
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str8[i] = str16[i];
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printk(KERN_WARNING "efivars: duplicate variable: %s-%pUl\n",
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str8, vendor_guid);
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kfree(str8);
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}
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/**
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* efivar_init - build the initial list of EFI variables
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* @func: callback function to invoke for every variable
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* @data: function-specific data to pass to @func
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* @atomic: do we need to execute the @func-loop atomically?
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* @duplicates: error if we encounter duplicates on @head?
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* @head: initialised head of variable list
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*
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* Get every EFI variable from the firmware and invoke @func. @func
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* should call efivar_entry_add() to build the list of variables.
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*
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* Returns 0 on success, or a kernel error code on failure.
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*/
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int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
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void *data, bool duplicates, struct list_head *head)
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{
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const struct efivar_operations *ops;
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unsigned long variable_name_size = 1024;
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efi_char16_t *variable_name;
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efi_status_t status;
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efi_guid_t vendor_guid;
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int err = 0;
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if (!__efivars)
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return -EFAULT;
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ops = __efivars->ops;
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variable_name = kzalloc(variable_name_size, GFP_KERNEL);
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if (!variable_name) {
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printk(KERN_ERR "efivars: Memory allocation failed.\n");
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return -ENOMEM;
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}
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|
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if (down_interruptible(&efivars_lock)) {
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err = -EINTR;
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goto free;
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}
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/*
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* Per EFI spec, the maximum storage allocated for both
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* the variable name and variable data is 1024 bytes.
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*/
|
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do {
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variable_name_size = 1024;
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status = ops->get_next_variable(&variable_name_size,
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variable_name,
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&vendor_guid);
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switch (status) {
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case EFI_SUCCESS:
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if (duplicates)
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up(&efivars_lock);
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|
|
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variable_name_size = var_name_strnsize(variable_name,
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variable_name_size);
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|
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/*
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* Some firmware implementations return the
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* same variable name on multiple calls to
|
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* get_next_variable(). Terminate the loop
|
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* immediately as there is no guarantee that
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* we'll ever see a different variable name,
|
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* and may end up looping here forever.
|
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*/
|
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if (duplicates &&
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variable_is_present(variable_name, &vendor_guid,
|
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head)) {
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dup_variable_bug(variable_name, &vendor_guid,
|
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variable_name_size);
|
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status = EFI_NOT_FOUND;
|
|
} else {
|
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err = func(variable_name, vendor_guid,
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variable_name_size, data);
|
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if (err)
|
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status = EFI_NOT_FOUND;
|
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}
|
|
|
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if (duplicates) {
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if (down_interruptible(&efivars_lock)) {
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err = -EINTR;
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goto free;
|
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}
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}
|
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|
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break;
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case EFI_NOT_FOUND:
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break;
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default:
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printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n",
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|
status);
|
|
status = EFI_NOT_FOUND;
|
|
break;
|
|
}
|
|
|
|
} while (status != EFI_NOT_FOUND);
|
|
|
|
up(&efivars_lock);
|
|
free:
|
|
kfree(variable_name);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivar_init);
|
|
|
|
/**
|
|
* efivar_entry_add - add entry to variable list
|
|
* @entry: entry to add to list
|
|
* @head: list head
|
|
*
|
|
* Returns 0 on success, or a kernel error code on failure.
|
|
*/
|
|
int efivar_entry_add(struct efivar_entry *entry, struct list_head *head)
|
|
{
|
|
if (down_interruptible(&efivars_lock))
|
|
return -EINTR;
|
|
list_add(&entry->list, head);
|
|
up(&efivars_lock);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivar_entry_add);
|
|
|
|
/**
|
|
* efivar_entry_remove - remove entry from variable list
|
|
* @entry: entry to remove from list
|
|
*
|
|
* Returns 0 on success, or a kernel error code on failure.
