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 for Android: free password hash cracker in your pocket
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:   Thu,  5 Apr 2018 17:44:03 +0100
From:   Colin King <colin.king@...onical.com>
To:     Harsh Jain <harsh@...lsio.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Michael Werner <werner@...lsio.com>,
        Atul Gupta <atul.gupta@...lsio.com>,
        Casey Leedom <leedom@...lsio.com>, linux-crypto@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] crypto: chtls: don't leak information from the stack to userspace

From: Colin Ian King <colin.king@...onical.com>

The structure crypto_info contains fields that are not initialized and
only .version is set.  The copy_to_user call is hence leaking information
from the stack to userspace which must be avoided. Fix this by zero'ing
all the unused fields.

Detected by CoverityScan, CID#1467421 ("Uninitialized scalar variable")

Fixes: a08943947873 ("crypto: chtls - Register chtls with net tls")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/crypto/chelsio/chtls/chtls_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/chelsio/chtls/chtls_main.c b/drivers/crypto/chelsio/chtls/chtls_main.c
index 007c45c38fc7..69f3756eb980 100644
--- a/drivers/crypto/chelsio/chtls/chtls_main.c
+++ b/drivers/crypto/chelsio/chtls/chtls_main.c
@@ -441,7 +441,7 @@ static int chtls_uld_rx_handler(void *handle, const __be64 *rsp,
 static int do_chtls_getsockopt(struct sock *sk, char __user *optval,
 			       int __user *optlen)
 {
-	struct tls_crypto_info crypto_info;
+	struct tls_crypto_info crypto_info = { 0 };
 
 	crypto_info.version = TLS_1_2_VERSION;
 	if (copy_to_user(optval, &crypto_info, sizeof(struct tls_crypto_info)))
-- 
2.15.1

Powered by blists - more mailing lists