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authorLinus Torvalds <torvalds@linux-foundation.org>2016-09-01 15:55:56 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-09-01 15:55:56 -0700
commit511a8cdb650544b7efd1bbccf7967d3153aee5f6 (patch)
tree9e97e173ca7fb552e4994dd527dcff396acfdcfb /kernel/fork.c
parent7d1ce606a37922879cbe40a6122047827105a332 (diff)
parent5efc244346f9f338765da3d592f7947b0afdc4b5 (diff)
downloadlinux-linaro-stable-511a8cdb650544b7efd1bbccf7967d3153aee5f6.tar.gz
Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit
Pull audit fixes from Paul Moore: "Two small patches to fix some bugs with the audit-by-executable functionality we introduced back in v4.3 (both patches are marked for the stable folks)" * 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit: audit: fix exe_file access in audit_exe_compare mm: introduce get_task_exe_file
Diffstat (limited to 'kernel/fork.c')
-rw-r--r--kernel/fork.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index aaf782327bf3..36c0daa03c60 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -799,6 +799,29 @@ struct file *get_mm_exe_file(struct mm_struct *mm)
EXPORT_SYMBOL(get_mm_exe_file);
/**
+ * get_task_exe_file - acquire a reference to the task's executable file
+ *
+ * Returns %NULL if task's mm (if any) has no associated executable file or
+ * this is a kernel thread with borrowed mm (see the comment above get_task_mm).
+ * User must release file via fput().
+ */
+struct file *get_task_exe_file(struct task_struct *task)
+{
+ struct file *exe_file = NULL;
+ struct mm_struct *mm;
+
+ task_lock(task);
+ mm = task->mm;
+ if (mm) {
+ if (!(task->flags & PF_KTHREAD))
+ exe_file = get_mm_exe_file(mm);
+ }
+ task_unlock(task);
+ return exe_file;
+}
+EXPORT_SYMBOL(get_task_exe_file);
+
+/**
* get_task_mm - acquire a reference to the task's mm
*
* Returns %NULL if the task has no mm. Checks PF_KTHREAD (meaning