Date: Wed, 5 Dec 2018 15:00:49 -0800 From: Kees Cook <keescook@...omium.org> To: Carter Cheng <cartercheng@...il.com> Cc: Kernel Hardening <kernel-hardening@...ts.openwall.com> Subject: Re: dynamically allocating memory in the kernel On Wed, Dec 5, 2018 at 12:46 PM Carter Cheng <cartercheng@...il.com> wrote: > > Hello, > > I was wondering if someone here could help me understand something about the kernel for a project I am working on tracking dynamically allocated memory. How many ways are there to dynamically allocate memory in the kernel presently? I know of 4. > > get_free_pages family of functions > kmalloc family (including vmalloc) vmalloc is quite different from kmalloc (see below). > slab allocation kmalloc is a type of slab allocation, so the base parts are the same. > mempools. > > Are there others? I am trying to track them all down so I have comprehensively know when all allocations occur and all "frees". I would recommend looking at KASAN hooks (which tracks use-after-free) to see if there are any areas you're missing. -Kees -- Kees Cook
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