linux-kernel - Re: [PATCH v2 4/7] arm64/modules: Add rlimit checking for arm64 modules

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Message-ID: <25951d99-8ba7-5c9e-938e-baf92395f9e0@intel.com>
Date:   Thu, 11 Oct 2018 16:47:29 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Rick Edgecombe <rick.p.edgecombe@...el.com>,
        kernel-hardening@...ts.openwall.com, daniel@...earbox.net,
        keescook@...omium.org, catalin.marinas@....com,
        will.deacon@....com, davem@...emloft.net, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org, arnd@...db.de,
        jeyu@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
        linux-s390@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-arch@...r.kernel.org
Cc:     kristen@...ux.intel.com, arjan@...ux.intel.com,
        deneen.t.dock@...el.com
Subject: Re: [PATCH v2 4/7] arm64/modules: Add rlimit checking for arm64
 modules

On 10/11/2018 04:31 PM, Rick Edgecombe wrote:
> +	if (check_inc_mod_rlimit(size))
> +		return NULL;
> +
>  	p = __vmalloc_node_range(size, MODULE_ALIGN, module_alloc_base,
>  				module_alloc_base + MODULES_VSIZE,
>  				gfp_mask, PAGE_KERNEL_EXEC, 0,
> @@ -65,6 +68,8 @@ void *module_alloc(unsigned long size)
>  		return NULL;
>  	}
>  
> +	update_mod_rlimit(p, size);

Is there a reason we couldn't just rename all of the existing per-arch
module_alloc() calls to be called, say, "arch_module_alloc()", then put
this new rlimit code in a generic helper that does:


	if (check_inc_mod_rlimit(size))
		return NULL;

	p = arch_module_alloc(...);

	...

	update_mod_rlimit(p, size);