Skip to content

panic assert failed left: 4096 right: 0 - when sending > 4096 bytes in windows pipe message mode #6460

Open
tokio-rs/mio
#1778
@MolotovCherry

Description

@MolotovCherry

Version
1.37.0

Platform
Edition Windows 11 Pro
Version 23H2
Installed on ‎10/‎5/‎2022
OS build 22631.3296
Experience Windows Feature Experience Pack 1000.22687.1000.0

Description
Sending a message in the pipe larger than 4096 causes an assertion panic.

use tokio::{
    io::{AsyncReadExt as _, AsyncWriteExt},
    net::windows::named_pipe::{ClientOptions, ServerOptions},
    task,
};

#[tokio::main]
async fn main() {
    const BUFFER_SIZE: usize = 4096;

    const PIPE_NAME: &str = r"\\.\pipe\foobar";

    let h = task::spawn(async {
        let mut buf = vec![0; BUFFER_SIZE];

        loop {
            let mut server = ServerOptions::new()
                .access_inbound(true)
                .access_outbound(true)
                .reject_remote_clients(true)
                .pipe_mode(tokio::net::windows::named_pipe::PipeMode::Message)
                .in_buffer_size(BUFFER_SIZE as u32)
                .out_buffer_size(BUFFER_SIZE as u32)
                .create(PIPE_NAME)
                .unwrap();

            if server.connect().await.is_err() {
                continue;
            }

            _ = server.read(&mut buf).await.unwrap();
        }
    });

    let c = task::spawn(async {
        tokio::time::sleep(std::time::Duration::from_millis(50)).await;
        let mut client = ClientOptions::new().open(PIPE_NAME).unwrap();

