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Fri, 4 Oct 2024 10:28:27 +0000 Received: from MN0PR11MB6304.namprd11.prod.outlook.com ([fe80::7f88:f3b1:22ec:f508]) by MN0PR11MB6304.namprd11.prod.outlook.com ([fe80::7f88:f3b1:22ec:f508%4]) with mapi id 15.20.8026.016; Fri, 4 Oct 2024 10:28:27 +0000 Date: Fri, 4 Oct 2024 18:28:13 +0800 From: Feng Tang To: Vlastimil Babka CC: Marco Elver , Andrew Morton , Christoph Lameter , Pekka Enberg , "David Rientjes" , Joonsoo Kim , "Roman Gushchin" , Hyeonggon Yoo <42.hyeyoo@gmail.com>, Andrey Konovalov , Shuah Khan , David Gow , "Danilo Krummrich" , Alexander Potapenko , "Andrey Ryabinin" , Dmitry Vyukov , Vincenzo Frascino , "linux-mm@kvack.org" , "kasan-dev@googlegroups.com" , "linux-kernel@vger.kernel.org" , Eric Dumazet Subject: Re: [PATCH v2 0/5] mm/slub: Improve data handling of krealloc() when orig_size is enabled Message-ID: References: <20240911064535.557650-1-feng.tang@intel.com> <49ef066d-d001-411e-8db7-f064bdc2104c@suse.cz> <2382d6e1-7719-4bf9-8a4a-1e2c32ee7c9f@suse.cz> Content-Type: text/plain; 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> > + > > + s = virt_to_cache(p); > > + orig_size = get_orig_size(s, (void *)p); > > + ks = s->object_size; > > > > so for kfence objects we don't get their actual allocation size but the > > potentially larger bucket size? > > > > I guess we could do: > > > > ks = kfence_ksize(p) ?: s->object_size; > > > > ? > > Hmm this probably is not the whole story, we also have: > > - memcpy(ret, kasan_reset_tag(p), ks); > + if (orig_size) > + memcpy(ret, kasan_reset_tag(p), orig_size); > > orig_size for kfence will be again s->object_size so the memcpy might be a > (read) buffer overflow from a kfence allocation. > > I think get_orig_size() should perhaps return kfence_ksize(p) for kfence > allocations, in addition to the change above. > > Or alternatively we don't change get_orig_size() (in a different commit) at > all, but __do_krealloc() will have an "if is_kfence_address()" that sets > both orig_size and ks to kfence_ksize(p) appropriately. That might be easier > to follow. > > But either way means rewriting 2 commits. I think it's indeed better to drop > the series now from -next and submit a v3. Yes, we can revert now. Sorry for the inconvenience. Thanks, Feng