[PATCH 6.6 153/301] hv_netvsc: Dont free decrypted memory

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


6.6-stable review patch.  If anyone has any objections, please let me know.


From: Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>

[ Upstream commit bbf9ac34677b57506a13682b31a2a718934c0e31 ]

In CoCo VMs it is possible for the untrusted host to cause
set_memory_encrypted() or set_memory_decrypted() to fail such that an
error is returned and the resulting memory is shared. Callers need to
take care to handle these errors to avoid returning decrypted (shared)
memory to the page allocator, which could lead to functional or security

The netvsc driver could free decrypted/shared pages if
set_memory_decrypted() fails. Check the decrypted field in the gpadl
to decide whether to free the memory.

Signed-off-by: Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>
Signed-off-by: Michael Kelley <mhklinux@xxxxxxxxxxx>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240311161558.1310-4-mhklinux@xxxxxxxxxxx
Signed-off-by: Wei Liu <wei.liu@xxxxxxxxxx>
Message-ID: <20240311161558.1310-4-mhklinux@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
 drivers/net/hyperv/netvsc.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 4f9658a741024..b2f27e505f76c 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -154,8 +154,11 @@ static void free_netvsc_device(struct rcu_head *head)
 	int i;
-	vfree(nvdev->recv_buf);
-	vfree(nvdev->send_buf);
+	if (!nvdev->recv_buf_gpadl_handle.decrypted)
+		vfree(nvdev->recv_buf);
+	if (!nvdev->send_buf_gpadl_handle.decrypted)
+		vfree(nvdev->send_buf);
 	for (i = 0; i < VRSS_CHANNEL_MAX; i++) {

[Index of Archives]     [Linux Kernel]     [Kernel Development Newbies]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Hiking]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux