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Fri, 2 Aug 2024 09:00:42 +0000 (UTC) Received: by dhcp-27-174.brq.redhat.com (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Fri, 2 Aug 2024 11:00:47 +0200 (CEST) Date: Fri, 2 Aug 2024 11:00:40 +0200 From: Oleg Nesterov To: Jeff Xu Cc: Kees Cook , srikar@linux.vnet.ibm.com, Ryan Roberts , "adrian.hunter@intel.com" , "glider@google.com" , Matthew Wilcox , zokeefe@google.com, hughd@google.com, luto@amacapital.net, "jmarchan@redhat.com" , "rientjes@google.com" , Thomas Gleixner , Ingo Molnar , LKML , linux-mm@kvack.org, Andrew Morton Subject: Re: question on [uprobes] special vma Message-ID: <20240802090040.GB12343@redhat.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 X-Rspam-User: X-Rspamd-Queue-Id: 920C410002F X-Rspamd-Server: rspam01 X-Stat-Signature: 4m4xzhiyegcm8t87nhqoqu4gdjr6y79t X-HE-Tag: 1722589257-767059 X-HE-Meta: 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 +cQmsWMK 0nr+xH6d7/jyvasO52Bd5khB4SVW1a0mLrKDj8nXZPsscqj0Hl0eieZbIYDiiwNyw+X02Ipq+I0Ki6+Km21401dWuLyqdJZ2Eq1p/O1yi67FJ0YCbK9RVjlqT/3wBr6X4zBb6/u7k/DBcUIUnP6FqlsH94AkYQYX3hHg190+vzsU5PvjHnByaZ8uhT8u9deD1f/zqOMV/YPuj8cwmTUv6yzW78BmHRALiNOK7daLVsX+9RgEaOuxicODfwhjXQYwLW0P1lQI5hpcbAEKhDMU9VeHf2gW+2ddHP4LrMyj2qxE3VBvuMw08Lun+eLC9xGdXEcg4eB7+UlTTo5A= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi Jeff, On 08/01, Jeff Xu wrote: > > __create_xol_area() calls _install_special_mapping() to create a vma > named [uprobes]. > > I'm trying to find out the lifetime of this uprobes vma, e.g. when it > is created, will it ever be unmapped/remapped/changed during the > lifetime of the process. > > If the uprobes vma remains the same during the lifetime of the > process, Yes, > I can call mseal on it so user space can't change it, i.e. > blocking munmap/mremap/mprotect/mmap, etc. I didn't even know about mm/mseal.c... at first glance do_mseal() just adds VM_SEALED for can_modify_vma(). So it seems that xol_add_vma() can just pass the additional VM_SEALED flag to _install_special_mapping(), no? But why it depends on CONFIG_64_BIT? Oleg.