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Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.3.3 Subject: Re: [PATCH v3] mempool: Do not use ksize() for poisoning Content-Language: en-US To: Kees Cook Cc: Andrey Konovalov , David Rientjes , Marco Elver , Vincenzo Frascino , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org References: <20221025233421.you.825-kees@kernel.org> From: Vlastimil Babka In-Reply-To: <20221025233421.you.825-kees@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1666778576; a=rsa-sha256; cv=none; b=ml0/DtjTui678TplGmKwSWodjc7m5TFIoRO0PJGnJeMvx/FkSXzie3PPfTAA5FW/URir1W oLrlD39HbFDqzInB/wvtHfSVsqrgRRNQa6OMbp1RqGPVI2MT/7Ax+LIir9jio9xtbUzlD4 kKaT5Iko45APuLjmL3CIhnZExEtavCM= ARC-Authentication-Results: i=1; imf28.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=bz4318np; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=Y45GjEJ0; dmarc=none; spf=pass (imf28.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.29 as permitted sender) smtp.mailfrom=vbabka@suse.cz ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1666778576; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=vR6f3Clxj5CrL08Ju/vI52Uneo3/xjRAjpwZPragrGg=; b=BAU1BQJKcLyrHNSfqPfuNdjK3SbJ4IdYXR1OEWIadg3FpxagU3GftBL8ztbkVT/JAyWq7z umI+ua2B2aYVwLq9mWwHA2VQCp/yYy6IvlzNMfDx5iCymQlnDNUspymH5XBKIIwlUgSpll 6Gbdg8BWwVbJnCe5M2jgZPJa8AkhYvk= X-Rspam-User: Authentication-Results: imf28.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=bz4318np; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=Y45GjEJ0; dmarc=none; spf=pass (imf28.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.29 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Rspamd-Server: rspam11 X-Stat-Signature: ycum4soc91ew1y4z9tm41oygip1e7851 X-Rspamd-Queue-Id: 08002C003E X-HE-Tag: 1666778575-196329 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: On 10/26/22 01:36, Kees Cook wrote: > Nothing appears to be using ksize() within the kmalloc-backed mempools > except the mempool poisoning logic. Use the actual pool size instead > of the ksize() to avoid needing any special handling of the memory as > needed by KASAN, UBSAN_BOUNDS, nor FORTIFY_SOURCE. > > Suggested-by: Vlastimil Babka > Link: https://lore.kernel.org/lkml/f4fc52c4-7c18-1d76-0c7a-4058ea2486b9@suse.cz/ > Cc: Andrey Konovalov > Cc: David Rientjes > Cc: Marco Elver > Cc: Vincenzo Frascino > Cc: Andrew Morton > Cc: linux-mm@kvack.org > Signed-off-by: Kees Cook Acked-by: Vlastimil Babka > --- > v3: remove ksize() calls instead of adding kmalloc_roundup_size() calls (vbabka) > v2: https://lore.kernel.org/lkml/20221018090323.never.897-kees@kernel.org/ > v1: https://lore.kernel.org/lkml/20220923202822.2667581-14-keescook@chromium.org/ > --- > mm/mempool.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/mm/mempool.c b/mm/mempool.c > index 96488b13a1ef..54204065037d 100644 > --- a/mm/mempool.c > +++ b/mm/mempool.c > @@ -58,7 +58,7 @@ static void check_element(mempool_t *pool, void *element) > { > /* Mempools backed by slab allocator */ > if (pool->free == mempool_free_slab || pool->free == mempool_kfree) { > - __check_element(pool, element, ksize(element)); > + __check_element(pool, element, (size_t)pool->pool_data); > } else if (pool->free == mempool_free_pages) { > /* Mempools backed by page allocator */ > int order = (int)(long)pool->pool_data; > @@ -81,7 +81,7 @@ static void poison_element(mempool_t *pool, void *element) > { > /* Mempools backed by slab allocator */ > if (pool->alloc == mempool_alloc_slab || pool->alloc == mempool_kmalloc) { > - __poison_element(element, ksize(element)); > + __poison_element(element, (size_t)pool->pool_data); > } else if (pool->alloc == mempool_alloc_pages) { > /* Mempools backed by page allocator */ > int order = (int)(long)pool->pool_data; > @@ -112,7 +112,7 @@ static __always_inline void kasan_poison_element(mempool_t *pool, void *element) > static void kasan_unpoison_element(mempool_t *pool, void *element) > { > if (pool->alloc == mempool_alloc_slab || pool->alloc == mempool_kmalloc) > - kasan_unpoison_range(element, __ksize(element)); > + kasan_unpoison_range(element, (size_t)pool->pool_data); > else if (pool->alloc == mempool_alloc_pages) > kasan_unpoison_pages(element, (unsigned long)pool->pool_data, > false);