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From 3ce5852ec6add45a28fe1706e9163351940e905c Mon Sep 17 00:00:00 2001
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From: Peter Jones <pjones@redhat.com>
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Date: Mon, 2 Oct 2017 18:25:29 -0400
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Subject: [PATCH 1/3] Make get_cert_list() not complain about cert lists that
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aren't present.
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Signed-off-by: Peter Jones <pjones@redhat.com>
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---
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certs/load_uefi.c | 37 ++++++++++++++++++++++---------------
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1 file changed, 22 insertions(+), 15 deletions(-)
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diff --git a/certs/load_uefi.c b/certs/load_uefi.c
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index 3d884598601..9ef34c44fd1 100644
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--- a/certs/load_uefi.c
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+++ b/certs/load_uefi.c
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@@ -35,8 +35,8 @@ static __init bool uefi_check_ignore_db(void)
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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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+static __init int get_cert_list(efi_char16_t *name, efi_guid_t *guid,
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+ unsigned long *size, void **cert_list)
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{
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efi_status_t status;
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unsigned long lsize = 4;
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@@ -44,26 +44,33 @@ static __init void *get_cert_list(efi_char16_t *name, efi_guid_t *guid,
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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_NOT_FOUND) {
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+ *size = 0;
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+ *cert_list = NULL;
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+ return 0;
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+ }
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+
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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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+ return efi_status_to_err(status);
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}
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db = kmalloc(lsize, GFP_KERNEL);
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if (!db) {
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pr_err("Couldn't allocate memory for uefi cert list\n");
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- return NULL;
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+ return -ENOMEM;
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}
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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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+ return efi_status_to_err(status);
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}
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*size = lsize;
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- return db;
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+ *cert_list = db;
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+ return 0;
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}
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/*
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@@ -152,10 +159,10 @@ static int __init load_uefi_certs(void)
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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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+ rc = get_cert_list(L"db", &secure_var, &dbsize, &db);
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+ if (rc < 0) {
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pr_err("MODSIGN: Couldn't get UEFI db list\n");
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- } else {
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+ } else if (dbsize != 0) {
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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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@@ -164,10 +171,10 @@ static int __init load_uefi_certs(void)
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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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+ rc = get_cert_list(L"MokListRT", &mok_var, &moksize, &mok;;
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+ if (rc < 0) {
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pr_info("MODSIGN: Couldn't get UEFI MokListRT\n");
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- } else {
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+ } else if (moksize != 0) {
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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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@@ -175,10 +182,10 @@ static int __init load_uefi_certs(void)
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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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+ rc = get_cert_list(L"dbx", &secure_var, &dbxsize, &dbx;;
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+ if (rc < 0) {
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pr_info("MODSIGN: Couldn't get UEFI dbx list\n");
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- } else {
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+ } else if (dbxsize != 0) {
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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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--
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2.15.0
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