linux-kernel - [PATCH 4/5] RTC/i.MX/DryIce: when locked, do not fail silently

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 14 Apr 2015 11:08:37 +0200
From:	Juergen Borleis <jbe@...gutronix.de>
To:	linux-kernel@...r.kernel.org
Cc:	rtc-linux@...glegroups.com,
	Alessandro Zummo <a.zummo@...ertech.it>,
	linux-arm-kernel@...ts.infradead.org,
	Robert Schwebel <rsc@...gutronix.de>
Subject: [PATCH 4/5] RTC/i.MX/DryIce: when locked, do not fail silently

Signed-off-by: Juergen Borleis <jbe@...gutronix.de>
Signed-off-by: Robert Schwebel <rsc@...gutronix.de>
[rsc: got NDA clearance from Freescale]
---
 drivers/rtc/rtc-imxdi.c | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/drivers/rtc/rtc-imxdi.c b/drivers/rtc/rtc-imxdi.c
index b04c64f..de1a2e4 100644
--- a/drivers/rtc/rtc-imxdi.c
+++ b/drivers/rtc/rtc-imxdi.c
@@ -581,14 +581,36 @@ static int dryice_rtc_read_time(struct device *dev, struct rtc_time *tm)
 static int dryice_rtc_set_mmss(struct device *dev, unsigned long secs)
 {
 	struct imxdi_dev *imxdi = dev_get_drvdata(dev);
+	u32 dcr, dsr;
 	int rc;
 
+	dcr = __raw_readl(imxdi->ioaddr + DCR);
+	dsr = __raw_readl(imxdi->ioaddr + DSR);
+
+	if (!(dcr & DCR_TCE) || (dsr & DSR_SVF)) {
+		if (dcr & DCR_TCHL) {
+			/* we are even more out of luck */
+			di_what_is_to_be_done(imxdi, "battery");
+			return -EPERM;
+		}
+		if ((dcr & DCR_TCSL) || (dsr & DSR_SVF)) {
+			/* we are out of luck for now */
+			di_what_is_to_be_done(imxdi, "main");
+			return -EPERM;
+		}
+	}
+
 	/* zero the fractional part first */
 	rc = di_write_wait(imxdi, 0, DTCLR);
-	if (rc == 0)
-		rc = di_write_wait(imxdi, secs, DTCMR);
+	if (rc != 0)
+		return rc;
 
-	return rc;
+	rc = di_write_wait(imxdi, secs, DTCMR);
+	if (rc != 0)
+		return rc;
+
+	return di_write_wait(imxdi, __raw_readl(imxdi->ioaddr + DCR) |
+								DCR_TCE, DCR);
 }
 
 static int dryice_rtc_alarm_irq_enable(struct device *dev,
-- 
2.1.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/