/* * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2010 * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2, * or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * xattr_id.c */ /* * This file implements code to map the 32-bit xattr id stored in the inode * into the on disk location of the xattr data. */ #include #include #include #include "squashfs_fs.h" #include "squashfs_fs_sb.h" #include "squashfs.h" #include "xattr.h" /* * Map xattr id using the xattr id look up table */ int squashfs_xattr_lookup(struct super_block *sb, unsigned int index, int *count, unsigned int *size, unsigned long long *xattr) { struct squashfs_sb_info *msblk = sb->s_fs_info; int block = SQUASHFS_XATTR_BLOCK(index); int offset = SQUASHFS_XATTR_BLOCK_OFFSET(index); u64 start_block = le64_to_cpu(msblk->xattr_id_table[block]); struct squashfs_xattr_id id; int err; err = squashfs_read_metadata(sb, &id, &start_block, &offset, sizeof(id)); if (err < 0) return err; *xattr = le64_to_cpu(id.xattr); *size = le32_to_cpu(id.size); *count = le32_to_cpu(id.count); return 0; } /* * Read uncompressed xattr id lookup table indexes from disk into memory */ __le64 *squashfs_read_xattr_id_table(struct super_block *sb, u64 start, u64 *xattr_table_start, int *xattr_ids) { unsigned int len; struct squashfs_xattr_id_table *id_table; id_table = squashfs_read_table(sb, start, sizeof(*id_table)); if (IS_ERR(id_table)) return (__le64 *) id_table; *xattr_table_start = le64_to_cpu(id_table->xattr_table_start); *xattr_ids = le32_to_cpu(id_table->xattr_ids); kfree(id_table); /* Sanity check values */ /* there is always at least one xattr id */ if (*xattr_ids == 0) return ERR_PTR(-EINVAL); /* xattr_table should be less than start */ if (*xattr_table_start >= start) return ERR_PTR(-EINVAL); len = SQUASHFS_XATTR_BLOCK_BYTES(*xattr_ids); TRACE("In read_xattr_index_table, length %d\n", len); return squashfs_read_table(sb, start + sizeof(*id_table), len); } ot/include/soc
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authorWillem de Bruijn <willemb@google.com>2017-01-02 17:19:40 -0500
committerPablo Neira Ayuso <pablo@netfilter.org>2017-01-09 17:24:53 +0100
commitf32815d21d4d8287336fb9cef4d2d9e0866214c2 (patch)
treeeedb12ee6e68b344d1ffb5df9615981394e8d07b /include/soc
parent4cc4b72c136a45aeccd86f66b0859b148b47d881 (diff)
xtables: add xt_match, xt_target and data copy_to_user functions
xt_entry_target, xt_entry_match and their private data may contain kernel data. Introduce helper functions xt_match_to_user, xt_target_to_user and xt_data_to_user that copy only the expected fields. These replace existing logic that calls copy_to_user on entire structs, then overwrites select fields. Private data is defined in xt_match and xt_target. All matches and targets that maintain kernel data store this at the tail of their private structure. Extend xt_match and xt_target with .usersize to limit how many bytes of data are copied. The remainder is cleared. If compatsize is specified, usersize can only safely be used if all fields up to usersize use platform-independent types. Otherwise, the compat_to_user callback must be defined. This patch does not yet enable the support logic. Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'include/soc')