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landlock: Fix documentation style

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It seems that all code should use double backquotes, which is also used
to convert "%" defines.  Let's use an homogeneous style and remove all
use of simple backquotes (which should only be used for emphasis).

Cc: Günther Noack <gnoack3000@gmail.com>
Cc: Paul Moore <paul@paul-moore.com>
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Link: https://lore.kernel.org/r/20220923154207.3311629-4-mic@digikod.net
This commit is contained in:
Mickaël Salaün
2022-09-23 17:42:07 +02:00
parent 16023b05f0
commit 2fff00c81d
4 changed files with 40 additions and 39 deletions
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25
Documentation/userspace-api/landlock.rst
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@@ -69,7 +69,7 @@ should try to protect users as much as possible whatever the kernel they are
using. To avoid binary enforcement (i.e. either all security features or
none), we can leverage a dedicated Landlock command to get the current version
of the Landlock ABI and adapt the handled accesses. Let's check if we should
remove the `LANDLOCK_ACCESS_FS_REFER` access right which is only supported
remove the ``LANDLOCK_ACCESS_FS_REFER`` access right which is only supported
starting with the second version of the ABI.
.. code-block:: c
@@ -128,7 +128,7 @@ descriptor.
It may also be required to create rules following the same logic as explained
for the ruleset creation, by filtering access rights according to the Landlock
ABI version. In this example, this is not required because
`LANDLOCK_ACCESS_FS_REFER` is not allowed by any rule.
``LANDLOCK_ACCESS_FS_REFER`` is not allowed by any rule.
We now have a ruleset with one rule allowing read access to ``/usr`` while
denying all other handled accesses for the filesystem. The next step is to
@@ -154,8 +154,8 @@ The current thread is now ready to sandbox itself with the ruleset.
}
close(ruleset_fd);
If the `landlock_restrict_self` system call succeeds, the current thread is now
restricted and this policy will be enforced on all its subsequently created
If the ``landlock_restrict_self`` system call succeeds, the current thread is
now restricted and this policy will be enforced on all its subsequently created
children as well. Once a thread is landlocked, there is no way to remove its
security policy; only adding more restrictions is allowed. These threads are
now in a new Landlock domain, merge of their parent one (if any) with the new
@@ -175,7 +175,8 @@ depend on their location (i.e. parent directories). This is particularly
relevant when we want to allow linking or renaming. Indeed, having consistent
access rights per directory enables to change the location of such directory
without relying on the destination directory access rights (except those that
are required for this operation, see `LANDLOCK_ACCESS_FS_REFER` documentation).
are required for this operation, see ``LANDLOCK_ACCESS_FS_REFER``
documentation).
Having self-sufficient hierarchies also helps to tighten the required access
rights to the minimal set of data. This also helps avoid sinkhole directories,
i.e. directories where data can be linked to but not linked from. However,
@@ -259,7 +260,7 @@ Backward and forward compatibility
Landlock is designed to be compatible with past and future versions of the
kernel. This is achieved thanks to the system call attributes and the
associated bitflags, particularly the ruleset's `handled_access_fs`. Making
associated bitflags, particularly the ruleset's ``handled_access_fs``. Making
handled access right explicit enables the kernel and user space to have a clear
contract with each other. This is required to make sure sandboxing will not
get stricter with a system update, which could break applications.
@@ -394,7 +395,7 @@ according to the potentially lost constraints. To protect against privilege
escalations through renaming or linking, and for the sake of simplicity,
Landlock previously limited linking and renaming to the same directory.
Starting with the Landlock ABI version 2, it is now possible to securely
control renaming and linking thanks to the new `LANDLOCK_ACCESS_FS_REFER`
control renaming and linking thanks to the new ``LANDLOCK_ACCESS_FS_REFER``
access right.
.. _kernel_support:
@@ -403,14 +404,14 @@ Kernel support
==============
Landlock was first introduced in Linux 5.13 but it must be configured at build
time with `CONFIG_SECURITY_LANDLOCK=y`. Landlock must also be enabled at boot
time with ``CONFIG_SECURITY_LANDLOCK=y``. Landlock must also be enabled at boot
time as the other security modules. The list of security modules enabled by
default is set with `CONFIG_LSM`. The kernel configuration should then
contains `CONFIG_LSM=landlock,[...]` with `[...]` as the list of other
default is set with ``CONFIG_LSM``. The kernel configuration should then
contains ``CONFIG_LSM=landlock,[...]`` with ``[...]`` as the list of other
potentially useful security modules for the running system (see the
`CONFIG_LSM` help).
``CONFIG_LSM`` help).
If the running kernel does not have `landlock` in `CONFIG_LSM`, then we can
If the running kernel does not have ``landlock`` in ``CONFIG_LSM``, then we can
still enable it by adding ``lsm=landlock,[...]`` to
Documentation/admin-guide/kernel-parameters.rst thanks to the bootloader
configuration.