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32 lines
862 B
32 lines
862 B
// 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 <[email protected]> |
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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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