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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id z124sm5174411pgb.6.2021.07.27.14.16.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 14:16:58 -0700 (PDT) From: Kees Cook To: linux-hardening@vger.kernel.org Cc: Kees Cook , "Gustavo A. R. Silva" , Keith Packard , Greg Kroah-Hartman , Andrew Morton , linux-kernel@vger.kernel.org, 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 Subject: [PATCH 52/64] dm integrity: Use struct_group() to zero struct journal_sector Date: Tue, 27 Jul 2021 13:58:43 -0700 Message-Id: <20210727205855.411487-53-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210727205855.411487-1-keescook@chromium.org> References: <20210727205855.411487-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1561; h=from:subject; bh=06AwgDhDm5rfSJczNzpy0ALLnPqFifOqpq/XiymXeZw=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOLkvi4WP3nwdDAQoa1QSWSWWQpEaKPsLt1Yrm3 8FcNJeSJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBziwAKCRCJcvTf3G3AJtOGD/ 4oB/qnnjc336AyH1K6CiqoIGRiODxOG/34zhnJ2L3+mEclURUs4GXvEBs+ynT4uxsaY9QUrjZhpqCp cdyjZJptJPu5bTduPuT/zB8wtiA1nclT/0pnTgoVaFym7lXLnek6LJsOD0RkPwz3jefg96VcdXLn6T TubbzJ4g0ejSYk50gFY2qrA/M/tOBn/OnNwc05C5P9FMHi9s6oV0SFXBMrqdxQCBjmbWQ6Efr9RdXD anks+/yMI/Ww+Lmq1IKQ+10f86r0m2ii3mT6s7tkBApimQWsrgRRguCOY8Ik4wqIaIQQ8IskbwjfRQ zAvsH8PTdNbFjoqR3LIZWIALOtNDkrAIG3wYkJUVq8qBNCH0Gbs5b+3ICmwcEGk1rjYJtGD1JttHO1 8dhqMnihZZQgW2QTqO9UALTRvnmppmvMGXI9t1RSj32G71bLR37OvLf8RYbb5U/ZwW1mG1NdfR18IT +53ZFRG56YQXa/CvxD25rnfVEjsakHncwqKoh+QE/qcQ0lrgJ4wN1lAf0tGqQ4EFaPskxJVADlbjmN 32hM7hI6LNVfSBDdz70anPmudlxiL2l4IWNCgn2CQFA4uwHDgkkIs+OhSEEXPGp8z4obbVQoaGhoG3 canI+R37hvHDQXuDDJFTaj6vFfN8KFalRxYZp56Y89KxykB44tLc2SwCNSPQ== 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 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. 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++) { -- 2.30.2