CODEWITHSUNDEEP
javalinuxubuntu
ljf
ljf

Reputation: 65

Java program can't execute file it writes to /tmp, no such file or directory

I am running into trouble with a java program, which attempts to write files to the /tmp directory on Ubuntu 18.10. It runs into errors as it can not write the temporary file it expects. It fails for error 2: No such file or directory. The privileges on /tmp are default.

I have read this is not a problem with Windows or Mac OS for the reason that it would not be restricted in this way.

How do I solve this? Should I configure my system differently (preferred) or alter the code?

Edit:

The file in question is actually created, permissions are -rwxrwxr-x 1 lucas lucas 51263 Apr 26 11:12 monalisa13902330713449850714bin*

However, the the program cannot find it:

monalisa.tools.tinv.TInvariantCalculator$InvokeProcessException: java.io.IOException: Cannot run program "/tmp/monalisa13902330713449850714bin" (in directory "/tmp"): error=2, No such file or directory

The /tmp directory is determined correctly by File(System.getProperty("java.io.tmpdir"));

The file is created here: 

    toolFile = FileUtils.extractResource("tinv_unix", "monalisa", "bin");

    public static File extractResource(URL resource, String prefix,
            String suffix) throws IOException {
        LOGGER.debug("Extracting resource '" + resource.toString() + "'");
        File file = File.createTempFile(prefix, suffix);
        file.setExecutable(true, false);

Running exec /tmp/[file name] returns the same error.

Edit: result of ´strace -e stat,execve -f bash -c /tmp/monalisa1846113800189529428bin´

`

execve("/bin/bash", ["bash", "-c", "/tmp/monalisa1846113800189529428"...], 0x7ffdb3fa2b68 /* 59 vars */) = 0
stat("/home/lucas", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
stat(".", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
stat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
stat("/home/lucas", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
stat(".", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
stat("/tmp/bin/bash", 0x7ffdd5b7b7d0)   = -1 ENOENT (No such file or directory)
stat("/usr/local/sbin/bash", 0x7ffdd5b7b7d0) = -1 ENOENT (No such file or directory)
stat("/usr/local/bin/bash", 0x7ffdd5b7b7d0) = -1 ENOENT (No such file or directory)
stat("/usr/sbin/bash", 0x7ffdd5b7b7d0)  = -1 ENOENT (No such file or directory)
stat("/usr/bin/bash", 0x7ffdd5b7b7d0)   = -1 ENOENT (No such file or directory)
stat("/sbin/bash", 0x7ffdd5b7b7d0)      = -1 ENOENT (No such file or directory)
stat("/bin/bash", {st_mode=S_IFREG|0755, st_size=1121696, ...}) = 0
stat("/bin/bash", {st_mode=S_IFREG|0755, st_size=1121696, ...}) = 0
stat("/bin/bash", {st_mode=S_IFREG|0755, st_size=1121696, ...}) = 0
stat("/bin/bash", {st_mode=S_IFREG|0755, st_size=1121696, ...}) = 0
stat("/bin/bash", {st_mode=S_IFREG|0755, st_size=1121696, ...}) = 0
stat("/bin/bash", {st_mode=S_IFREG|0755, st_size=1121696, ...}) = 0
execve("/tmp/monalisa1846113800189529428bin", ["/tmp/monalisa1846113800189529428"...], 0x55d86a4d0960 /* 59 vars */) = -1 ENOENT (No such file or directory)
stat("/tmp/monalisa1846113800189529428bin", {st_mode=S_IFREG|0744, st_size=51263, ...}) = 0
stat("/tmp/monalisa1846113800189529428bin", {st_mode=S_IFREG|0744, st_size=51263, ...}) = 0
stat("/tmp/monalisa1846113800189529428bin", {st_mode=S_IFREG|0744, st_size=51263, ...}) = 0
stat("/tmp/monalisa1846113800189529428bin", {st_mode=S_IFREG|0744, st_size=51263, ...}) = 0
bash: /tmp/monalisa1846113800189529428bin: No such file or directory
+++ exited with 127 +++`

Upvotes: 0

Views: 2828

Answers (2)

Jo Engineer
Jo Engineer

Reputation: 1

a solution to run a java program with no execution right in /tmp is to redirect java to another folder with the option -Djava.io.tmpdir=[PATH_TO_FOLDER_YOU_CAN_EXECUTE]

Upvotes: 0

user3486184
user3486184

Reputation: 2375

I would bet that your /tmp directory is mounted as noexec - which means you're not able to execute any program there.

Possible solutions: write to somewhere else (user's home directory perhaps?) or remove noexec from /etc/fstab for /tmp and remount - but be sure you understand what that implies before you do so.

Upvotes: 3

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