linux-kernel - Re: [PATCH v7 6/7] mseal, system mappings: uprobe mapping

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Message-ID: <20250226162604.GA17833@redhat.com>
Date: Wed, 26 Feb 2025 17:26:04 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: jeffxu@...omium.org
Cc: akpm@...ux-foundation.org, keescook@...omium.org, jannh@...gle.com,
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Subject: Re: [PATCH v7 6/7] mseal, system mappings: uprobe mapping

On 02/24, jeffxu@...omium.org wrote:
>
> 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.

Agreed, VM_SEALED should be always for the "[uprobes]" vma, regardless
of config options.

ACK,

but can't we do

	#ifdef CONFIG_64BIT
	/* VM is sealed, in vm_flags */
	#define VM_SEALED	_BITUL(63)
+	#else
+	#define VM_SEALED	0
	#endif

and then simply

	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,

?

But I am fine either way, feel free to ignore.

Oleg.