lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Sat, 09 Sep 2017 22:47:14 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Eric Biggers" <ebiggers3@...il.com>,
        "Gilad Ben-Yossef" <gilad@...yossef.com>,
        "Herbert Xu" <herbert@...dor.apana.org.au>
Subject: [PATCH 3.16 079/233] crypto: gcm - wait for crypto op not signal safe

3.16.48-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Gilad Ben-Yossef <gilad@...yossef.com>

commit f3ad587070d6bd961ab942b3fd7a85d00dfc934b upstream.

crypto_gcm_setkey() was using wait_for_completion_interruptible() to
wait for completion of async crypto op but if a signal occurs it
may return before DMA ops of HW crypto provider finish, thus
corrupting the data buffer that is kfree'ed in this case.

Resolve this by using wait_for_completion() instead.

Reported-by: Eric Biggers <ebiggers3@...il.com>
Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 crypto/gcm.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/crypto/gcm.c
+++ b/crypto/gcm.c
@@ -146,10 +146,8 @@ static int crypto_gcm_setkey(struct cryp
 
 	err = crypto_ablkcipher_encrypt(&data->req);
 	if (err == -EINPROGRESS || err == -EBUSY) {
-		err = wait_for_completion_interruptible(
-			&data->result.completion);
-		if (!err)
-			err = data->result.err;
+		wait_for_completion(&data->result.completion);
+		err = data->result.err;
 	}
 
 	if (err)

Powered by blists - more mailing lists