This is a note to let you know that I've just added the patch titled
misc: fastrpc: Reassign memory ownership only for remote heap
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
misc-fastrpc-reassign-memory-ownership-only-for-remote-heap.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3c7d0079a1831118ef232bd9c2f34d058a1f31c2 Mon Sep 17 00:00:00 2001
From: Ekansh Gupta <quic_ekangupt@xxxxxxxxxxx>
Date: Tue, 23 May 2023 16:25:48 +0100
Subject: misc: fastrpc: Reassign memory ownership only for remote heap
From: Ekansh Gupta <quic_ekangupt@xxxxxxxxxxx>
commit 3c7d0079a1831118ef232bd9c2f34d058a1f31c2 upstream.
The userspace map request for remote heap allocates CMA memory.
The ownership of this memory needs to be reassigned to proper
owners to allow access from the protection domain running on
DSP. This reassigning of ownership is not correct if done for
any other supported flags.
When any other flag is requested from userspace, fastrpc is
trying to reassign the ownership of memory and this reassignment
is getting skipped for remote heap request which is incorrect.
Add proper flag check to reassign the memory only if remote heap
is requested.
Fixes: 532ad70c6d44 ("misc: fastrpc: Add mmap request assigning for static PD pool")
Cc: stable <stable@xxxxxxxxxx>
Tested-by: Ekansh Gupta <quic_ekangupt@xxxxxxxxxxx>
Signed-off-by: Ekansh Gupta <quic_ekangupt@xxxxxxxxxxx>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230523152550.438363-3-srinivas.kandagatla@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/misc/fastrpc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 32a5415624bf..a654dc416480 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -1904,7 +1904,7 @@ static int fastrpc_req_mmap(struct fastrpc_user *fl, char __user *argp)
req.vaddrout = rsp_msg.vaddr;
/* Add memory to static PD pool, protection thru hypervisor */
- if (req.flags != ADSP_MMAP_REMOTE_HEAP_ADDR && fl->cctx->vmcount) {
+ if (req.flags == ADSP_MMAP_REMOTE_HEAP_ADDR && fl->cctx->vmcount) {
struct qcom_scm_vmperm perm;
perm.vmid = QCOM_SCM_VMID_HLOS;
--
2.41.0
Patches currently in stable-queue which might be from quic_ekangupt@xxxxxxxxxxx are
queue-6.3/misc-fastrpc-reassign-memory-ownership-only-for-remote-heap.patch
