1. Description of problem:

Using ksh across multiple versions of RHEL, customer reports that ksh scripts result in a segmentation fault when "." is in the PATH variable and a sub-process (pwd, ls, etc.) runs in a directory with a .paths sub-directory.

2. Version-Release number of selected component (if applicable):

Multiple versions of ksh (I used 20120801-143.el7_9)

3. How reproducible:

Always

4. Steps to Reproduce:

4.1. $ export PATH=${PATH}:.

4.2. $ vi crash.ksh

#!/bin/ksh

mkdir -p OK CRASH/.paths

echo "OK case: " 1>&2
ok=$(cd OK; pwd)
echo "OK case: pwd=${ok}" 1>&2

echo "crash case: " 1>&2
crash=$(cd CRASH; pwd)
echo "crash case: pwd=${crash}" 1>&2

4.3. $ chmod u+x crash.ksh

4.4. $ ./crash.ksh

5. Actual results:

OK case:
OK case: pwd=/../OK
crash case:
Segmentation fault

6. Expected results:

OK case:
OK case: pwd=/../OK
crash case:
crash case: pwd=/../CRASH

7. Additional info:

Customer reports that this occurs in multiple versions of RHEL, and therefore multiple versions of ksh. I performed a similar test in Fedora but did not encounter the reported problem.