diff options
| -rw-r--r-- | fs/proc/array.c | 2 | ||||
| -rw-r--r-- | fs/proc/base.c | 2 | ||||
| -rw-r--r-- | include/linux/ptrace.h | 18 | ||||
| -rw-r--r-- | include/linux/tracehook.h | 18 | ||||
| -rw-r--r-- | security/apparmor/domain.c | 2 | ||||
| -rw-r--r-- | security/selinux/hooks.c | 4 |
6 files changed, 23 insertions, 23 deletions
diff --git a/fs/proc/array.c b/fs/proc/array.c index 9b45ee8..3a1dafd 100644 --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -172,7 +172,7 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns, task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0; tpid = 0; if (pid_alive(p)) { - struct task_struct *tracer = tracehook_tracer_task(p); + struct task_struct *tracer = ptrace_parent(p); if (tracer) tpid = task_pid_nr_ns(tracer, ns); } diff --git a/fs/proc/base.c b/fs/proc/base.c index 14def99..c883dad 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -216,7 +216,7 @@ static struct mm_struct *__check_mem_permission(struct task_struct *task) if (task_is_stopped_or_traced(task)) { int match; rcu_read_lock(); - match = (tracehook_tracer_task(task) == current); + match = (ptrace_parent(task) == current); rcu_read_unlock(); if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH)) return mm; diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h index b546fd6..bb157bdd 100644 --- a/include/linux/ptrace.h +++ b/include/linux/ptrace.h @@ -151,6 +151,24 @@ int generic_ptrace_pokedata(struct task_struct *tsk, unsigned long addr, unsigned long data); /** + * ptrace_parent - return the task that is tracing the given task + * @task: task to consider + * + * Returns %NULL if no one is tracing @task, or the &struct task_struct + * pointer to its tracer. + * + * Must called under rcu_read_lock(). The pointer returned might be kept + * live only by RCU. During exec, this may be called with task_lock() held + * on @task, still held from when check_unsafe_exec() was called. + */ +static inline struct task_struct *ptrace_parent(struct task_struct *task) +{ + if (unlikely(task->ptrace)) + return rcu_dereference(task->parent); + return NULL; +} + +/** * ptrace_event_enabled - test whether a ptrace event is enabled * @task: ptracee of interest * @event: %PTRACE_EVENT_* to test diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h index bcc4ca7..7a1bd12 100644 --- a/include/linux/tracehook.h +++ b/include/linux/tracehook.h @@ -130,24 +130,6 @@ static inline void tracehook_report_syscall_exit(struct pt_regs *regs, int step) } /** - * tracehook_tracer_task - return the task that is tracing the given task - * @tsk: task to consider - * - * Returns NULL if no one is tracing @task, or the &struct task_struct - * pointer to its tracer. - * - * Must called under rcu_read_lock(). The pointer returned might be kept - * live only by RCU. During exec, this may be called with task_lock() - * held on @task, still held from when tracehook_unsafe_exec() was called. - */ -static inline struct task_struct *tracehook_tracer_task(struct task_struct *tsk) -{ - if (tsk->ptrace & PT_PTRACED) - return rcu_dereference(tsk->parent); - return NULL; -} - -/** * tracehook_signal_handler - signal handler setup is complete * @sig: number of signal being delivered * @info: siginfo_t of signal being delivered diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c index c825c6e..7312bf9 100644 --- a/security/apparmor/domain.c +++ b/security/apparmor/domain.c @@ -67,7 +67,7 @@ static int may_change_ptraced_domain(struct task_struct *task, int error = 0; rcu_read_lock(); - tracer = tracehook_tracer_task(task); + tracer = ptrace_parent(task); if (tracer) { /* released below */ cred = get_task_cred(tracer); diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index a0d3845..fc07d18 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -2048,7 +2048,7 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm) u32 ptsid = 0; rcu_read_lock(); - tracer = tracehook_tracer_task(current); + tracer = ptrace_parent(current); if (likely(tracer != NULL)) { sec = __task_cred(tracer)->security; ptsid = sec->sid; @@ -5314,7 +5314,7 @@ static int selinux_setprocattr(struct task_struct *p, Otherwise, leave SID unchanged and fail. */ ptsid = 0; task_lock(p); - tracer = tracehook_tracer_task(p); + tracer = ptrace_parent(p); if (tracer) ptsid = task_sid(tracer); task_unlock(p); |
