mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 16:40:59 +07:00
apparmor: move to per loaddata files, instead of replicating in profiles
The loaddata sets cover more than just a single profile and should be tracked at the ns level. Move the load data files under the namespace and reference the files from the profiles via a symlink. Signed-off-by: John Johansen <john.johansen@canonical.com> Reviewed-by: Seth Arnold <seth.arnold@canonical.com> Reviewed-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
John Johansen
parent
6623ec7c4d
commit
5d5182cae4
@ -98,14 +98,11 @@ static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf,
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return ERR_PTR(-ESPIPE);
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/* freed by caller to simple_write_to_buffer */
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data = kvmalloc(sizeof(*data) + alloc_size, GFP_KERNEL);
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if (data == NULL)
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return ERR_PTR(-ENOMEM);
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kref_init(&data->count);
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data->size = copy_size;
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data->hash = NULL;
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data->abi = 0;
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data = aa_loaddata_alloc(alloc_size);
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if (IS_ERR(data))
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return data;
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data->size = copy_size;
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if (copy_from_user(data->data, userbuf, copy_size)) {
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kvfree(data);
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return ERR_PTR(-EFAULT);
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@ -213,6 +210,11 @@ static const struct file_operations aa_fs_profile_remove = {
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.llseek = default_llseek,
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};
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void __aa_bump_ns_revision(struct aa_ns *ns)
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{
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ns->revision++;
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}
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/**
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* query_data - queries a policy and writes its data to buf
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* @buf: the resulting data is stored here (NOT NULL)
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@ -559,68 +561,88 @@ static const struct file_operations aa_fs_ns_name = {
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.release = single_release,
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};
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static int rawdata_release(struct inode *inode, struct file *file)
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/* policy/raw_data/ * file ops */
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#define SEQ_RAWDATA_FOPS(NAME) \
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static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\
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{ \
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return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \
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} \
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\
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static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \
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.owner = THIS_MODULE, \
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.open = seq_rawdata_ ##NAME ##_open, \
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.read = seq_read, \
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.llseek = seq_lseek, \
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.release = seq_rawdata_release, \
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} \
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static int seq_rawdata_open(struct inode *inode, struct file *file,
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int (*show)(struct seq_file *, void *))
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{
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/* TODO: switch to loaddata when profile switched to symlink */
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aa_put_loaddata(file->private_data);
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struct aa_loaddata *data = __aa_get_loaddata(inode->i_private);
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int error;
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if (!data)
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/* lost race this ent is being reaped */
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return -ENOENT;
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error = single_open(file, show, data);
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if (error) {
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AA_BUG(file->private_data &&
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((struct seq_file *)file->private_data)->private);
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aa_put_loaddata(data);
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}
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return error;
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}
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static int seq_rawdata_release(struct inode *inode, struct file *file)
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{
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struct seq_file *seq = (struct seq_file *) file->private_data;
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if (seq)
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aa_put_loaddata(seq->private);
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return single_release(inode, file);
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}
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static int seq_rawdata_abi_show(struct seq_file *seq, void *v)
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{
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struct aa_loaddata *data = seq->private;
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seq_printf(seq, "v%d\n", data->abi);
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return 0;
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}
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static int aa_fs_seq_raw_abi_show(struct seq_file *seq, void *v)
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static int seq_rawdata_revision_show(struct seq_file *seq, void *v)
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{
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struct aa_proxy *proxy = seq->private;
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struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
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struct aa_loaddata *data = seq->private;
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if (profile->rawdata->abi)
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seq_printf(seq, "v%d\n", profile->rawdata->abi);
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aa_put_profile(profile);
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seq_printf(seq, "%ld\n", data->revision);
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return 0;
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}
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static int aa_fs_seq_raw_abi_open(struct inode *inode, struct file *file)
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static int seq_rawdata_hash_show(struct seq_file *seq, void *v)
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{
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return aa_fs_seq_profile_open(inode, file, aa_fs_seq_raw_abi_show);
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}
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static const struct file_operations aa_fs_seq_raw_abi_fops = {
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.owner = THIS_MODULE,
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.open = aa_fs_seq_raw_abi_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = aa_fs_seq_profile_release,
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};
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static int aa_fs_seq_raw_hash_show(struct seq_file *seq, void *v)
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{
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struct aa_proxy *proxy = seq->private;
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struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
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struct aa_loaddata *data = seq->private;
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unsigned int i, size = aa_hash_size();
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if (profile->rawdata->hash) {
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if (data->hash) {
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for (i = 0; i < size; i++)
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seq_printf(seq, "%.2x", profile->rawdata->hash[i]);
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seq_printf(seq, "%.2x", data->hash[i]);
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seq_putc(seq, '\n');
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}
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aa_put_profile(profile);
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return 0;
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}
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static int aa_fs_seq_raw_hash_open(struct inode *inode, struct file *file)
