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tpm: handle short write

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There is no guarantee that the write can send the whole buffer at once.

In those rare occasions, we should return a sensible error.

Signed-off-by: Wei Liu <liuwe@microsoft.com>
This commit is contained in:
Wei Liu 2023-01-30 22:14:35 +00:00 committed by Rob Bradford
parent 6e22f23831
commit 5646a917ff
1 changed files with 8 additions and 1 deletions
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9
tpm/src/emulator.rs
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@ -208,7 +208,7 @@ impl Emulator {
buf.extend(converted_req);
debug!("full Control request {:02X?}", buf);
let _res = self.control_socket.write(&buf).map_err(|e| {
let written = self.control_socket.write(&buf).map_err(|e| {
Error::RunControlCmd(anyhow!(
"Failed while running {:02X?} Control Cmd. Error: {:?}",
cmd,
@ -216,6 +216,13 @@ impl Emulator {
))
})?;
if written < buf.len() {
return Err(Error::RunControlCmd(anyhow!(
"Truncated write while running {:02X?} Control Cmd",
cmd,
)));
}
// The largest response is 16 bytes so far.
if msg_len_out > 16 {
return Err(Error::RunControlCmd(anyhow!(