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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Landlock - Capability hooks
*
* Copyright © 2026 Cloudflare, Inc.
*/
#ifndef _SECURITY_LANDLOCK_CAP_H
#define _SECURITY_LANDLOCK_CAP_H
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/capability.h>
#include <linux/types.h>
/**
* landlock_cap_to_bit - Convert a capability number to a compact bitmask
*
* @cap: Capability number (CAP_*).
*
* Return: BIT_ULL(@cap), or 0 if @cap is invalid (with a WARN).
*/
static inline u64 landlock_cap_to_bit(const int cap)
{
if (WARN_ON_ONCE(!cap_valid(cap)))
return 0;
return BIT_ULL(cap);
}
/**
* landlock_caps_to_bits - Validate and mask a capability bitmask
*
* @capabilities: Bitmask of capabilities (e.g. from user space).
*
* Return: @capabilities masked to known capabilities. Warns if unknown bits
* are present (callers must pre-mask for user input).
*/
static inline u64 landlock_caps_to_bits(const u64 capabilities)
{
/* Callers pre-mask (CAP_VALID_MASK); the WARN guards future callers. */
WARN_ON_ONCE(capabilities & ~CAP_VALID_MASK);
return capabilities & CAP_VALID_MASK;
}
__init void landlock_add_cap_hooks(void);
#endif /* _SECURITY_LANDLOCK_CAP_H */
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