linux-kernel - Re: execve for script don't return ENOEXEC, bug ?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4BA49864.7080503@davidnewall.com>
Date:	Sat, 20 Mar 2010 20:11:56 +1030
From:	David Newall <davidn@...idnewall.com>
To:	Valery Reznic <valery_reznic@...oo.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: execve for script don't return ENOEXEC, bug ?

Valery Reznic wrote:
> [valery@...alhost ~]$ cat a.sh 
> #!/bin/sh
> echo "It's a.sh"
> [valery@...alhost ~]$ cat b.sh 
> #! ./a.sh
> echo "It's b.sh"
> [valery@...alhost ~]$ 
> [valery@...alhost ~]$ strace -f -e execve setarch i386 ./b.sh 
> execve("/usr/bin/setarch", ["setarch", "i386", "./b.sh"], [/* 40 vars */]) = 0
> execve("./b.sh", ["./b.sh"], [/* 40 vars */]) = 0
> It's a.sh
>   

That is the correct output for a script which is being interpreted by 
a.sh, when a.sh prints "It's a.sh" using /bin/sh as its interpreter.  
Remember, you didn't ask /bin/sh to interpret b.sh, you asked a.sh to do 
it, and a.sh is a simple echo statement, not an interpreter.  There is 
no error here.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/