Date: Mon, 8 May 2000 17:26:45 +0900 (JST) From: mori@tri.asanuma.co.jp To: FreeBSD-gnats-submit@freebsd.org Subject: bin/18447: /bin/sh: wrong parse eval Message-ID: <200005080826.RAA68289@kurishna.tri.asanuma.co.jp>
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>Number: 18447
>Category: bin
>Synopsis: /bin/sh: wrong parse eval
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon May 08 04:40:02 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator: Koji Mori
>Release: FreeBSD 3.4-STABLE i386
>Organization:
>Environment:
FreeBSD kurishna.tri.asanuma.co.jp 3.4-STABLE FreeBSD 3.4-STABLE #26: Thu Apr 6 15:48:03 JST 2000 mori@kurishna.tri.asanuma.co.jp:/usr/src/sys/compile/KOTONE i386
>Description:
This problem is on /bin/sh.
If /bin/sh evaluates a string with `eval' statement and the string
has semicolon at the end, then /bin/sh doesn't process the `eval'
statement.
for example:
$ /bin/sh -c 'eval echo t'
t
$ /bin/sh -c 'eval echo t;'
$
or
$ cat test.sh
#! /bin/sh
cmd1='eval echo 1;'
cmd2='eval echo 2'
eval $cmd1
eval $cmd2
$ /bin/sh test.sh
2
$
And if the string has multiplue eval statement, then /bin/sh doesn't
process first eval statements, but processes others.
for example:
$ /bin/sh -c 'eval echo 1; eval echo 2; eval echo 3;'
2
3
$
I think its behavior is /bin/sh's bug. Other shells reading Bourne
shell script, such as bash or SunOS's /bin/sh, process all eval
statement for above cases. But NetBSD's /bin/sh is same as FreeBSD.
>How-To-Repeat:
Simple example is
$ /bin/sh -c 'eval echo 1; eval echo 2;'
The result is
2
but we expected
1
2
>Fix:
To fix, apply this patch to src/bin/sh/parser.c
diff -u -r1.30 parser.c
--- parser.c 2000/04/20 09:49:16 1.30
+++ parser.c 2000/04/29 01:22:14
@@ -137,6 +137,7 @@
{
int t;
+ tokpushback = 0;
doprompt = interact;
if (doprompt)
setprompt(1);
>Release-Note:
>Audit-Trail:
>Unformatted:
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