linux-toradex.git/tools/testing/selftests/namespaces/uid_map_range_test.c, branch master Linux kernel for Apalis and Colibri modules selftests/namespaces: add uid_map/gid_map range tests 2026-10-12T09:01:20+00:00 Natasha Klaus natalie.klaus@runtimeverification.com 2026-09-30T11:28:54+00:00 8b7b7739ea6a8797391189c6d07897584b611f7f Check that a uid_map or gid_map line with a value that does not fit in u32, or with a negative value, is rejected with EINVAL and installs nothing, for each of the three fields. Check that in-range lines are still accepted and read back unchanged: a plain single-id mapping, first id 0, the largest valid first id 4294967294, and a line with extra spaces between the fields. When run as root in the initial user namespace, also check that the largest count, "0 0 4294967295", is accepted when written by the parent into the uid_map of a child namespace; an unprivileged writer can only map a single id. Signed-off-by: Natasha Klaus <natalie.klaus@runtimeverification.com> Link: https://patch.msgid.link/20260930112854.373184-3-natalie.klaus@runtimeverification.com Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org> 
Check that a uid_map or gid_map line with a value that does not fit in
u32, or with a negative value, is rejected with EINVAL and installs
nothing, for each of the three fields.

Check that in-range lines are still accepted and read back unchanged:
a plain single-id mapping, first id 0, the largest valid first id
4294967294, and a line with extra spaces between the fields. When run
as root in the initial user namespace, also check that the largest
count, "0 0 4294967295", is accepted when written by the parent into
the uid_map of a child namespace; an unprivileged writer can only map
a single id.

Signed-off-by: Natasha Klaus <natalie.klaus@runtimeverification.com>
Link: https://patch.msgid.link/20260930112854.373184-3-natalie.klaus@runtimeverification.com
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>