linux/fs/hfsplus/xattr.c
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

892 lines
23 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* linux/fs/hfsplus/xattr.c
*
* Vyacheslav Dubeyko <slava@dubeyko.com>
*
* Logic of processing extended attributes
*/
#include "hfsplus_fs.h"
#include <linux/posix_acl_xattr.h>
#include <linux/nls.h>
#include "xattr.h"
#include "acl.h"
static int hfsplus_removexattr(struct inode *inode, const char *name);
const struct xattr_handler *hfsplus_xattr_handlers[] = {
&hfsplus_xattr_osx_handler,
&hfsplus_xattr_user_handler,
&hfsplus_xattr_trusted_handler,
#ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
&posix_acl_access_xattr_handler,
&posix_acl_default_xattr_handler,
#endif
&hfsplus_xattr_security_handler,
NULL
};
static int strcmp_xattr_finder_info(const char *name)
{
if (name) {
return strncmp(name, HFSPLUS_XATTR_FINDER_INFO_NAME,
sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME));
}
return -1;
}
static int strcmp_xattr_acl(const char *name)
{
if (name) {
return strncmp(name, HFSPLUS_XATTR_ACL_NAME,
sizeof(HFSPLUS_XATTR_ACL_NAME));
}
return -1;
}
static bool is_known_namespace(const char *name)
{
if (strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) &&
strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) &&
strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) &&
strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN))
return false;
return true;
}
static void hfsplus_init_header_node(struct inode *attr_file,
u32 clump_size,
char *buf, u16 node_size)
{
struct hfs_bnode_desc *desc;
struct hfs_btree_header_rec *head;
u16 offset;
__be16 *rec_offsets;
u32 hdr_node_map_rec_bits;
char *bmp;
u32 used_nodes;
u32 used_bmp_bytes;
u64 tmp;
hfs_dbg(ATTR_MOD, "init_hdr_attr_file: clump %u, node_size %u\n",
clump_size, node_size);
/* The end of the node contains list of record offsets */
rec_offsets = (__be16 *)(buf + node_size);
desc = (struct hfs_bnode_desc *)buf;
desc->type = HFS_NODE_HEADER;
desc->num_recs = cpu_to_be16(HFSPLUS_BTREE_HDR_NODE_RECS_COUNT);
offset = sizeof(struct hfs_bnode_desc);
*--rec_offsets = cpu_to_be16(offset);
head = (struct hfs_btree_header_rec *)(buf + offset);
head->node_size = cpu_to_be16(node_size);
tmp = i_size_read(attr_file);
do_div(tmp, node_size);
head->node_count = cpu_to_be32(tmp);
head->free_nodes = cpu_to_be32(be32_to_cpu(head->node_count) - 1);
head->clump_size = cpu_to_be32(clump_size);
head->attributes |= cpu_to_be32(HFS_TREE_BIGKEYS | HFS_TREE_VARIDXKEYS);
head->max_key_len = cpu_to_be16(HFSPLUS_ATTR_KEYLEN - sizeof(u16));
offset += sizeof(struct hfs_btree_header_rec);
*--rec_offsets = cpu_to_be16(offset);
offset += HFSPLUS_BTREE_HDR_USER_BYTES;
*--rec_offsets = cpu_to_be16(offset);
hdr_node_map_rec_bits = 8 * (node_size - offset - (4 * sizeof(u16)));
if (be32_to_cpu(head->node_count) > hdr_node_map_rec_bits) {
u32 map_node_bits;
u32 map_nodes;
desc->next = cpu_to_be32(be32_to_cpu(head->leaf_tail) + 1);
map_node_bits = 8 * (node_size - sizeof(struct hfs_bnode_desc) -
(2 * sizeof(u16)) - 2);
map_nodes = (be32_to_cpu(head->node_count) -
hdr_node_map_rec_bits +
(map_node_bits - 1)) / map_node_bits;
be32_add_cpu(&head->free_nodes, 0 - map_nodes);
}
bmp = buf + offset;
used_nodes =
be32_to_cpu(head->node_count) - be32_to_cpu(head->free_nodes);
used_bmp_bytes = used_nodes / 8;
if (used_bmp_bytes) {
memset(bmp, 0xFF, used_bmp_bytes);
bmp += used_bmp_bytes;
used_nodes %= 8;
}
*bmp = ~(0xFF >> used_nodes);
offset += hdr_node_map_rec_bits / 8;
*--rec_offsets = cpu_to_be16(offset);
}
static int hfsplus_create_attributes_file(struct super_block *sb)
{
int err = 0;
struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
struct inode *attr_file;
struct hfsplus_inode_info *hip;
u32 clump_size;
