File 0003-tpm2-resend-the-command-on-TPM_RC_RETRY.patch of Package grub2

Overview Repositories Revisions Requests Users Attributes Meta

File 0003-tpm2-resend-the-command-on-TPM_RC_RETRY.patch of Package grub2 (Revision b4c87c7310c3eb5e1f9efe0f994eec9e)

Currently displaying revision b4c87c7310c3eb5e1f9efe0f994eec9e , Show latest

From 14a8c03f1a3b09250ea933f1a072dfdfef8c4a48 Mon Sep 17 00:00:00 2001
From: Gary Lin <glin@suse.com>
Date: Thu, 9 Feb 2023 14:56:05 +0800
Subject: [PATCH 03/13] tpm2: resend the command on TPM_RC_RETRY

Sometimes TPM may return TPM_RC_RETRY for some reason, and the only
thing we can do is to send the command again. To avoid pending in the
while loop indefinitely, just try to send the command 3 times.

Signed-off-by: Gary Lin <glin@suse.com>
---
 grub-core/tpm2/tpm2.c | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/grub-core/tpm2/tpm2.c b/grub-core/tpm2/tpm2.c
index 5377ad2c7..1176d968b 100644
--- a/grub-core/tpm2/tpm2.c
+++ b/grub-core/tpm2/tpm2.c
@@ -25,11 +25,11 @@
 #include <grub/types.h>
 
 static TPM_RC
-grub_tpm2_submit_command (TPMI_ST_COMMAND_TAG tag,
-                          TPM_CC commandCode,
-                          TPM_RC* responseCode,
-                          const struct grub_tpm2_buffer* in,
-                          struct grub_tpm2_buffer* out)
+grub_tpm2_submit_command_real (const TPMI_ST_COMMAND_TAG tag,
+                               const TPM_CC commandCode,
+                               TPM_RC *responseCode,
+                               const struct grub_tpm2_buffer *in,
+                               struct grub_tpm2_buffer *out)
 {
   grub_err_t err;
   struct grub_tpm2_buffer buf;
@@ -75,6 +75,29 @@ grub_tpm2_submit_command (TPMI_ST_COMMAND_TAG tag,
   return TPM_RC_SUCCESS;
 }
 
+static TPM_RC
+grub_tpm2_submit_command (const TPMI_ST_COMMAND_TAG tag,
+                          const TPM_CC commandCode,
+                          TPM_RC *responseCode,
+                          const struct grub_tpm2_buffer *in,
+                          struct grub_tpm2_buffer *out)
+{
+  TPM_RC err;
+  int retry_cnt = 0;
+
+  /* Catch TPM_RC_RETRY and send the command again */
+  do {
+    err = grub_tpm2_submit_command_real (tag, commandCode, responseCode,
+                                         in, out);
+    if (err != TPM_RC_RETRY)
+      break;
+
+    retry_cnt++;
+  } while (retry_cnt < 3);
+
+  return err;
+}
+
 TPM_RC
 TPM2_CreatePrimary (const TPMI_RH_HIERARCHY primaryHandle,
                     const TPMS_AUTH_COMMAND *authCommand,
-- 
2.35.3

Places

File 0003-tpm2-resend-the-command-on-TPM_RC_RETRY.patch of Package grub2 (Revision b4c87c7310c3eb5e1f9efe0f994eec9e)

Places