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58 lines
2.1 KiB
Diff
58 lines
2.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Daniel Micay <danielmicay@gmail.com>
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Date: Mon, 4 Mar 2019 04:26:04 -0500
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Subject: [PATCH] use blocking getrandom and avoid urandom fallback
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Signed-off-by: anupritaisno1 <www.anuprita804@gmail.com>
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---
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libc/bionic/getentropy.cpp | 28 +++-------------------------
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1 file changed, 3 insertions(+), 25 deletions(-)
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diff --git a/libc/bionic/getentropy.cpp b/libc/bionic/getentropy.cpp
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index 9c93e713b..c9438ad2b 100644
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--- a/libc/bionic/getentropy.cpp
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+++ b/libc/bionic/getentropy.cpp
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@@ -33,22 +33,6 @@
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#include "private/ScopedFd.h"
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-static int getentropy_urandom(void* buffer, size_t buffer_size, int saved_errno) {
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- ScopedFd fd(TEMP_FAILURE_RETRY(open("/dev/urandom", O_RDONLY | O_NOFOLLOW | O_CLOEXEC, 0)));
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- if (fd.get() == -1) return -1;
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-
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- size_t collected = 0;
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- while (collected < buffer_size) {
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- ssize_t count = TEMP_FAILURE_RETRY(read(fd.get(), static_cast<char*>(buffer) + collected,
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- buffer_size - collected));
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- if (count == -1) return -1;
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- collected += count;
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- }
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-
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- errno = saved_errno;
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- return 0;
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-}
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-
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int getentropy(void* buffer, size_t buffer_size) {
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if (buffer_size > 256) {
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errno = EIO;
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@@ -59,16 +43,10 @@ int getentropy(void* buffer, size_t buffer_size) {
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size_t collected = 0;
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while (collected < buffer_size) {
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- long count = TEMP_FAILURE_RETRY(getrandom(static_cast<char*>(buffer) + collected,
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- buffer_size - collected, GRND_NONBLOCK));
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+ long count = TEMP_FAILURE_RETRY(
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+ getrandom(static_cast<char*>(buffer) + collected, buffer_size - collected, 0));
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if (count == -1) {
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- // EAGAIN: there isn't enough entropy right now.
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- // ENOSYS/EINVAL: getrandom(2) or GRND_NONBLOCK isn't supported.
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- // EFAULT: `buffer` is invalid.
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- // Try /dev/urandom regardless because it can't hurt,
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- // and we don't need to optimize the EFAULT case.
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- // See http://b/33059407 and http://b/67015565.
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- return getentropy_urandom(buffer, buffer_size, saved_errno);
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+ return -1;
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}
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collected += count;
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}
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