Fixed
Created: Mar 31, 2015
Updated: Dec 3, 2018
Resolved Date: Apr 27, 2015
Found In Version: 6.0
Fix Version: 6.0.0.20
Severity: Standard
Applicable for: Wind River Linux 6
Component/s: Userspace
Bug-Description:
If a SIGWINCH arrives while bash is performing redisplay, multi-line prompts are displayed incorrectly due to the display code being called recursively.
http://ftp.gnu.org/gnu/bash/bash-4.0-patches/bash40-020
PACKAGE NAME: bash
PACKAGE VERSION: 3.2.48
LICENSE: GPLv2+
Description of the issue:
On some cold boots the X server would die almost immediately after boot. Also, a core dump was produced by the bash process running inside the rxvt terminal inside of X. The core dump trace back pointed to a known issue in bash that has since been fixed in bash 4.0. The issue involves the bash process receiving a SIGWINCH signal from its parent at just the right time, causing a recursive call into a function (rl_redisplay). This call can sometimes lead to segmentation faults because the function access static module data in a way which is not safe for reentrancy. The patch adds a simple semaphore around the call to prevent this reentrancy.
