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ima: Fix the error code for restoring the PCR value

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[ 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: 47fdee60b4 ("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>
This commit is contained in:
Li Huafei 2021-03-03 11:28:24 +08:00 committed by Greg Kroah-Hartman
parent 536175f006
commit 6b4b3b8404
1 changed files with 2 additions and 2 deletions
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4
security/integrity/ima/ima_template.c
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@ -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;