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Diffstat (limited to 'kernel/sys.c')
-rw-r--r--kernel/sys.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/kernel/sys.c b/kernel/sys.c
index 88b31f096fb2..495cd87d9bf4 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -2350,6 +2350,33 @@ static int prctl_set_vma(unsigned long opt, unsigned long start,
}
#endif /* CONFIG_ANON_VMA_NAME */
+static inline int prctl_set_mdwe(unsigned long bits, unsigned long arg3,
+ unsigned long arg4, unsigned long arg5)
+{
+ if (arg3 || arg4 || arg5)
+ return -EINVAL;
+
+ if (bits & ~(PR_MDWE_REFUSE_EXEC_GAIN))
+ return -EINVAL;
+
+ if (bits & PR_MDWE_REFUSE_EXEC_GAIN)
+ set_bit(MMF_HAS_MDWE, &current->mm->flags);
+ else if (test_bit(MMF_HAS_MDWE, &current->mm->flags))
+ return -EPERM; /* Cannot unset the flag */
+
+ return 0;
+}
+
+static inline int prctl_get_mdwe(unsigned long arg2, unsigned long arg3,
+ unsigned long arg4, unsigned long arg5)
+{
+ if (arg2 || arg3 || arg4 || arg5)
+ return -EINVAL;
+
+ return test_bit(MMF_HAS_MDWE, &current->mm->flags) ?
+ PR_MDWE_REFUSE_EXEC_GAIN : 0;
+}
+
SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
unsigned long, arg4, unsigned long, arg5)
{
@@ -2625,6 +2652,12 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
error = sched_core_share_pid(arg2, arg3, arg4, arg5);
break;
#endif
+ case PR_SET_MDWE:
+ error = prctl_set_mdwe(arg2, arg3, arg4, arg5);
+ break;
+ case PR_GET_MDWE:
+ error = prctl_get_mdwe(arg2, arg3, arg4, arg5);
+ break;
case PR_SET_VMA:
error = prctl_set_vma(arg2, arg3, arg4, arg5);
break;