|
|
*/
|
|
int efivar_entry_remove(struct efivar_entry *entry)
|
|
{
|
|
if (down_interruptible(&efivars_lock))
|
|
return -EINTR;
|
|
list_del(&entry->list);
|
|
up(&efivars_lock);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivar_entry_remove);
|
|
|
|
/*
|
|
* efivar_entry_list_del_unlock - remove entry from variable list
|
|
* @entry: entry to remove
|
|
*
|
|
* Remove @entry from the variable list and release the list lock.
|
|
*
|
|
* NOTE: slightly weird locking semantics here - we expect to be
|
|
* called with the efivars lock already held, and we release it before
|
|
* returning. This is because this function is usually called after
|
|
* set_variable() while the lock is still held.
|
|
*/
|
|
static void efivar_entry_list_del_unlock(struct efivar_entry *entry)
|
|
{
|
|
list_del(&entry->list);
|
|
up(&efivars_lock);
|
|
}
|
|
|
|
/**
|
|
* __efivar_entry_delete - delete an EFI variable
|
|
* @entry: entry containing EFI variable to delete
|
|
*
|
|
* Delete the variable from the firmware but leave @entry on the
|
|
* variable list.
|
|
*
|
|
* This function differs from efivar_entry_delete() because it does
|
|
* not remove @entry from the variable list. Also, it is safe to be
|
|
* called from within a efivar_entry_iter_begin() and
|
|
* efivar_entry_iter_end() region, unlike efivar_entry_delete().
|
|
*
|
|
* Returns 0 on success, or a converted EFI status code if
|
|
* set_variable() fails.
|
|
*/
|
|
int __efivar_entry_delete(struct efivar_entry *entry)
|
|
{
|
|
efi_status_t status;
|
|
|
|
if (!__efivars)
|
|
return -EINVAL;
|
|
|
|
status = __efivars->ops->set_variable(entry->var.VariableName,
|
|
&entry->var.VendorGuid,
|
|
0, 0, NULL);
|
|
|
|
return efi_status_to_err(status);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__efivar_entry_delete);
|
|
|
|
/**
|
|
* efivar_entry_delete - delete variable and remove entry from list
|
|
* @entry: entry containing variable to delete
|
|
*
|
|
* Delete the variable from the firmware and remove @entry from the
|
|
* variable list. It is the caller's responsibility to free @entry
|
|
* once we return.
|
|
*
|
|
* Returns 0 on success, -EINTR if we can't grab the semaphore,
|
|
* converted EFI status code if set_variable() fails.
|
|
*/
|
|
int efivar_entry_delete(struct efivar_entry *entry)
|
|
{
|
|
const struct efivar_operations *ops;
|
|
efi_status_t status;
|
|
|
|
if (down_interruptible(&efivars_lock))
|
|
return -EINTR;
|
|
|
|
if (!__efivars) {
|
|
up(&efivars_lock);
|
|
return -EINVAL;
|
|
}
|
|
ops = __efivars->ops;
|
|
status = ops->set_variable(entry->var.VariableName,
|
|
&entry->var.VendorGuid,
|
|
0, 0, NULL);
|
|
if (!(status == EFI_SUCCESS || status == EFI_NOT_FOUND)) {
|
|
up(&efivars_lock);
|
|
return efi_status_to_err(status);
|
|
}
|
|
|
|
efivar_entry_list_del_unlock(entry);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivar_entry_delete);
|
|
|
|
/**
|
|
* efivar_entry_set - call set_variable()
|
|
* @entry: entry containing the EFI variable to write
|
|
* @attributes: variable attributes
|
|
* @size: size of @data buffer
|
|
* @data: buffer containing variable data
|
|
* @head: head of variable list
|
|
*
|
|
* Calls set_variable() for an EFI variable. If creating a new EFI
|
|
* variable, this function is usually followed by efivar_entry_add().
|
|
*
|
|
* Before writing the variable, the remaining EFI variable storage
|
|
* space is checked to ensure there is enough room available.
