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Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by merlin.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fyG2R-0001um-Ec for linux-mtd@lists.infradead.org; Fri, 07 Sep 2018 12:39:05 +0000 Received: from dude.hi.pengutronix.de ([2001:67c:670:100:1d::7]) by metis.ext.pengutronix.de with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1fyG27-0007c7-Tv; Fri, 07 Sep 2018 14:38:43 +0200 Received: from sha by dude.hi.pengutronix.de with local (Exim 4.91) (envelope-from ) id 1fyG26-00062g-KO; Fri, 07 Sep 2018 14:38:42 +0200 From: Sascha Hauer To: linux-mtd@lists.infradead.org Subject: [PATCH 22/25] ubifs: Add hashes and HMACs to default filesystem Date: Fri, 7 Sep 2018 14:36:43 +0200 Message-Id: <20180907123646.12688-23-s.hauer@pengutronix.de> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180907123646.12688-1-s.hauer@pengutronix.de> References: <20180907123646.12688-1-s.hauer@pengutronix.de> X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::7 X-SA-Exim-Mail-From: sha@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-mtd@lists.infradead.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180907_083903_672269_E7749ABE X-CRM114-Status: GOOD ( 13.29 ) X-Spam-Score: -0.0 (/) X-Spam-Report: SpamAssassin version 3.4.1 on merlin.infradead.org summary: Content analysis details: (-0.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [2001:67c:670:201:290:27ff:fe1d:cc33 listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Richard Weinberger , David Gstir , Sascha Hauer , linux-kernel@vger.kernel.org, kernel@pengutronix.de MIME-Version: 1.0 Sender: "linux-mtd" Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org This patch calculates the necessary hashes and HMACs for the default filesystem so that the dynamically created default fs can be authenticated. Signed-off-by: Sascha Hauer --- fs/ubifs/sb.c | 34 +++++++++++++++++++++++++++------- 1 file changed, 27 insertions(+), 7 deletions(-) diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c index 7f0967771c9f..ac1ed5ad126d 100644 --- a/fs/ubifs/sb.c +++ b/fs/ubifs/sb.c @@ -87,6 +87,7 @@ static int create_default_filesystem(struct ubifs_info *c) __le64 tmp_le64; __le32 tmp_le32; struct timespec64 ts; + u8 hash[UBIFS_HASH_ARR_SZ]; u8 hash_lpt[UBIFS_HASH_ARR_SZ]; /* Some functions called from here depend on the @c->key_len filed */ @@ -177,6 +178,16 @@ static int create_default_filesystem(struct ubifs_info *c) sup_flags |= UBIFS_FLG_BIGLPT; sup_flags |= UBIFS_FLG_DOUBLE_HASH; + if (ubifs_authenticated(c)) { + sup_flags |= UBIFS_FLG_AUTHENTICATION; + sup->hash_algo = cpu_to_le16(c->auth_hash_algo); + err = ubifs_hmac_wkm(c, sup->hmac_wkm); + if (err) + goto out; + } else { + sup->hash_algo = 0xffff; + } + sup->ch.node_type = UBIFS_SB_NODE; sup->key_hash = UBIFS_KEY_HASH_R5; sup->flags = cpu_to_le32(sup_flags); @@ -235,6 +246,7 @@ static int create_default_filesystem(struct ubifs_info *c) mst->empty_lebs = cpu_to_le32(main_lebs - 2); mst->idx_lebs = cpu_to_le32(1); mst->leb_cnt = cpu_to_le32(c->leb_cnt); + ubifs_copy_hash(c, hash_lpt, mst->hash_lpt); /* Calculate lprops statistics */ tmp64 = main_bytes; @@ -307,25 +319,33 @@ static int create_default_filesystem(struct ubifs_info *c) cs->ch.node_type = UBIFS_CS_NODE; - err = ubifs_write_node(c, sup, UBIFS_SB_NODE_SZ, 0, 0); + err = ubifs_write_node_hmac(c, sup, UBIFS_SB_NODE_SZ, 0, 0, + offsetof(struct ubifs_sb_node, hmac)); if (err) goto out; - err = ubifs_write_node(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM, 0); + err = ubifs_write_node(c, ino, UBIFS_INO_NODE_SZ, + main_first + DEFAULT_DATA_LEB, 0); if (err) goto out; - err = ubifs_write_node(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM + 1, - 0); + ubifs_node_calc_hash(c, ino, hash); + ubifs_copy_hash(c, hash, ubifs_branch_hash(c, br)); + + err = ubifs_write_node(c, idx, idx_node_size, main_first + DEFAULT_IDX_LEB, 0); if (err) goto out; - err = ubifs_write_node(c, idx, idx_node_size, main_first + DEFAULT_IDX_LEB, 0); + ubifs_node_calc_hash(c, idx, hash); + ubifs_copy_hash(c, hash, mst->hash_root_idx); + + err = ubifs_write_node_hmac(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM, 0, + offsetof(struct ubifs_mst_node, hmac)); if (err) goto out; - err = ubifs_write_node(c, ino, UBIFS_INO_NODE_SZ, - main_first + DEFAULT_DATA_LEB, 0); + err = ubifs_write_node_hmac(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM + 1, + 0, offsetof(struct ubifs_mst_node, hmac)); if (err) goto out;