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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Javier Martinez Canillas <javierm@redhat.com>
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Date: Sat, 16 May 2020 11:33:18 +0200
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Subject: [PATCH] tpm: Don't propagate TPM measurement errors to the verifiers
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layer
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Currently if the EFI firmware fails to do a TPM measurement for a file,
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the error will be propagated to the verifiers framework and so opening
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the file will not succeed.
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This mean that buggy firmwares will prevent the system to boot since the
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loader won't be able to open any file. But failing to do TPM measurements
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shouldn't be a fatal error and the system should still be able to boot.
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Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
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---
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grub-core/commands/tpm.c | 14 +++++++-------
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1 file changed, 7 insertions(+), 7 deletions(-)
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diff --git a/grub-core/commands/tpm.c b/grub-core/commands/tpm.c
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index 2052c36eab..e287d042e6 100644
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--- a/grub-core/commands/tpm.c
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+++ b/grub-core/commands/tpm.c
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@@ -42,7 +42,8 @@ grub_tpm_verify_init (grub_file_t io,
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static grub_err_t
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grub_tpm_verify_write (void *context, void *buf, grub_size_t size)
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{
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- return grub_tpm_measure (buf, size, GRUB_BINARY_PCR, context);
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+ grub_tpm_measure (buf, size, GRUB_BINARY_PCR, context);
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+ return GRUB_ERR_NONE;
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}
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static grub_err_t
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@@ -50,7 +51,6 @@ grub_tpm_verify_string (char *str, enum grub_verify_string_type type)
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{
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const char *prefix = NULL;
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char *description;
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- grub_err_t status;
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switch (type)
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{
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@@ -66,15 +66,15 @@ grub_tpm_verify_string (char *str, enum grub_verify_string_type type)
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}
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description = grub_malloc (grub_strlen (str) + grub_strlen (prefix) + 1);
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if (!description)
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- return grub_errno;
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+ return GRUB_ERR_NONE;
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grub_memcpy (description, prefix, grub_strlen (prefix));
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grub_memcpy (description + grub_strlen (prefix), str,
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grub_strlen (str) + 1);
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- status =
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- grub_tpm_measure ((unsigned char *) str, grub_strlen (str),
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- GRUB_STRING_PCR, description);
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+
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+ grub_tpm_measure ((unsigned char *) str, grub_strlen (str), GRUB_STRING_PCR,
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+ description);
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grub_free (description);
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- return status;
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+ return GRUB_ERR_NONE;
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}
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struct grub_file_verifier grub_tpm_verifier = {
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