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random.c: try getrandom

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* random.c (fill_random_bytes_syscall): try getrandom system call
  on Linux if supported by the kernel.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51182 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2015-07-07 06:26:06 +00:00
parent e96955e8f6
commit bcd96d92f3
2 changed files with 24 additions and 1 deletions
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1
common.mk
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@ -1893,6 +1893,7 @@ random.$(OBJEXT): {$(VPATH)}io.h
random.$(OBJEXT): {$(VPATH)}missing.h
random.$(OBJEXT): {$(VPATH)}oniguruma.h
random.$(OBJEXT): {$(VPATH)}random.c
random.$(OBJEXT): {$(VPATH)}ruby_atomic.h
random.$(OBJEXT): {$(VPATH)}siphash.c
random.$(OBJEXT): {$(VPATH)}siphash.h
random.$(OBJEXT): {$(VPATH)}st.h

24
random.c
View file

@ -77,6 +77,12 @@ The original copyright notice follows.
#include <sys/time.h>
#endif
#ifdef HAVE_SYSCALL_H
#include <syscall.h>
#elif defined HAVE_SYS_SYSCALL_H
#include <sys/syscall.h>
#endif
#ifdef _WIN32
# if !defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0400
# undef _WIN32_WINNT
@ -84,8 +90,8 @@ The original copyright notice follows.
# undef __WINCRYPT_H__
# endif
#include <wincrypt.h>
#include "ruby_atomic.h"
#endif
#include "ruby_atomic.h"
typedef int int_must_be_32bit_at_least[sizeof(int) * CHAR_BIT < 32 ? -1 : 1];
@ -509,6 +515,22 @@ fill_random_bytes_syscall(void *seed, size_t size)
CryptGenRandom(prov, size, seed);
return 0;
}
#elif defined __linux__ && defined SYS_getrandom
static int
fill_random_bytes_syscall(void *seed, size_t size)
{
static rb_atomic_t try_syscall = 1;
if (try_syscall) {
errno = 0;
ret = syscall(SYS_getrandom, seed, size, 0)
if (errno == ENOSYS) {
try_syscall = 0;
return -1;
}
if ((size_t)ret == size) return 0;
}
return 0;
}
#else
# define fill_random_bytes_syscall(seed, size) -1
#endif