        client.write_all(b"osrckodsjvetogpzljchmxgydobdxcvnuycomvmqigmdyhcwoviukhtugkdsrxvnjpiwvddlkaoxncdjosuyetvzymzywkpohlfvbascszryatuvycbuvuzhlnurwxwynjhvhuxjpsosvvtuqfynxnspzjblpjsjkbxfvwwehcxcloojqunfgltxivfsvzegellljmrzxfshatwfjpuoggvqhaclpvmsdbhjjpeamdxvzsmzzqaxpfygbcjmehgbvkrbjbhohvkwcjgbslhrhjblvdqnsjlqtliocomcbubzqxjtahgikfdhbqrrkllewwepdcwguccammwqwscxxndoxrtxaklizcazmeillcztrfkgmvajkpkuytgpaxinkarermlhartmmfnruyweebpmfefmawpdjayfdvupyrbngvdqekhgixpzmgnbfvxvlsxxngvozwkulyoyfwvoqgjijpwzjmmlnjesfamndspeofpfscgejgexyxzdxbyvxysftscenbqroocahwtqkyllxcbivecmoxrfbatnllhxwotapvnniiptcebdqbjchpkhgbqktemykczsatdsxzhtezeypdfwslonqjzcehfcloldoonjpcwufvullfmqlgymqrumeanyffaykakvcqimmrvqmjuahjjozrwgunwlstnhhgdxttamfeerecxzvrhkixjsviwyuihdvekbkucuipqqzekipwutbzofnumzcpflhskjneszjhsbhdtripilzprgcuemgvkvumldktiydmvlehmhvhxybubvsshhoydounbcxzzbqsiytlwdjrwuerhknkjjskjcohznmmbdfsrhyoijxtxeboppbcyvvmeyymlwlzqlnalbgaowlpdvldqagyukvyuuumyozkpbykcqlrbdhyyixaessdgpswepmwacaenioouvumztmwaoihjrxltmavktsduvvmiuytocjxxerndpyixkjfeoncbsgbllkxetmssrcjurccjcjfqwnfwejhxdmlielbfhhbanmozvbuudvdraydpfwgshspvimhvhsooporslglkcnlpjxsbnfndsdxejuyonlgzwakbjebeqmxchdwpdvnkymwmkbtohmxgvilyqckzlhtsbmlosemblxzivjhdchndvhxsbxnjsjsmcrbhyjsrengmgyxsrzkvrmgslwqwyvtacqpotcutsczdsmmbclwjlxvtcyrhwnteyirgmpwqkvehqazhtaqcixaafbiyjbptttjlcblamzbdribivcfimbgrzwdhvjjtjkxibpbvorecuuqpxsfpzxcurysqfczppsbubwaemvglubrncwbccorntogpxspcziabbsnciqehzkapjozxsujnkjepretcczzviiztonpojcswmbkfonsdzdefihvpixmvraepoyyrkzbdyppcdeivksvxfdlvgxpivpfhzlkbuhmxpozzqjbqvlgvxefqiurhspjblgxxeqcjmzhybrlwxcypifprgqkwbncumvqezijdnahyxnwowclohwhhoiyajsymlikvlzyftxcckjfqueodhyhibdpjmpfbqikqvvbpmllevtgimcteryhiqgugzvjwvlbztditseqgtfffkdwavavaqxfbaeehddgwuhktkyfzwrpahoqpmmmsgpkiehkxxwbommitjvinzyctmgurlakpysitavtfxdcbxyhthedegmdbcguugbwjmvukfzygylrbbvrpmwvffpwqttrdkgxsqhgcfqbqvcaednudmglpvcqqkxkbspvrmdntldejyskonznrpzluojqonocuqptqbifxfzbhjxpfatyobpfeocqpelayxotfmruepgmjjtkudfdbgnwpnvlgxpmkwjkxsnsnjkhqharpbuauuobzlqssqfzmtnsmydabkauxdqsthxjiifymagtsswythqhpptzljrtzajhdpgqhjcvobezzqwxzcxevnwscaoailhnppvovgvlakhwzlwuygpkgjhztsgdzfoavbysbacruhzdodipoyqvsuqmtjsjdqfapsqcnngqqfrqaykqmfnlwllcflddvatvwboaaychpgrfvelfzscjmchywakkichpedhrdqbrabslwuqrkofaomzfftaezchbddhqtemwdelhuvfoddfhdtkcshophgslwocghcuyoakfrjsuryicgruiqcllrnhmsnvbfkunyeuzwgqulplmdgvxirhafcmlxwpferuauecitaoxeqbsnmouskhypntxgdcznbppghqvuoeavsrrmdlevqmcgonmbbwgajewftwublgddjrmkmksicqzfitvtabrqovjjhdkryemzbqgqpyeicrndwvsqnaxilbqduwrrctjnbysmjdbqtpqptscztjjzdzzrlakosvoftspewclfkdjnakogmuhtzdmvzosgfbyudrtejjvoalspebaiaikqsslbxfnejpxclvvyvxzclzyhfjvzxprpmejhsxvaebgfzyqnfymybyukuawsouijaqdigvciqndnltkipivgnrnwnvsxihnxhmultkazeddyepsvysbgsnbmfsjaspehncokeyqmcprjqxvrlxoyduoabcakftxjvevlladzmfxvgndzgrfmbokwpkuxzpyqyoeevdicuxsbmtahwuiptqruvkjnuxrtsdjshckoluylzgbmqqjphhclblesgwvnxupulztpwpvjlqtehncmlhzijyhrmovbncxjisyywrrjczwxoycnhyyvbimtdzoixjocpyrwfzfpikteyfrcadhiqmlibpsnsphxksgxlcxxlrzmcczubixhtdoevlasnjcvxjyxyqfajdcpmfmnpxcpoizhxlfjynjcxrijnifyoguabidgkzxhdcqfnnmzzbxgbnzikejfaoogucovgjvlmohddjsubfofdarmzqzwyidsvzidcjwrmagscmzrfqbpbutqrtmlxfttiuywlhtznfhyogdfqtdvvvqoamldklleubwplhdncjsfnccincrnirfbcanthwiiibthxceissbelfurrvbfqonxsxjrwytjfweqwedvzrnizjcmxxpfrennqmdhxpkygdgicckvvoudorqcxmfdipiqtbmrncuwjhqhklercxqzscwfwmkswmxveiosskpizhoglbqpqwewzqwlkftcrrdfbtvrxspkligxpjjjmanlqspaqzseftecqimeullspepcqsztktaapyrhznwutjuqgjkdioueoixppxfnkktbfkyiqlaccastkjupqgvhmmiczadfrarhrwrekhfxwiufhpbhgaykyghltuhlrnosegrihiivnfhkxwjhewbtylfralhkawiazxmqgtewirwjtkavhdbizujklwrtoxatguiqgromiibhvyxoihwanrpryevvopzmtwogqwjrnwlezhrywctcgdouowuaxwdtngbglibbqvrcgqpkhplhpwniuetixppcpcsfwclkqbfwfgvtthqtjomtiolumvazlwgtlbpacilmgnknmdvzdhsannfoazlitsgjumouigmvywvwdsetozojhhbbajwdrienxgqxbbcjrxlwwshbinjjvjcnvgoxnkvppffkaljlvcoxokyazcfqgzxcastntssmuzayllzcnljapjgeygnxgxwjeydybnwkelqybaxtunnuuzcxslddihcrxgpjxbiescrygmxpmtwviwffypbnpgjmipmfaajdymaqggdscopyempytgcioqyjtbemyvdwkfdclfcessaqiepbavmiguxasnuydmpcyuhxiwyicpdwvqhpvzhpivnrgsrcsttjsisqdvdlgecaevqqdssazhchsbxbixzlpctmhsmicmlspczdoghocgioxjlkmkvxjgegmufchblogabsuigjzddcagqseowsnkvtbbatbrpibnyvincfmousmlpoosxzjyloddnyjxxviivpyxipcoinxywhbuaersyovypgt_overwrite").await.unwrap();
        client.write_all(b"some_data").await.unwrap();
    });

    h.await.unwrap();
    c.await.unwrap();
}

Output

   Compiling tester v0.1.0
    Finished dev [unoptimized + debuginfo] target(s) in 0.49s
     Running `R:\rust\debug\tester.exe`
thread 'tokio-runtime-worker' panicked at ~\.cargo\registry\src\index.crates.io-6f17d22bba15001f\mio-0.8.11\src\sys\windows\named_pipe.rs:881:17:
assertion `left == right` failed
  left: 4096
 right: 0
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
worker thread panicking; aborting process
error: process didn't exit successfully: `R:\rust\debug\tester.exe` (exit code: 0xc0000409, STATUS_STACK_BUFFER_OVERRUN)

Granted I'm not well versed in using pipes yet, so perhaps clients should only be send messages of max size MAX_BUF, but on the other hand, it's super easy for a client to crash the server this way
Edit: It's only a debug assert, won't crash in production

Metadata

Metadata

Assignees

No one assigned

    Labels

    A-tokioArea: The main tokio crateC-bugCategory: This is a bug.M-netModule: tokio/net

    Type

    No type

    Projects

    No projects

    Milestone

    No milestone

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions