grub2/0216-tpm-Don-t-propagate-TPM-measurement-errors-to-the-ve.patch
Petr Šabata 100e37f2e6 RHEL 9.0.0 Alpha bootstrap
The content of this branch was automatically imported from Fedora ELN
with the following as its source:
https://src.fedoraproject.org/rpms/grub2#f7e054f3d693af43a903faf33b70673f7aca4508
2020-10-15 09:48:35 +02:00

63 lines
2.2 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Sat, 16 May 2020 11:33:18 +0200
Subject: [PATCH] tpm: Don't propagate TPM measurement errors to the verifiers
layer
Currently if the EFI firmware fails to do a TPM measurement for a file,
the error will be propagated to the verifiers framework and so opening
the file will not succeed.
This mean that buggy firmwares will prevent the system to boot since the
loader won't be able to open any file. But failing to do TPM measurements
shouldn't be a fatal error and the system should still be able to boot.
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---
grub-core/commands/tpm.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/grub-core/commands/tpm.c b/grub-core/commands/tpm.c
index 1441c494d81..dbaeae46dfa 100644
--- a/grub-core/commands/tpm.c
+++ b/grub-core/commands/tpm.c
@@ -49,7 +49,8 @@ grub_tpm_verify_init (grub_file_t io,
static grub_err_t
grub_tpm_verify_write (void *context, void *buf, grub_size_t size)
{
- return grub_tpm_measure (buf, size, GRUB_BINARY_PCR, context);
+ grub_tpm_measure (buf, size, GRUB_BINARY_PCR, context);
+ return GRUB_ERR_NONE;
}
static grub_err_t
@@ -57,7 +58,6 @@ grub_tpm_verify_string (char *str, enum grub_verify_string_type type)
{
const char *prefix = NULL;
char *description;
- grub_err_t status;
switch (type)
{
@@ -73,15 +73,15 @@ grub_tpm_verify_string (char *str, enum grub_verify_string_type type)
}
description = grub_malloc (grub_strlen (str) + grub_strlen (prefix) + 1);
if (!description)
- return grub_errno;
+ return GRUB_ERR_NONE;
grub_memcpy (description, prefix, grub_strlen (prefix));
grub_memcpy (description + grub_strlen (prefix), str,
grub_strlen (str) + 1);
- status =
- grub_tpm_measure ((unsigned char *) str, grub_strlen (str),
- GRUB_STRING_PCR, description);
+
+ grub_tpm_measure ((unsigned char *) str, grub_strlen (str), GRUB_STRING_PCR,
+ description);
grub_free (description);
- return status;
+ return GRUB_ERR_NONE;
}
struct grub_file_verifier grub_tpm_verifier = {