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Date: Mon, 29 Sep 2014 19:55:42 +0200
From: Florian Weimer <fweimer@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Re: Array importing in bash 4.3
On 09/29/2014 05:47 PM, Kobrin, Eric wrote:
> This code also reveals a difference from the function export code.
>
> The ARRAY_EXPORT code frees temp_string after using it. The function export code mallocs, but never frees it. That behavior predates the recent patches.
That's because parse_and_execute takes ownership of the string by
default. See the comment in builtins/evalstring.c:
/* Parse and execute the commands in STRING. Returns whatever
execute_command () returns. This frees STRING. FLAGS is a
flags word; look in common.h for the possible values. Actions
are:
(flags & SEVAL_NONINT) -> interactive = 0;
(flags & SEVAL_INTERACT) -> interactive = 1;
(flags & SEVAL_NOHIST) -> call bash_history_disable ()
(flags & SEVAL_NOFREE) -> don't free STRING when finished
(flags & SEVAL_RESETLINE) -> reset line_number to 1
*/
--
Florian Weimer / Red Hat Product Security
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