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| -rw-r--r-- | 0000-cover-letter.patch | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/0000-cover-letter.patch b/0000-cover-letter.patch new file mode 100644 index 00000000000000..7c83ade60e1b7e --- /dev/null +++ b/0000-cover-letter.patch @@ -0,0 +1,268 @@ +Subject: [PATCH 00/12] Add kdbus implementation + +kdbus is a kernel-level IPC implementation that aims for resemblance to +the the protocol layer with the existing userspace D-Bus daemon while +enabling some features that couldn't be implemented before in userspace. + +The documentation added by the first patch in this series is meant to +explain all protocol and API details comprehensively, but here's a terse +list of the kdbus key features: + + * Implemented as a char driver, which creates devices on demand when + they are created. + + * Message transfer over shared memory areas in each of the peer's + task to avoid unnecessary extra data copies during message exchanges. + + * Optional passing of file descriptors and sealed memfds along with + messages. + + * No demarshalling of any message content from inside the kernel; + the driver stays entirely agnostic to the transported payload. + + * Support for multiple domains, completely separated from each other, + allowing multiple virtualized instances to be used at the same time. + + * Support for peer-to-peer unicast and multicast messages. + + * Attachment of trustable metadata to each message on demand, such as + the sending peer's timestamp, creds, auxgroups, comm, exe, cmdline, + cgroup path, capabilities, security label, audit information, etc, + each taken at the time the sender issued the ioctl to send the + message. Which of those are actually recorded and attached is + controlled by the receiving peer. + + * Bloom filters as measure to pre-filter broadcast messages and to + mitigate unnecessary task wakeups. On the side kernel, however, this + is just a cheap &-operation, hash functions are left to be + implemented by userspace. + + * Optional message dequeuing by priority, allowing multiple types of + payloads of different priorities to be transported over the same + connection. + + * Global, domain-wide guaranteed message ordering. + + * Eavesdropping for buses for debugging + + * Adressing of remote peers by their numerical unique ID, or by a + well-known name. + + * Built-in name registry for atomic name ownership lookups, claims, + releases and take-overs from one peer to another. + + * Simple policy database to restrict peers from seeing or talking to + each other, and to control name ownership. + + * Custom bus endpoints in addition to the default ones. Those allow + to upload extra policy rules, and can act as a protocol-filtering + bus firewall. + + * Kernel-generated notifications on connected and disconnected peers, + claimed and released well-known-names, and exceeded reply timeouts. + +This is the first submission of kdbus by the kernel community. It was +developed in its own repository for well more than a year, and has been +tested on x64-64, i686 and ARM architectures in various use cases. The +driver is totally non-intrusive and doesn't touch a single line of +existing kernel code. + +kdbus has been worked on collaboratively by many people contributing +code and suggestions during its development. Below is a list of all +involved individuals, in alphabetical order. + + Alban Crequy, Arnd Bergmann, Christian S., Daniel Kowalski, + Daniel Mack, David Herrmann, Djalal Harouni, Govindarajulu + Varadarajan, Greg Kroah-Hartman, Harald Hoyer, Hristo Venev, + Ingo van Lil, Jacek Janczyk, Jason A. Donenfeld, John de + la Garza, Kay Sievers, Lennart Poettering, Lukasz Skalski, + Maciej Wereski, Marc-Antoine Perennou, Marcel Holtmann, + Michal Eljasiewicz, Michele Curti, Przemyslaw Kedzierski, + Radoslaw Pajak, Ryan Lortie, Simon McVittie, Simon Peeters, + Stefan Beller, Ted Feng, Tejun Heo, Tero Roponen, Thomas + Andersen, Torstein Husebø, Vasiliy Balyasnyy. + +Some statistics: the driver itself has a little more than 11k lines, +with ~25% of the lines being comments. Our test suite weights in for +another 6k lines, and the API documentation file currently has >1800 +lines. The loaded