Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-unknown-linux-gnu'
-DCONF_VENDOR='unknown' -DLOCALEDIR='/usr/local/share/locale' -DPACKAGE='bash'
-DSHELL -DHAVE_CONFIG_H -DDEBUG -DMALLOC_DEBUG -I. -I. -I./include -I./lib
-g -O2 -Wno-parentheses -Wno-format-security
uname output: Linux localhost.localdomain 4.7.0-0.rc7.git4.1.fc25.x86_64 #1 SMP
Mon Jul 18 15:59:11 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-unknown-linux-gnu
Bash Version: 4.4
Patch Level: 0
Release Status: rc2
Description:
Bash crashes while handling very long string in parameter expansion.
Repeat-By:
Configure bash to compile with '--with-bash-malloc=no' parameter and
install it :
> ./configure --with-bash-malloc=no
Generate file with very long string by executing below commands :
> for i in $(seq 0 1023); do echo -n .; done > data1k
> for i in $(seq 0 1023); do cat data1k; done > data1m
> for i in $(seq 0 1023); do cat data1m; done > data1g
Script to reproduce the crash :
> cat test.sh
#!/bin/bash
_INPUT_LOG_FILE=$1
echo "Starting..."
CMD="cat ${_INPUT_LOG_FILE}"
OUT=`${CMD} 2>&1`
echo "${CMD} completed..."
echo "Command Output : ${CMD} ${OUT}" > /dev/null
exit 1
Execute the script :
/usr/local/bin/bash test.sh data1g
Result:
Bash crashes with segmentation fault
--
--
Siteshwar Vashisht