|
|
*
|
|
* If @head is not NULL a lookup is performed to determine whether
|
|
* the entry is already on the list.
|
|
*
|
|
* Returns 0 on success, -EINTR if we can't grab the semaphore,
|
|
* -EEXIST if a lookup is performed and the entry already exists on
|
|
* the list, or a converted EFI status code if set_variable() fails.
|
|
*/
|
|
int efivar_entry_set(struct efivar_entry *entry, u32 attributes,
|
|
unsigned long size, void *data, struct list_head *head)
|
|
{
|
|
const struct efivar_operations *ops;
|
|
efi_status_t status;
|
|
efi_char16_t *name = entry->var.VariableName;
|
|
efi_guid_t vendor = entry->var.VendorGuid;
|
|
|
|
if (down_interruptible(&efivars_lock))
|
|
return -EINTR;
|
|
|
|
if (!__efivars) {
|
|
up(&efivars_lock);
|
|
return -EINVAL;
|
|
}
|
|
ops = __efivars->ops;
|
|
if (head && efivar_entry_find(name, vendor, head, false)) {
|
|
up(&efivars_lock);
|
|
return -EEXIST;
|
|
}
|
|
|
|
status = check_var_size(attributes, size + ucs2_strsize(name, 1024));
|
|
if (status == EFI_SUCCESS || status == EFI_UNSUPPORTED)
|
|
status = ops->set_variable(name, &vendor,
|
|
attributes, size, data);
|
|
|
|
up(&efivars_lock);
|
|
|
|
return efi_status_to_err(status);
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivar_entry_set);
|
|
|
|
/*
|
|
* efivar_entry_set_nonblocking - call set_variable_nonblocking()
|
|
*
|
|
* This function is guaranteed to not block and is suitable for calling
|
|
* from crash/panic handlers.
|
|
*
|
|
* Crucially, this function will not block if it cannot acquire
|
|
* efivars_lock. Instead, it returns -EBUSY.
|
|
*/
|
|
static int
|
|
efivar_entry_set_nonblocking(efi_char16_t *name, efi_guid_t vendor,
|
|
u32 attributes, unsigned long size, void *data)
|
|
{
|
|
const struct efivar_operations *ops;
|
|
efi_status_t status;
|
|
|
|
if (down_trylock(&efivars_lock))
|
|
return -EBUSY;
|
|
|
|
if (!__efivars) {
|
|
up(&efivars_lock);
|
|
return -EINVAL;
|
|
}
|
|
|
|
status = check_var_size_nonblocking(attributes,
|
|
size + ucs2_strsize(name, 1024));
|
|
if (status != EFI_SUCCESS) {
|
|
up(&efivars_lock);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
ops = __efivars->ops;
|
|
status = ops->set_variable_nonblocking(name, &vendor, attributes,
|
|
size, data);
|
|
|
|
up(&efivars_lock);
|
|
return efi_status_to_err(status);
|
|
}
|
|
|
|
/**
|
|
* efivar_entry_set_safe - call set_variable() if enough space in firmware
|
|
* @name: buffer containing the variable name
|
|
* @vendor: variable vendor guid
|
|
* @attributes: variable attributes
|
|
* @block: can we block in this context?
|
|
* @size: size of @data buffer
|
|
* @data: buffer containing variable data
|
|
*
|
|
* Ensures there is enough free storage in the firmware for this variable, and
|
|
* if so, calls set_variable(). If creating a new EFI variable, this function
|
|
* is usually followed by efivar_entry_add().
|
|
*
|
|
* Returns 0 on success, -ENOSPC if the firmware does not have enough
|
|
* space for set_variable() to succeed, or a converted EFI status code
|
|
* if set_variable() fails.