kernel module has ~70kB of text size. + +Patches #3 to #10 carry the driver implementation in digestable bites, +but only #11 adds the Makefile to actually compile them. That division +can of course be changed, and the patches be squashed and reordered +later. + +The rest should be pretty much self-explanatory - the individual commit +logs and Documentation/kdbus.txt contain detailed information on the +driver's inner life. + +While we consider the kernel API/ABI mostly stable at this point, we're +still in the process of fixing up some ends in userspace, such as +compatibility layers and the D-Bus spec, but that shouldn't affect the +kernel side much anymore. + +As for maintainership, Daniel Mack, David Herrmann, Djalal Harouni and +myself would be taking care for it in the future. + +I'll also be keeping this in a git tree, the kdbus branch of +char-misc.git at: + https://git.kernel.org/cgit/linux/kernel/git/gregkh/char-misc.git/ + +thanks, + +greg k-h + +Daniel Mack (12): + kdbus: add documentation + kdbus: add header file + kdbus: add driver skeleton, ioctl entry points and utility functions + kdbus: add connection pool implementation + kdbus: add connection, queue handling and message validation code + kdbus: add code to gather metadata + kdbus: add code for notifications and matches + kdbus: add code for buses, domains and endpoints + kdbus: add name registry implementation + kdbus: add policy database implementation + kdbus: add Makefile, Kconfig and MAINTAINERS entry + kdbus: add selftests + + Documentation/ioctl/ioctl-number.txt | 1 + + Documentation/kdbus.txt | 1815 ++++++++++++++++++++++ + MAINTAINERS | 12 + + drivers/misc/Kconfig | 1 + + drivers/misc/Makefile | 1 + + drivers/misc/kdbus/Kconfig | 11 + + drivers/misc/kdbus/Makefile | 19 + + drivers/misc/kdbus/bus.c | 450 ++++++ + drivers/misc/kdbus/bus.h | 107 ++ + drivers/misc/kdbus/connection.c | 1751 +++++++++++++++++++++ + drivers/misc/kdbus/connection.h | 177 +++ + drivers/misc/kdbus/domain.c | 477 ++++++ + drivers/misc/kdbus/domain.h | 105 ++ + drivers/misc/kdbus/endpoint.c | 567 +++++++ + drivers/misc/kdbus/endpoint.h | 94 ++ + drivers/misc/kdbus/handle.c | 1221 +++++++++++++++ + drivers/misc/kdbus/handle.h | 46 + + drivers/misc/kdbus/item.c | 256 +++ + drivers/misc/kdbus/item.h | 40 + + drivers/misc/kdbus/limits.h | 77 + + drivers/misc/kdbus/main.c | 70 + + drivers/misc/kdbus/match.c | 521 +++++++ + drivers/misc/kdbus/match.h | 30 + + drivers/misc/kdbus/message.c | 420 +++++ + drivers/misc/kdbus/message.h | 72 + + drivers/misc/kdbus/metadata.c | 626 ++++++++ + drivers/misc/kdbus/metadata.h | 51 + + drivers/misc/kdbus/names.c | 920 +++++++++++ + drivers/misc/kdbus/names.h | 81 + + drivers/misc/kdbus/notify.c | 235 +++ + drivers/misc/kdbus/notify.h | 28 + + drivers/misc/kdbus/policy.c | 617 ++++++++ + drivers/misc/kdbus/policy.h | 60 + + drivers/misc/kdbus/pool.c | 728 +++++++++ + drivers/misc/kdbus/pool.h | 43 + + drivers/misc/kdbus/queue.c | 602 +++++++ + drivers/misc/kdbus/queue.h | 82 + + drivers/misc/kdbus/util.c | 108 ++ + drivers/misc/kdbus/util.h | 94 ++ + include/uapi/linux/kdbus.h | 918 +++++++++++ + tools/testing/selftests/Makefile | 1 + + tools/testing/selftests/kdbus/.gitignore | 11 + + tools/testing/selftests/kdbus/Makefile | 46 + + tools/testing/selftests/kdbus/kdbus-enum.c | 90 ++ + tools/testing/selftests/kdbus/kdbus-enum.h | 14 + + tools/testing/selftests/kdbus/kdbus-test.c | 474 ++++++ + tools/testing/selftests/kdbus/kdbus-test.h | 79 + + tools/testing/selftests/kdbus/kdbus-util.c | 1173 ++++++++++++++ + tools/testing/selftests/kdbus/kdbus-util.h | 139 ++ + tools/testing/selftests/kdbus/test-activator.c | 317 ++++ + tools/testing/selftests/kdbus/test-benchmark.c | 417 +++++ + tools/testing/selftests/kdbus/test-bus.c | 117 ++ + tools/testing/selftests/kdbus/test-chat.c | 123 ++ + tools/testing/selftests/kdbus/test-connection.c | 258 +++ + tools/testing/selftests/kdbus/test-daemon.c | 66 + + tools/testing/selftests/kdbus/test-domain.c | 65 + + tools/testing/selftests/kdbus/test-endpoint.c | 221 +++ + tools/testing/selftests/kdbus/test-fd.c | 473 ++++++ + tools/testing/selftests/kdbus/test-free.c | 34 + + tools/testing/selftests/kdbus/test-match.c | 385 +++++ + tools/testing/selftests/kdbus/test-message.c | 126 ++ + tools/testing/selftests/kdbus/test-metadata-ns.c | 236 +++ + tools/testing/selftests/kdbus/test-monitor.c | 156 ++ + tools/testing/selftests/kdbus/test-names.c | 184 +++ + tools/testing/selftests/kdbus/test-policy-ns.c | 578 +++++++ + tools/testing/selftests/kdbus/test-policy-priv.c | 1168 ++++++++++++++ + tools/testing/selftests/kdbus/test-policy.c | 81 + + tools/testing/selftests/kdbus/test-race.c | 313 ++++ + tools/testing/selftests/kdbus/test-sync.c | 241 +++ + tools/testing/selftests/kdbus/test-timeout.c | 97 ++ + 70 files changed, 21217 insertions(+) + create mode 100644 Documentation/kdbus.txt + create mode 100644 drivers/misc/kdbus/Kconfig + create mode 100644 drivers/misc/kdbus/Makefile + create mode 100644 drivers/misc/kdbus/bus.c + create mode 100644 drivers/misc/kdbus/bus.h + create mode 100644 drivers/misc/kdbus/connection.c + create mode 100644 drivers/misc/kdbus/connection.h + create mode 100644 drivers/misc/kdbus/domain.c + create mode 100644 drivers/misc/kdbus/domain.h + create mode 100644 drivers/misc/kdbus/endpoint.c + create mode 100644 drivers/misc/kdbus/endpoint.h + create mode 100644 drivers/misc/kdbus/handle.c + create mode 100644 drivers/misc/kdbus/handle.h + create mode 100644 drivers/misc/kdbus/item.c + create mode 100644 drivers/misc/kdbus/item.h + create mode 100644 drivers/misc/kdbus/limits.h + create mode 100644 drivers/misc/kdbus/main.c + create mode 100644 drivers/misc/kdbus/match.c + create mode 100644 drivers/misc/kdbus/match.h + create mode 100644 drivers/misc/kdbus/message.c + create mode 100644 drivers/misc/kdbus/message.h + create mode 100644 drivers/misc/kdbus/metadata.c + create mode 100644 drivers/misc/kdbus/metadata.h + create mode 100644 drivers/misc/kdbus/names.c + create mode 100644 drivers/misc/kdbus/names.h + create mode 100644 drivers/misc/kdbus/notify.c + create mode 100644 drivers/misc/kdbus/notify.h + create mode 100644 drivers/misc/kdbus/policy.c + create mode 100644 drivers/misc/kdbus/policy.h + create mode 100644 drivers/misc/kdbus/pool.c + create mode 100644 drivers/misc/kdbus/pool.h + create mode 100644 drivers/misc/kdbus/queue.c + create mode 100644 drivers/misc/kdbus/queue.h + create mode 100644 drivers/misc/kdbus/util.c + create mode 100644 drivers/misc/kdbus/util.h + create mode 100644 include/uapi/linux/kdbus.h + create mode 100644 tools/testing/selftests/kdbus/.gitignore + create mode 100644 tools/testing/selftests/kdbus/Makefile + create mode 100644 tools/testing/selftests/kdbus/kdbus-enum.c + create mode 100644 tools/testing/selftests/kdbus/kdbus-enum.h + create mode 100644 tools/testing/selftests/kdbus/kdbus-test.c + create mode 100644 tools/testing/selftests/kdbus/kdbus-test.h + create mode 100644 tools/testing/selftests/kdbus/kdbus-util.c + create mode 100644 tools/testing/selftests/kdbus/kdbus-util.h + create mode 100644 tools/testing/selftests/kdbus/test-activator.c + create mode 100644 tools/testing/selftests/kdbus/test-benchmark.c + create mode 100644 tools/testing/selftests/kdbus/test-bus.c + create mode 100644 tools/testing/selftests/kdbus/test-chat.c + create mode 100644 tools/testing/selftests/kdbus/test-connection.c + create mode 100644 tools/testing/selftests/kdbus/test-daemon.c + create mode 100644 tools/testing/selftests/kdbus/test-domain.c + create mode 100644 tools/testing/selftests/kdbus/test-endpoint.c + create mode 100644 tools/testing/selftests/kdbus/test-fd.c + create mode 100644 tools/testing/selftests/kdbus/test-free.c + create mode 100644 tools/testing/selftests/kdbus/test-match.c + create mode 100644 tools/testing/selftests/kdbus/test-message.c + create mode 100644 tools/testing/selftests/kdbus/test-metadata-ns.c + create mode 100644 tools/testing/selftests/kdbus/test-monitor.c + create mode 100644 tools/testing/selftests/kdbus/test-names.c + create mode 100644 tools/testing/selftests/kdbus/test-policy-ns.c + create mode 100644 tools/testing/selftests/kdbus/test-policy-priv.c + create mode 100644 tools/testing/selftests/kdbus/test-policy.c + create mode 100644 tools/testing/selftests/kdbus/test-race.c + create mode 100644 tools/testing/selftests/kdbus/test-sync.c + create mode 100644 tools/testing/selftests/kdbus/test-timeout.c + +-- +2.1.0 + |