linux-kernel - [PATCH 5.12 464/677] ima: Fix the error code for restoring the PCR value

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Date:   Wed, 12 May 2021 16:48:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Li Huafei <lihuafei1@...wei.com>,
        Roberto Sassu <roberto.sassu@...wei.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 464/677] ima: Fix the error code for restoring the PCR value

From: Li Huafei <lihuafei1@...wei.com>

[ Upstream commit 7990ccafaa37dc6d8bb095d4d7cd997e8903fd10 ]

In ima_restore_measurement_list(), hdr[HDR_PCR].data is pointing to a
buffer of type u8, which contains the dumped 32-bit pcr value.
Currently, only the least significant byte is used to restore the pcr
value. We should convert hdr[HDR_PCR].data to a pointer of type u32
before fetching the value to restore the correct pcr value.

Fixes: 47fdee60b47f ("ima: use ima_parse_buf() to parse measurements headers")
Signed-off-by: Li Huafei <lihuafei1@...wei.com>
Reviewed-by: Roberto Sassu <roberto.sassu@...wei.com>
Signed-off-by: Mimi Zohar <zohar@...ux.ibm.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 security/integrity/ima/ima_template.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c
index e22e510ae92d..4e081e650047 100644
--- a/security/integrity/ima/ima_template.c
+++ b/security/integrity/ima/ima_template.c
@@ -494,8 +494,8 @@ int ima_restore_measurement_list(loff_t size, void *buf)
 			}
 		}
 
-		entry->pcr = !ima_canonical_fmt ? *(hdr[HDR_PCR].data) :
-			     le32_to_cpu(*(hdr[HDR_PCR].data));
+		entry->pcr = !ima_canonical_fmt ? *(u32 *)(hdr[HDR_PCR].data) :
+			     le32_to_cpu(*(u32 *)(hdr[HDR_PCR].data));
 		ret = ima_restore_measurement_entry(entry);
 		if (ret < 0)
 			break;
-- 
2.30.2