random: switch to using getrandom() directly

This requires a linux kernel of 3.17.0+, which seems entirely
reasonable. 3.17 went EOL in 2015, and the last supported 3.x kernel
(3.16) went EOL > 4 years ago, in 2020. For reference, the current
oldest maintained kernel is 4.14 (released 2017, EOL Jan 2024).

Support for `getrandom()` (and `getentropy()`) was added to
glibc 2.25, https://sourceware.org/legacy-ml/libc-alpha/2017-02/msg00079.html,
and we already require 2.27+.

All that being said, I don't think you would encounter a current day
system, running with kernel headers older than 3.17 (released 2014) but
also having a glibc of 2.27+ (released 2018).

configure.ac

@@ -1170,12 +1170,11 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <ctime>]],
 )
 
 dnl Check for different ways of gathering OS randomness
-AC_MSG_CHECKING([for Linux getrandom syscall])
-AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h>
-  #include <sys/syscall.h>
-  #include <linux/random.h>]],
- [[ syscall(SYS_getrandom, nullptr, 32, 0); ]])],
- [ AC_MSG_RESULT([yes]); AC_DEFINE([HAVE_SYS_GETRANDOM], [1], [Define this symbol if the Linux getrandom system call is available]) ],
+AC_MSG_CHECKING([for Linux getrandom function])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+  #include <sys/random.h>]],
+ [[ getrandom(nullptr, 32, 0); ]])],
+ [ AC_MSG_RESULT([yes]); AC_DEFINE([HAVE_GETRANDOM], [1], [Define this symbol if the Linux getrandom function call is available]) ],
  [ AC_MSG_RESULT([no])]
 )
 

doc/dependencies.md

@@ -20,7 +20,7 @@ You can find installation instructions in the `build-*.md` file for your platfor
 | [Boost](../depends/packages/boost.mk) | [link](https://www.boost.org/users/download/) | [1.81.0](https://github.com/bitcoin/bitcoin/pull/26557) | [1.64.0](https://github.com/bitcoin/bitcoin/pull/22320) | No |
 | [libevent](../depends/packages/libevent.mk) | [link](https://github.com/libevent/libevent/releases) | [2.1.12-stable](https://github.com/bitcoin/bitcoin/pull/21991) | [2.1.8](https://github.com/bitcoin/bitcoin/pull/24681) | No |
 | glibc | [link](https://www.gnu.org/software/libc/) | N/A | [2.27](https://github.com/bitcoin/bitcoin/pull/27029) | Yes |
-| Linux Kernel | [link](https://www.kernel.org/) | N/A | 3.2.0 | Yes |
+| Linux Kernel | [link](https://www.kernel.org/) | N/A | [3.17.0](https://github.com/bitcoin/bitcoin/pull/27699) | Yes |
 
 ## Optional
 

src/random.cpp

@@ -28,13 +28,10 @@
 #include <sys/time.h>
 #endif
 
-#ifdef HAVE_SYS_GETRANDOM
-#include <sys/syscall.h>
-#include <linux/random.h>
-#endif
-#if defined(HAVE_GETENTROPY_RAND) && defined(MAC_OSX)
+#if defined(HAVE_GETRANDOM) || (defined(HAVE_GETENTROPY_RAND) && defined(MAC_OSX))
 #include <sys/random.h>
 #endif
+
 #ifdef HAVE_SYSCTL_ARND
 #include <sys/sysctl.h>
 #endif
@@ -284,23 +281,14 @@ void GetOSRand(unsigned char *ent32)
         RandFailure();
     }
     CryptReleaseContext(hProvider, 0);
-#elif defined(HAVE_SYS_GETRANDOM)
+#elif defined(HAVE_GETRANDOM)
     /* Linux. From the getrandom(2) man page:
      * "If the urandom source has been initialized, reads of up to 256 bytes
      * will always return as many bytes as requested and will not be
      * interrupted by signals."
      */
-    int rv = syscall(SYS_getrandom, ent32, NUM_OS_RANDOM_BYTES, 0);
-    if (rv != NUM_OS_RANDOM_BYTES) {
-        if (rv < 0 && errno == ENOSYS) {
-            /* Fallback for kernel <3.17: the return value will be -1 and errno
-             * ENOSYS if the syscall is not available, in that case fall back
-             * to /dev/urandom.
-             */
-            GetDevURandom(ent32);
-        } else {
-            RandFailure();
-        }
+    if (getrandom(ent32, NUM_OS_RANDOM_BYTES, 0) != NUM_OS_RANDOM_BYTES) {
+        RandFailure();
     }
 #elif defined(__OpenBSD__)
     /* OpenBSD. From the arc4random(3) man page: