rpmsg: validate incoming message length before propagating

When an inbound message arrives, validate its reported length before
propagating it, otherwise buggy (or malicious) remote processors might
trick us into accessing memory which we really shouldn't.

Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Mark Grosen <mgrosen@ti.com>
Cc: Suman Anna <s-anna@ti.com>
Cc: Fernando Guzman Lugo <fernando.lugo@ti.com>
Cc: Rob Clark <rob@ti.com>
Cc: Ludovic BARRE <ludovic.barre@stericsson.com>
Cc: Loic PALLARDY <loic.pallardy@stericsson.com>
Cc: Omar Ramirez Luna <omar.luna@linaro.org>
This commit is contained in:
Ohad Ben-Cohen 2012-02-28 16:16:48 +02:00
parent fa2d7795b2
commit 9648224e56

View File

@ -778,6 +778,16 @@ static void rpmsg_recv_done(struct virtqueue *rvq)
print_hex_dump(KERN_DEBUG, "rpmsg_virtio RX: ", DUMP_PREFIX_NONE, 16, 1, print_hex_dump(KERN_DEBUG, "rpmsg_virtio RX: ", DUMP_PREFIX_NONE, 16, 1,
msg, sizeof(*msg) + msg->len, true); msg, sizeof(*msg) + msg->len, true);
/*
* We currently use fixed-sized buffers, so trivially sanitize
* the reported payload length.
*/
if (len > RPMSG_BUF_SIZE ||
msg->len > (len - sizeof(struct rpmsg_hdr))) {
dev_warn(dev, "inbound msg too big: (%d, %d)\n", len, msg->len);
return;
}
/* use the dst addr to fetch the callback of the appropriate user */ /* use the dst addr to fetch the callback of the appropriate user */
mutex_lock(&vrp->endpoints_lock); mutex_lock(&vrp->endpoints_lock);
ept = idr_find(&vrp->endpoints, msg->dst); ept = idr_find(&vrp->endpoints, msg->dst);