Changes in user_ns_map_kunit.c

e86d265826b8dc54178e16c4027d3bd5d0299f12 - Merge tag 'namespace-7.4-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Tue, 20 Oct 2026 04:09:10 +0200

Merge tag 'namespace-7.4-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfsPull namespace updates from Christian Brauner: - Reject uid_map, gid_map and projid_map values that don't fit in a u32. map_write() parsed with simple_strtoul() and truncated modulo 2^32 on 64-bit so "4294967301 1000 1" was installed as "5 1000 1" without an error. Each field is parsed with kstrtou32() now and selftests cover the out-of-range, negative and in-range cases. This isn't a security fix. The truncated values were valid ids and every later check still applied to them. - Annotate struct uid_gid_map's forward and reverse pointers with __counted_by_ptr and add a KUnit suite for inserting and sorting extents. insert_extent() wrote to forward[nr_extents] before bumping the count which the annotation flags, so it bumps first now. Two follow-up fixes rename the now global helpers to uid_gid_map_insert_extent() and uid_gid_map_sort(), since the btrfs self-tests have their own insert_extent(), and guard the declarations on CONFIG_KUNIT. - Drop the BUG_ON() NULL checks in copy_mnt_ns() and copy_utsname(). create_new_namespaces() always passes a valid pointer and the other copy_*_ns() helpers don't check either. - Remove a dead key_put() on the create_user_ns() error path.* tag 'namespace-7.4-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: selftests/namespaces: add uid_map/gid_map range tests userns: reject uid_map/gid_map values that do not fit in u32 userns: declare the KUnit-visible helpers whenever KUnit is enabled userns: rename insert_extent() and sort_idmaps() userns: Add KUnit test suite for uid_gid_map userns: Add __counted_by_ptr attribute to struct uid_gid_map fs: namespace: drop BUG_ON() in copy_mnt_ns() uts: drop BUG_ON() in copy_utsname() userns: remove dead key_put() on the create_user_ns() error path List of files: /linux/kernel/tests/user_ns_map_kunit.c

15aa70de9f706fb0e3852f636b8a0a9d5bc048ab - Merge patch series "Minor bugfixes for kunit userns tests"

Fri, 11 Sep 2026 15:00:41 +0200

Merge patch series "Minor bugfixes for kunit userns tests"Christian Brauner says:Two fixes for the kunit userns tests. Rename the helpers and make surethat the correct config knob guards the declarations.Christian Brauner (2): userns: rename insert_extent() and sort_idmaps() userns: declare the KUnit-visible helpers whenever KUnit is enabledinclude/linux/user_namespace.h | 9 +++++---- kernel/tests/user_ns_map_kunit.c | 6 +++--- kernel/user_namespace.c | 19 ++++++++++--------- 3 files changed, 18 insertions(+), 16 deletions(-)Link: https://patch.msgid.link/20260911-deftig-geprahlt-gesehen-16310bdf51f5@brauner* patches from https://patch.msgid.link/20260911-deftig-geprahlt-gesehen-16310bdf51f5@brauner: userns: declare the KUnit-visible helpers whenever KUnit is enabled userns: rename insert_extent() and sort_idmaps()Signed-off-by: Christian Brauner (Amutable) List of files: /linux/kernel/tests/user_ns_map_kunit.c

86cfbad9d7b3d2f6546dd3452aaade8022ac63ec - userns: rename insert_extent() and sort_idmaps()

Fri, 11 Sep 2026 14:58:39 +0200

userns: rename insert_extent() and sort_idmaps()The KUnit test suite turned insert_extent() and sort_idmaps() into globalsymbols and declared them in include/linux/user_namespace.h. That headeris pulled in nearly everywhere through linux/cgroup.h and the btrfsself-tests carry a static insert_extent() of their own, so any configwith both test suites enabled fails to build: fs/btrfs/tests/inode-tests.c:16:13: error: conflicting types for 'insert_extent' include/linux/user_namespace.h:212:12: note: previous declaration of 'insert_extent'A global symbol needs a prefix. Rename them touid_gid_map_insert_extent() and uid_gid_map_sort(). It's the better nameanyway.No functional changes.Fixes: f6f1a2496ba5 ("userns: Add KUnit test suite for uid_gid_map")Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202609110843.okbPe7GM-lkp@intel.com/Closes: https://lore.kernel.org/oe-kbuild-all/202609110937.zHKPPXJk-lkp@intel.com/Link: https://patch.msgid.link/20260911-suggerieren-suchaktion-fliehen-87b9cdf1d169@braunerSigned-off-by: Christian Brauner (Amutable) List of files: /linux/kernel/tests/user_ns_map_kunit.c

34a496d638705dc227cc6dd2aaaa9e450893502f - Merge patch series "userns: Add __counted_by_ptr attribute to struct uid_gid_map"

Wed, 09 Sep 2026 09:45:17 +0200

Merge patch series "userns: Add __counted_by_ptr attribute to struct uid_gid_map"Add kunit tests for user namespace idmappings.* patches from https://patch.msgid.link/20260908222734.3048684-1-morbo@google.com: userns: Add KUnit test suite for uid_gid_map userns: Add __counted_by_ptr attribute to struct uid_gid_mapLink: https://patch.msgid.link/20260908222734.3048684-1-morbo@google.comSigned-off-by: Christian Brauner (Amutable) List of files: /linux/kernel/tests/user_ns_map_kunit.c

f6f1a2496ba5dcc076d7fb7aa329887cd6ae55fa - userns: Add KUnit test suite for uid_gid_map

Wed, 09 Sep 2026 00:27:30 +0200

userns: Add KUnit test suite for uid_gid_mapAdd a KUnit test suite to verify the insertion and sorting of mappingsin struct uid_gid_map. This test suite validates both base extentinsertion (<= 5 mappings) and extended extent insertion (> 5 mappings,which triggers the allocation of the forward and reverse pointers).This is especially useful for verifying that the __counted_by_ptrattribute added to 'forward' and 'reverse' pointers works correctlywithout causing any runtime bounds-checking panics or traps.Signed-off-by: Bill Wendling Link: https://patch.msgid.link/20260908222734.3048684-2-morbo@google.comTested-by: Bradley Morgan Reviewed-by: Bradley Morgan Signed-off-by: Christian Brauner (Amutable) List of files: /linux/kernel/tests/user_ns_map_kunit.c