diff options
| -rw-r--r-- | include/linux/tracehook.h | 15 | ||||
| -rw-r--r-- | mm/nommu.c | 4 |
2 files changed, 17 insertions, 2 deletions
diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h index 6468ca0fe69..e113e09b034 100644 --- a/include/linux/tracehook.h +++ b/include/linux/tracehook.h @@ -52,6 +52,21 @@ struct linux_binprm; /** + * tracehook_expect_breakpoints - guess if task memory might be touched + * @task: current task, making a new mapping + * + * Return nonzero if @task is expected to want breakpoint insertion in + * its memory at some point. A zero return is no guarantee it won't + * be done, but this is a hint that it's known to be likely. + * + * May be called with @task->mm->mmap_sem held for writing. + */ +static inline int tracehook_expect_breakpoints(struct task_struct *task) +{ + return (task_ptrace(task) & PT_PTRACED) != 0; +} + +/** * tracehook_unsafe_exec - check for exec declared unsafe due to tracing * @task: current task doing exec * diff --git a/mm/nommu.c b/mm/nommu.c index 4462b6a3fcb..5edccd9c921 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -22,7 +22,7 @@ #include <linux/pagemap.h> #include <linux/slab.h> #include <linux/vmalloc.h> -#include <linux/ptrace.h> +#include <linux/tracehook.h> #include <linux/blkdev.h> #include <linux/backing-dev.h> #include <linux/mount.h> @@ -745,7 +745,7 @@ static unsigned long determine_vm_flags(struct file *file, * it's being traced - otherwise breakpoints set in it may interfere * with another untraced process */ - if ((flags & MAP_PRIVATE) && (current->ptrace & PT_PTRACED)) + if ((flags & MAP_PRIVATE) && tracehook_expect_breakpoints(current)) vm_flags &= ~VM_MAYSHARE; return vm_flags; |