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A Landlock object enables to identify a kernel object (e.g. an inode). A Landlock rule is a set of access rights allowed on an object. Rules are grouped in rulesets that may be tied to a set of processes (i.e. subjects) to enforce a scoped access-control (i.e. a domain). Because Landlock's goal is to empower any process (especially unprivileged ones) to sandbox themselves, we cannot rely on a system-wide object identification such as file extended attributes. Indeed, we need innocuous, composable and modular access-controls. The main challenge with these constraints is to identify kernel objects while this identification is useful (i.e. when a security policy makes use of this object). But this identification data should be freed once no policy is using it. This ephemeral tagging should not and may not be written in the filesystem. We then need to manage the lifetime of a rule according to the lifetime of its objects. To avoid a global lock, this implementation make use of RCU and counters to safely reference objects. A following commit uses this generic object management for inodes. Cc: James Morris <jmorris@namei.org> Signed-off-by: Mickaël Salaün <mic@linux.microsoft.com> Reviewed-by: Jann Horn <jannh@google.com> Acked-by: Serge Hallyn <serge@hallyn.com> Reviewed-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20210422154123.13086-2-mic@digikod.net Signed-off-by: James Morris <jamorris@linux.microsoft.com>
40 lines
1.4 KiB
Makefile
40 lines
1.4 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for the kernel security code
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#
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obj-$(CONFIG_KEYS) += keys/
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subdir-$(CONFIG_SECURITY_SELINUX) += selinux
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subdir-$(CONFIG_SECURITY_SMACK) += smack
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subdir-$(CONFIG_SECURITY_TOMOYO) += tomoyo
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subdir-$(CONFIG_SECURITY_APPARMOR) += apparmor
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subdir-$(CONFIG_SECURITY_YAMA) += yama
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subdir-$(CONFIG_SECURITY_LOADPIN) += loadpin
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subdir-$(CONFIG_SECURITY_SAFESETID) += safesetid
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subdir-$(CONFIG_SECURITY_LOCKDOWN_LSM) += lockdown
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subdir-$(CONFIG_BPF_LSM) += bpf
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subdir-$(CONFIG_SECURITY_LANDLOCK) += landlock
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# always enable default capabilities
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obj-y += commoncap.o
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obj-$(CONFIG_MMU) += min_addr.o
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# Object file lists
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obj-$(CONFIG_SECURITY) += security.o
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obj-$(CONFIG_SECURITYFS) += inode.o
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obj-$(CONFIG_SECURITY_SELINUX) += selinux/
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obj-$(CONFIG_SECURITY_SMACK) += smack/
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obj-$(CONFIG_SECURITY) += lsm_audit.o
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obj-$(CONFIG_SECURITY_TOMOYO) += tomoyo/
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obj-$(CONFIG_SECURITY_APPARMOR) += apparmor/
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obj-$(CONFIG_SECURITY_YAMA) += yama/
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obj-$(CONFIG_SECURITY_LOADPIN) += loadpin/
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obj-$(CONFIG_SECURITY_SAFESETID) += safesetid/
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obj-$(CONFIG_SECURITY_LOCKDOWN_LSM) += lockdown/
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obj-$(CONFIG_CGROUPS) += device_cgroup.o
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obj-$(CONFIG_BPF_LSM) += bpf/
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obj-$(CONFIG_SECURITY_LANDLOCK) += landlock/
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# Object integrity file lists
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subdir-$(CONFIG_INTEGRITY) += integrity
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obj-$(CONFIG_INTEGRITY) += integrity/
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