hv_netvsc: Don't free decrypted memory
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>
This commit is contained in:
parent
211f514ebf
commit
bbf9ac3467
@ -154,8 +154,11 @@ static void free_netvsc_device(struct rcu_head *head)
|
|||||||
int i;
|
int i;
|
||||||
|
|
||||||
kfree(nvdev->extension);
|
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);
|
bitmap_free(nvdev->send_section_map);
|
||||||
|
|
||||||
for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
|
for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
|
||||||
|
Loading…
Reference in New Issue
Block a user