linux-kernel - [PATCH v2] misc: fastrpc: Remove user PD initmem size check

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Date: Thu, 27 Jun 2024 11:35:18 +0530
From: Ekansh Gupta <quic_ekangupt@...cinc.com>
To: <srinivas.kandagatla@...aro.org>, <linux-arm-msm@...r.kernel.org>
CC: <gregkh@...uxfoundation.org>, <quic_bkumar@...cinc.com>,
        <linux-kernel@...r.kernel.org>, <quic_chennak@...cinc.com>,
        <dri-devel@...ts.freedesktop.org>, <arnd@...db.de>,
        stable
	<stable@...nel.org>
Subject: [PATCH v2] misc: fastrpc: Remove user PD initmem size check

For user PD initialization, initmem is allocated and sent to DSP for
initial memory requirements like shell loading. This size is passed
by user space and is checked against a max size. For unsigned PD
offloading, more than 2MB size could be passed by user which would
result in PD initialization failure. Remove the user PD initmem size
check and allow buffer allocation for user passed size. Any additional
memory sent to DSP during PD init is used as the PD heap.

Fixes: 7f1f481263c3 ("misc: fastrpc: check before loading process to the DSP")
Cc: stable <stable@...nel.org>
Signed-off-by: Ekansh Gupta <quic_ekangupt@...cinc.com>
---
Changes in v2:
  - Modified commit text.
  - Removed size check instead of updating max file size.

 drivers/misc/fastrpc.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 5204fda51da3..9d064deeac89 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -1389,11 +1389,6 @@ static int fastrpc_init_create_process(struct fastrpc_user *fl,
 		goto err;
 	}
 
-	if (init.filelen > INIT_FILELEN_MAX) {
-		err = -EINVAL;
-		goto err;
-	}
-
 	inbuf.pgid = fl->tgid;
 	inbuf.namelen = strlen(current->comm) + 1;
 	inbuf.filelen = init.filelen;
-- 
2.34.1