u16 node_size = HFSPLUS_ATTR_TREE_NODE_SIZE;
char *buf;
int index, written;
struct address_space *mapping;
struct page *page;
int old_state = HFSPLUS_EMPTY_ATTR_TREE;
hfs_dbg(ATTR_MOD, "create_attr_file: ino %d\n", HFSPLUS_ATTR_CNID);
check_attr_tree_state_again:
switch (atomic_read(&sbi->attr_tree_state)) {
case HFSPLUS_EMPTY_ATTR_TREE:
if (old_state != atomic_cmpxchg(&sbi->attr_tree_state,
old_state,
HFSPLUS_CREATING_ATTR_TREE))
goto check_attr_tree_state_again;
break;
case HFSPLUS_CREATING_ATTR_TREE:
/*
* This state means that another thread is in process
* of AttributesFile creation. Theoretically, it is
* possible to be here. But really __setxattr() method
* first of all calls hfs_find_init() for lookup in
* B-tree of CatalogFile. This method locks mutex of
* CatalogFile's B-tree. As a result, if some thread
* is inside AttributedFile creation operation then
* another threads will be waiting unlocking of
* CatalogFile's B-tree's mutex. However, if code will
* change then we will return error code (-EAGAIN) from
* here. Really, it means that first try to set of xattr
* fails with error but second attempt will have success.
*/
return -EAGAIN;
case HFSPLUS_VALID_ATTR_TREE:
return 0;
case HFSPLUS_FAILED_ATTR_TREE:
return -EOPNOTSUPP;
default:
BUG();
}
attr_file = hfsplus_iget(sb, HFSPLUS_ATTR_CNID);
if (IS_ERR(attr_file)) {
pr_err("failed to load attributes file\n");
return PTR_ERR(attr_file);
}
BUG_ON(i_size_read(attr_file) != 0);
hip = HFSPLUS_I(attr_file);
clump_size = hfsplus_calc_btree_clump_size(sb->s_blocksize,
node_size,
sbi->sect_count,
HFSPLUS_ATTR_CNID);
mutex_lock(&hip->extents_lock);
hip->clump_blocks = clump_size >> sbi->alloc_blksz_shift;
mutex_unlock(&hip->extents_lock);
if (sbi->free_blocks <= (hip->clump_blocks << 1)) {
err = -ENOSPC;
goto end_attr_file_creation;
}
while (hip->alloc_blocks < hip->clump_blocks) {
err = hfsplus_file_extend(attr_file, false);
if (unlikely(err)) {
pr_err("failed to extend attributes file\n");
goto end_attr_file_creation;
}
hip->phys_size = attr_file->i_size =
(loff_t)hip->alloc_blocks << sbi->alloc_blksz_shift;
hip->fs_blocks = hip->alloc_blocks << sbi->fs_shift;
inode_set_bytes(attr_file, attr_file->i_size);
}
buf = kzalloc(node_size, GFP_NOFS);
if (!buf) {
pr_err("failed to allocate memory for header node\n");
err = -ENOMEM;
goto end_attr_file_creation;
}
hfsplus_init_header_node(attr_file, clump_size, buf, node_size);
mapping = attr_file->i_mapping;
index = 0;
written = 0;
for (; written < node_size; index++, written += PAGE_SIZE) {
void *kaddr;
page = read_mapping_page(mapping, index, NULL);
if (IS_ERR(page)) {
err = PTR_ERR(page);
goto failed_header_node_init;
}
kaddr = kmap_atomic(page);
memcpy(kaddr, buf + written,
min_t(size_t, PAGE_SIZE, node_size - written));
kunmap_atomic(kaddr);
set_page_dirty(page);
put_page(page);
}
hfsplus_mark_inode_dirty(attr_file, HFSPLUS_I_ATTR_DIRTY);
sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
if (!sbi->attr_tree)
pr_err("failed to load attributes file\n");
failed_header_node_init:
kfree(buf);
end_attr_file_creation:
iput(attr_file);
if (!err)
atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
else if (err == -ENOSPC)
atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
else
atomic_set(&sbi->attr_tree_state, HFSPLUS_FAILED_ATTR_TREE);
return err;
}
int __hfsplus_setxattr(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
int err = 0;
struct hfs_find_data cat_fd;
hfsplus_cat_entry entry;
u16 cat_entry_flags, cat_entry_type;
u16 folder_finderinfo_len = sizeof(struct DInfo) +
sizeof(struct DXInfo);
u16 file_finderinfo_len = sizeof(struct FInfo) +
sizeof(struct FXInfo);
if ((!S_ISREG(inode->i_mode) &&
!S_ISDIR(inode->i_mode)) ||
HFSPLUS_IS_RSRC(inode))
return -EOPNOTSUPP;