|
|
*/
|
|
int efivar_entry_set_safe(efi_char16_t *name, efi_guid_t vendor, u32 attributes,
|
|
bool block, unsigned long size, void *data)
|
|
{
|
|
const struct efivar_operations *ops;
|
|
efi_status_t status;
|
|
|
|
if (!__efivars)
|
|
return -EINVAL;
|
|
|
|
ops = __efivars->ops;
|
|
if (!ops->query_variable_store)
|
|
return -ENOSYS;
|
|
|
|
/*
|
|
* If the EFI variable backend provides a non-blocking
|
|
* ->set_variable() operation and we're in a context where we
|
|
* cannot block, then we need to use it to avoid live-locks,
|
|
* since the implication is that the regular ->set_variable()
|
|
* will block.
|
|
*
|
|
* If no ->set_variable_nonblocking() is provided then
|
|
* ->set_variable() is assumed to be non-blocking.
|
|
*/
|
|
if (!block && ops->set_variable_nonblocking)
|
|
return efivar_entry_set_nonblocking(name, vendor, attributes,
|
|
size, data);
|
|
|
|
if (!block) {
|
|
if (down_trylock(&efivars_lock))
|
|
return -EBUSY;
|
|
} else {
|
|
if (down_interruptible(&efivars_lock))
|
|
return -EINTR;
|
|
}
|
|
|
|
status = check_var_size(attributes, size + ucs2_strsize(name, 1024));
|
|
if (status != EFI_SUCCESS) {
|
|
up(&efivars_lock);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
status = ops->set_variable(name, &vendor, attributes, size, data);
|
|
|
|
up(&efivars_lock);
|
|
|
|
return efi_status_to_err(status);
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivar_entry_set_safe);
|
|
|
|
/**
|
|
* efivar_entry_find - search for an entry
|
|
* @name: the EFI variable name
|
|
* @guid: the EFI variable vendor's guid
|
|
* @head: head of the variable list
|
|
* @remove: should we remove the entry from the list?
|
|
*
|
|
* Search for an entry on the variable list that has the EFI variable
|
|
* name @name and vendor guid @guid. If an entry is found on the list
|
|
* and @remove is true, the entry is removed from the list.
|
|
*
|
|
* The caller MUST call efivar_entry_iter_begin() and
|
|
* efivar_entry_iter_end() before and after the invocation of this
|
|
* function, respectively.
|
|
*
|
|
* Returns the entry if found on the list, %NULL otherwise.
|
|
*/
|
|
struct efivar_entry *efivar_entry_find(efi_char16_t *name, efi_guid_t guid,
|
|
struct list_head *head, bool remove)
|
|
{
|
|
struct efivar_entry *entry, *n;
|
|
int strsize1, strsize2;
|
|
bool found = false;
|
|
|
|
list_for_each_entry_safe(entry, n, head, list) {
|
|
strsize1 = ucs2_strsize(name, 1024);
|
|
strsize2 = ucs2_strsize(entry->var.VariableName, 1024);
|
|
if (strsize1 == strsize2 &&
|
|
!memcmp(name, &(entry->var.VariableName), strsize1) &&
|
|
!efi_guidcmp(guid, entry->var.VendorGuid)) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found)
|
|
return NULL;
|
|
|
|
if (remove) {
|
|
if (entry->scanning) {
|
|
/*
|
|
* The entry will be deleted
|
|
* after scanning is completed.
