lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <CALAqxLVCpyKzGJPVtBuipnZbGbDC_Z0rPBrn-J2mkMsQsSvdtA@mail.gmail.com>
Date:   Tue, 12 Jun 2018 15:40:41 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Thomas Richter <tmricht@...ux.ibm.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: REGRESSION?: debugfs: inode: debugfs_create_dir uses mode permission
 from parent

Hey all,
  I noticed recently that linus/master (plus patches) stopped booting
to UI on HiKey960, and I bisected the issue down to:
92170b62f1c1 ("debugfs: inode: debugfs_create_dir uses mode permission
from parent")

On the HiKey960 board, we mount debugfs via:
   mount debugfs /sys/kernel/debug /sys/kernel/debug mode=755

But since the change, it seems most of the nodes in /sys/kernel/debug
are: drwx------

Which ends up breaking the egl library, keeping it from loading.

This seems to be the expected behavior of the patch, but I'm surprised
the mode override is now ignored. It seems like the potential fix here
would be to set the /sys/kernel/debug dir to 755 prior to mounting? Or
is there some other advised solution?

thanks
-john

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