diff options
Diffstat (limited to 'patches/boot_time_opt/0118-give-rdrand-some-credit.patch')
-rw-r--r-- | patches/boot_time_opt/0118-give-rdrand-some-credit.patch | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/patches/boot_time_opt/0118-give-rdrand-some-credit.patch b/patches/boot_time_opt/0118-give-rdrand-some-credit.patch new file mode 100644 index 0000000..a7abd53 --- /dev/null +++ b/patches/boot_time_opt/0118-give-rdrand-some-credit.patch | |||
@@ -0,0 +1,30 @@ | |||
1 | From 7b90a7bba60360a4585cf317b092e266e6a81e76 Mon Sep 17 00:00:00 2001 | ||
2 | From: Arjan van de Ven <arjan@linux.intel.com> | ||
3 | Date: Fri, 29 Jul 2016 19:10:52 +0000 | ||
4 | Subject: [PATCH 118/126] give rdrand some credit | ||
5 | |||
6 | try to credit rdrand/rdseed with some entropy | ||
7 | |||
8 | In VMs but even modern hardware, we're super starved for entropy, and while we can | ||
9 | and do wear a tin foil hat, it's very hard to argue that | ||
10 | rdrand and rdtsc add zero entropy. | ||
11 | --- | ||
12 | drivers/char/random.c | 2 ++ | ||
13 | 1 file changed, 2 insertions(+) | ||
14 | |||
15 | diff --git a/drivers/char/random.c b/drivers/char/random.c | ||
16 | index 8ad92707e45f..1729d2e733e5 100644 | ||
17 | --- a/drivers/char/random.c | ||
18 | +++ b/drivers/char/random.c | ||
19 | @@ -1666,6 +1666,8 @@ static void init_std_data(struct entropy_store *r) | ||
20 | if (!arch_get_random_seed_long(&rv) && | ||
21 | !arch_get_random_long(&rv)) | ||
22 | rv = random_get_entropy(); | ||
23 | + else | ||
24 | + credit_entropy_bits(r, 1); | ||
25 | mix_pool_bytes(r, &rv, sizeof(rv)); | ||
26 | } | ||
27 | mix_pool_bytes(r, utsname(), sizeof(*(utsname()))); | ||
28 | -- | ||
29 | 2.15.0 | ||
30 | |||