services: urandom-seed: Set umask to 077 while shutting down.

* gnu/services/base.scm (urandom-seed-shepherd-service): Call 'umask'.

1 files changed, 6 insertions, 4 deletions

diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index a45f219643..b8e4741739 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -460,10 +460,12 @@ stopped before 'kill' is called."
                    (let ((buf (make-bytevector 512)))
                      (call-with-input-file "/dev/urandom"
                        (lambda (urandom)
-                         (get-bytevector-n! urandom buf 0 512)
-                         (call-with-output-file #$%random-seed-file
-                           (lambda (seed)
-                             (put-bytevector seed buf)))
+                         (let ((previous-umask (umask #o077)))
+                           (get-bytevector-n! urandom buf 0 512)
+                           (call-with-output-file #$%random-seed-file
+                             (lambda (seed)
+                               (put-bytevector seed buf)))
+                           (umask previous-umask))
                          #t)))))
          (modules `((rnrs bytevectors)
                     (rnrs io ports)