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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id p24sm4878901pff.161.2021.08.17.23.24.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 23:24:12 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Alasdair Kergon , Mike Snitzer , dm-devel@redhat.com, "Gustavo A. R. Silva" , Greg Kroah-Hartman , Andrew Morton , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-staging@lists.linux.dev, linux-block@vger.kernel.org, linux-kbuild@vger.kernel.org, clang-built-linux@googlegroups.com, Rasmus Villemoes , linux-hardening@vger.kernel.org Subject: [PATCH v2 54/63] dm integrity: Use struct_group() to zero struct journal_sector Date: Tue, 17 Aug 2021 23:05:24 -0700 Message-Id: <20210818060533.3569517-55-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210818060533.3569517-1-keescook@chromium.org> References: <20210818060533.3569517-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1663; h=from:subject; bh=RPEjx0xOcNjHRBM+3EZ1vHtaj+TxiBoxNq+cj1Ac9bE=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhHKMqKJz2SoJYeKtBFLmX4tcR3DHJFXvBbKzH4heh kSEkuyiJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYRyjKgAKCRCJcvTf3G3AJuKGD/ 4n4SpuomtIZ+g22QufnnrQNKHA98zIHUxCFyPUWlldkaYq1yjxANA7kCeWzhMyhnDbNsMcPnBz0u8w gTumF2NUeGQx1DWnIYpoWchHj0biXBVmJ627d0qH4ZPJV0xVoCra7OxBNu9MzddxWpF6sdPcwkm6G6 KRyO9F4M4JhZ6wIx91tgVghgSzl5twheIhtA3njJ073Q8wNaDnBzfs/l9Ut/AzjfupZu1x3ki+jwpu WmD6nfcKbq0Iek6wuIdRHun0EOL5PBZd4fWR1bJEQePLiZZr/WzyrJktCcPBtbfNoxoh3Zd/RDOYxC Phqtb9d6KbfQDNPiqFq8A/FFx6Omeamuzt6AZrvZOtupVwaAqZxmTGL+T1t6dJrUD1sjtKDjGoNOLi 7dn6c/08XUE+My/kdCiaqMIMLvnXKeruIHQhrlJ6zoMYvFZ06D7/j39GezPIeXXaEJGwuF4EXX7UYn QzJ8yJKQqHgf3AnzSklDq7S2QgMQbMBg1H2HY21GsA89Wb8lyNm0RvImBjKDi+T7HWHtu01K2er3t2 O4+fb9meXQjoQXeBGEZ9RShjhKkgK9BaIxyiqfANsALqrrzQxMSMbRLvnALSRrEOGtrHi3ZBCAsQ/F uBwH2rx2bGKY/138CbdayzcXJ/PERuBisG0LhMFqbUDxYwVopHT1lxsnBtzA== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memset(), avoid intentionally writing across neighboring fields. Add struct_group() to mark region of struct journal_sector that should be initialized to zero. Cc: Alasdair Kergon Cc: Mike Snitzer Cc: dm-devel@redhat.com Signed-off-by: Kees Cook --- drivers/md/dm-integrity.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c index 40f8116c8e44..59deea0dd305 100644 --- a/drivers/md/dm-integrity.c +++ b/drivers/md/dm-integrity.c @@ -119,8 +119,10 @@ struct journal_entry { #define JOURNAL_MAC_SIZE (JOURNAL_MAC_PER_SECTOR * JOURNAL_BLOCK_SECTORS) struct journal_sector { - __u8 entries[JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR]; - __u8 mac[JOURNAL_MAC_PER_SECTOR]; + struct_group(sectors, + __u8 entries[JOURNAL_SECTOR_DATA - JOURNAL_MAC_PER_SECTOR]; + __u8 mac[JOURNAL_MAC_PER_SECTOR]; + ); commit_id_t commit_id; }; @@ -2856,7 +2858,8 @@ static void init_journal(struct dm_integrity_c *ic, unsigned start_section, wraparound_section(ic, &i); for (j = 0; j < ic->journal_section_sectors; j++) { struct journal_sector *js = access_journal(ic, i, j); - memset(&js->entries, 0, JOURNAL_SECTOR_DATA); + BUILD_BUG_ON(sizeof(js->sectors) != JOURNAL_SECTOR_DATA); + memset(&js->sectors, 0, sizeof(js->sectors)); js->commit_id = dm_integrity_commit_id(ic, i, j, commit_seq); } for (j = 0; j < ic->journal_section_entries; j++) {