|
|
*/
|
|
entry->deleting = true;
|
|
} else
|
|
list_del(&entry->list);
|
|
}
|
|
|
|
return entry;
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivar_entry_find);
|
|
|
|
/**
|
|
* efivar_entry_size - obtain the size of a variable
|
|
* @entry: entry for this variable
|
|
* @size: location to store the variable's size
|
|
*/
|
|
int efivar_entry_size(struct efivar_entry *entry, unsigned long *size)
|
|
{
|
|
const struct efivar_operations *ops;
|
|
efi_status_t status;
|
|
|
|
*size = 0;
|
|
|
|
if (down_interruptible(&efivars_lock))
|
|
return -EINTR;
|
|
if (!__efivars) {
|
|
up(&efivars_lock);
|
|
return -EINVAL;
|
|
}
|
|
ops = __efivars->ops;
|
|
status = ops->get_variable(entry->var.VariableName,
|
|
&entry->var.VendorGuid, NULL, size, NULL);
|
|
up(&efivars_lock);
|
|
|
|
if (status != EFI_BUFFER_TOO_SMALL)
|
|
return efi_status_to_err(status);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivar_entry_size);
|
|
|
|
/**
|
|
* __efivar_entry_get - call get_variable()
|
|
* @entry: read data for this variable
|
|
* @attributes: variable attributes
|
|
* @size: size of @data buffer
|
|
* @data: buffer to store variable data
|
|
*
|
|
* The caller MUST call efivar_entry_iter_begin() and
|
|
* efivar_entry_iter_end() before and after the invocation of this
|
|
* function, respectively.
|
|
*/
|
|
int __efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
|
|
unsigned long *size, void *data)
|
|
{
|
|
efi_status_t status;
|
|
|
|
if (!__efivars)
|
|
return -EINVAL;
|
|
|
|
status = __efivars->ops->get_variable(entry->var.VariableName,
|
|
&entry->var.VendorGuid,
|
|
attributes, size, data);
|
|
|
|
return efi_status_to_err(status);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__efivar_entry_get);
|
|
|
|
/**
|
|
* efivar_entry_get - call get_variable()
|
|
* @entry: read data for this variable
|
|
* @attributes: variable attributes
|
|
* @size: size of @data buffer
|
|
* @data: buffer to store variable data
|
|
*/
|
|
int efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
|
|
unsigned long *size, void *data)
|
|
{
|
|
efi_status_t status;
|
|
|
|
if (down_interruptible(&efivars_lock))
|
|
return -EINTR;
|
|
|
|
if (!__efivars) {
|
|
up(&efivars_lock);
|
|
return -EINVAL;
|
|
}
|
|
|
|
status = __efivars->ops->get_variable(entry->var.VariableName,
|
|
&entry->var.VendorGuid,
|
|
attributes, size, data);
|
|
up(&efivars_lock);
|
|
|
|
return efi_status_to_err(status);
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivar_entry_get);
|
|
|
|
/**
|
|
* efivar_entry_set_get_size - call set_variable() and get new size (atomic)
|
|
* @entry: entry containing variable to set and get
|
|
* @attributes: attributes of variable to be written
|
|
* @size: size of data buffer
|
|
* @data: buffer containing data to write
|
|
* @set: did the set_variable() call succeed?
|
|
*
|
|
* This is a pretty special (complex) function. See efivarfs_file_write().
|
|
*
|
|
* Atomically call set_variable() for @entry and if the call is
|
|
* successful, return the new size of the variable from get_variable()
|
|
* in @size. The success of set_variable() is indicated by @set.
|
|
*
|
|
* Returns 0 on success, -EINVAL if the variable data is invalid,
|
|
* -ENOSPC if the firmware does not have enough available space, or a
|
|
* converted EFI status code if either of set_variable() or
|
|
* get_variable() fail.
|
|
*
|
|
* If the EFI variable does not exist when calling set_variable()
|
|
* (EFI_NOT_FOUND), @entry is removed from the variable list.
|
|
*/
|
|
int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
|
|
unsigned long *size, void *data, bool *set)
|
|
{
|
|
const struct efivar_operations *ops;
|
|
efi_char16_t *name = entry->var.VariableName;
|
|
efi_guid_t *vendor = &entry->var.VendorGuid;
|
|
efi_status_t status;
|
|
int err;
|
|
|
|
*set = false;
|
|
|
|
if (efivar_validate(*vendor, name, data, *size) == false)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* The lock here protects the get_variable call, the conditional
|
|
* set_variable call, and removal of the variable from the efivars
|
|
* list (in the case of an authenticated delete).
