From: Chet Ramey <chet.ramey@case.edu>
To: "Greg Wooledge" <wooledg@eeg.ccf.org>, "Ludovic Courtès" <ludo@gnu.org>
Cc: 22354@debbugs.gnu.org, bug-bash@gnu.org, chet.ramey@case.edu
Subject: bug#22354: Hash-bang line length
Date: Wed, 13 Jan 2016 11:23:34 -0500 [thread overview]
Message-ID: <56967A06.8040104__25967.2860535376$1452710382$gmane$org@case.edu> (raw)
In-Reply-To: <20160113140441.GZ27325@eeg.ccf.org>
On 1/13/16 9:04 AM, Greg Wooledge wrote:
> On Wed, Jan 13, 2016 at 02:52:08PM +0100, Ludovic Courtès wrote:
>> Sure, but the fact that it???s smaller than that of the kernel Linux is
>> problematic: when a hash-bang line > 127 chars is encountered, ???execve???
>> fails with ENOENT, so Bash???s fallback code is executed, fails as well,
>> but it prints a misleading error message with an even more truncated
>> hash-bang line.
>
> Let's suppose bash is changed to read a shebang line of unlimited length.
> In your scenario, the script with the 150 character shebang fails at the
> kernel level with ENOENT, so bash's fallback code runs, and the script
> is executed by a new instance of bash.
No, it isn't. The execve fails with ENOENT, so bash just prints an error
message containing the interpreter name, which Ludo is reporting is
truncated.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/
next prev parent reply other threads:[~2016-01-13 16:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <87lh7t7p4w.fsf@gnu.org>
2016-01-13 13:19 ` bug#22354: Hash-bang line length Greg Wooledge
[not found] ` <20160113131902.GU27325@eeg.ccf.org>
2016-01-13 13:52 ` Ludovic Courtès
[not found] ` <87y4bt60zb.fsf@gnu.org>
2016-01-13 14:04 ` Greg Wooledge
2016-01-13 16:21 ` Chet Ramey
[not found] ` <20160113140441.GZ27325@eeg.ccf.org>
2016-01-13 16:23 ` Chet Ramey [this message]
[not found] ` <56967A06.8040104@case.edu>
2016-01-13 16:39 ` Greg Wooledge
[not found] ` <56967976.2080908@case.edu>
2016-01-13 17:41 ` Ludovic Courtès
[not found] ` <87vb6x2x7u.fsf@gnu.org>
2016-01-13 20:47 ` Chet Ramey
2016-01-13 16:18 ` Chet Ramey
2016-01-12 9:14 bug#22354: Test failure when running distcheck from out-of-tree build Taylan Ulrich Bayırlı/Kammer
2016-01-13 10:25 ` bug#22354: Hash-bang line length Ludovic Courtès
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