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authorKonstantin Ryabitsev <konstantin@linuxfoundation.org>2018-02-06 19:51:19 +0300
committerJonathan Corbet <corbet@lwn.net>2018-02-07 02:31:56 +0300
commit78ed78451963d1a4282bcda92059fdf2a7821401 (patch)
tree5a817e67fcb87bb7944e47912e9f208735a40644 /Documentation/process
parent54e36a2dc554685463af54b4ac97a5ec022bd09c (diff)
downloadlinux-78ed78451963d1a4282bcda92059fdf2a7821401.tar.xz
Documentation/process: tweak pgp maintainer guide
Based on the feedback provided: - Uniformly use lowercase k in "Linux kernel" - Give a one-sentence explanation of what subkeys are - Explain what signed commits might be useful for even if upstream developers do not use them for much of anything - Admonish to set up gpg-agent if signed commits are turned on in git config - Fix a typo reported by Luc Van Oostenryck Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/process')
-rw-r--r--Documentation/process/maintainer-pgp-guide.rst50
1 files changed, 34 insertions, 16 deletions
diff --git a/Documentation/process/maintainer-pgp-guide.rst b/Documentation/process/maintainer-pgp-guide.rst
index 28674eb42b95..b453561a7148 100644
--- a/Documentation/process/maintainer-pgp-guide.rst
+++ b/Documentation/process/maintainer-pgp-guide.rst
@@ -18,10 +18,10 @@ The role of PGP in Linux Kernel development
===========================================
PGP helps ensure the integrity of the code that is produced by the Linux
-Kernel development community and, to a lesser degree, establish trusted
+kernel development community and, to a lesser degree, establish trusted
communication channels between developers via PGP-signed email exchange.
-The Linux Kernel source code is available in two main formats:
+The Linux kernel source code is available in two main formats:
- Distributed source repositories (git)
- Periodic release snapshots (tarballs)
@@ -53,7 +53,7 @@ want to make sure that by placing trust into developers we do not simply
shift the blame for potential future security incidents to someone else.
The goal is to provide a set of guidelines developers can use to create
a secure working environment and safeguard the PGP keys used to
-establish the integrity of the Linux Kernel itself.
+establish the integrity of the Linux kernel itself.
.. _pgp_tools:
@@ -139,7 +139,7 @@ Protect your master PGP key
===========================
This guide assumes that you already have a PGP key that you use for Linux
-Kernel development purposes. If you do not yet have one, please see the
+kernel development purposes. If you do not yet have one, please see the
"`Protecting Code Integrity`_" document mentioned earlier for guidance
on how to create a new one.
@@ -149,7 +149,9 @@ You should also make a new key if your current one is weaker than 2048 bits
Master key vs. Subkeys
----------------------
-It is important to understand the following:
+Subkeys are fully independent PGP keypairs that are tied to the "master"
+key using certifying key signatures (certificates). It is important to
+understand the following:
1. There are no technical differences between the "master key" and "subkeys."
2. At creation time, we assign functional limitations to each key by
@@ -742,17 +744,29 @@ How to work with signed commits
-------------------------------
It is easy to create signed commits, but it is much more difficult to
-use them in Linux Kernel development, since it relies on patches sent to
+use them in Linux kernel development, since it relies on patches sent to
the mailing list, and this workflow does not preserve PGP commit
-signatures.
-
-If you have your working git tree publicly available at some git hosting
-service (kernel.org, infradead.org, ozlabs.org, or others), then the
-recommendation is that you sign all your git commits even if upstream
-developers do not directly benefit from this practice. Should there ever
-be a need to perform code forensics or track code provenance, even
-externally maintained trees carrying PGP commit signatures will be
-extremely valuable for such purposes.
+signatures. Furthermore, when rebasing your repository to match
+upstream, even your own PGP commit signatures will end up discarded. For
+this reason, most kernel developers don't bother signing their commits
+and will ignore signed commits in any external repositories that they
+rely upon in their work.
+
+However, if you have your working git tree publicly available at some
+git hosting service (kernel.org, infradead.org, ozlabs.org, or others),
+then the recommendation is that you sign all your git commits even if
+upstream developers do not directly benefit from this practice.
+
+We recommend this for the following reasons:
+
+1. Should there ever be a need to perform code forensics or track code
+ provenance, even externally maintained trees carrying PGP commit
+ signatures will be valuable for such purposes.
+2. If you ever need to re-clone your local repository (for example,
+ after a disk failure), this lets you easily verify the repository
+ integrity before resuming your work.
+3. If someone needs to cherry-pick your commits, this allows them to
+ quickly verify their integrity before applying them.
Creating signed commits
~~~~~~~~~~~~~~~~~~~~~~~
@@ -770,6 +784,10 @@ You can tell git to always sign commits::
git config --global commit.gpgSign true
+.. note::
+
+ Make sure you configure ``gpg-agent`` before you turn this on.
+
.. _verify_identities:
How to verify kernel developer identities
@@ -882,7 +900,7 @@ Locate the ID of the master key in the output, in our example
``C94035C21B4F2AEB``. Now display the key of Linus Torvalds that you
have on your keyring::
- $ git --list-key torvalds@kernel.org
+ $ gpg --list-key torvalds@kernel.org
pub rsa2048 2011-09-20 [SC]
ABAF11C65A2970B130ABE3C479BE3E4300411886
uid [ unknown] Linus Torvalds <torvalds@kernel.org>