fix segfault in subshell if $PATH contains a .paths directory

Resolves: RHEL-12011

ksh-20120801-segfault-cd-paths.patch

@@ -0,0 +1,55 @@
+From 035a4cb3f453271b7ae63bcb53a7963b8dbe4c41 Mon Sep 17 00:00:00 2001
+From: Anuradha Weeraman <anuradha@weeraman.com>
+Date: Thu, 2 Jul 2020 18:29:07 -0400
+Subject: [PATCH] Fix segfault if $PATH contains a .paths directory (#55)
+
+ksh crashed if it encountered a .paths directory in any of the
+directories in $PATH.
+
+Ref: https://bugs.launchpad.net/ubuntu/+source/ksh/+bug/1534855
+
+src/cmd/ksh93/sh/path.c: path_chkpaths():
+- Refuse to read .paths if it's not a regular file
+  or a symlink to a regular file.
+
+Upstream-commit: 035a4cb3f453271b7ae63bcb53a7963b8dbe4c41
+Cherry-picked-by: Lukáš Zaoral <lzaoral@redhat.com>
+---
+ src/cmd/ksh93/sh/path.c         | 4 ++++
+ src/cmd/ksh93/tests/path.sh     | 9 +++++++++
+ 2 files changed, 13 insertions(+)
+
+diff --git a/src/cmd/ksh93/sh/path.c b/src/cmd/ksh93/sh/path.c
+index 213a2a6c7375..25ade4073dad 100644
+--- a/src/cmd/ksh93/sh/path.c
++++ b/src/cmd/ksh93/sh/path.c
+@@ -1507,6 +1507,10 @@ static int path_chkpaths(Shell_t *shp,Pathcomp_t *first, Pathcomp_t* old,Pathcom
+ 	if((fd=open(stakptr(offset),O_RDONLY))>=0)
+ 	{
+ 		fstat(fd,&statb);
++		if (!S_ISREG(statb.st_mode)) {
++			close(fd);
++			return 0;
++		}
+ 		n = statb.st_size;
+ 		stakseek(offset+pp->len+n+2);
+ 		sp = stakptr(offset+pp->len);
+diff --git a/src/cmd/ksh93/tests/path.sh b/src/cmd/ksh93/tests/path.sh
+index c9d8d2485e28..9725c74e31ea 100755
+--- a/src/cmd/ksh93/tests/path.sh
++++ b/src/cmd/ksh93/tests/path.sh
+@@ -408,5 +408,14 @@ END
+ END
+ ) || err_exit '${.sh.xxx} variables causes cat not be found'
+ 
++# ksh segfaults if $PATH contains a .paths directory
++mkdir -p $tmp/paths-dir-crash/
++cat > $tmp/paths-dir-crash/run.sh <<- EOF
++mkdir -p $tmp/paths-dir-crash/.paths
++export PATH=$tmp/paths-dir-crash:$PATH
++print ok
++EOF
++[[ $($SHELL $tmp/paths-dir-crash/run.sh 2>/dev/null) == ok ]] || err_exit "ksh crashes if PATH contains a .paths directory"
++
+ exit $((Errors<125?Errors:125))
+ 

ksh.spec

@@ -6,7 +6,7 @@ Summary:      The Original ATT Korn Shell
 URL:          http://www.kornshell.com/
 License:      EPL-1.0
 Version:      %{releasedate}
-Release:      261%{?dist}
+Release:      262%{?dist}
 Source0:      http://www.research.att.com/~gsf/download/tgz/ast-ksh.%{release_date}.tgz
 Source1:      http://www.research.att.com/~gsf/download/tgz/INIT.%{release_date}.tgz
 Source2:      kshcomp.conf
@@ -244,6 +244,10 @@ Patch95: ksh-20120801-set+r-fix.patch
 # upstream commit: https://github.com/ksh93/ksh/commit/9a9da2c299a0adcd36b4efd1b1c0ee2883beba7b.patch
 Patch96: ksh-20120801-segfault-strdup.patch
 
+# RHEL-12011
+# upstream commit: https://github.com/ksh93/ksh/commit/035a4cb3f453271b7ae63bcb53a7963b8dbe4c41
+Patch97: ksh-20120801-segfault-cd-paths.patch
+
 Conflicts:    pdksh
 Requires: coreutils, diffutils, chkconfig
 BuildRequires: bison
@@ -397,6 +401,10 @@ fi
 %config(noreplace) %{_sysconfdir}/binfmt.d/kshcomp.conf
 
 %changelog
+* Wed Nov 08 2023 Lukáš Zaoral <lzaoral@redhat.com> - 20120801-262
+- fix segfault in subshell if $PATH contains a .paths directory
+  Resolves: RHEL-12011
+
 * Tue Oct 31 2023 Lukáš Zaoral <lzaoral@redhat.com> - 20120801-261
 - Fix segfault in strdup
   Resolves: RHEL-11982