if (value == NULL)
return hfsplus_removexattr(inode, name);
err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
if (err) {
pr_err("can't init xattr find struct\n");
return err;
}
err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
if (err) {
pr_err("catalog searching failed\n");
goto end_setxattr;
}
if (!strcmp_xattr_finder_info(name)) {
if (flags & XATTR_CREATE) {
pr_err("xattr exists yet\n");
err = -EOPNOTSUPP;
goto end_setxattr;
}
hfs_bnode_read(cat_fd.bnode, &entry, cat_fd.entryoffset,
sizeof(hfsplus_cat_entry));
if (be16_to_cpu(entry.type) == HFSPLUS_FOLDER) {
if (size == folder_finderinfo_len) {
memcpy(&entry.folder.user_info, value,
folder_finderinfo_len);
hfs_bnode_write(cat_fd.bnode, &entry,
cat_fd.entryoffset,
sizeof(struct hfsplus_cat_folder));
hfsplus_mark_inode_dirty(inode,
HFSPLUS_I_CAT_DIRTY);
} else {
err = -ERANGE;
goto end_setxattr;
}
} else if (be16_to_cpu(entry.type) == HFSPLUS_FILE) {
if (size == file_finderinfo_len) {
memcpy(&entry.file.user_info, value,
file_finderinfo_len);
hfs_bnode_write(cat_fd.bnode, &entry,
cat_fd.entryoffset,
sizeof(struct hfsplus_cat_file));
hfsplus_mark_inode_dirty(inode,
HFSPLUS_I_CAT_DIRTY);
} else {
err = -ERANGE;
goto end_setxattr;
}
} else {
err = -EOPNOTSUPP;
goto end_setxattr;
}
goto end_setxattr;
}
if (!HFSPLUS_SB(inode->i_sb)->attr_tree) {
err = hfsplus_create_attributes_file(inode->i_sb);
if (unlikely(err))
goto end_setxattr;
}
if (hfsplus_attr_exists(inode, name)) {
if (flags & XATTR_CREATE) {
pr_err("xattr exists yet\n");
err = -EOPNOTSUPP;
goto end_setxattr;
}
err = hfsplus_delete_attr(inode, name);
if (err)
goto end_setxattr;
err = hfsplus_create_attr(inode, name, value, size);
if (err)
goto end_setxattr;
} else {
if (flags & XATTR_REPLACE) {
pr_err("cannot replace xattr\n");
err = -EOPNOTSUPP;
goto end_setxattr;
}
err = hfsplus_create_attr(inode, name, value, size);
if (err)
goto end_setxattr;
}
cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset);
if (cat_entry_type == HFSPLUS_FOLDER) {
cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode,
cat_fd.entryoffset +
offsetof(struct hfsplus_cat_folder, flags));
cat_entry_flags |= HFSPLUS_XATTR_EXISTS;
if (!strcmp_xattr_acl(name))
cat_entry_flags |= HFSPLUS_ACL_EXISTS;
hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
offsetof(struct hfsplus_cat_folder, flags),
cat_entry_flags);
hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
} else if (cat_entry_type == HFSPLUS_FILE) {
cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode,
cat_fd.entryoffset +
offsetof(struct hfsplus_cat_file, flags));
cat_entry_flags |= HFSPLUS_XATTR_EXISTS;
if (!strcmp_xattr_acl(name))
cat_entry_flags |= HFSPLUS_ACL_EXISTS;
hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
offsetof(struct hfsplus_cat_file, flags),
cat_entry_flags);
hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
} else {
pr_err("invalid catalog entry type\n");
err = -EIO;
goto end_setxattr;
}
end_setxattr:
hfs_find_exit(&cat_fd);
return err;
}
static int name_len(const char *xattr_name, int xattr_name_len)
{
int len = xattr_name_len + 1;
if (!is_known_namespace(xattr_name))
len += XATTR_MAC_OSX_PREFIX_LEN;
return len;
}
static int copy_name(char *buffer, const char *xattr_name, int name_len)
{
int len = name_len;
int offset = 0;
if (!is_known_namespace(xattr_name)) {
strncpy(buffer, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN);
offset += XATTR_MAC_OSX_PREFIX_LEN;
len += XATTR_MAC_OSX_PREFIX_LEN;
}
strncpy(buffer + offset, xattr_name, name_len);
memset(buffer + offset + name_len, 0, 1);
len += 1;
return len;
}
int hfsplus_setxattr(struct inode *inode, const char *name,
const void *value, size_t size, int flags,
const char *prefix, size_t prefixlen)
{
char *xattr_name;
int res;
xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
GFP_KERNEL);
if (!xattr_name)
return -ENOMEM;
strcpy(xattr_name, prefix);
strcpy(xattr_name + prefixlen, name);
res = __hfsplus_setxattr(inode, xattr_name, value, size, flags);
kfree(xattr_name);
return res;
}
static ssize_t hfsplus_getxattr_finder_info(struct inode *inode,
void *value, size_t size)
{
ssize_t res = 0;
struct hfs_find_data fd;
u16 entry_type;
u16 folder_rec_len = sizeof(struct DInfo) + sizeof(struct DXInfo);
u16 file_rec_len = sizeof(struct FInfo) + sizeof(struct FXInfo);
u16 record_len = max(folder_rec_len, file_rec_len);
u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)];
u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)];
if (size >= record_len) {
res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
if (res) {
pr_err("can't init xattr find struct\n");
return res;
}
res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
if (res)
goto end_getxattr_finder_info;
entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
if (entry_type == HFSPLUS_FOLDER) {
hfs_bnode_read(fd.bnode, folder_finder_info,
fd.entryoffset +
offsetof(struct hfsplus_cat_folder, user_info),
folder_rec_len);
memcpy(value, folder_finder_info, folder_rec_len);
res = folder_rec_len;
} else if (entry_type == HFSPLUS_FILE) {
hfs_bnode_read(fd.bnode, file_finder_info,
fd.entryoffset +
offsetof(struct hfsplus_cat_file, user_info),
file_rec_len);
memcpy(value, file_finder_info, file_rec_len);
res = file_rec_len;
} else {
res = -EOPNOTSUPP;
goto end_getxattr_finder_info;
}
} else
res = size ? -ERANGE : record_len;
end_getxattr_finder_info:
if (size >= record_len)
hfs_find_exit(&fd);
return res;
}
ssize_t __hfsplus_getxattr(struct inode *inode, const char *name,
void *value, size_t size)
{
struct hfs_find_data fd;
hfsplus_attr_entry *entry;
__be32 xattr_record_type;
u32 record_type;
u16 record_length = 0;
ssize_t res = 0;
if ((!S_ISREG(inode->i_mode) &&
!S_ISDIR(inode->i_mode)) ||
HFSPLUS_IS_RSRC(inode))
return -EOPNOTSUPP;
if (!strcmp_xattr_finder_info(name))
return hfsplus_getxattr_finder_info(inode, value, size);
if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
return -EOPNOTSUPP;
entry = hfsplus_alloc_attr_entry();
if (!entry) {
pr_err("can't allocate xattr entry\n");
return -ENOMEM;
}
res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd);
if (res) {
pr_err("can't init xattr find struct\n");
goto failed_getxattr_init;
}
res = hfsplus_find_attr(inode->i_sb, inode->i_ino, name, &fd);
if (res) {
if (res == -ENOENT)
res = -ENODATA;
else
pr_err("xattr searching failed\n");
goto out;
}
hfs_bnode_read(fd.bnode, &xattr_record_type,
fd.entryoffset, sizeof(xattr_record_type));
record_type = be32_to_cpu(xattr_record_type);
if (record_type == HFSPLUS_ATTR_INLINE_DATA) {
record_length = hfs_bnode_read_u16(fd.bnode,
fd.entryoffset +
offsetof(struct hfsplus_attr_inline_data,
length));
if (record_length > HFSPLUS_MAX_INLINE_DATA_SIZE) {
pr_err("invalid xattr record size\n");
res = -EIO;
goto out;
}
} else if (record_type == HFSPLUS_ATTR_FORK_DATA ||
record_type == HFSPLUS_ATTR_EXTENTS) {
pr_err("only inline data xattr are supported\n");
res = -EOPNOTSUPP;
goto out;
} else {
pr_err("invalid xattr record\n");
res = -EIO;
goto out;
}
if (size) {
hfs_bnode_read(fd.bnode, entry, fd.entryoffset,
offsetof(struct hfsplus_attr_inline_data,
raw_bytes) + record_length);
}
if (size >= record_length) {
memcpy(value, entry->inline_data.raw_bytes, record_length);
res = record_length;
} else
res = size ? -ERANGE : record_length;
out:
hfs_find_exit(&fd);
failed_getxattr_init:
hfsplus_destroy_attr_entry(entry);
return res;
}
ssize_t hfsplus_getxattr(struct inode *inode, const char *name,
void *value, size_t size,
const char *prefix, size_t prefixlen)
{
int res;