|
|
*/
|
|
if (down_interruptible(&efivars_lock))
|
|
return -EINTR;
|
|
|
|
if (!__efivars) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Ensure that the available space hasn't shrunk below the safe level
|
|
*/
|
|
status = check_var_size(attributes, *size + ucs2_strsize(name, 1024));
|
|
if (status != EFI_SUCCESS) {
|
|
if (status != EFI_UNSUPPORTED) {
|
|
err = efi_status_to_err(status);
|
|
goto out;
|
|
}
|
|
|
|
if (*size > 65536) {
|
|
err = -ENOSPC;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ops = __efivars->ops;
|
|
|
|
status = ops->set_variable(name, vendor, attributes, *size, data);
|
|
if (status != EFI_SUCCESS) {
|
|
err = efi_status_to_err(status);
|
|
goto out;
|
|
}
|
|
|
|
*set = true;
|
|
|
|
/*
|
|
* Writing to the variable may have caused a change in size (which
|
|
* could either be an append or an overwrite), or the variable to be
|
|
* deleted. Perform a GetVariable() so we can tell what actually
|
|
* happened.
|
|
*/
|
|
*size = 0;
|
|
status = ops->get_variable(entry->var.VariableName,
|
|
&entry->var.VendorGuid,
|
|
NULL, size, NULL);
|
|
|
|
if (status == EFI_NOT_FOUND)
|
|
efivar_entry_list_del_unlock(entry);
|
|
else
|
|
up(&efivars_lock);
|
|
|
|
if (status && status != EFI_BUFFER_TOO_SMALL)
|
|
return efi_status_to_err(status);
|
|
|
|
return 0;
|
|
|
|
out:
|
|
up(&efivars_lock);
|
|
return err;
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivar_entry_set_get_size);
|
|
|
|
/**
|
|
* efivar_entry_iter_begin - begin iterating the variable list
|
|
*
|
|
* Lock the variable list to prevent entry insertion and removal until
|
|
* efivar_entry_iter_end() is called. This function is usually used in
|
|
* conjunction with __efivar_entry_iter() or efivar_entry_iter().
|
|
*/
|
|
int efivar_entry_iter_begin(void)
|
|
{
|
|
return down_interruptible(&efivars_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivar_entry_iter_begin);
|
|
|
|
/**
|
|
* efivar_entry_iter_end - finish iterating the variable list
|
|
*
|
|
* Unlock the variable list and allow modifications to the list again.
|
|
*/
|
|
void efivar_entry_iter_end(void)
|
|
{
|
|
up(&efivars_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivar_entry_iter_end);
|
|
|
|
/**
|
|
* __efivar_entry_iter - iterate over variable list
|
|
* @func: callback function
|
|
* @head: head of the variable list
|
|
* @data: function-specific data to pass to callback
|
|
* @prev: entry to begin iterating from
|
|
*
|
|
* Iterate over the list of EFI variables and call @func with every
|
|
* entry on the list. It is safe for @func to remove entries in the
|
|
* list via efivar_entry_delete().
|
|
*
|
|
* You MUST call efivar_entry_iter_begin() before this function, and
|
|
* efivar_entry_iter_end() afterwards.
|
|
*
|
|
* It is possible to begin iteration from an arbitrary entry within
|
|
* the list by passing @prev. @prev is updated on return to point to
|
|
* the last entry passed to @func. To begin iterating from the
|
|
* beginning of the list @prev must be %NULL.
|
|
*
|
|
* The restrictions for @func are the same as documented for
|
|
* efivar_entry_iter().
