[debbugs-tracker] bug#24276: closed (head without pipline is not reading complete STDIN, resulting in unwilling and unexpected command execution)

[GNU bug Tracking System]

Your message dated Sat, 20 Aug 2016 17:12:36 -0700
with message-id <address@hidden>
and subject line Re: bug#24276: head without pipline is not reading complete 
STDIN, resulting in unwilling and unexpected command execution
has caused the debbugs.gnu.org bug report #24276,
regarding head without pipline is not reading complete STDIN, resulting in 
unwilling and unexpected command execution
to be marked as done.

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-- 
24276: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=24276
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> --- Begin Message ---
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> Subject: 
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> head without pipline is not reading complete STDIN, resulting in unwilling and unexpected command execution
>
>
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> Date: 
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> Sat, 20 Aug 2016 23:01:07 +0200
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> User-agent: 
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> Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2
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>
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>
> hi,
>
> while comparing my rewrite in google go of coreutils i noticed that head 
> without pipeline
> is not reading complete STDIN:
>
> > head -c 2
>
> enter:
>
> > asdf
>
> press return
>
> this results in printing "as" and execution of the df command. thats highly 
> unexpected and 
> probably a good example for a variant of WYSINWYC (What you see is not what you 
> copy)*.
> someone might even come up with a not harmful looking code, that is harmful 
> (heredoc?).
>
> > head --version
> > head (GNU coreutils) 8.25
>
> > bash --version
> > GNU bash, version 4.3.46(1)-release (x86_64-suse-linux-gnu)
>
> > uname -o
> > GNU/Linux
>
> > printfile /etc/os-release
> > NAME=openSUSE
> > VERSION="Tumbleweed"
> > VERSION_ID="20160811"
> > PRETTY_NAME="openSUSE Tumbleweed (20160811) (x86_64)"
> > ID=opensuse
> > ANSI_COLOR="0;32"
> > CPE_NAME="cpe:/o:opensuse:opensuse:20160811"
> > BUG_REPORT_URL="https://bugs.opensuse.org";
> > HOME_URL="https://www.opensuse.org/";
>
> * 
> http://www.ush.it/team/ascii/hack-tricks_253C_CCC2008/wysinwyc/what_you_see_is_not_what_you_copy.txt
>
> -- 
> Sebastian Kratz
> @ProhtMeyhet
>
>
>
> --- End Message ---
> --- Begin Message ---
>
>
>
> Subject: 
>
> Re: bug#24276: head without pipline is not reading complete STDIN, resulting in unwilling and unexpected command execution
>
>
>
>
> Date: 
>
> Sat, 20 Aug 2016 17:12:36 -0700
>
>
>
>
> User-agent: 
>
> Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0
>
>
>
>
> This is not a bug. It's quite OK for 'head' to read just as much input as is 
> required, and to not bother to read the rest of input. In fact, POSIX requires 
> this behavior if standard input is a seekable file. See:
>
> http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap01.html
>
> and look for "seekable input".
>
>
>
> --- End Message ---