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ext4 crypto: partial update to namei.c for fname crypto
Modifies dx_show_leaf and dx_probe to support fname encryption. Filename encryption not yet enabled. Signed-off-by: Uday Savagaonkar <savagaon@google.com> Signed-off-by: Ildar Muslukhov <ildarm@google.com> Signed-off-by: Michael Halcrow <mhalcrow@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Michael Halcrow
Theodore Ts'o
parent
4bdfc873ba
commit
b309848644
109
fs/ext4/namei.c
109
fs/ext4/namei.c
@ -585,8 +585,10 @@ struct stats
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unsigned bcount;
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};
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static struct stats dx_show_leaf(struct dx_hash_info *hinfo, struct ext4_dir_entry_2 *de,
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int size, int show_names)
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static struct stats dx_show_leaf(struct inode *dir,
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struct dx_hash_info *hinfo,
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struct ext4_dir_entry_2 *de,
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int size, int show_names)
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{
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unsigned names = 0, space = 0;
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char *base = (char *) de;
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@ -599,12 +601,80 @@ static struct stats dx_show_leaf(struct dx_hash_info *hinfo, struct ext4_dir_ent
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{
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if (show_names)
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{
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#ifdef CONFIG_EXT4_FS_ENCRYPTION
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int len;
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char *name;
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struct ext4_str fname_crypto_str
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= {.name = NULL, .len = 0};
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struct ext4_fname_crypto_ctx *ctx = NULL;
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int res;
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name = de->name;
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len = de->name_len;
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ctx = ext4_get_fname_crypto_ctx(dir,
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EXT4_NAME_LEN);
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if (IS_ERR(ctx)) {
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printk(KERN_WARNING "Error acquiring"
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" crypto ctxt--skipping crypto\n");
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ctx = NULL;
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}
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if (ctx == NULL) {
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/* Directory is not encrypted */
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ext4fs_dirhash(de->name,
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de->name_len, &h);
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printk("%*.s:(U)%x.%u ", len,
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name, h.hash,
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(unsigned) ((char *) de
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- base));
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} else {
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/* Directory is encrypted */
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res = ext4_fname_crypto_alloc_buffer(
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ctx, de->name_len,
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&fname_crypto_str);
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if (res < 0) {
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printk(KERN_WARNING "Error "
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"allocating crypto "
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"buffer--skipping "
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"crypto\n");
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ext4_put_fname_crypto_ctx(&ctx);
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ctx = NULL;
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}
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res = ext4_fname_disk_to_usr(ctx, de,
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&fname_crypto_str);
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if (res < 0) {
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printk(KERN_WARNING "Error "
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"converting filename "
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"from disk to usr"
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"\n");
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name = "??";
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len = 2;
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} else {
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name = fname_crypto_str.name;
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len = fname_crypto_str.len;
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}
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res = ext4_fname_disk_to_hash(ctx, de,
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&h);
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if (res < 0) {
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printk(KERN_WARNING "Error "
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"converting filename "
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"from disk to htree"
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"\n");
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h.hash = 0xDEADBEEF;
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}
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printk("%*.s:(E)%x.%u ", len, name,
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h.hash, (unsigned) ((char *) de
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- base));
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ext4_put_fname_crypto_ctx(&ctx);
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ext4_fname_crypto_free_buffer(
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&fname_crypto_str);
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}
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#else
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int len = de->name_len;
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char *name = de->name;
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while (len--) printk("%c", *name++);
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ext4fs_dirhash(de->name, de->name_len, &h);
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printk(":%x.%u ", h.hash,
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printk("%*.s:%x.%u ", len, name, h.hash,
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(unsigned) ((char *) de - base));
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#endif
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}
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space += EXT4_DIR_REC_LEN(de->name_len);
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names++;
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@ -622,7 +692,6 @@ struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
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unsigned count = dx_get_count(entries), names = 0, space = 0, i;
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unsigned bcount = 0;
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struct buffer_head *bh;
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int err;
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printk("%i indexed blocks...\n", count);
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for (i = 0; i < count; i++, entries++)
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{
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@ -636,7 +705,8 @@ struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
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continue;
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stats = levels?
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dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1):
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dx_show_leaf(hinfo, (struct ext4_dir_entry_2 *) bh->b_data, blocksize, 0);
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dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *)
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bh->b_data, blocksize, 0);
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names += stats.names;
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space += stats.space;
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bcount += stats.bcount;
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@ -686,8 +756,28 @@ dx_probe(const struct qstr *d_name, struct inode *dir,
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if (hinfo->hash_version <= DX_HASH_TEA)
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hinfo->hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
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hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed;
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#ifdef CONFIG_EXT4_FS_ENCRYPTION
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if (d_name) {
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struct ext4_fname_crypto_ctx *ctx = NULL;
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int res;
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/* Check if the directory is encrypted */
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ctx = ext4_get_fname_crypto_ctx(dir, EXT4_NAME_LEN);
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if (IS_ERR(ctx)) {
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ret_err = ERR_PTR(PTR_ERR(ctx));
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goto fail;
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}
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res = ext4_fname_usr_to_hash(ctx, d_name, hinfo);
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if (res < 0) {
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ret_err = ERR_PTR(res);
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goto fail;
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}
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ext4_put_fname_crypto_ctx(&ctx);
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}
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#else
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if (d_name)
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ext4fs_dirhash(d_name->name, d_name->len, hinfo);
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#endif
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hash = hinfo->hash;
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if (root->info.unused_flags & 1) {
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@ -772,6 +862,7 @@ fail:
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brelse(frame->bh);
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frame--;
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}
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if (ret_err == ERR_PTR(ERR_BAD_DX_DIR))
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ext4_warning(dir->i_sb,
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"Corrupt dir inode %lu, running e2fsck is "
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@ -1604,8 +1695,10 @@ static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
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initialize_dirent_tail(t, blocksize);
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}
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dxtrace(dx_show_leaf (hinfo, (struct ext4_dir_entry_2 *) data1, blocksize, 1));
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dxtrace(dx_show_leaf (hinfo, (struct ext4_dir_entry_2 *) data2, blocksize, 1));
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dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data1,
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blocksize, 1));
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dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data2,
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blocksize, 1));
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/* Which block gets the new entry? */
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if (hinfo->hash >= hash2) {
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