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