95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/*
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* AppArmor security module
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*
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* This file contains AppArmor task related definitions and mediation
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*
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* Copyright 2017 Canonical Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*/
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#ifndef __AA_TASK_H
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#define __AA_TASK_H
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#define task_ctx(X) ((X)->security)
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/*
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* struct aa_task_ctx - information for current task label change
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* @nnp: snapshot of label at time of no_new_privs
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* @onexec: profile to transition to on next exec (MAY BE NULL)
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* @previous: profile the task may return to (MAY BE NULL)
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* @token: magic value the task must know for returning to @previous_profile
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*/
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struct aa_task_ctx {
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struct aa_label *nnp;
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struct aa_label *onexec;
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struct aa_label *previous;
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u64 token;
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};
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int aa_replace_current_label(struct aa_label *label);
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int aa_set_current_onexec(struct aa_label *label, bool stack);
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int aa_set_current_hat(struct aa_label *label, u64 token);
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int aa_restore_previous_label(u64 cookie);
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struct aa_label *aa_get_task_label(struct task_struct *task);
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/**
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* aa_alloc_task_ctx - allocate a new task_ctx
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* @flags: gfp flags for allocation
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*
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* Returns: allocated buffer or NULL on failure
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*/
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static inline struct aa_task_ctx *aa_alloc_task_ctx(gfp_t flags)
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{
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return kzalloc(sizeof(struct aa_task_ctx), flags);
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}
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/**
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* aa_free_task_ctx - free a task_ctx
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* @ctx: task_ctx to free (MAYBE NULL)
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*/
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static inline void aa_free_task_ctx(struct aa_task_ctx *ctx)
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{
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if (ctx) {
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aa_put_label(ctx->nnp);
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aa_put_label(ctx->previous);
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aa_put_label(ctx->onexec);
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kzfree(ctx);
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}
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}
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/**
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* aa_dup_task_ctx - duplicate a task context, incrementing reference counts
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* @new: a blank task context (NOT NULL)
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* @old: the task context to copy (NOT NULL)
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*/
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static inline void aa_dup_task_ctx(struct aa_task_ctx *new,
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const struct aa_task_ctx *old)
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{
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*new = *old;
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aa_get_label(new->nnp);
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aa_get_label(new->previous);
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aa_get_label(new->onexec);
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}
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/**
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* aa_clear_task_ctx_trans - clear transition tracking info from the ctx
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* @ctx: task context to clear (NOT NULL)
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*/
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static inline void aa_clear_task_ctx_trans(struct aa_task_ctx *ctx)
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{
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AA_BUG(!ctx);
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aa_put_label(ctx->previous);
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aa_put_label(ctx->onexec);
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ctx->previous = NULL;
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ctx->onexec = NULL;
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ctx->token = 0;
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}
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#endif /* __AA_TASK_H */
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