On no-so-small systems, it is possible for a single process to cause an OOM condition by filling large pipes with data that are never read. A typical process filling 4096 pipes with 1 MB of data will use 4 GB of memory. On small systems it may be tricky to set the pipe max size to prevent this from happening. The result is an OOM condition and oom-killer is not able to help much, as the memory for the pipe data is a kernel memory and a memory footprint of offensive processes is small. Upstream patch: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=759c01142a5d0f364a462346168a56de28a80f52 Discussion threads: https://www.spinics.net/lists/linux-fsdevel/msg92912.html | https://lkml.org/lkml/2015/12/28/150 https://www.spinics.net/lists/linux-fsdevel/msg93317.html | https://lkml.org/lkml/2016/1/11/310 https://www.spinics.net/lists/linux-fsdevel/msg93601.html | https://lkml.org/lkml/2016/1/18/171 CVE request and assignment: http://seclists.org/oss-sec/2016/q1/467 http://seclists.org/oss-sec/2016/q1/538
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1313433]
Acknowledgments: Name: Tetsuo Handa
Statement: This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5. This has been rated as having Moderate security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/. This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 6, 7 and MRG-2. Future Linux kernel updates for the respective releases might address this issue.
kernel-4.4.4-301.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
kernel-4.4.4-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2016:2574 https://rhn.redhat.com/errata/RHSA-2016-2574.html
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2016:2584 https://rhn.redhat.com/errata/RHSA-2016-2584.html
This issue has been addressed in the following products: Red Hat Enterprise Linux 7.2 Extended Update Support Via RHSA-2017:0217 https://rhn.redhat.com/errata/RHSA-2017-0217.html