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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* AppArmor security module
*
* This file contains AppArmor task related definitions and mediation
*
* Copyright 2017 Canonical Ltd.
*/
#ifndef __AA_TASK_H
#define __AA_TASK_H
static inline struct aa_task_ctx *task_ctx(struct task_struct *task)
{
return task->security + apparmor_blob_sizes.lbs_task;
}
/*
* struct aa_task_ctx - information for current task label change
* @nnp: snapshot of label at time of no_new_privs
* @onexec: profile to transition to on next exec (MAY BE NULL)
* @previous: profile the task may return to (MAY BE NULL)
* @token: magic value the task must know for returning to @previous_profile
*/
struct aa_task_ctx {
struct aa_label *nnp;
struct aa_label *onexec;
struct aa_label *previous;
u64 token;
};
int aa_replace_current_label(struct aa_label *label);
int aa_set_current_onexec(struct aa_label *label, bool stack);
int aa_set_current_hat(struct aa_label *label, u64 token);
int aa_restore_previous_label(u64 cookie);
struct aa_label *aa_get_task_label(struct task_struct *task);
/**
* aa_free_task_ctx - free a task_ctx
* @ctx: task_ctx to free (MAYBE NULL)
*/
static inline void aa_free_task_ctx(struct aa_task_ctx *ctx)
{
if (ctx) {
aa_put_label(ctx->nnp);
aa_put_label(ctx->previous);
aa_put_label(ctx->onexec);
}
}
/**
* aa_dup_task_ctx - duplicate a task context, incrementing reference counts
* @new: a blank task context (NOT NULL)
* @old: the task context to copy (NOT NULL)
*/
static inline void aa_dup_task_ctx(struct aa_task_ctx *new,
const struct aa_task_ctx *old)
{
*new = *old;
aa_get_label(new->nnp);
aa_get_label(new->previous);
aa_get_label(new->onexec);
}
/**
* aa_clear_task_ctx_trans - clear transition tracking info from the ctx
* @ctx: task context to clear (NOT NULL)
*/
static inline void aa_clear_task_ctx_trans(struct aa_task_ctx *ctx)
{
AA_BUG(!ctx);
aa_put_label(ctx->previous);
aa_put_label(ctx->onexec);
ctx->previous = NULL;
ctx->onexec = NULL;
ctx->token = 0;
}
#define AA_PTRACE_TRACE MAY_WRITE
#define AA_PTRACE_READ MAY_READ
#define AA_MAY_BE_TRACED AA_MAY_APPEND
#define AA_MAY_BE_READ AA_MAY_CREATE
#define PTRACE_PERM_SHIFT 2
#define AA_PTRACE_PERM_MASK (AA_PTRACE_READ | AA_PTRACE_TRACE | \
AA_MAY_BE_READ | AA_MAY_BE_TRACED)
#define AA_SIGNAL_PERM_MASK (MAY_READ | MAY_WRITE)
#define AA_SFS_SIG_MASK "hup int quit ill trap abrt bus fpe kill usr1 " \
"segv usr2 pipe alrm term stkflt chld cont stop stp ttin ttou urg " \
"xcpu xfsz vtalrm prof winch io pwr sys emt lost"
int aa_may_ptrace(const struct cred *tracer_cred, struct aa_label *tracer,
const struct cred *tracee_cred, struct aa_label *tracee,
u32 request);
#endif /* __AA_TASK_H */
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