ksh/SOURCES/ksh-20120801-segfault-strdup.patch

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Diff

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
---
src/cmd/ksh93/edit/history.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/cmd/ksh93/edit/history.c b/src/cmd/ksh93/edit/history.c
index de5e4a8..222d4bc 100644
--- a/src/cmd/ksh93/edit/history.c
+++ b/src/cmd/ksh93/edit/history.c
@@ -395,7 +395,8 @@ retry:
if(fd>=0)
{
fcntl(fd,F_SETFD,FD_CLOEXEC);
- hp->tty = strdup(ttyname(2));
+ const char* tty = ttyname(2);
+ hp->tty = strdup(tty?tty:"notty");
hp->auditfp = sfnew((Sfio_t*)0,NULL,-1,fd,SF_WRITE);
}
}
--
2.43.0