char *xattr_name;
xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
GFP_KERNEL);
if (!xattr_name)
return -ENOMEM;
strcpy(xattr_name, prefix);
strcpy(xattr_name + prefixlen, name);
res = __hfsplus_getxattr(inode, xattr_name, value, size);
kfree(xattr_name);
return res;
}
static inline int can_list(const char *xattr_name)
{
if (!xattr_name)
return 0;
return strncmp(xattr_name, XATTR_TRUSTED_PREFIX,
XATTR_TRUSTED_PREFIX_LEN) ||
capable(CAP_SYS_ADMIN);
}
static ssize_t hfsplus_listxattr_finder_info(struct dentry *dentry,
char *buffer, size_t size)
{
ssize_t res = 0;
struct inode *inode = d_inode(dentry);
struct hfs_find_data fd;
u16 entry_type;
u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)];
u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)];
unsigned long len, found_bit;
int xattr_name_len, symbols_count;
res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
if (res) {
pr_err("can't init xattr find struct\n");
return res;
}
res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
if (res)
goto end_listxattr_finder_info;
entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
if (entry_type == HFSPLUS_FOLDER) {
len = sizeof(struct DInfo) + sizeof(struct DXInfo);
hfs_bnode_read(fd.bnode, folder_finder_info,
fd.entryoffset +
offsetof(struct hfsplus_cat_folder, user_info),
len);
found_bit = find_first_bit((void *)folder_finder_info, len*8);
} else if (entry_type == HFSPLUS_FILE) {
len = sizeof(struct FInfo) + sizeof(struct FXInfo);
hfs_bnode_read(fd.bnode, file_finder_info,
fd.entryoffset +
offsetof(struct hfsplus_cat_file, user_info),
len);
found_bit = find_first_bit((void *)file_finder_info, len*8);
} else {
res = -EOPNOTSUPP;
goto end_listxattr_finder_info;
}
if (found_bit >= (len*8))
res = 0;
else {
symbols_count = sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME) - 1;
xattr_name_len =
name_len(HFSPLUS_XATTR_FINDER_INFO_NAME, symbols_count);
if (!buffer || !size) {
if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME))
res = xattr_name_len;
} else if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) {
if (size < xattr_name_len)
res = -ERANGE;
else {
res = copy_name(buffer,
HFSPLUS_XATTR_FINDER_INFO_NAME,
symbols_count);
}
}
}
end_listxattr_finder_info:
hfs_find_exit(&fd);
return res;
}
ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
ssize_t err;
ssize_t res = 0;
struct inode *inode = d_inode(dentry);
struct hfs_find_data fd;
u16 key_len = 0;
struct hfsplus_attr_key attr_key;
char *strbuf;
int xattr_name_len;
if ((!S_ISREG(inode->i_mode) &&
!S_ISDIR(inode->i_mode)) ||
HFSPLUS_IS_RSRC(inode))
return -EOPNOTSUPP;
res = hfsplus_listxattr_finder_info(dentry, buffer, size);
if (res < 0)
return res;
else if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
return (res == 0) ? -EOPNOTSUPP : res;
err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd);
if (err) {
pr_err("can't init xattr find struct\n");
return err;
}
strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN +
XATTR_MAC_OSX_PREFIX_LEN + 1, GFP_KERNEL);
if (!strbuf) {
res = -ENOMEM;
goto out;
}
err = hfsplus_find_attr(inode->i_sb, inode->i_ino, NULL, &fd);
if (err) {
if (err == -ENOENT) {
if (res == 0)
res = -ENODATA;
goto end_listxattr;
} else {
res = err;
goto end_listxattr;
}
}
for (;;) {
key_len = hfs_bnode_read_u16(fd.bnode, fd.keyoffset);
if (key_len == 0 || key_len > fd.tree->max_key_len) {
pr_err("invalid xattr key length: %d\n", key_len);
res = -EIO;
goto end_listxattr;
}
hfs_bnode_read(fd.bnode, &attr_key,
fd.keyoffset, key_len + sizeof(key_len));
if (be32_to_cpu(attr_key.cnid) != inode->i_ino)
goto end_listxattr;
xattr_name_len = NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN;
if (hfsplus_uni2asc(inode->i_sb,
(const struct hfsplus_unistr *)&fd.key->attr.key_name,