|
|
*/
|
|
int __efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
|
|
struct list_head *head, void *data,
|
|
struct efivar_entry **prev)
|
|
{
|
|
struct efivar_entry *entry, *n;
|
|
int err = 0;
|
|
|
|
if (!prev || !*prev) {
|
|
list_for_each_entry_safe(entry, n, head, list) {
|
|
err = func(entry, data);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
if (prev)
|
|
*prev = entry;
|
|
|
|
return err;
|
|
}
|
|
|
|
|
|
list_for_each_entry_safe_continue((*prev), n, head, list) {
|
|
err = func(*prev, data);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__efivar_entry_iter);
|
|
|
|
/**
|
|
* efivar_entry_iter - iterate over variable list
|
|
* @func: callback function
|
|
* @head: head of variable list
|
|
* @data: function-specific data to pass to callback
|
|
*
|
|
* Iterate over the list of EFI variables and call @func with every
|
|
* entry on the list. It is safe for @func to remove entries in the
|
|
* list via efivar_entry_delete() while iterating.
|
|
*
|
|
* Some notes for the callback function:
|
|
* - a non-zero return value indicates an error and terminates the loop
|
|
* - @func is called from atomic context
|
|
*/
|
|
int efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
|
|
struct list_head *head, void *data)
|
|
{
|
|
int err = 0;
|
|
|
|
err = efivar_entry_iter_begin();
|
|
if (err)
|
|
return err;
|
|
err = __efivar_entry_iter(func, head, data, NULL);
|
|
efivar_entry_iter_end();
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivar_entry_iter);
|
|
|
|
/**
|
|
* efivars_kobject - get the kobject for the registered efivars
|
|
*
|
|
* If efivars_register() has not been called we return NULL,
|
|
* otherwise return the kobject used at registration time.
|
|
*/
|
|
struct kobject *efivars_kobject(void)
|
|
{
|
|
if (!__efivars)
|
|
return NULL;
|
|
|
|
return __efivars->kobject;
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivars_kobject);
|
|
|
|
/**
|
|
* efivar_run_worker - schedule the efivar worker thread
|
|
*/
|
|
void efivar_run_worker(void)
|
|
{
|
|
if (efivar_wq_enabled)
|
|
schedule_work(&efivar_work);
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivar_run_worker);
|
|
|
|
/**
|
|
* efivars_register - register an efivars
|
|
* @efivars: efivars to register
|
|
* @ops: efivars operations
|
|
* @kobject: @efivars-specific kobject
|
|
*
|
|
* Only a single efivars can be registered at any time.
|
|
*/
|
|
int efivars_register(struct efivars *efivars,
|
|
const struct efivar_operations *ops,
|
|
struct kobject *kobject)
|
|
{
|
|
if (down_interruptible(&efivars_lock))
|
|
return -EINTR;
|
|
|
|
efivars->ops = ops;
|
|
efivars->kobject = kobject;
|
|
|
|
__efivars = efivars;
|
|
|
|
pr_info("Registered efivars operations\n");
|
|
|
|
up(&efivars_lock);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivars_register);
|
|
|
|
/**
|
|
* efivars_unregister - unregister an efivars
|
|
* @efivars: efivars to unregister
|
|
*
|
|
* The caller must have already removed every entry from the list,
|
|
* failure to do so is an error.
|
|
*/
|
|
int efivars_unregister(struct efivars *efivars)
|
|
{
|
|
int rv;
|
|
|
|
if (down_interruptible(&efivars_lock))
|
|
return -EINTR;
|
|
|
|
if (!__efivars) {
|
|
printk(KERN_ERR "efivars not registered\n");
|
|
rv = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (__efivars != efivars) {
|
|
rv = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
pr_info("Unregistered efivars operations\n");
|
|
__efivars = NULL;
|
|
|
|
rv = 0;
|
|
out:
|
|
up(&efivars_lock);
|
|
return rv;
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivars_unregister);
|
|
|
|
int efivar_supports_writes(void)
|
|
{
|
|
return __efivars && __efivars->ops->set_variable;
|
|
}
|
|
EXPORT_SYMBOL_GPL(efivar_supports_writes);
|