1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * AppArmor security module 4 * 5 * This file contains AppArmor task related definitions and mediation 6 * 7 * Copyright 2017 Canonical Ltd. 8 */ 9 10 #ifndef __AA_TASK_H 11 #define __AA_TASK_H 12 13 #include <linux/sched.h> 14 15 #include "audit.h" 16 #include "label.h" 17 18 static inline struct aa_task_ctx *task_ctx(struct task_struct *task) 19 { 20 return task->security + apparmor_blob_sizes.lbs_task; 21 } 22 23 /* 24 * struct aa_task_ctx - information for current task label change 25 * @nnp: snapshot of label at time of no_new_privs 26 * @onexec: profile to transition to on next exec (MAY BE NULL) 27 * @previous: profile the task may return to (MAY BE NULL) 28 * @token: magic value the task must know for returning to @previous_profile 29 */ 30 struct aa_task_ctx { 31 struct aa_label *nnp; 32 struct aa_label *onexec; 33 struct aa_label *previous; 34 u64 token; 35 }; 36 37 int aa_replace_current_label(struct aa_label *label); 38 void aa_set_current_onexec(struct aa_label *label, bool stack); 39 int aa_set_current_hat(struct aa_label *label, u64 token); 40 int aa_restore_previous_label(u64 cookie); 41 struct aa_label *aa_get_task_label(struct task_struct *task); 42 43 /** 44 * aa_free_task_ctx - free a task_ctx 45 * @ctx: task_ctx to free (MAYBE NULL) 46 */ 47 static inline void aa_free_task_ctx(struct aa_task_ctx *ctx) 48 { 49 if (ctx) { 50 aa_put_label(ctx->nnp); 51 aa_put_label(ctx->previous); 52 aa_put_label(ctx->onexec); 53 } 54 } 55 56 /** 57 * aa_dup_task_ctx - duplicate a task context, incrementing reference counts 58 * @new: a blank task context (NOT NULL) 59 * @old: the task context to copy (NOT NULL) 60 */ 61 static inline void aa_dup_task_ctx(struct aa_task_ctx *new, 62 const struct aa_task_ctx *old) 63 { 64 *new = *old; 65 aa_get_label(new->nnp); 66 aa_get_label(new->previous); 67 aa_get_label(new->onexec); 68 } 69 70 /** 71 * aa_clear_task_ctx_trans - clear transition tracking info from the ctx 72 * @ctx: task context to clear (NOT NULL) 73 */ 74 static inline void aa_clear_task_ctx_trans(struct aa_task_ctx *ctx) 75 { 76 AA_BUG(!ctx); 77 78 aa_put_label(ctx->previous); 79 aa_put_label(ctx->onexec); 80 ctx->previous = NULL; 81 ctx->onexec = NULL; 82 ctx->token = 0; 83 } 84 85 #define AA_PTRACE_TRACE MAY_WRITE 86 #define AA_PTRACE_READ MAY_READ 87 #define AA_MAY_BE_TRACED AA_MAY_APPEND 88 #define AA_MAY_BE_READ AA_MAY_CREATE 89 #define PTRACE_PERM_SHIFT 2 90 91 #define AA_PTRACE_PERM_MASK (AA_PTRACE_READ | AA_PTRACE_TRACE | \ 92 AA_MAY_BE_READ | AA_MAY_BE_TRACED) 93 #define AA_SIGNAL_PERM_MASK (MAY_READ | MAY_WRITE) 94 95 #define AA_SFS_SIG_MASK "hup int quit ill trap abrt bus fpe kill usr1 " \ 96 "segv usr2 pipe alrm term stkflt chld cont stop stp ttin ttou urg " \ 97 "xcpu xfsz vtalrm prof winch io pwr sys emt lost" 98 99 int aa_may_ptrace(const struct cred *tracer_cred, struct aa_label *tracer, 100 const struct cred *tracee_cred, struct aa_label *tracee, 101 u32 request); 102 103 104 105 #define AA_USERNS_CREATE 8 106 107 int aa_profile_ns_perm(struct aa_profile *profile, 108 struct apparmor_audit_data *ad, u32 request); 109 110 #endif /* __AA_TASK_H */ 111