strbuf, &xattr_name_len)) {
pr_err("unicode conversion failed\n");
res = -EIO;
goto end_listxattr;
}
if (!buffer || !size) {
if (can_list(strbuf))
res += name_len(strbuf, xattr_name_len);
} else if (can_list(strbuf)) {
if (size < (res + name_len(strbuf, xattr_name_len))) {
res = -ERANGE;
goto end_listxattr;
} else
res += copy_name(buffer + res,
strbuf, xattr_name_len);
}
if (hfs_brec_goto(&fd, 1))
goto end_listxattr;
}
end_listxattr:
kfree(strbuf);
out:
hfs_find_exit(&fd);
return res;
}
static int hfsplus_removexattr(struct inode *inode, const char *name)
{
int err = 0;
struct hfs_find_data cat_fd;
u16 flags;
u16 cat_entry_type;
int is_xattr_acl_deleted = 0;
int is_all_xattrs_deleted = 0;
if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
return -EOPNOTSUPP;
if (!strcmp_xattr_finder_info(name))
return -EOPNOTSUPP;
err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
if (err) {
pr_err("can't init xattr find struct\n");
return err;
}
err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
if (err) {
pr_err("catalog searching failed\n");
goto end_removexattr;
}
err = hfsplus_delete_attr(inode, name);
if (err)
goto end_removexattr;
is_xattr_acl_deleted = !strcmp_xattr_acl(name);
is_all_xattrs_deleted = !hfsplus_attr_exists(inode, NULL);
if (!is_xattr_acl_deleted && !is_all_xattrs_deleted)
goto end_removexattr;
cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset);
if (cat_entry_type == HFSPLUS_FOLDER) {
flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset +
offsetof(struct hfsplus_cat_folder, flags));
if (is_xattr_acl_deleted)
flags &= ~HFSPLUS_ACL_EXISTS;
if (is_all_xattrs_deleted)
flags &= ~HFSPLUS_XATTR_EXISTS;
hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
offsetof(struct hfsplus_cat_folder, flags),
flags);
hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
} else if (cat_entry_type == HFSPLUS_FILE) {
flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset +
offsetof(struct hfsplus_cat_file, flags));
if (is_xattr_acl_deleted)
flags &= ~HFSPLUS_ACL_EXISTS;
if (is_all_xattrs_deleted)
flags &= ~HFSPLUS_XATTR_EXISTS;
hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
offsetof(struct hfsplus_cat_file, flags),
flags);
hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
} else {
pr_err("invalid catalog entry type\n");
err = -EIO;
goto end_removexattr;
}
end_removexattr:
hfs_find_exit(&cat_fd);
return err;
}
static int hfsplus_osx_getxattr(const struct xattr_handler *handler,
struct dentry *unused, struct inode *inode,
const char *name, void *buffer, size_t size)
{
/*
* Don't allow retrieving properly prefixed attributes
* by prepending them with "osx."
*/
if (is_known_namespace(name))
return -EOPNOTSUPP;
/*
* osx is the namespace we use to indicate an unprefixed
* attribute on the filesystem (like the ones that OS X
* creates), so we pass the name through unmodified (after
* ensuring it doesn't conflict with another namespace).
*/
return __hfsplus_getxattr(inode, name, buffer, size);
}
static int hfsplus_osx_setxattr(const struct xattr_handler *handler,
struct dentry *unused, struct inode *inode,
const char *name, const void *buffer,
size_t size, int flags)
{
/*
* Don't allow setting properly prefixed attributes
* by prepending them with "osx."
*/
if (is_known_namespace(name))
return -EOPNOTSUPP;
/*
* osx is the namespace we use to indicate an unprefixed
* attribute on the filesystem (like the ones that OS X
* creates), so we pass the name through unmodified (after
* ensuring it doesn't conflict with another namespace).
*/
return __hfsplus_setxattr(inode, name, buffer, size, flags);
}
const struct xattr_handler hfsplus_xattr_osx_handler = {
.prefix = XATTR_MAC_OSX_PREFIX,
.get = hfsplus_osx_getxattr,
.set = hfsplus_osx_setxattr,
};