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| author | Jason A. Donenfeld <Jason@zx2c4.com> | 2020-05-01 10:38:26 +0200 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2020-05-03 20:08:54 -0600 |
| commit | 5022a7e3f8aad07f1e2b543827830f1f18ca318d (patch) | |
| tree | a591e3550149fb74667df1d5917a669d531ae2f1 | |
| parent | e21f8816ec23e6a01529a05215a45d713d5a55b4 (diff) | |
qemu: loop entropy adding until getrandom doesn't block
Before the 256 was just a guess, which was made wrong by qemu 5.0, so
instead actually query whether or not we're all set.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
| -rw-r--r-- | src/tests/qemu/init.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/tests/qemu/init.c b/src/tests/qemu/init.c index 90bc981..3e2a237 100644 --- a/src/tests/qemu/init.c +++ b/src/tests/qemu/init.c @@ -18,6 +18,7 @@ #include <sys/types.h> #include <sys/io.h> #include <sys/ioctl.h> +#include <sys/random.h> #include <sys/reboot.h> #include <sys/utsname.h> #include <sys/sendfile.h> @@ -73,7 +74,9 @@ static void seed_rng(void) fd = open("/dev/urandom", O_WRONLY); if (fd < 0) panic("open(urandom)"); - for (int i = 0; i < 256; ++i) { + for (;;) { + if (getrandom(entropy.buffer, sizeof(entropy.buffer), GRND_NONBLOCK) != -1 || errno != EAGAIN) + break; if (ioctl(fd, RNDADDENTROPY, &entropy) < 0) panic("ioctl(urandom)"); } |