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hv_netvsc: Don't free decrypted memory 

[ Upstream commit bbf9ac3467 ]

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
issues.

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@intel.com>
Signed-off-by: Michael Kelley <mhklinux@outlook.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Link: https://lore.kernel.org/r/20240311161558.1310-4-mhklinux@outlook.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20240311161558.1310-4-mhklinux@outlook.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Rick Edgecombe 2024-03-11 09:15:56 -07:00 committed by Greg Kroah-Hartman
parent 8e62341f5c
commit a56fe61132
1 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/net/hyperv/netvsc.c
View File

@ -154,8 +154,11 @@ static void free_netvsc_device(struct rcu_head *head)
int i;
kfree(nvdev->extension);
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);
bitmap_free(nvdev->send_section_map);
for (i = 0; i < VRSS_CHANNEL_MAX; i++) {