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Re: [Fwd: Obscure problem with Bash when printing]

From: Francis Litterio
Subject: Re: [Fwd: Obscure problem with Bash when printing]
Date: Mon, 21 Jul 2003 09:36:46 -0400
User-agent: Gnus/5.1002 (Gnus v5.10.2) Emacs/21.3 (windows-nt)

James Richard Tyrer wrote:

>> While this is an obscure problem.  It is a very serious bug since Bash does
>> not correctly set HOME to match the user as reported by:
>>     id -un
> I thought that I should clarify that this ONLY happens when the LPR daemon
> (which is running as root) calls the filter script (as the user that submitted
> the job) that HOME is not correctly set to the: "passwd" file entry for the
> user.

An examination of the source code (file variables.c) shows that Bash
sets HOME only if it's not already in the environment:

    /* Set $HOME to the information in the password file if we didn't get
       it from the environment. */


    static void
    set_home_var ()
      SHELL_VAR *temp_var;

      temp_var = find_variable ("HOME");
      if (temp_var == 0)
        temp_var = bind_variable ("HOME", sh_get_home_dir ());
    #if 0
      VSETATTR (temp_var, att_exported);

Thus, it is the LPR daemon that is not changing HOME before exec'ing the
filter script.

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