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hv_netvsc: Don't free decrypted memory

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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:
Rick Edgecombe 2024-03-11 09:15:56 -07:00 committed by Wei Liu
parent 211f514ebf
commit bbf9ac3467
1 changed files with 5 additions and 2 deletions
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3
drivers/net/hyperv/netvsc.c
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@ -154,7 +154,10 @@ static void free_netvsc_device(struct rcu_head *head)
int i;
kfree(nvdev->extension);
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);