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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Oct 14, 2024 at 10:53:32AM +0200, Vlastimil Babka wrote: > On 10/14/24 09:52, Feng Tang wrote: > > On Fri, Oct 04, 2024 at 05:52:10PM +0800, Vlastimil Babka wrote: > > Thanks for the suggestion! > > > > As there were error report about the NULL slab for big kmalloc object, how > > about the following code for > > > > __do_krealloc(const void *p, size_t new_size, gfp_t flags) > > { > > void *ret; > > size_t ks = 0; > > int orig_size = 0; > > struct kmem_cache *s = NULL; > > > > /* Check for double-free. */ > > if (likely(!ZERO_OR_NULL_PTR(p))) { > > if (!kasan_check_byte(p)) > > return NULL; > > > > ks = ksize(p); > > I think this will result in __ksize() doing > skip_orig_size_check(folio_slab(folio)->slab_cache, object); > and we don't want that? I think that's fine. As later code will re-set the orig_size anyway. > Also the checks below repeat some of the checks of ksize(). Yes, there is some redundancy, mostly the virt_to_slab() > So I think in __do_krealloc() we should do things manually to determine ks > and not call ksize(). Just not break any of the cases ksize() handles > (kfence, large kmalloc). OK, originally I tried not to expose internals of __ksize(). Let me try this way. Thanks, Feng > > > > > /* Some objects have no orig_size, like big kmalloc case */ > > if (is_kfence_address(p)) { > > orig_size = kfence_ksize(p); > > } else if (virt_to_slab(p)) { > > s = virt_to_cache(p); > > orig_size = get_orig_size(s, (void *)p); > > } > > } else { > > goto alloc_new; > > } > > > > /* If the object doesn't fit, allocate a bigger one */ > > if (new_size > ks) > > goto alloc_new; > > > > /* Zero out spare memory. */ > > if (want_init_on_alloc(flags)) { > > kasan_disable_current(); > > if (orig_size && orig_size < new_size) > > memset((void *)p + orig_size, 0, new_size - orig_size); > > else > > memset((void *)p + new_size, 0, ks - new_size); > > kasan_enable_current(); > > } > > > > /* Setup kmalloc redzone when needed */ > > if (s && slub_debug_orig_size(s) && !is_kfence_address(p)) { > > set_orig_size(s, (void *)p, new_size); > > if (s->flags & SLAB_RED_ZONE && new_size < ks) > > memset_no_sanitize_memory((void *)p + new_size, > > SLUB_RED_ACTIVE, ks - new_size); > > } > > > > p = kasan_krealloc((void *)p, new_size, flags); > > return (void *)p; > > > > alloc_new: > > ret = kmalloc_node_track_caller_noprof(new_size, flags, NUMA_NO_NODE, _RET_IP_); > > if (ret && p) { > > /* Disable KASAN checks as the object's redzone is accessed. */ > > kasan_disable_current(); > > memcpy(ret, kasan_reset_tag(p), orig_size ?: ks); > > kasan_enable_current(); > > } > > > > return ret; > > }