linux-hardening - Re: [PATCH 07/32] mm: Bring back vmalloc

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Message-ID: <3508afc0-6f03-a971-e716-999a7373951f@wdc.com>
Date:   Wed, 10 May 2023 15:05:48 +0000
From:   Johannes Thumshirn <Johannes.Thumshirn@....com>
To:     Kent Overstreet <kent.overstreet@...ux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-bcachefs@...r.kernel.org" <linux-bcachefs@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>
CC:     Kent Overstreet <kent.overstreet@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Uladzislau Rezki <urezki@...il.com>,
        "hch@...radead.org" <hch@...radead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH 07/32] mm: Bring back vmalloc_exec

On 09.05.23 18:56, Kent Overstreet wrote:
> +/**
> + * vmalloc_exec - allocate virtually contiguous, executable memory
> + * @size:	  allocation size
> + *
> + * Kernel-internal function to allocate enough pages to cover @size
> + * the page level allocator and map them into contiguous and
> + * executable kernel virtual space.
> + *
> + * For tight control over page level allocator and protection flags
> + * use __vmalloc() instead.
> + *
> + * Return: pointer to the allocated memory or %NULL on error
> + */
> +void *vmalloc_exec(unsigned long size, gfp_t gfp_mask)
> +{
> +	return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
> +			gfp_mask, PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS,
> +			NUMA_NO_NODE, __builtin_return_address(0));
> +}
> +EXPORT_SYMBOL_GPL(vmalloc_exec);

Uh W+X memory reagions.
The 90s called, they want their shellcode back.