From: Maximilian Krüger <max@maxfragg.de>
Date: Wed, 11 Nov 2020 10:21:30 +0000 (+0100)
Subject: Use O_CLOEXEC in sysconf [BZ #26791]
X-Git-Tag: glibc-2.33~317
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d2d714b9fc02e4710d6dc769d8ec2c9dab0eb69a;p=thirdparty%2Fglibc.git

Use O_CLOEXEC in sysconf [BZ #26791]

If sysconf is used in multithreaded processes, various filedescriptors
may leak due to missing O_CLOEXEC.  This commit adds the flag.
---

diff --git a/sysdeps/unix/sysv/linux/sysconf.c b/sysdeps/unix/sysv/linux/sysconf.c
index 7958a74164e..9c5a4cb1a4d 100644
--- a/sysdeps/unix/sysv/linux/sysconf.c
+++ b/sysdeps/unix/sysv/linux/sysconf.c
@@ -81,7 +81,7 @@ __sysconf (int name)
 
   if (procfname != NULL)
     {
-      int fd = __open_nocancel (procfname, O_RDONLY);
+      int fd = __open_nocancel (procfname, O_RDONLY | O_CLOEXEC);
       if (fd != -1)
 	{
 	  /* This is more than enough, the file contains a single integer.  */