linux-kernel - Re: [PATCH bpf-next 1/3] mm/vmalloc: introduce vmalloc

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Date:   Wed, 13 Jul 2022 21:23:48 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Song Liu <songliubraving@...com>
Cc:     Christoph Hellwig <hch@...radead.org>, Song Liu <song@...nel.org>,
        bpf <bpf@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-modules@...r.kernel.org" <linux-modules@...r.kernel.org>,
        "mcgrof@...nel.org" <mcgrof@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "mhiramat@...nel.org" <mhiramat@...nel.org>,
        "naveen.n.rao@...ux.ibm.com" <naveen.n.rao@...ux.ibm.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "anil.s.keshavamurthy@...el.com" <anil.s.keshavamurthy@...el.com>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "dave@...olabs.net" <dave@...olabs.net>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        Kernel Team <Kernel-team@...com>,
        "x86@...nel.org" <x86@...nel.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "rick.p.edgecombe@...el.com" <rick.p.edgecombe@...el.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH bpf-next 1/3] mm/vmalloc: introduce vmalloc_exec which
 allocates RO+X memory

On Wed, Jul 13, 2022 at 03:49:45PM +0000, Song Liu wrote:
> 
> 
> > On Jul 13, 2022, at 3:08 AM, Christoph Hellwig <hch@...radead.org> wrote:
> > 
> > NAK.  This is not something that should be an exported public API
> > ever.
> 
> Hmm.. I will remove EXPORT_SYMBOL_GPL (if we ever do a v2 of this..)

Even without that it really is not a vmalloc API anyway.  Executable
memory needs to be written first, so we should allocate it in that state
and only mark it executable after that write has completed.