Documentation: security/credentials.rst: explain need to sort group_list
This patch updates the documentation with the observations that led
to commit bdcf0a423ea1 ("kernel: make groups_sort calling a
responsibility group_info allocators") and the new behaviour required.
Specifically that groups_sort() should be called on a new group_list
before set_groups() or set_current_groups() is called.
Signed-off-by: NeilBrown <neilb@suse.com>
[jc: use proper :c:func: references]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/security/credentials.rst b/Documentation/security/credentials.rst
index 66a2e24..5bb7125 100644
--- a/Documentation/security/credentials.rst
+++ b/Documentation/security/credentials.rst
@@ -451,6 +451,13 @@
are available for this purpose as current_cred() will return the current set
still at this point.
+When replacing the group list, the new list must be sorted before it
+is added to the credential, as a binary search is used to test for
+membership. In practice, this means :c:func:`groups_sort` should be
+called before :c:func:`set_groups` or :c:func:`set_current_groups`.
+:c:func:`groups_sort)` must not be called on a ``struct group_list`` which
+is shared as it may permute elements as part of the sorting process
+even if the array is already sorted.
When the credential set is ready, it should be committed to the current process
by calling::
