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d6c7cf84a2
Upgrade domain's handled access masks when creating a domain from a ruleset, instead of converting them at runtime. This is more consistent and helps with audit support. Cc: Günther Noack <gnoack@google.com> Link: https://lore.kernel.org/r/20250108154338.1129069-7-mic@digikod.net Signed-off-by: Mickaël Salaün <mic@digikod.net>
78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Landlock LSM - Access types and helpers
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*
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* Copyright © 2016-2020 Mickaël Salaün <mic@digikod.net>
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* Copyright © 2018-2020 ANSSI
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* Copyright © 2024-2025 Microsoft Corporation
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*/
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#ifndef _SECURITY_LANDLOCK_ACCESS_H
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#define _SECURITY_LANDLOCK_ACCESS_H
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#include <linux/bitops.h>
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#include <linux/build_bug.h>
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#include <linux/kernel.h>
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#include <uapi/linux/landlock.h>
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#include "limits.h"
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/*
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* All access rights that are denied by default whether they are handled or not
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* by a ruleset/layer. This must be ORed with all ruleset->access_masks[]
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* entries when we need to get the absolute handled access masks, see
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* landlock_upgrade_handled_access_masks().
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*/
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/* clang-format off */
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#define _LANDLOCK_ACCESS_FS_INITIALLY_DENIED ( \
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LANDLOCK_ACCESS_FS_REFER)
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/* clang-format on */
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typedef u16 access_mask_t;
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/* Makes sure all filesystem access rights can be stored. */
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static_assert(BITS_PER_TYPE(access_mask_t) >= LANDLOCK_NUM_ACCESS_FS);
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/* Makes sure all network access rights can be stored. */
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static_assert(BITS_PER_TYPE(access_mask_t) >= LANDLOCK_NUM_ACCESS_NET);
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/* Makes sure all scoped rights can be stored. */
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static_assert(BITS_PER_TYPE(access_mask_t) >= LANDLOCK_NUM_SCOPE);
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/* Makes sure for_each_set_bit() and for_each_clear_bit() calls are OK. */
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static_assert(sizeof(unsigned long) >= sizeof(access_mask_t));
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/* Ruleset access masks. */
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struct access_masks {
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access_mask_t fs : LANDLOCK_NUM_ACCESS_FS;
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access_mask_t net : LANDLOCK_NUM_ACCESS_NET;
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access_mask_t scope : LANDLOCK_NUM_SCOPE;
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};
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union access_masks_all {
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struct access_masks masks;
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u32 all;
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};
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/* Makes sure all fields are covered. */
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static_assert(sizeof(typeof_member(union access_masks_all, masks)) ==
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sizeof(typeof_member(union access_masks_all, all)));
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typedef u16 layer_mask_t;
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/* Makes sure all layers can be checked. */
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static_assert(BITS_PER_TYPE(layer_mask_t) >= LANDLOCK_MAX_NUM_LAYERS);
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/* Upgrades with all initially denied by default access rights. */
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static inline struct access_masks
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landlock_upgrade_handled_access_masks(struct access_masks access_masks)
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{
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/*
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* All access rights that are denied by default whether they are
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* explicitly handled or not.
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*/
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if (access_masks.fs)
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access_masks.fs |= _LANDLOCK_ACCESS_FS_INITIALLY_DENIED;
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return access_masks;
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}
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#endif /* _SECURITY_LANDLOCK_ACCESS_H */
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