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{
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return aa_fs_seq_profile_open(inode, file, aa_fs_seq_raw_hash_show);
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}
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static const struct file_operations aa_fs_seq_raw_hash_fops = {
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.owner = THIS_MODULE,
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.open = aa_fs_seq_raw_hash_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = aa_fs_seq_profile_release,
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};
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SEQ_RAWDATA_FOPS(abi);
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SEQ_RAWDATA_FOPS(revision);
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SEQ_RAWDATA_FOPS(hash);
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static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
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loff_t *ppos)
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@ -631,27 +653,120 @@ static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
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rawdata->size);
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}
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static int rawdata_open(struct inode *inode, struct file *file)
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static int rawdata_release(struct inode *inode, struct file *file)
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{
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struct aa_proxy *proxy = inode->i_private;
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struct aa_profile *profile;
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if (!policy_view_capable(NULL))
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return -EACCES;
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profile = aa_get_profile_rcu(&proxy->profile);
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file->private_data = aa_get_loaddata(profile->rawdata);
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aa_put_profile(profile);
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aa_put_loaddata(file->private_data);
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return 0;
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}
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static const struct file_operations aa_fs_rawdata_fops = {
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static int rawdata_open(struct inode *inode, struct file *file)
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{
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if (!policy_view_capable(NULL))
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return -EACCES;
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file->private_data = __aa_get_loaddata(inode->i_private);
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if (!file->private_data)
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/* lost race: this entry is being reaped */
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return -ENOENT;
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return 0;
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}
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static const struct file_operations rawdata_fops = {
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.open = rawdata_open,
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.read = rawdata_read,
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.llseek = generic_file_llseek,
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.release = rawdata_release,
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};
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static void remove_rawdata_dents(struct aa_loaddata *rawdata)
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{
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int i;
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for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) {
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if (!IS_ERR_OR_NULL(rawdata->dents[i])) {
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/* no refcounts on i_private */
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securityfs_remove(rawdata->dents[i]);
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rawdata->dents[i] = NULL;
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}
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}
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}
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void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata)
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{
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AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock));
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if (rawdata->ns) {
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remove_rawdata_dents(rawdata);
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list_del_init(&rawdata->list);
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aa_put_ns(rawdata->ns);
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rawdata->ns = NULL;
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}
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}
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int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata)
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{
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struct dentry *dent, *dir;
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AA_BUG(!ns);
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AA_BUG(!rawdata);
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AA_BUG(!mutex_is_locked(&ns->lock));
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AA_BUG(!ns_subdata_dir(ns));
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/*
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* just use ns revision dir was originally created at. This is
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* under ns->lock and if load is successful revision will be
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* bumped and is guaranteed to be unique
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*/
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rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision);
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if (!rawdata->name)
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return -ENOMEM;
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dir = securityfs_create_dir(rawdata->name, ns_subdata_dir(ns));
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if (IS_ERR(dir))
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/* ->name freed when rawdata freed */
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return PTR_ERR(dir);
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rawdata->dents[AAFS_LOADDATA_DIR] = dir;
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dent = securityfs_create_file("abi", S_IFREG | 0444, dir, rawdata,
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&seq_rawdata_abi_fops);
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if (IS_ERR(dent))
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goto fail;
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rawdata->dents[AAFS_LOADDATA_ABI] = dent;
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dent = securityfs_create_file("revision", S_IFREG | 0444, dir, rawdata,
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&seq_rawdata_revision_fops);
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if (IS_ERR(dent))
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goto fail;
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rawdata->dents[AAFS_LOADDATA_REVISION] = dent;
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if (aa_g_hash_policy) {
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dent = securityfs_create_file("sha1", S_IFREG | 0444, dir,
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rawdata, &seq_rawdata_hash_fops);
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if (IS_ERR(dent))
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goto fail;
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rawdata->dents[AAFS_LOADDATA_HASH] = dent;
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}
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dent = securityfs_create_file("raw_data", S_IFREG | 0444,
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dir, rawdata, &rawdata_fops);
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if (IS_ERR(dent))
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goto fail;
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rawdata->dents[AAFS_LOADDATA_DATA] = dent;
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d_inode(dent)->i_size = rawdata->size;
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rawdata->ns = aa_get_ns(ns);
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list_add(&rawdata->list, &ns->rawdata_list);
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/* no refcount on inode rawdata */
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return 0;
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fail:
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remove_rawdata_dents(rawdata);
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return PTR_ERR(dent);
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}
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/** fns to setup dynamic per profile/namespace files **/
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void __aa_fs_profile_rmdir(struct aa_profile *profile)
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{
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@ -703,7 +818,41 @@ static struct dentry *create_profile_file(struct dentry *dir, const char *name,
