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From: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
To: xen-devel@lists.xenproject.org
Cc: Ian Jackson <ian.jackson@eu.citrix.com>, Wei Liu <wl@xen.org>,
	Sergiy Kibrik <Sergiy_Kibrik@epam.com>
Subject: [XEN PATCH v1] libxl/arm: provide guests with random seed
Date: Mon, 24 May 2021 08:00:57 +0000	[thread overview]
Message-ID: <20210524080057.1773-1-Sergiy_Kibrik@epam.com> (raw)

Pass random seed via FDT, so that guests' CRNGs are better seeded early at boot.
Depending on its configuration Linux can use the seed as device randomness
or to just quickly initialize CRNG.
In either case this will provide extra randomness to further harden CRNG.

Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
---
 tools/libxl/libxl_arm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/libxl/libxl_arm.c b/tools/libxl/libxl_arm.c
index 34f8a29056..05c58a428c 100644
--- a/tools/libxl/libxl_arm.c
+++ b/tools/libxl/libxl_arm.c
@@ -342,6 +342,12 @@ static int make_chosen_node(libxl__gc *gc, void *fdt, bool ramdisk,
         if (res) return res;
     }
 
+    uint8_t seed[128];
+    res = libxl__random_bytes(gc, seed, sizeof(seed));
+    if (res) return res;
+    res = fdt_property(fdt, "rng-seed", seed, sizeof(seed));
+    if (res) return res;
+
     res = fdt_end_node(fdt);
     if (res) return res;
 
-- 
2.25.1



             reply	other threads:[~2021-05-24  9:00 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-24  8:00 Sergiy Kibrik [this message]
2021-05-24 13:03 ` [XEN PATCH v1] libxl/arm: provide guests with random seed Julien Grall
2021-05-26  9:28   ` Sergiy Kibrik
2021-05-26 16:18     ` Julien Grall
2021-05-26 18:36       ` Sergiy Kibrik

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