linux-kernel - [PATCH v2 03/12] macintosh/via-pmu: Don't clear shift register interrupt flag twice

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:   Thu,  7 Jun 2018 22:24:28 -0400 (EDT)
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     Michael Schmitz <schmitzmic@...il.com>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-m68k@...ts.linux-m68k.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 03/12] macintosh/via-pmu: Don't clear shift register
 interrupt flag twice

The shift register interrupt flag gets cleared in via_pmu_interrupt()
and once again in pmu_sr_intr(). Fix this theoretical race condition.

Tested-by: Stan Johnson <userm57@...oo.com>
Signed-off-by: Finn Thain <fthain@...egraphics.com.au>
Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
 drivers/macintosh/via-pmu.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/macintosh/via-pmu.c b/drivers/macintosh/via-pmu.c
index 74065ea410bd..4c1bae5380c2 100644
--- a/drivers/macintosh/via-pmu.c
+++ b/drivers/macintosh/via-pmu.c
@@ -1458,7 +1458,6 @@ pmu_sr_intr(void)
 
 	if (in_8(&via[B]) & TREQ) {
 		printk(KERN_ERR "PMU: spurious SR intr (%x)\n", in_8(&via[B]));
-		out_8(&via[IFR], SR_INT);
 		return NULL;
 	}
 	/* The ack may not yet be low when we get the interrupt */
-- 
2.16.4