On Mon, Dec 11, 2023 at 09:32:20PM +0530, Hardevsinh Palaniya wrote: > In qcom_glink_send_open_req() remove error: strcpy() 'channel->name' > too large for 'req.name' (1010102 vs 32) > As far as I can tell, channel->name comes from the struct rpmsg_channel_info->name, which is a 32-byte array, and all code paths I can find either uses strscpy() or explicitly NUL-terminates this string. I'm curious to know which path took us here. > Signed-off-by: Hardevsinh Palaniya <hardevsinh.palaniya@xxxxxxxxxxxxxxxxx> > > diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c > index 82d460ff4777..2d6a592e1c72 100644 > --- a/drivers/rpmsg/qcom_glink_native.c > +++ b/drivers/rpmsg/qcom_glink_native.c > @@ -479,7 +479,7 @@ static int qcom_glink_send_open_req(struct qcom_glink *glink, > req.msg.cmd = cpu_to_le16(GLINK_CMD_OPEN); > req.msg.param1 = cpu_to_le16(channel->lcid); > req.msg.param2 = cpu_to_le32(name_len); > - strcpy(req.name, channel->name); > + strscpy_pad(req.name, channel->name, sizeof(req.name)); I think this patch is incomplete. While it makes sure we don't overwrite the stack. name_len is strlen(channel->name) + 1 and the amount of data sent out is based on name_len. As such, if you can get here with a @name of arbitrary length, then you can control how much of the stack we're going to now leak to the recipient. Regards, Bjorn > > ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true); > if (ret) > -- > 2.25.1 > >
