linux-kernel - [PATCH 5.9 079/757] ima: Dont ignore errors from crypto_shash

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Message-Id: <20201027135454.258996188@linuxfoundation.org>
Date:   Tue, 27 Oct 2020 14:45:29 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Roberto Sassu <roberto.sassu@...wei.com>,
        Mimi Zohar <zohar@...ux.ibm.com>
Subject: [PATCH 5.9 079/757] ima: Dont ignore errors from crypto_shash_update()

From: Roberto Sassu <roberto.sassu@...wei.com>

commit 60386b854008adc951c470067f90a2d85b5d520f upstream.

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@...r.kernel.org
Fixes: 3323eec921efd ("integrity: IMA as an integrity service provider")
Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
Signed-off-by: Mimi Zohar <zohar@...ux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 security/integrity/ima/ima_crypto.c |    2 ++
 1 file changed, 2 insertions(+)

--- 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(c
 		/* 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