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random: switch to using getrandom() directly

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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).
This commit is contained in:
fanquake
2023-05-18 11:25:44 +01:00
parent c2ba3f5b0c
commit d5e06919db
3 changed files with 11 additions and 24 deletions
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11
configure.ac
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@@ -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])]
)