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Michael Weiß 016e3531d5 l2tp: Allow management of tunnels and session in user namespace 
[ Upstream commit 2abe05234f2e892728c388169631e4b99f354c86 ]

Creation and management of L2TPv3 tunnels and session through netlink
requires CAP_NET_ADMIN. However, a process with CAP_NET_ADMIN in a
non-initial user namespace gets an EPERM due to the use of the
genetlink GENL_ADMIN_PERM flag. Thus, management of L2TP VPNs inside
an unprivileged container won't work.

We replaced the GENL_ADMIN_PERM by the GENL_UNS_ADMIN_PERM flag
similar to other network modules which also had this problem, e.g.,
openvswitch (commit 4a92602aa1 "openvswitch: allow management from
inside user namespaces") and nl80211 (commit 5617c6cd6f "nl80211:
Allow privileged operations from user namespaces").

I tested this in the container runtime trustm3 (trustm3.github.io)
and was able to create l2tp tunnels and sessions in unpriviliged
(user namespaced) containers using a private network namespace.
For other runtimes such as docker or lxc this should work, too.

Signed-off-by: Michael Weiß <michael.weiss@aisec.fraunhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-04-21 09:04:44 +02:00
arch efi/x86: Fix the deletion of variables in mixed mode 2020-04-17 10:50:25 +02:00
block
certs
crypto
Documentation
drivers amd-xgbe: Use __napi_schedule() in BH context 2020-04-21 09:04:43 +02:00
fs hfsplus: fix crash and filesystem corruption when deleting files 2020-04-17 10:50:22 +02:00
include
init
ipc
kernel bpf: Fix tnum constraints for 32-bit comparisons 2020-04-17 10:50:25 +02:00
lib
LICENSES
mm
net l2tp: Allow management of tunnels and session in user namespace 2020-04-21 09:04:44 +02:00
samples
scripts
security
sound ASoC: stm32: sai: Add missing cleanup 2020-04-17 10:50:25 +02:00
tools perf tools: Support Python 3.8+ in Makefile 2020-04-17 10:50:21 +02:00
usr
virt
.clang-format
.cocciconfig
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Makefile Linux 5.4.33 2020-04-17 10:50:26 +02:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.