Date: Wed, 9 May 2018 09:08:24 -0700 From: Laura Abbott <labbott@...hat.com> To: Kees Cook <keescook@...omium.org>, Matthew Wilcox <mawilcox@...rosoft.com> Cc: Rasmus Villemoes <linux@...musvillemoes.dk>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, kernel-hardening@...ts.openwall.com Subject: Re: [RFC][PATCH 00/13] Provide saturating helpers for allocation On 05/08/2018 05:42 PM, Kees Cook wrote: > This is a stab at providing three new helpers for allocation size > calculation: > > struct_size(), array_size(), and array3_size(). > > These are implemented on top of Rasmus's overflow checking functions, > and the last 8 patches are all treewide conversions of open-coded > multiplications into the various combinations of the helper functions. > > -Kees > > Obvious question (that might indicate this deserves documentation?) What's the difference between kmalloc_array(cnt, sizeof(struct blah), GFP_KERNEL); and kmalloc(array_size(cnt, struct blah), GFP_KERNEL); and when would you use one over the other? Thanks, Laura
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