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

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Date:   Wed, 3 Mar 2021 11:28:24 +0800
From:   Li Huafei <lihuafei1@...wei.com>
To:     <zohar@...ux.ibm.com>, <roberto.sassu@...wei.com>,
        <linux-integrity@...r.kernel.org>,
        <linux-security-module@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <dmitry.kasatkin@...il.com>, <jmorris@...ei.org>,
        <serge@...lyn.com>, <yangjihong1@...wei.com>,
        <zhangjinhao2@...wei.com>, <lihuafei1@...wei.com>
Subject: [PATCH] ima: Fix the error code for restoring the PCR value

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>
---
 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;
-- 
2.17.1