// SPDX-License-Identifier: GPL-2.0
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/*
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* Implementations of the security context functions.
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*
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* Author: Ondrej Mosnacek <omosnacek@gmail.com>
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* Copyright (C) 2020 Red Hat, Inc.
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*/
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#include <linux/jhash.h>
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#include "context.h"
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#include "mls.h"
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u32 context_compute_hash(const struct context *c)
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{
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u32 hash = 0;
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/*
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* If a context is invalid, it will always be represented by a
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* context struct with only the len & str set (and vice versa)
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* under a given policy. Since context structs from different
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* policies should never meet, it is safe to hash valid and
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* invalid contexts differently. The context_cmp() function
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* already operates under the same assumption.
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*/
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if (c->len)
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return full_name_hash(NULL, c->str, c->len);
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hash = jhash_3words(c->user, c->role, c->type, hash);
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hash = mls_range_hash(&c->range, hash);
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return hash;
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}
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