linux-kernel - Re: question on [uprobes] special vma

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Message-ID: <20240802222145.GC20135@redhat.com>
Date: Sat, 3 Aug 2024 00:21:46 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Jeff Xu <jeffxu@...omium.org>
Cc: Kees Cook <keescook@...omium.org>, srikar@...ux.vnet.ibm.com,
	Ryan Roberts <ryan.roberts@....com>,
	"adrian.hunter@...el.com" <adrian.hunter@...el.com>,
	"glider@...gle.com" <glider@...gle.com>,
	Matthew Wilcox <willy@...radead.org>, zokeefe@...gle.com,
	hughd@...gle.com, luto@...capital.net,
	"jmarchan@...hat.com" <jmarchan@...hat.com>,
	"rientjes@...gle.com" <rientjes@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: question on [uprobes] special vma

On 08/02, Jeff Xu wrote:
>
> > So it seems that xol_add_vma() can just pass the additional VM_SEALED
> > flag to _install_special_mapping(), no?
> >
> Yes. Before I make that change, I want to confirm that [uprobes] VMA
> is immutable during the lifetime of the process, hence this email.

OK, thanks,

> > But why it depends on CONFIG_64_BIT?
> >
> It needn't, but the vm_flags_t in the vma struct for 32 bit is full,

Ah, indeed ;)

Thanks!

Oleg.