openai/codex · error

TokenUser size query returned 0

Error message

TokenUser size query returned 0

What it means

Error "TokenUser size query returned 0" thrown in openai/codex.

Source

Thrown at codex-rs/windows-sandbox-rs/src/token.rs:283

                std::ptr::read_unaligned(ln_buf.as_ptr() as *const TOKEN_LINKED_TOKEN);
            if lt.linked_token != 0 {
                let res = scan_token_groups_for_logon(lt.linked_token);
                CloseHandle(lt.linked_token);
                if let Some(v) = res {
                    return Ok(v);
                }
            }
        }
    }

    Err(anyhow!("Logon SID not present on token"))
}

unsafe fn get_user_sid_bytes(h_token: HANDLE) -> Result<Vec<u8>> {
    let mut needed: u32 = 0;
    GetTokenInformation(h_token, TokenUser, std::ptr::null_mut(), 0, &mut needed);
    if needed == 0 {
        return Err(anyhow!("TokenUser size query returned 0"));
    }
    let mut user_buf: Vec<u8> = vec![0u8; needed as usize];
    let ok = GetTokenInformation(
        h_token,
        TokenUser,
        user_buf.as_mut_ptr() as *mut c_void,
        needed,
        &mut needed,
    );
    if ok == 0 || (needed as usize) < std::mem::size_of::<TOKEN_USER>() {
        return Err(anyhow!(
            "GetTokenInformation(TokenUser) failed: {}",
            GetLastError()
        ));
    }
    let token_user: TOKEN_USER = std::ptr::read_unaligned(user_buf.as_ptr() as *const TOKEN_USER);
    let sid_len = GetLengthSid(token_user.User.Sid);
    if sid_len == 0 {

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/windows-sandbox-rs/src/token.rs:283 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of openai/codex@339751715c (2026-08-25). Data as JSON: /api/errors/ad9d30012e2ddcad. Report an issue: GitHub.