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virtio-devices: vhost_user: block: Only change mutable field in write_config()

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The only driver writable field in the virtio-block specification is the
writeback one. Check that the offset being written to is for that field
and update it.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2020-07-16 11:00:48 +01:00 committed by Sebastien Boeuf
parent eabcd618ba
commit dfd6f3471d
1 changed files with 12 additions and 7 deletions
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19
virtio-devices/src/vhost_user/blk.rs
View File

@ -191,18 +191,23 @@ impl VirtioDevice for Blk {
}
fn write_config(&mut self, offset: u64, data: &[u8]) {
let config_slice = self.config.as_mut_slice();
let data_len = data.len() as u64;
let config_len = config_slice.len() as u64;
if offset + data_len > config_len {
error!("Failed to write config space");
// The "writeback" field is the only mutable field
let writeback_offset =
(&self.config.writeback as *const _ as u64) - (&self.config as *const _ as u64);
if offset != writeback_offset || data.len() != std::mem::size_of_val(&self.config.writeback)
{
error!(
"Attempt to write to read-only field: offset {:x} length {}",
offset,
data.len()
);
return;
}
self.config.writeback = data[0];
self.vhost_user_blk
.set_config(offset as u32, VhostUserConfigFlags::WRITABLE, data)
.expect("Failed to set config");
let (_, right) = config_slice.split_at_mut(offset as usize);
right.copy_from_slice(&data[..]);
}
fn activate(