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uio_hv_generic: 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 VMBus device UIO 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/20240311161558.1310-5-mhklinux@outlook.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20240311161558.1310-5-mhklinux@outlook.com>
This commit is contained in:
Rick Edgecombe 2024-03-11 09:15:57 -07:00 committed by Wei Liu
parent bbf9ac3467
commit 3d788b2fbe
1 changed files with 8 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/uio/uio_hv_generic.c
View file

@ -181,12 +181,14 @@ hv_uio_cleanup(struct hv_device *dev, struct hv_uio_private_data *pdata)
{
if (pdata->send_gpadl.gpadl_handle) {
vmbus_teardown_gpadl(dev->channel, &pdata->send_gpadl);
vfree(pdata->send_buf);
if (!pdata->send_gpadl.decrypted)
vfree(pdata->send_buf);
}
if (pdata->recv_gpadl.gpadl_handle) {
vmbus_teardown_gpadl(dev->channel, &pdata->recv_gpadl);
vfree(pdata->recv_buf);
if (!pdata->recv_gpadl.decrypted)
vfree(pdata->recv_buf);
}
}
@ -295,7 +297,8 @@ hv_uio_probe(struct hv_device *dev,
ret = vmbus_establish_gpadl(channel, pdata->recv_buf,
RECV_BUFFER_SIZE, &pdata->recv_gpadl);
if (ret) {
vfree(pdata->recv_buf);
if (!pdata->recv_gpadl.decrypted)
vfree(pdata->recv_buf);
goto fail_close;
}
@ -317,7 +320,8 @@ hv_uio_probe(struct hv_device *dev,
ret = vmbus_establish_gpadl(channel, pdata->send_buf,
SEND_BUFFER_SIZE, &pdata->send_gpadl);
if (ret) {
vfree(pdata->send_buf);
if (!pdata->send_gpadl.decrypted)
vfree(pdata->send_buf);
goto fail_close;
}