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fix use of strdup on a NULL pointer

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Resolves: RHEL-11982
This commit is contained in:
Lukáš Zaoral 2024-02-09 10:10:33 +01:00
parent d229cb622e
commit 55ccbd1c4a
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2 changed files with 69 additions and 1 deletions
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62
ksh-1.0.8-fix-strdup-on-null.patch Normal file
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@ -0,0 +1,62 @@
From 9eb8532ccacf1cfdb7ba18f51eba68776852ef7c Mon Sep 17 00:00:00 2001
From: Vincent Mihalkovic <vmihalko@redhat.com>
Date: Thu, 8 Feb 2024 22:10:58 +0100
Subject: [PATCH] Re-fix use of strdup on a NULL pointer (re: 9a9da2c2) (#718)
Thank you @lzaoral for debugging this issue and creating this
reproducer:
$ tty # check that the shell is connected to a pseudoterminal
/dev/pts/4
$ mkdir /var/tmp/chroottest
$ dnf --releasever=39 --installroot=/var/tmp/chroottest install ksh
$ echo "/dev/udp/127.0.0.1/514;0;104" |
sudo tee /var/tmp/chroottest/etc/ksh_audit
$ sudo chroot /var/tmp/chroottest /bin/ksh -lic 'exit 0'
(ksh segfaults)
Analysis: On Linux, ttyname(3)[*] may fail if:
* EBADF Bad file descriptor.
* ENODEV fd refers to a slave pseudoterminal device but the
corresponding pathname could not be found [...].
* ENOTTY fd does not refer to a terminal device.
Calling isatty(3) before ttyname(3) only prevents the first and
third cases.
src/cmd/ksh93/edit/history.c: sh_histinit():
- To catch the second case, let's call ttyname(2) directly, check
for NULL and remove the redundant isatty() call.
[*] https://man7.org/linux/man-pages/man3/ttyname.3.html
Cherry-picked-by: Lukáš Zaoral <lzaoral@redhat.com>
Upstream-commit: 9eb8532ccacf1cfdb7ba18f51eba68776852ef7c
---
src/cmd/ksh93/edit/history.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/src/cmd/ksh93/edit/history.c b/src/cmd/ksh93/edit/history.c
index a7b084e5c16f..25832a59265b 100644
--- a/src/cmd/ksh93/edit/history.c
+++ b/src/cmd/ksh93/edit/history.c
@@ -15,6 +15,7 @@
* Johnothan King <johnothanking@protonmail.com> *
* hyenias <58673227+hyenias@users.noreply.github.com> *
* Govind Kamat <govind_kamat@yahoo.com> *
+* Vincent Mihalkovic <vmihalko@redhat.com> *
* *
***********************************************************************/
/*
@@ -353,7 +354,8 @@ int sh_histinit(void)
if(fd>=0)
{
fcntl(fd,F_SETFD,FD_CLOEXEC);
- hp->tty = sh_strdup(isatty(2)?ttyname(2):"notty");
+ const char* tty = ttyname(2);
+ hp->tty = sh_strdup(tty?tty:"notty");
hp->auditfp = sfnew(NULL,NULL,-1,fd,SF_WRITE);
}
}

8
ksh.spec
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@ -4,12 +4,15 @@ URL: http://www.kornshell.com/
License: EPL-2.0
Epoch: 3
Version: 1.0.8
Release: 3%{?dist}
Release: 4%{?dist}
Source0: https://github.com/ksh93/%{name}/archive/v%{version}/%{name}-%{version}.tar.gz
Source1: kshcomp.conf
Source2: kshrc.rhs
Source3: dotkshrc
# Re-fix use of strdup on a NULL pointer (RHEL-11982)
Patch1: ksh-1.0.8-fix-strdup-on-null.patch
Conflicts: pdksh
Requires: coreutils, diffutils
BuildRequires: gcc
@ -138,6 +141,9 @@ fi
%config(noreplace) %{_sysconfdir}/binfmt.d/kshcomp.conf
%changelog
* Fri Feb 09 2024 Lukáš Zaoral <lzaoral@redhat.com> - 3:1.0.8-4
- fix use of strdup on a NULL pointer (RHEL-11982)
* Thu Jan 25 2024 Fedora Release Engineering <releng@fedoraproject.org> - 3:1.0.8-3
- Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild