msm: adsprpc: Validate sessions of process are of same pd type on same dsp.

Currently, a single process can create multiple sessions of different pd types.
 Now, force all sessions of a process to be of same pd type on same dsp. Also,
allow untrusted apps to create multiple sessions on dsp.

Signed-off-by: Krishna Dogney <[email protected]>
Change-Id:I98c97c1ceeefa303cee4909ccca280a2430da908

dsp/adsprpc.c

@@ -3943,9 +3943,12 @@ static int fastrpc_init_create_dynamic_process(struct fastrpc_file *fl,
 	struct smq_phy_page pages[PAGESLEN_WITH_SHAREDBUF];
 	struct fastrpc_mmap *file = NULL;
 	struct fastrpc_buf *imem = NULL;
-	unsigned long imem_dma_attr = 0;
+	unsigned long imem_dma_attr = 0, irq_flags = 0;
 	remote_arg_t ra[6];
 	int fds[6];
+	struct fastrpc_apps *me = &gfa;
+	struct hlist_node *n = NULL;
+	struct fastrpc_file *fl_curr = NULL;
 	unsigned int gid = 0, one_mb = 1024*1024;
 	unsigned int dsp_userpd_memlen = 0;
 	struct fastrpc_buf *init_mem;
@@ -3993,6 +3996,20 @@ static int fastrpc_init_create_dynamic_process(struct fastrpc_file *fl,
 	if (uproc->attrs & FASTRPC_MODE_UNSIGNED_MODULE)
 		fl->is_unsigned_pd = true;
 
+	/* Validate that any existing sessions of process are of same pd type */
+	spin_lock_irqsave(&me->hlock, irq_flags);
+	hlist_for_each_entry_safe(fl_curr, n, &me->drivers, hn) {
+		if ((fl != fl_curr) && (fl->tgid == fl_curr->tgid) && (fl->cid == fl_curr->cid)) {
+			err = (fl->is_unsigned_pd != fl_curr->is_unsigned_pd) ? -ECONNREFUSED : 0;
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&me->hlock, irq_flags);
+	if (err) {
+		ADSPRPC_ERR("existing session pd type %u not same as requested pd type %u \n",
+			fl_curr->is_unsigned_pd, fl->is_unsigned_pd);
+		goto bail;
+	}
 	/* Check if file memory passed by userspace is valid */
 	VERIFY(err, access_ok((void __user *)init->file, init->filelen));
 	if (err)
@@ -6765,12 +6782,6 @@ int fastrpc_setmode(unsigned long ioctl_param,
 		fl->profile = (uint32_t)ioctl_param;
 		break;
 	case FASTRPC_MODE_SESSION:
-		if (fl->untrusted_process) {
-			err = -EPERM;
-			ADSPRPC_ERR(
-				"multiple sessions not allowed for untrusted apps\n");
-			goto bail;
-		}
 		if (!fl->multi_session_support)
 			fl->sessionid = 1;
 		break;
@@ -6778,7 +6789,6 @@ int fastrpc_setmode(unsigned long ioctl_param,
 		err = -ENOTTY;
 		break;
 	}
-bail:
 	return err;
 }