lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20240906202745.11159-7-gourry@gourry.net>
Date: Fri,  6 Sep 2024 16:27:45 -0400
From: Gregory Price <gourry@...rry.net>
To: linux-efi@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	ardb@...nel.org,
	leitao@...ian.org,
	usamaarif642@...il.com,
	sathyanarayanan.kuppuswamy@...ux.intel.com,
	ilias.apalodimas@...aro.org
Subject: [PATCH 6/6] libstub,tpm: do not ignore failure case when reading final event log

Current code fails to check for an error case when reading events from
final event log to calculate offsets.  Check the error case, report the
error, and break early because all subsequent calls will also fail.

Signed-off-by: Gregory Price <gourry@...rry.net>
---
 drivers/firmware/efi/libstub/tpm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/firmware/efi/libstub/tpm.c b/drivers/firmware/efi/libstub/tpm.c
index 4f9f0e049a7a..c71b0d3e66d2 100644
--- a/drivers/firmware/efi/libstub/tpm.c
+++ b/drivers/firmware/efi/libstub/tpm.c
@@ -124,6 +124,10 @@ static void efi_retrieve_tcg2_eventlog(int version, efi_physical_addr_t log_loca
 			event_size = __calc_tpm2_event_size(header,
 						   (void *)(long)log_location,
 						   false);
+			if (!event_size) {
+				efi_err("Invalid TPM Final Event Log Entry\n");
+				break;
+			}
 			final_events_size += event_size;
 			i--;
 		}
-- 
2.43.0


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