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Panick when /proc is not mounted #26701

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mousetail opened this issue Nov 3, 2024 · 0 comments
Open

Panick when /proc is not mounted #26701

mousetail opened this issue Nov 3, 2024 · 0 comments
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@littledivy
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needs investigation requires further investigation before determining if it is an issue or not panic

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@mousetail
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This is a quite unusual setup, I'm aware.

I'm running deno using Bubblewrap:

    let mut command = Command::new("bwrap");
    command
        .args([
            "--ro-bind",
            "/bin",
            "/bin",
            "--chdir",
            "/",
            "--ro-bind",
            "/lib64",
            "/lib64",
            "--ro-bind",
            "/usr",
            "/usr",
            "--ro-bind",
            "/lib",
            "/lib",
            "--ro-bind",
            "/etc",
            "/etc",
            "--ro-bind",
            "/etc/alternatives",
            "/etc/alternatives",
            "--tmpfs",
            "/tmp",
            "--tmpfs",
            "/home/yq",
            "--setenv",
            "HOME",
            "/home/yq",
           "--unsare-all",
           "--new-session"
           "--setenv",
          "RUST_BACKTRACE",
          "1",
          "deno",
          "eval",
          "0"
        ]);

This hangs and shows the panic message:
image
(Note even with RUST_BACKTRACE=1 set it doesn't print a backtrace)

I ran it through strace to try to figure out what is going on, this was the output:

mousetail@DESKTOP-K0SID88:~/pypro$ strace ./deno eval 0 2>&1 | grep open
...
openat(AT_FDCWD, "/proc/self/maps", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/home/mousetail/pypro/deno", O_RDONLY|O_CLOEXEC) = 9
openat(AT_FDCWD, "/sys/devices/system/cpu/online", O_RDONLY|O_CLOEXEC) = 9
openat(AT_FDCWD, "/dev/urandom", O_RDONLY) = 9
...

What is interesting is that it works fine if I mount a dummy file in /proc but don't mount /sys it seems to work fine, even though it seems to only be loading proc to find the file in /sys to open.

It's not a huge deal to mount a fake /proc but it seems you consider any panic a bug so I'm reporting it just so you are aware.
@bartlomieju bartlomieju added needs investigation requires further investigation before determining if it is an issue or not panic labels Nov 4, 2024
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@mousetail @bartlomieju @littledivy