linux-hardening - Re: [PATCH v8 5/7] mseal sysmap: uprobe mapping

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Message-ID: <32d4c017-1c71-4559-b77c-2a16d0688488@lucifer.local>
Date: Mon, 3 Mar 2025 11:54:17 +0000
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: jeffxu@...omium.org
Cc: akpm@...ux-foundation.org, keescook@...omium.org, jannh@...gle.com,
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Subject: Re: [PATCH v8 5/7] mseal sysmap: uprobe mapping

On Mon, Mar 03, 2025 at 05:09:19AM +0000, jeffxu@...omium.org wrote:
> From: Jeff Xu <jeffxu@...omium.org>
>
> Provide support to mseal the uprobe mapping.
>
> Unlike other system mappings, the uprobe mapping is not
> established during program startup. However, its lifetime is the same
> as the process's lifetime. It could be sealed from creation.
>
> Test was done with perf tool, and observe the uprobe mapping is sealed.
>
> Signed-off-by: Jeff Xu <jeffxu@...omium.org>

LGTM so:

Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>

> ---
>  kernel/events/uprobes.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
> index bf2a87a0a378..98632bc47216 100644
> --- a/kernel/events/uprobes.c
> +++ b/kernel/events/uprobes.c
> @@ -1683,7 +1683,8 @@ static int xol_add_vma(struct mm_struct *mm, struct xol_area *area)
>  	}
>
>  	vma = _install_special_mapping(mm, area->vaddr, PAGE_SIZE,
> -				VM_EXEC|VM_MAYEXEC|VM_DONTCOPY|VM_IO,
> +				VM_EXEC|VM_MAYEXEC|VM_DONTCOPY|VM_IO|
> +				VM_SEALED_SYSMAP,
>  				&xol_mapping);
>  	if (IS_ERR(vma)) {
>  		ret = PTR_ERR(vma);
> --
> 2.48.1.711.g2feabab25a-goog
>