linux-kernel - Re: [PATCH mm-unstable 1/2] mseal sysmap: generic vdso vvar mapping

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Message-ID: <20250311135542-574f3a8a-525f-4e84-9f04-c9d1ded0deef@linutronix.de>
Date: Tue, 11 Mar 2025 13:59:21 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Heiko Carstens <hca@...ux.ibm.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, 
	Jeff Xu <jeffxu@...omium.org>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
	"Liam R . Howlett" <Liam.Howlett@...cle.com>, Kees Cook <kees@...nel.org>, 
	Alexander Gordeev <agordeev@...ux.ibm.com>, Sven Schnelle <svens@...ux.ibm.com>, 
	Vasily Gorbik <gor@...ux.ibm.com>, Christian Borntraeger <borntraeger@...ux.ibm.com>, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH mm-unstable 1/2] mseal sysmap: generic vdso vvar mapping

Hi Heiko,

On Tue, Mar 11, 2025 at 01:33:25PM +0100, Heiko Carstens wrote:
> With the introduction of the generic vdso data storage the VM_SEALED_SYSMAP
> vm flag must be moved from the architecture specific
> _install_special_mapping() call [1] [2] which maps the vvar mapping to
> generic code.

I think this change should be part of the merge commit between the
trees carrying the generic vdso data storage and mseal for system mappings.

https://lore.kernel.org/lkml/20250307151426.5f3c0c39@canb.auug.org.au/
https://lore.kernel.org/lkml/20250311150847.5a63db36@canb.auug.org.au/


> [1] https://lkml.kernel.org/r/20250305021711.3867874-4-jeffxu@google.com
> [2] https://lkml.kernel.org/r/20250305021711.3867874-5-jeffxu@google.com
> 
> Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
> ---
>  lib/vdso/datastore.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/vdso/datastore.c b/lib/vdso/datastore.c
> index e227fbbcb796..b7c7386c98a9 100644
> --- a/lib/vdso/datastore.c
> +++ b/lib/vdso/datastore.c
> @@ -99,7 +99,8 @@ const struct vm_special_mapping vdso_vvar_mapping = {
>  struct vm_area_struct *vdso_install_vvar_mapping(struct mm_struct *mm, unsigned long addr)
>  {
>  	return _install_special_mapping(mm, addr, VDSO_NR_PAGES * PAGE_SIZE,
> -					VM_READ | VM_MAYREAD | VM_IO | VM_DONTDUMP | VM_PFNMAP,
> +					VM_READ | VM_MAYREAD | VM_IO | VM_DONTDUMP |
> +					VM_PFNMAP | VM_SEALED_SYSMAP,
>  					&vdso_vvar_mapping);
>  }
>  
> -- 
> 2.45.2
>