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Improve detection of getrandom / getentropy

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It's been reported that the 500th system call getentropy() isn't present
on Darwin Kernel Version 15.6.0 virtual machines. We work around this by
ignoring SIGSYS temporarily.
This commit is contained in:
Justine Tunney 2022-06-23 14:09:32 -07:00
parent 49905fed0b
commit e4258015b7
1 changed files with 14 additions and 1 deletions
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15
libc/rand/getrandom.c
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@ -19,6 +19,8 @@
#include "libc/bits/bits.h"
#include "libc/calls/calls.h"
#include "libc/calls/strace.internal.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/calls/struct/sigset.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/dce.h"
@ -37,6 +39,7 @@
#include "libc/sysv/consts/auxv.h"
#include "libc/sysv/consts/grnd.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/sig.h"
#include "libc/sysv/errfuns.h"
static bool have_getrandom;
@ -123,10 +126,20 @@ ssize_t getrandom(void *p, size_t n, unsigned f) {
static textstartup void getrandom_init(void) {
int e, rc;
e = errno;
struct sigaction sa, oldsa;
if (IsBsd()) {
sa.sa_flags = 0;
sa.sa_handler = SIG_IGN;
sigemptyset(&sa.sa_mask);
sigaction(SIGSYS, &sa, &oldsa);
}
if (!(rc = sys_getrandom(0, 0, 0))) {
have_getrandom = true;
}
KERNTRACE("sys_getrandom(0,0,0) → %d% m");
STRACE("sys_getrandom(0,0,0) → %d% m", rc);
if (IsBsd()) {
sigaction(SIGSYS, &oldsa, 0);
}
errno = e;
}