linux-kernel - [PATCH] [7/106] staging: hv: use sync_bitops when interacting with the hypervisor

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, 26 Apr 2011 14:12:45 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	olaf@...fle.de, haiyangz@...rosoft.com, hjanssen@...rosoft.com,
	gregkh@...e.de, ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, tim.bird@...sony.com
Subject: [PATCH] [7/106] staging: hv: use sync_bitops when interacting with the hypervisor

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Olaf Hering <olaf@...fle.de>

commit 22356585712d1ff08fbfed152edd8b386873b238 upstream.

Locking is required when tweaking bits located in a shared page, use the
sync_ version of bitops. Without this change vmbus_on_event() will miss
events and as a result, vmbus_isr() will not schedule the receive tasklet.

[Backported to 2.6.32 stable kernel by Haiyang Zhang <haiyangz@...rosoft.com>]

Signed-off-by: Olaf Hering <olaf@...fle.de>
Acked-by: Haiyang Zhang <haiyangz@...rosoft.com>
Acked-by: Hank Janssen <hjanssen@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 drivers/staging/hv/Channel.c      |    8 ++++----
 drivers/staging/hv/Connection.c   |    6 ++++--
 drivers/staging/hv/Vmbus.c        |    2 +-
 drivers/staging/hv/VmbusPrivate.h |    1 +
 4 files changed, 10 insertions(+), 7 deletions(-)

Index: linux-2.6.35.y/drivers/staging/hv/channel.c
===================================================================
--- linux-2.6.35.y.orig/drivers/staging/hv/channel.c
+++ linux-2.6.35.y/drivers/staging/hv/channel.c
@@ -78,14 +78,14 @@ static void VmbusChannelSetEvent(struct 
 
 	if (Channel->OfferMsg.MonitorAllocated) {
 		/* Each u32 represents 32 channels */
-		set_bit(Channel->OfferMsg.ChildRelId & 31,
+		sync_set_bit(Channel->OfferMsg.ChildRelId & 31,
 			(unsigned long *) gVmbusConnection.SendInterruptPage +
 			(Channel->OfferMsg.ChildRelId >> 5));
 
 		monitorPage = gVmbusConnection.MonitorPages;
 		monitorPage++; /* Get the child to parent monitor page */
 
-		set_bit(Channel->MonitorBit,
+		sync_set_bit(Channel->MonitorBit,
 			(unsigned long *)&monitorPage->TriggerGroup
 					[Channel->MonitorGroup].Pending);
 
@@ -105,7 +105,7 @@ static void VmbusChannelClearEvent(struc
 
 	if (Channel->OfferMsg.MonitorAllocated) {
 		/* Each u32 represents 32 channels */
-		clear_bit(Channel->OfferMsg.ChildRelId & 31,
+		sync_clear_bit(Channel->OfferMsg.ChildRelId & 31,
 			  (unsigned long *)gVmbusConnection.SendInterruptPage +
 			  (Channel->OfferMsg.ChildRelId >> 5));
 
@@ -113,7 +113,7 @@ static void VmbusChannelClearEvent(struc
 			(struct hv_monitor_page *)gVmbusConnection.MonitorPages;
 		monitorPage++; /* Get the child to parent monitor page */
 
-		clear_bit(Channel->MonitorBit,
+		sync_clear_bit(Channel->MonitorBit,
 			  (unsigned long *)&monitorPage->TriggerGroup
 					[Channel->MonitorGroup].Pending);
 	}
Index: linux-2.6.35.y/drivers/staging/hv/connection.c
===================================================================
--- linux-2.6.35.y.orig/drivers/staging/hv/connection.c
+++ linux-2.6.35.y/drivers/staging/hv/connection.c
@@ -292,7 +292,9 @@ void VmbusOnEvents(void)
 		for (dword = 0; dword < maxdword; dword++) {
 			if (recvInterruptPage[dword]) {
 				for (bit = 0; bit < 32; bit++) {
-					if (test_and_clear_bit(bit, (unsigned long *)&recvInterruptPage[dword])) {
+					if (sync_test_and_clear_bit(bit,
+						(unsigned long *)
+						&recvInterruptPage[dword])) {
 						relid = (dword << 5) + bit;
 						DPRINT_DBG(VMBUS, "event detected for relid - %d", relid);
 
@@ -337,7 +339,7 @@ int VmbusSetEvent(u32 childRelId)
 	DPRINT_ENTER(VMBUS);
 
 	/* Each u32 represents 32 channels */
-	set_bit(childRelId & 31,
+	sync_set_bit(childRelId & 31,
 		(unsigned long *)gVmbusConnection.SendInterruptPage +
 		(childRelId >> 5));
 
Index: linux-2.6.35.y/drivers/staging/hv/vmbus.c
===================================================================
--- linux-2.6.35.y.orig/drivers/staging/hv/vmbus.c
+++ linux-2.6.35.y/drivers/staging/hv/vmbus.c
@@ -254,7 +254,7 @@ static int VmbusOnISR(struct hv_driver *
 	event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT;
 
 	/* Since we are a child, we only need to check bit 0 */
-	if (test_and_clear_bit(0, (unsigned long *) &event->Flags32[0])) {
+	if (sync_test_and_clear_bit(0, (unsigned long *) &event->Flags32[0])) {
 		DPRINT_DBG(VMBUS, "received event %d", event->Flags32[0]);
 		ret |= 0x2;
 	}
Index: linux-2.6.35.y/drivers/staging/hv/vmbus_private.h
===================================================================
--- linux-2.6.35.y.orig/drivers/staging/hv/vmbus_private.h
+++ linux-2.6.35.y/drivers/staging/hv/vmbus_private.h
@@ -32,6 +32,7 @@
 #include "channel_interface.h"
 #include "ring_buffer.h"
 #include <linux/list.h>
+#include <asm/sync_bitops.h>
 
 
 /*
--
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/