Revert the DEVRANDOM_WAIT feature

The DEVRANDOM_WAIT feature added a select() call to wait for the
`/dev/random` device to become readable before reading from the
`/dev/urandom` device. It was introduced in commit 38023b87f037
in order to mitigate the fact that the `/dev/urandom` device
does not block until the initial seeding of the kernel CSPRNG
has completed, contrary to the behaviour of the `getrandom()`
system call.

It turned out that this change had negative side effects on
performance which were not acceptable. After some discussion it
was decided to revert this feature and leave it up to the OS
resp. the platform maintainer to ensure a proper initialization
during early boot time.

Fixes #9078

This partially reverts commit 38023b87f037.

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Viktor Dukhovni <viktor@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9084)

2 files changed, 0 insertions, 26 deletions

diff --git a/crypto/rand/rand_unix.c b/crypto/rand/rand_unix.c
index 2b3e32dc96..3a6e00959c 100644
--- a/crypto/rand/rand_unix.c
+++ b/crypto/rand/rand_unix.c
@@ -489,29 +489,6 @@ size_t rand_pool_acquire_entropy(RAND_POOL *pool)
     bytes_needed = rand_pool_bytes_needed(pool, 1 /*entropy_factor*/);
     {
         size_t i;
-#ifdef DEVRANDOM_WAIT
-        static int wait_done = 0;
-
-        /*
-         * On some implementations reading from /dev/urandom is possible
-         * before it is initialized. Therefore we wait for /dev/random
-         * to be readable to make sure /dev/urandom is initialized.
-         */
-        if (!wait_done && bytes_needed > 0) {
-             int f = open(DEVRANDOM_WAIT, O_RDONLY);
-
-             if (f >= 0) {
-                 fd_set fds;
-
-                 FD_ZERO(&fds);
-                 FD_SET(f, &fds);
-                 while (select(f+1, &fds, NULL, NULL, NULL) < 0
-                        && errno == EINTR);
-                 close(f);
-             }
-             wait_done = 1;
-        }
-#endif
 
         for (i = 0; bytes_needed > 0 && i < OSSL_NELEM(random_device_paths); i++) {
             ssize_t bytes = 0;
diff --git a/e_os.h b/e_os.h
index 1c55272438..95ec0d6976 100644
--- a/e_os.h
+++ b/e_os.h
@@ -28,9 +28,6 @@
  * default, we will try to read at least one of these files
  */
 #  define DEVRANDOM "/dev/urandom", "/dev/random", "/dev/hwrng", "/dev/srandom"
-#  ifdef __linux
-#   define DEVRANDOM_WAIT "/dev/random"
-#  endif
 # endif
 # if !defined(OPENSSL_NO_EGD) && !defined(DEVRANDOM_EGD)
 /*