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62 lines
2.7 KiB
62 lines
2.7 KiB
8 months ago
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From b4d4cbd6c0e4fae721d64432c79ad00f531e6fdd Mon Sep 17 00:00:00 2001
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From: Dan Streetman <ddstreet@ieee.org>
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Date: Tue, 10 Oct 2023 16:55:39 -0400
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Subject: [PATCH] tpm2: don't use GetCapability() to check transient handles
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The kernel tpm "resource manager" interface doesn't report that any transient
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handles exist, even if they do, so don't bother asking if the handle is
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transient.
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(cherry picked from commit 9c18019787a767fb6ed5cb906b6ad52847ee34cd)
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Related: RHEL-16182
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---
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src/shared/tpm2-util.c | 34 ++++++++++++++++++++--------------
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1 file changed, 20 insertions(+), 14 deletions(-)
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diff --git a/src/shared/tpm2-util.c b/src/shared/tpm2-util.c
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index c487b1f0ee..7baa86a4e1 100644
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--- a/src/shared/tpm2-util.c
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+++ b/src/shared/tpm2-util.c
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@@ -814,20 +814,26 @@ int tpm2_index_to_handle(
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"Invalid handle 0x%08" PRIx32 " (in unknown range).", index);
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}
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- r = tpm2_get_capability_handle(c, index);
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- if (r < 0)
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- return r;
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- if (r == 0) {
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- log_debug("TPM handle 0x%08" PRIx32 " not populated.", index);
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- if (ret_public)
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- *ret_public = NULL;
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- if (ret_name)
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- *ret_name = NULL;
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- if (ret_qname)
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- *ret_qname = NULL;
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- if (ret_handle)
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- *ret_handle = NULL;
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- return 0;
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+ /* For transient handles, the kernel tpm "resource manager" (i.e. /dev/tpmrm0) never acknowleges that
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+ * any transient handles exist, even if they actually do. So a failure to find the requested handle
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+ * index, if it's a transient handle, may not actually mean it's not present in the tpm; thus, only
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+ * check GetCapability() if the handle isn't transient. */
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+ if (TPM2_HANDLE_TYPE(index) != TPM2_HT_TRANSIENT) { // FIXME: once kernel tpmrm is fixed to acknowledge transient handles, check transient handles too
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+ r = tpm2_get_capability_handle(c, index);
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+ if (r < 0)
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+ return r;
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+ if (r == 0) {
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+ log_debug("TPM handle 0x%08" PRIx32 " not populated.", index);
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+ if (ret_public)
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+ *ret_public = NULL;
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+ if (ret_name)
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+ *ret_name = NULL;
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+ if (ret_qname)
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+ *ret_qname = NULL;
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+ if (ret_handle)
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+ *ret_handle = NULL;
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+ return 0;
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+ }
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}
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_cleanup_(tpm2_handle_freep) Tpm2Handle *handle = NULL;
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