ima: Fix the error code for restoring the PCR value

[ 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@huawei.com>
Reviewed-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c
index 1e89e2d..f83255a 100644 (file)
--- a/security/integrity/ima/ima_template.c
+++ b/security/integrity/ima/ima_template.c
@@ -468,8 +468,8 @@ 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;