linux-kernel - [PATCH v3 2/5] crypto: caam: Fix endless loop when RNG is already initialized

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Message-Id: <1517364040-27607-3-git-send-email-pure.logic@nexus-software.ie>
Date:   Wed, 31 Jan 2018 02:00:37 +0000
From:   Bryan O'Donoghue <pure.logic@...us-software.ie>
To:     horia.geanta@....com, aymen.sghaier@....com,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     fabio.estevam@....com, peng.fan@....com, davem@...emloft.net,
        lukas.auer@...ec.fraunhofer.de, rui.silva@...aro.org,
        ryan.harkin@...aro.org,
        Bryan O'Donoghue <pure.logic@...us-software.ie>,
        "# 4 . 12+" <stable@...r.kernel.org>
Subject: [PATCH v3 2/5] crypto: caam: Fix endless loop when RNG is already initialized

commit 1005bccd7a4a ("crypto: caam - enable instantiation of all RNG4 state
handles") introduces a control when incrementing ent_delay which contains
the following comment above it:

/*
 * If either SH were instantiated by somebody else
 * (e.g. u-boot) then it is assumed that the entropy
 * parameters are properly set and thus the function
 * setting these (kick_trng(...)) is skipped.
 * Also, if a handle was instantiated, do not change
 * the TRNG parameters.
 */

This is a problem observed when sec_init() has been run in u-boot and
and TrustZone is enabled. We can fix this by instantiating all rng state
handles in u-boot but, on the Kernel side we should ensure that this
non-terminating path is dealt with.

Fixes: 1005bccd7a4a ("crypto: caam - enable instantiation of all RNG4 state
handles")

Reported-by: Ryan Harkin <ryan.harkin@...aro.org>
Cc: "Horia Geantă" <horia.geanta@....com>
Cc: Aymen Sghaier <aymen.sghaier@....com>
Cc: Fabio Estevam <fabio.estevam@....com>
Cc: Peng Fan <peng.fan@....com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Lukas Auer <lukas.auer@...ec.fraunhofer.de>
Cc: <stable@...r.kernel.org> # 4.12+
Signed-off-by: Bryan O'Donoghue <pure.logic@...us-software.ie>
---
 drivers/crypto/caam/ctrl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index 98986d3..0a1e96b 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -704,7 +704,10 @@ static int caam_probe(struct platform_device *pdev)
 					 ent_delay);
 				kick_trng(pdev, ent_delay);
 				ent_delay += 400;
+			} else if (ctrlpriv->rng4_sh_init && inst_handles) {
+				ent_delay += 400;
 			}
+
 			/*
 			 * if instantiate_rng(...) fails, the loop will rerun
 			 * and the kick_trng(...) function will modfiy the
-- 
2.7.4