linux/security/landlock
Mickaël Salaün b91c3e4ea7
landlock: Add support for file reparenting with LANDLOCK_ACCESS_FS_REFER
Add a new LANDLOCK_ACCESS_FS_REFER access right to enable policy writers
to allow sandboxed processes to link and rename files from and to a
specific set of file hierarchies.  This access right should be composed
with LANDLOCK_ACCESS_FS_MAKE_* for the destination of a link or rename,
and with LANDLOCK_ACCESS_FS_REMOVE_* for a source of a rename.  This
lift a Landlock limitation that always denied changing the parent of an
inode.

Renaming or linking to the same directory is still always allowed,
whatever LANDLOCK_ACCESS_FS_REFER is used or not, because it is not
considered a threat to user data.

However, creating multiple links or renaming to a different parent
directory may lead to privilege escalations if not handled properly.
Indeed, we must be sure that the source doesn't gain more privileges by
being accessible from the destination.  This is handled by making sure
that the source hierarchy (including the referenced file or directory
itself) restricts at least as much the destination hierarchy.  If it is
not the case, an EXDEV error is returned, making it potentially possible
for user space to copy the file hierarchy instead of moving or linking
it.

Instead of creating different access rights for the source and the
destination, we choose to make it simple and consistent for users.
Indeed, considering the previous constraint, it would be weird to
require such destination access right to be also granted to the source
(to make it a superset).  Moreover, RENAME_EXCHANGE would also add to
the confusion because of paths being both a source and a destination.

See the provided documentation for additional details.

New tests are provided with a following commit.

Reviewed-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Link: https://lore.kernel.org/r/20220506161102.525323-8-mic@digikod.net
2022-05-23 13:27:59 +02:00
..
common.h landlock: Set up the security framework and manage credentials 2021-04-22 12:22:10 -07:00
cred.c landlock: Format with clang-format 2022-05-09 12:31:10 +02:00
cred.h landlock: Format with clang-format 2022-05-09 12:31:10 +02:00
fs.c landlock: Add support for file reparenting with LANDLOCK_ACCESS_FS_REFER 2022-05-23 13:27:59 +02:00
fs.h landlock: Define access_mask_t to enforce a consistent access mask size 2022-05-23 13:27:55 +02:00
Kconfig landlock: Support filesystem access-control 2021-04-22 12:22:11 -07:00
limits.h landlock: Add support for file reparenting with LANDLOCK_ACCESS_FS_REFER 2022-05-23 13:27:59 +02:00
Makefile landlock: Add syscall implementations 2021-04-22 12:22:11 -07:00
object.c landlock: Format with clang-format 2022-05-09 12:31:10 +02:00
object.h landlock: Format with clang-format 2022-05-09 12:31:10 +02:00
ptrace.c landlock: Format with clang-format 2022-05-09 12:31:10 +02:00
ptrace.h landlock: Add ptrace restrictions 2021-04-22 12:22:10 -07:00
ruleset.c landlock: Define access_mask_t to enforce a consistent access mask size 2022-05-23 13:27:55 +02:00
ruleset.h landlock: Fix same-layer rule unions 2022-05-23 13:27:57 +02:00
setup.c landlock: Support filesystem access-control 2021-04-22 12:22:11 -07:00
setup.h landlock: Support filesystem access-control 2021-04-22 12:22:11 -07:00
syscalls.c landlock: Add support for file reparenting with LANDLOCK_ACCESS_FS_REFER 2022-05-23 13:27:59 +02:00