linux-kernel - Re: [PATCH v5 4/5] hyperv: Do not overlap the hvcall IO areas in get

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]

Message-ID: <Z34rF2wzToTZRgem@liuwe-devbox-debian-v2>
Date: Wed, 8 Jan 2025 07:36:55 +0000
From: Wei Liu <wei.liu@...nel.org>
To: Roman Kisel <romank@...ux.microsoft.com>
Cc: hpa@...or.com, kys@...rosoft.com, bp@...en8.de,
	dave.hansen@...ux.intel.com, decui@...rosoft.com,
	eahariha@...ux.microsoft.com, haiyangz@...rosoft.com,
	mingo@...hat.com, mhklinux@...look.com,
	nunodasneves@...ux.microsoft.com, tglx@...utronix.de,
	tiala@...rosoft.com, wei.liu@...nel.org,
	linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
	x86@...nel.org, apais@...rosoft.com, benhill@...rosoft.com,
	ssengar@...rosoft.com, sunilmut@...rosoft.com, vdso@...bites.dev
Subject: Re: [PATCH v5 4/5] hyperv: Do not overlap the hvcall IO areas in
 get_vtl()

On Mon, Dec 30, 2024 at 10:09:40AM -0800, Roman Kisel wrote:
> The Top-Level Functional Specification for Hyper-V, Section 3.6 [1, 2],
> disallows overlapping of the input and output hypercall areas, and
> get_vtl(void) does overlap them.
> 
> Use the output hypercall page of the current vCPU for the hypercall.
> 
> [1] https://learn.microsoft.com/en-us/virtualization/hyper-v-on-windows/tlfs/hypercall-interface
> [2] https://github.com/MicrosoftDocs/Virtualization-Documentation/tree/main/tlfs
> 
> Fixes: 8387ce06d70b ("x86/hyperv: Set Virtual Trust Level in VMBus init message")
> Signed-off-by: Roman Kisel <romank@...ux.microsoft.com>

You forgot to pick up Tianyu's Reviewed-by tag in the previous version.
In the future please make sure to collect all the tags you get from
previous review rounds.

Thanks,
Wei.

> ---
>  arch/x86/hyperv/hv_init.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
> index f82d1aefaa8a..173005e6a95d 100644
> --- a/arch/x86/hyperv/hv_init.c
> +++ b/arch/x86/hyperv/hv_init.c
> @@ -422,7 +422,7 @@ static u8 __init get_vtl(void)
>  
>  	local_irq_save(flags);
>  	input = *this_cpu_ptr(hyperv_pcpu_input_arg);
> -	output = (struct hv_output_get_vp_registers *)input;
> +	output = *this_cpu_ptr(hyperv_pcpu_output_arg);
>  
>  	memset(input, 0, struct_size(input, names, 1));
>  	input->partition_id = HV_PARTITION_ID_SELF;
> -- 
> 2.34.1
>