#include <linux/cn_proc.h>
#include <linux/compat.h>
#include <linux/sched/signal.h>
+#include <linux/minmax.h>
#include <asm/syscall.h> /* for syscall_get_* */
spin_unlock(&child->sighand->siglock);
}
+static bool looks_like_a_spurious_pid(struct task_struct *task)
+{
+ if (task->exit_code != ((PTRACE_EVENT_EXEC << 8) | SIGTRAP))
+ return false;
+
+ if (task_pid_vnr(task) == task->ptrace_message)
+ return false;
+ /*
+ * The tracee changed its pid but the PTRACE_EVENT_EXEC event
+ * was not wait()'ed, most probably debugger targets the old
+ * leader which was destroyed in de_thread().
+ */
+ return true;
+}
+
/* Ensure that nothing can wake it up, even SIGKILL */
static bool ptrace_freeze_traced(struct task_struct *task)
{
return ret;
spin_lock_irq(&task->sighand->siglock);
- if (task_is_traced(task) && !__fatal_signal_pending(task)) {
+ if (task_is_traced(task) && !looks_like_a_spurious_pid(task) &&
+ !__fatal_signal_pending(task)) {
task->state = __TASK_TRACED;
ret = true;
}
return ret;
}
+#ifdef CONFIG_RSEQ
+static long ptrace_get_rseq_configuration(struct task_struct *task,
+ unsigned long size, void __user *data)
+{
+ struct ptrace_rseq_configuration conf = {
+ .rseq_abi_pointer = (u64)(uintptr_t)task->rseq,
+ .rseq_abi_size = sizeof(*task->rseq),
+ .signature = task->rseq_sig,
+ .flags = 0,
+ };
+
+ size = min_t(unsigned long, size, sizeof(conf));
+ if (copy_to_user(data, &conf, size))
+ return -EFAULT;
+ return sizeof(conf);
+}
+#endif
+
#ifdef PTRACE_SINGLESTEP
#define is_singlestep(request) ((request) == PTRACE_SINGLESTEP)
#else
ret = seccomp_get_metadata(child, addr, datavp);
break;
+#ifdef CONFIG_RSEQ
+ case PTRACE_GET_RSEQ_CONFIGURATION:
+ ret = ptrace_get_rseq_configuration(child, addr, datavp);
+ break;
+#endif
+
default:
break;
}