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std: get rid of pre-Vista fallback code #139021

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merged 1 commit into from
Mar 28, 2025
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std: get rid of pre-Vista fallback code #139021

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28 changes: 6 additions & 22 deletions library/std/src/sys/pal/windows/pipe.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -74,7 +74,6 @@ pub fn anon_pipe(ours_readable: bool, their_handle_inheritable: bool) -> io::Res
let ours;
let mut name;
let mut tries = 0;
let mut reject_remote_clients_flag = c::PIPE_REJECT_REMOTE_CLIENTS;
loop {
tries += 1;
name = format!(
Expand All @@ -96,7 +95,7 @@ pub fn anon_pipe(ours_readable: bool, their_handle_inheritable: bool) -> io::Res
c::PIPE_TYPE_BYTE
| c::PIPE_READMODE_BYTE
| c::PIPE_WAIT
| reject_remote_clients_flag,
| c::PIPE_REJECT_REMOTE_CLIENTS,
1,
PIPE_BUFFER_CAPACITY,
PIPE_BUFFER_CAPACITY,
Expand All @@ -112,30 +111,15 @@ pub fn anon_pipe(ours_readable: bool, their_handle_inheritable: bool) -> io::Res
//
// Don't try again too much though as this could also perhaps be a
// legit error.
// If `ERROR_INVALID_PARAMETER` is returned, this probably means we're
// running on pre-Vista version where `PIPE_REJECT_REMOTE_CLIENTS` is
// not supported, so we continue retrying without it. This implies
// reduced security on Windows versions older than Vista by allowing
// connections to this pipe from remote machines.
// Proper fix would increase the number of FFI imports and introduce
// significant amount of Windows XP specific code with no clean
// testing strategy
// For more info, see https://github.com/rust-lang/rust/pull/37677.
if handle == c::INVALID_HANDLE_VALUE {
let error = api::get_last_error();
if tries < 10 {
if error == WinError::ACCESS_DENIED {
continue;
} else if reject_remote_clients_flag != 0
&& error == WinError::INVALID_PARAMETER
{
reject_remote_clients_flag = 0;
tries -= 1;
continue;
}
if tries < 10 && error == WinError::ACCESS_DENIED {
continue;
} else {
return Err(io::Error::from_raw_os_error(error.code as i32));
}
return Err(io::Error::from_raw_os_error(error.code as i32));
}

ours = Handle::from_raw_handle(handle);
break;
}
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