[PATCH v2 01/12] ima: Don't ignore errors from crypto_shash_update()
Roberto Sassu
roberto.sassu at huawei.com
Fri Sep 4 09:23:28 UTC 2020
Errors returned by crypto_shash_update() are not checked in
ima_calc_boot_aggregate_tfm() and thus can be overwritten at the next
iteration of the loop. This patch adds a check after calling
crypto_shash_update() and returns immediately if the result is not zero.
Cc: stable at vger.kernel.org
Fixes: 3323eec921efd ("integrity: IMA as an integrity service provider")
Signed-off-by: Roberto Sassu <roberto.sassu at huawei.com>
Reviewed-by: Mimi Zohar <zohar at linux.ibm.com>
---
security/integrity/ima/ima_crypto.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c
index 011c3c76af86..21989fa0c107 100644
--- a/security/integrity/ima/ima_crypto.c
+++ b/security/integrity/ima/ima_crypto.c
@@ -829,6 +829,8 @@ static int ima_calc_boot_aggregate_tfm(char *digest, u16 alg_id,
/* now accumulate with current aggregate */
rc = crypto_shash_update(shash, d.digest,
crypto_shash_digestsize(tfm));
+ if (rc != 0)
+ return rc;
}
/*
* Extend cumulative digest over TPM registers 8-9, which contain
--
2.27.GIT
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