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commitad723674d6("x86/efi: move common keyring handler functions to new file") leave this unused. Fixes:ad723674d6("x86/efi: move common keyring handler functions to new file") Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: YueHaibing <yuehaibing@huawei.com> Link: https://lore.kernel.org/r/20191115130830.13320-1-yuehaibing@huawei.com
125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/cred.h>
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#include <linux/err.h>
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#include <linux/efi.h>
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#include <linux/slab.h>
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#include <keys/asymmetric-type.h>
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#include <keys/system_keyring.h>
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#include "../integrity.h"
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#include "keyring_handler.h"
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/*
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* Look to see if a UEFI variable called MokIgnoreDB exists and return true if
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* it does.
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*
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* This UEFI variable is set by the shim if a user tells the shim to not use
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* the certs/hashes in the UEFI db variable for verification purposes. If it
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* is set, we should ignore the db variable also and the true return indicates
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* this.
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*/
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static __init bool uefi_check_ignore_db(void)
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{
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efi_status_t status;
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unsigned int db = 0;
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unsigned long size = sizeof(db);
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efi_guid_t guid = EFI_SHIM_LOCK_GUID;
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status = efi.get_variable(L"MokIgnoreDB", &guid, NULL, &size, &db);
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return status == EFI_SUCCESS;
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}
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/*
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* Get a certificate list blob from the named EFI variable.
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*/
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static __init void *get_cert_list(efi_char16_t *name, efi_guid_t *guid,
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unsigned long *size)
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{
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efi_status_t status;
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unsigned long lsize = 4;
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unsigned long tmpdb[4];
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void *db;
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status = efi.get_variable(name, guid, NULL, &lsize, &tmpdb);
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if (status != EFI_BUFFER_TOO_SMALL) {
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pr_err("Couldn't get size: 0x%lx\n", status);
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return NULL;
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}
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db = kmalloc(lsize, GFP_KERNEL);
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if (!db)
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return NULL;
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status = efi.get_variable(name, guid, NULL, &lsize, db);
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if (status != EFI_SUCCESS) {
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kfree(db);
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pr_err("Error reading db var: 0x%lx\n", status);
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return NULL;
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}
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*size = lsize;
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return db;
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}
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/*
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* Load the certs contained in the UEFI databases into the platform trusted
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* keyring and the UEFI blacklisted X.509 cert SHA256 hashes into the blacklist
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* keyring.
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*/
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static int __init load_uefi_certs(void)
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{
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efi_guid_t secure_var = EFI_IMAGE_SECURITY_DATABASE_GUID;
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efi_guid_t mok_var = EFI_SHIM_LOCK_GUID;
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void *db = NULL, *dbx = NULL, *mok = NULL;
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unsigned long dbsize = 0, dbxsize = 0, moksize = 0;
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int rc = 0;
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if (!efi.get_variable)
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return false;
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/* Get db, MokListRT, and dbx. They might not exist, so it isn't
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* an error if we can't get them.
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*/
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if (!uefi_check_ignore_db()) {
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db = get_cert_list(L"db", &secure_var, &dbsize);
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if (!db) {
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pr_err("MODSIGN: Couldn't get UEFI db list\n");
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} else {
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rc = parse_efi_signature_list("UEFI:db",
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db, dbsize, get_handler_for_db);
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if (rc)
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pr_err("Couldn't parse db signatures: %d\n",
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rc);
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kfree(db);
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}
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}
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mok = get_cert_list(L"MokListRT", &mok_var, &moksize);
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if (!mok) {
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pr_info("Couldn't get UEFI MokListRT\n");
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} else {
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rc = parse_efi_signature_list("UEFI:MokListRT",
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mok, moksize, get_handler_for_db);
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if (rc)
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pr_err("Couldn't parse MokListRT signatures: %d\n", rc);
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kfree(mok);
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}
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dbx = get_cert_list(L"dbx", &secure_var, &dbxsize);
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if (!dbx) {
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pr_info("Couldn't get UEFI dbx list\n");
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} else {
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rc = parse_efi_signature_list("UEFI:dbx",
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dbx, dbxsize,
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get_handler_for_dbx);
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if (rc)
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pr_err("Couldn't parse dbx signatures: %d\n", rc);
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kfree(dbx);
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}
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return rc;
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}
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late_initcall(load_uefi_certs);
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