Re: coredump when executing: echo -n <<< `cat <&1`

[Felipe Kellermann]

On Sun, 8 Feb 2004 3:16am  +0100, Daniel Berlin wrote:

> Bash Version: 2.05b
> Patch Level: 0
> Release Status: release
>
> Description:
>         when experimenting a bit, i noticed, that the following commandline
>         coredumps bash:
>         echo -n <<< `cat <&1`

        I have noticed this same problem some days ago with the here
strings (BTW, you won't get any output redirecting something to echo). I
noticed it fails just when expanding the command line with an here string
expanding to a zero-string:

        $ cat <<<A
        A
        $ cat <<<$undefinedvar
        Segmentation fault (core dumped)

        And here is the back trace:

#0  0x080901af in redirection_expand ()
#1  0x080904ae in redirection_expand ()
#2  0x08090be9 in redirection_expand ()
#3  0x08090093 in do_redirections ()
#4  0x0806b708 in setup_async_signals ()
#5  0x0806ac06 in execute_command_internal ()
#6  0x08067ef0 in execute_command_internal ()
#7  0x0806796f in execute_command ()
#8  0x0805d059 in reader_loop ()
#9  0x0805b420 in main ()
#10 0x40088b46 in __libc_start_main (main=0x805ad20 <main>, argc=1, 
ubp_av=0xbfffe314,
    init=0x805a160 <_init>, fini=0x80c0c40 <_fini>, rtld_fini=0x4000b240 
<_dl_fini>,
    stack_end=0xbfffe30c) at ../sysdeps/generic/libc-start.c:129

-- 
Felipe Kellermann