diff --git a/mm/memfd.c b/mm/memfd.c
index 0f6fff004f5e..0e3ff3eebfa8 100644
--- a/mm/memfd.c
+++ b/mm/memfd.c
@@ -482,6 +482,8 @@ struct file *memfd_alloc_file(const char *name, unsigned int flags)
 	}
 
 	file->f_mode |= FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE;
+	/* a regular file like any other: POSIX.1-2008/SUSv4 Section XSI 2.9.7 */
+	file->f_mode |= FMODE_ATOMIC_POS;
 	file->f_flags |= O_LARGEFILE;
 
 	if (flags & MFD_NOEXEC_SEAL) {