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Re: bug in [ -f file ] test


From: László Házy
Subject: Re: bug in [ -f file ] test
Date: Thu, 28 Jul 2016 16:13:59 -0400

Yes, the can be overridden in /etc/sysctl.d. But I am going to modify the troublesome scripts in the $50k software and leave the security of the OS intact. Thanks.


On Thu, 2016-07-28 at 15:06 -0500, John McKown wrote:
On Thu, Jul 28, 2016 at 2:49 PM, László Házy <address@hidden> wrote:
[root]# cat /usr/lib/sysctl.d/50-default.conf | grep fs
fs.protected_hardlinks = 1
fs.protected_symlinks = 1


You can change those parameters in the file. Or you can do a test by doing:

sysctl -w fs.protected_hardlinks=0
sysctl -w fs.protected_symlinks=0


 


I guess this explains it. Problem is (my problem now) that it breaks the startup scripts of a $50000 software, which does work on an older FedoraCore. Is this a kernel problem then?

Thanks to all for your help.


On Thu, 2016-07-28 at 21:06 +0200, Piotr Grzybowski wrote:
 yeah, thats why I asked about version, but never mind that, Laszlo: I would like to see :

cat /usr/lib/sysctl.d/50-default.conf | grep fs

pg



On 28 Jul 2016, at 20:56, Charles Daffern wrote:

As far as I'm aware, the inability to use symlinks owned by another user in a sticky directory is a security feature of some kernels. It helps to prevent symlink attacks.




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Maranatha! <><
John McKown

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