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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id h4-20020a056a00000400b0053e4baecc14sm3024810pfk.108.2022.10.28.08.53.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Oct 2022 08:53:05 -0700 (PDT) From: Kees Cook To: Andrew Morton Cc: Kees Cook , Vlastimil Babka , David Rientjes , Marco Elver , Vincenzo Frascino , linux-mm@kvack.org, Andrey Konovalov , linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH v4] mempool: Do not use ksize() for poisoning Date: Fri, 28 Oct 2022 08:53:01 -0700 Message-Id: <20221028154823.you.615-kees@kernel.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2729; h=from:subject:message-id; bh=GsDEuQtQBehTnbCGH+DSrMKEOKg+OzR12RyNGPx7PEg=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBjW/rde6AlUoHw2yv4ICZYBd0pOTO/KK1WOZNXH+JX McX6voGJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCY1v63QAKCRCJcvTf3G3AJofhEA CPPoNca2ZmUW3btRJPcPRFmWI7syDPpe2FAISaMnR9iRv/QVVTD2mr455X1lyFOIYVhH4DTPcux+k0 sEZhsoukzUH9IruZbDUxIZcGHWrfx/Ql1K37O73ygMV70nplbn0vsXXhL9Bjrql8yQbhHLhZB55F7E uhzIVjJtt1WmWjZmCTkLfnqBh0khW0nPBGZmGA2H8xKj9rGWfkdvQOvRxmAjInn+8tS1C8G3qvg4Aa x5A3uD40YTYb39yrB35KCZAZ3AAK/2HpRGJXhDRwf+KKr8UBuv/ZKwtl0uc8EGrxqzTd0wvij78ORU 7Sp32tJUDTVHixO5mf0u4ualW4epFWQEJyBRmLDhTeYjIaY59F7v8mGkmOCgBTB6e1ynLDErk+7dPt LgA5q/TAD19RDO1H/20IYnaYsJAwh9u1lQb5DF2q1gVxOcIwmG1rMq5qPRsLJMn5hXja9JSWCNLgWg CgZtaGq7G5e++BP2sgPYHw3+vxGhm8hcCXsoU/+8xrs52MwdkOjAVgk+WRdHSfzvPd60b5ELHZRNCx SOCaxipTY6GG0e+TsCJgtR3Ne8+0sDA5MVEFh+582MNGSECHMJwUwpRwYMscwr7BYrWg+WQcWUp7GR aq9xH/OtBDw7g+ImGw8UfnkI2o8xpvMAt98io1m6aisddmYX9/ZSMM6PmfYQ== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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: David Rientjes Cc: Marco Elver Cc: Vincenzo Frascino Cc: Andrew Morton Cc: linux-mm@kvack.org Acked-by: Vlastimil Babka Reviewed-by: Andrey Konovalov Signed-off-by: Kees Cook --- This replaces mempool-use-kmalloc_size_roundup-to-match-ksize-usage.patch v4: add review/ack tags, explicitly call out subject change v3: https://lore.kernel.org/lkml/20221025233421.you.825-kees@kernel.org/ 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); -- 2.34.1