* [PATCH] Drivers: hv: vmbus: Deactivate sysctl_record_panic_msg by default in isolated guests
@ 2022-03-01 14:11 Andrea Parri (Microsoft)
2022-03-01 20:29 ` Dexuan Cui
0 siblings, 1 reply; 3+ messages in thread
From: Andrea Parri (Microsoft) @ 2022-03-01 14:11 UTC (permalink / raw)
To: KY Srinivasan, Haiyang Zhang, Stephen Hemminger, Wei Liu,
Dexuan Cui, Michael Kelley
Cc: linux-hyperv, linux-kernel, Andrea Parri (Microsoft)
hv_panic_page might contain guest-sensitive information, do not dump it
over to Hyper-V by default in isolated guests.
While at it, update some comments in hyperv_{panic,die}_event().
Reported-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
---
drivers/hv/vmbus_drv.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 12a2b37e87f30..a963b970ffb2f 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -77,8 +77,8 @@ static int hyperv_panic_event(struct notifier_block *nb, unsigned long val,
/*
* Hyper-V should be notified only once about a panic. If we will be
- * doing hyperv_report_panic_msg() later with kmsg data, don't do
- * the notification here.
+ * doing hv_kmsg_dump() with kmsg data later, don't do the notification
+ * here.
*/
if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE
&& hyperv_report_reg()) {
@@ -100,8 +100,8 @@ static int hyperv_die_event(struct notifier_block *nb, unsigned long val,
/*
* Hyper-V should be notified only once about a panic. If we will be
- * doing hyperv_report_panic_msg() later with kmsg data, don't do
- * the notification here.
+ * doing hv_kmsg_dump() with kmsg data later, don't do the notification
+ * here.
*/
if (hyperv_report_reg())
hyperv_report_panic(regs, val, true);
@@ -1546,14 +1546,20 @@ static int vmbus_bus_init(void)
if (ret)
goto err_connect;
+ if (hv_is_isolation_supported())
+ sysctl_record_panic_msg = 0;
+
/*
* Only register if the crash MSRs are available
*/
if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
u64 hyperv_crash_ctl;
/*
- * Sysctl registration is not fatal, since by default
- * reporting is enabled.
+ * Panic message recording (sysctl_record_panic_msg)
+ * is enabled by default in non-isolated guests and
+ * disabled by default in isolated guests; the panic
+ * message recording won't be available in isolated
+ * guests should the following registration fail.
*/
hv_ctl_table_hdr = register_sysctl_table(hv_root_table);
if (!hv_ctl_table_hdr)
--
2.25.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* RE: [PATCH] Drivers: hv: vmbus: Deactivate sysctl_record_panic_msg by default in isolated guests
2022-03-01 14:11 [PATCH] Drivers: hv: vmbus: Deactivate sysctl_record_panic_msg by default in isolated guests Andrea Parri (Microsoft)
@ 2022-03-01 20:29 ` Dexuan Cui
2022-03-29 12:02 ` Wei Liu
0 siblings, 1 reply; 3+ messages in thread
From: Dexuan Cui @ 2022-03-01 20:29 UTC (permalink / raw)
To: Andrea Parri (Microsoft),
KY Srinivasan, Haiyang Zhang, Stephen Hemminger, Wei Liu,
Michael Kelley (LINUX)
Cc: linux-hyperv, linux-kernel
> From: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
> Sent: Tuesday, March 1, 2022 6:12 AM
> ...
> hv_panic_page might contain guest-sensitive information, do not dump it
> over to Hyper-V by default in isolated guests.
>
> While at it, update some comments in hyperv_{panic,die}_event().
>
> Reported-by: Dexuan Cui <decui@microsoft.com>
> Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
> ---
Reviewed-by: Dexuan Cui <decui@microsoft.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] Drivers: hv: vmbus: Deactivate sysctl_record_panic_msg by default in isolated guests
2022-03-01 20:29 ` Dexuan Cui
@ 2022-03-29 12:02 ` Wei Liu
0 siblings, 0 replies; 3+ messages in thread
From: Wei Liu @ 2022-03-29 12:02 UTC (permalink / raw)
To: Dexuan Cui
Cc: Andrea Parri (Microsoft),
KY Srinivasan, Haiyang Zhang, Stephen Hemminger, Wei Liu,
Michael Kelley (LINUX),
linux-hyperv, linux-kernel
On Tue, Mar 01, 2022 at 08:29:43PM +0000, Dexuan Cui wrote:
> > From: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
> > Sent: Tuesday, March 1, 2022 6:12 AM
> > ...
> > hv_panic_page might contain guest-sensitive information, do not dump it
> > over to Hyper-V by default in isolated guests.
> >
> > While at it, update some comments in hyperv_{panic,die}_event().
> >
> > Reported-by: Dexuan Cui <decui@microsoft.com>
> > Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
> > ---
>
> Reviewed-by: Dexuan Cui <decui@microsoft.com>
Applied to hyperv-fixes. Thanks.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-03-01 14:11 [PATCH] Drivers: hv: vmbus: Deactivate sysctl_record_panic_msg by default in isolated guests Andrea Parri (Microsoft)
2022-03-01 20:29 ` Dexuan Cui
2022-03-29 12:02 ` Wei Liu
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