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Daniel Colascione 1ae80cf319 bpf: wait for running BPF programs when updating map-in-map
The map-in-map frequently serves as a mechanism for atomic
snapshotting of state that a BPF program might record.  The current
implementation is dangerous to use in this way, however, since
userspace has no way of knowing when all programs that might have
retrieved the "old" value of the map may have completed.

This change ensures that map update operations on map-in-map map types
always wait for all references to the old map to drop before returning
to userspace.

Signed-off-by: Daniel Colascione <dancol@google.com>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-10-12 19:32:19 -07:00
arch
block
certs
crypto
Documentation Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2018-10-08 23:42:44 -07:00
drivers Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2018-10-08 23:42:44 -07:00
firmware
fs
include Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2018-10-08 23:42:44 -07:00
init
ipc
kernel bpf: wait for running BPF programs when updating map-in-map 2018-10-12 19:32:19 -07:00
lib Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2018-10-08 23:42:44 -07:00
LICENSES
mm
net net: fix generic XDP to handle if eth header was mangled 2018-10-09 21:59:09 -07:00
samples
scripts
security
sound
tools selftests: bpf: install script with_addr.sh 2018-10-11 10:35:45 +02:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
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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.
See Documentation/00-INDEX for a list of what is contained in each file.

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.