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authorSascha Hauer <s.hauer@pengutronix.de>2018-09-07 14:36:35 +0200
committerRichard Weinberger <richard@nod.at>2018-10-23 13:48:39 +0200
commit16a26b20d2afd0cf063816725b45b12e78d5bb31 (patch)
tree3537a8eecd5da38204e443a887f4d1ed9f3cbcbe /fs/ubifs/master.c
parent823838a486888cf484e739ab37df14cb04dfddb5 (diff)
ubifs: authentication: Add hashes to index nodes
With this patch the hashes over the index nodes stored in the tree node cache are written to flash and are checked when read back from flash. The hash of the root index node is stored in the master node. During journal replay the hashes are regenerated from the read nodes and stored in the tree node cache. This means the nodes must previously be authenticated by other means. This is done in a later patch. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'fs/ubifs/master.c')
-rw-r--r--fs/ubifs/master.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/ubifs/master.c b/fs/ubifs/master.c
index 9df4a41bba52..0ca9d3513b4d 100644
--- a/fs/ubifs/master.c
+++ b/fs/ubifs/master.c
@@ -305,6 +305,8 @@ int ubifs_read_master(struct ubifs_info *c)
c->lst.total_dead = le64_to_cpu(c->mst_node->total_dead);
c->lst.total_dark = le64_to_cpu(c->mst_node->total_dark);
+ ubifs_copy_hash(c, c->mst_node->hash_root_idx, c->zroot.hash);
+
c->calc_idx_sz = c->bi.old_idx_sz;
if (c->mst_node->flags & cpu_to_le32(UBIFS_MST_NO_ORPHS))
@@ -378,6 +380,7 @@ int ubifs_write_master(struct ubifs_info *c)
c->mst_offs = offs;
c->mst_node->highest_inum = cpu_to_le64(c->highest_inum);
+ ubifs_copy_hash(c, c->zroot.hash, c->mst_node->hash_root_idx);
err = ubifs_write_node(c, c->mst_node, len, lnum, offs);
if (err)
return err;