From: Yi Xie <xieyi@kylinos.cn>
To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org,
decui@microsoft.com, longli@microsoft.com
Cc: linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
Yi Xie <xieyi@kylinos.cn>
Subject: [PATCH] mshv: bounds-check cpu index in vtl mmap fault handler
Date: Thu, 9 Jul 2026 10:19:47 +0800 [thread overview]
Message-ID: <20260709021947.49436-1-xieyi@kylinos.cn> (raw)
cpu is taken from pgoff & 0xffff. cpu_online() does not reject cpu >=
nr_cpu_ids, and per_cpu_ptr() can then walk off __per_cpu_offset.
Signed-off-by: Yi Xie <xieyi@kylinos.cn>
---
drivers/hv/mshv_vtl_main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hv/mshv_vtl_main.c b/drivers/hv/mshv_vtl_main.c
index 0d3d4161974f..fc50c44ac1bd 100644
--- a/drivers/hv/mshv_vtl_main.c
+++ b/drivers/hv/mshv_vtl_main.c
@@ -801,7 +801,7 @@ static vm_fault_t mshv_vtl_fault(struct vm_fault *vmf)
int cpu = vmf->pgoff & MSHV_PG_OFF_CPU_MASK;
int real_off = vmf->pgoff >> MSHV_REAL_OFF_SHIFT;
- if (!cpu_online(cpu))
+ if (cpu >= nr_cpu_ids || !cpu_online(cpu))
return VM_FAULT_SIGBUS;
/*
* CPU Hotplug is not supported in VTL2 in OpenHCL, where this kernel driver exists.
--
2.34.1
next reply other threads:[~2026-07-09 2:20 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-09 2:19 Yi Xie [this message]
2026-07-09 2:51 ` [PATCH] mshv: bounds-check cpu index in vtl mmap fault handler sashiko-bot
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