linux-kernel - [PATCH] Revert "misc: fastrpc: Restrict untrusted app to attach to privileged PD"

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Message-ID: <20240815094920.8242-1-griffin@kroah.com>
Date: Thu, 15 Aug 2024 11:49:20 +0200
From: Griffin Kroah-Hartman <griffin@...ah.com>
To: srinivas.kandagatla@...aro.org,
	amahesh@....qualcomm.com
Cc: linux-arm-msm@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Griffin Kroah-Hartman <griffin@...ah.com>,
	stable <stable@...nel.org>,
	Ekansh Gupta <quic_ekangupt@...cinc.com>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Joel Selvaraj <joelselvaraj.oss@...il.com>
Subject: [PATCH] Revert "misc: fastrpc: Restrict untrusted app to attach to privileged PD"

This reverts commit bab2f5e8fd5d2f759db26b78d9db57412888f187.

Joel reported that this commit breaks userspace and stops sensors in
SDM845 from working. Also breaks other qcom SoC devices running postmarketOS.

Cc: stable <stable@...nel.org>
Cc: Ekansh Gupta <quic_ekangupt@...cinc.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Reported-by: Joel Selvaraj <joelselvaraj.oss@...il.com>
Link: https://lore.kernel.org/r/9a9f5646-a554-4b65-8122-d212bb665c81@umsystem.edu
Signed-off-by: Griffin Kroah-Hartman <griffin@...ah.com>
---
 drivers/misc/fastrpc.c      | 22 +++-------------------
 include/uapi/misc/fastrpc.h |  3 ---
 2 files changed, 3 insertions(+), 22 deletions(-)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 5204fda51da3..339d126414d4 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -2085,16 +2085,6 @@ static int fastrpc_req_mem_map(struct fastrpc_user *fl, char __user *argp)
 	return err;
 }
 
-static int is_attach_rejected(struct fastrpc_user *fl)
-{
-	/* Check if the device node is non-secure */
-	if (!fl->is_secure_dev) {
-		dev_dbg(&fl->cctx->rpdev->dev, "untrusted app trying to attach to privileged DSP PD\n");
-		return -EACCES;
-	}
-	return 0;
-}
-
 static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
 				 unsigned long arg)
 {
@@ -2107,19 +2097,13 @@ static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
 		err = fastrpc_invoke(fl, argp);
 		break;
 	case FASTRPC_IOCTL_INIT_ATTACH:
-		err = is_attach_rejected(fl);
-		if (!err)
-			err = fastrpc_init_attach(fl, ROOT_PD);
+		err = fastrpc_init_attach(fl, ROOT_PD);
 		break;
 	case FASTRPC_IOCTL_INIT_ATTACH_SNS:
-		err = is_attach_rejected(fl);
-		if (!err)
-			err = fastrpc_init_attach(fl, SENSORS_PD);
+		err = fastrpc_init_attach(fl, SENSORS_PD);
 		break;
 	case FASTRPC_IOCTL_INIT_CREATE_STATIC:
-		err = is_attach_rejected(fl);
-		if (!err)
-			err = fastrpc_init_create_static_process(fl, argp);
+		err = fastrpc_init_create_static_process(fl, argp);
 		break;
 	case FASTRPC_IOCTL_INIT_CREATE:
 		err = fastrpc_init_create_process(fl, argp);
diff --git a/include/uapi/misc/fastrpc.h b/include/uapi/misc/fastrpc.h
index 91583690bddc..f33d914d8f46 100644
--- a/include/uapi/misc/fastrpc.h
+++ b/include/uapi/misc/fastrpc.h
@@ -8,14 +8,11 @@
 #define FASTRPC_IOCTL_ALLOC_DMA_BUFF	_IOWR('R', 1, struct fastrpc_alloc_dma_buf)
 #define FASTRPC_IOCTL_FREE_DMA_BUFF	_IOWR('R', 2, __u32)
 #define FASTRPC_IOCTL_INVOKE		_IOWR('R', 3, struct fastrpc_invoke)
-/* This ioctl is only supported with secure device nodes */
 #define FASTRPC_IOCTL_INIT_ATTACH	_IO('R', 4)
 #define FASTRPC_IOCTL_INIT_CREATE	_IOWR('R', 5, struct fastrpc_init_create)
 #define FASTRPC_IOCTL_MMAP		_IOWR('R', 6, struct fastrpc_req_mmap)
 #define FASTRPC_IOCTL_MUNMAP		_IOWR('R', 7, struct fastrpc_req_munmap)
-/* This ioctl is only supported with secure device nodes */
 #define FASTRPC_IOCTL_INIT_ATTACH_SNS	_IO('R', 8)
-/* This ioctl is only supported with secure device nodes */
 #define FASTRPC_IOCTL_INIT_CREATE_STATIC _IOWR('R', 9, struct fastrpc_init_create_static)
 #define FASTRPC_IOCTL_MEM_MAP		_IOWR('R', 10, struct fastrpc_mem_map)
 #define FASTRPC_IOCTL_MEM_UNMAP		_IOWR('R', 11, struct fastrpc_mem_unmap)
-- 
2.46.0