From: Julian Wiedmann <jwi@linux.ibm.com>
To: David Miller <davem@davemloft.net>
Cc: <netdev@vger.kernel.org>, <linux-s390@vger.kernel.org>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Stefan Raspl <raspl@linux.ibm.com>,
Ursula Braun <ubraun@linux.ibm.com>,
Julian Wiedmann <jwi@linux.ibm.com>
Subject: [PATCH net] s390/qeth: reject oversized SNMP requests
Date: Fri, 23 Aug 2019 11:29:23 +0200 [thread overview]
Message-ID: <20190823092923.8507-1-jwi@linux.ibm.com> (raw)
Commit d4c08afafa04 ("s390/qeth: streamline SNMP cmd code") removed
the bounds checking for req_len, under the assumption that the check in
qeth_alloc_cmd() would suffice.
But that code path isn't sufficiently robust to handle a user-provided
data_length, which could overflow (when adding the cmd header overhead)
before being checked against QETH_BUFSIZE. We end up allocating just a
tiny iob, and the subsequent copy_from_user() writes past the end of
that iob.
Special-case this path and add a coarse bounds check, to protect against
maliciuous requests. This let's the subsequent code flow do its normal
job and precise checking, without risk of overflow.
Fixes: d4c08afafa04 ("s390/qeth: streamline SNMP cmd code")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
---
drivers/s390/net/qeth_core_main.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 9c3310c4d61d..6502b148541e 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -4374,6 +4374,10 @@ static int qeth_snmp_command(struct qeth_card *card, char __user *udata)
get_user(req_len, &ureq->hdr.req_len))
return -EFAULT;
+ /* Sanitize user input, to avoid overflows in iob size calculation: */
+ if (req_len > QETH_BUFSIZE)
+ return -EINVAL;
+
iob = qeth_get_adapter_cmd(card, IPA_SETADP_SET_SNMP_CONTROL, req_len);
if (!iob)
return -ENOMEM;
--
2.17.1
next reply other threads:[~2019-08-23 9:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-23 9:29 Julian Wiedmann [this message]
2019-08-23 9:31 ` [PATCH net] s390/qeth: reject oversized SNMP requests Julian Wiedmann
2019-08-24 23:35 ` David Miller
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