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return dent;
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}
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/* requires lock be held */
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static int profile_depth(struct aa_profile *profile)
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{
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int depth = 0;
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rcu_read_lock();
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for (depth = 0; profile; profile = rcu_access_pointer(profile->parent))
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depth++;
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rcu_read_unlock();
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return depth;
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}
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static int gen_symlink_name(char *buffer, size_t bsize, int depth,
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const char *dirname, const char *fname)
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{
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int error;
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for (; depth > 0; depth--) {
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if (bsize < 7)
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return -ENAMETOOLONG;
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strcpy(buffer, "../../");
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buffer += 6;
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bsize -= 6;
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}
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error = snprintf(buffer, bsize, "raw_data/%s/%s", dirname, fname);
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if (error >= bsize || error < 0)
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return -ENAMETOOLONG;
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return 0;
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}
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/*
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* Requires: @profile->ns->lock held
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*/
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int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
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{
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struct aa_profile *child;
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@ -766,26 +915,35 @@ int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
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}
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if (profile->rawdata) {
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dent = create_profile_file(dir, "raw_sha1", profile,
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&aa_fs_seq_raw_hash_fops);
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char target[64];
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int depth = profile_depth(profile);
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error = gen_symlink_name(target, sizeof(target), depth,
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profile->rawdata->name, "sha1");
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if (error < 0)
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goto fail2;
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dent = securityfs_create_symlink("raw_sha1", dir, target, NULL);
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if (IS_ERR(dent))
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goto fail;
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profile->dents[AAFS_PROF_RAW_HASH] = dent;
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dent = create_profile_file(dir, "raw_abi", profile,
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&aa_fs_seq_raw_abi_fops);
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error = gen_symlink_name(target, sizeof(target), depth,
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profile->rawdata->name, "abi");
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if (error < 0)
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goto fail2;
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dent = securityfs_create_symlink("raw_abi", dir, target, NULL);
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if (IS_ERR(dent))
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goto fail;
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profile->dents[AAFS_PROF_RAW_ABI] = dent;
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dent = securityfs_create_file("raw_data", S_IFREG | 0444, dir,
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profile->proxy,
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&aa_fs_rawdata_fops);
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error = gen_symlink_name(target, sizeof(target), depth,
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profile->rawdata->name, "raw_data");
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if (error < 0)
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goto fail2;
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dent = securityfs_create_symlink("raw_data", dir, target, NULL);
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if (IS_ERR(dent))
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goto fail;
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profile->dents[AAFS_PROF_RAW_DATA] = dent;
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d_inode(dent)->i_size = profile->rawdata->size;
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aa_get_proxy(profile->proxy);
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}
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list_for_each_entry(child, &profile->base.profiles, base.list) {
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@ -805,6 +963,16 @@ int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
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return error;
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}
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static void __aa_fs_list_remove_rawdata(struct aa_ns *ns)
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{
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struct aa_loaddata *ent, *tmp;
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AA_BUG(!mutex_is_locked(&ns->lock));
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list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list)
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__aa_fs_remove_rawdata(ent);
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}
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void __aa_fs_ns_rmdir(struct aa_ns *ns)
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{
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struct aa_ns *sub;
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@ -823,6 +991,8 @@ void __aa_fs_ns_rmdir(struct aa_ns *ns)
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mutex_unlock(&sub->lock);
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}
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__aa_fs_list_remove_rawdata(ns);
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if (ns_subns_dir(ns)) {
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sub = d_inode(ns_subns_dir(ns))->i_private;
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aa_put_ns(sub);
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@ -106,6 +106,7 @@ enum aafs_prof_type {
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#define prof_dir(X) ((X)->dents[AAFS_PROF_DIR])
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#define prof_child_dir(X) ((X)->dents[AAFS_PROF_PROFS])
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void __aa_bump_ns_revision(struct aa_ns *ns);
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void __aa_fs_profile_rmdir(struct aa_profile *profile);
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void __aa_fs_profile_migrate_dents(struct aa_profile *old,
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struct aa_profile *new);
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@ -114,4 +115,8 @@ void __aa_fs_ns_rmdir(struct aa_ns *ns);
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int __aa_fs_ns_mkdir(struct aa_ns *ns, struct dentry *parent,
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const char *name);
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struct aa_loaddata;
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void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata);
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int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata);
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#endif /* __AA_APPARMORFS_H */
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@ -68,6 +68,9 @@ struct aa_ns {
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atomic_t uniq_null;
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long uniq_id;
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int level;
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long revision;
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struct list_head rawdata_list;
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struct dentry *dents[AAFS_NS_SIZEOF];
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};
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@ -17,6 +17,8 @@
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#include <linux/list.h>
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#include <linux/kref.h>
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#include <linux/dcache.h>
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#include <linux/workqueue.h>
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struct aa_load_ent {
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struct list_head list;
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@ -36,26 +38,84 @@ struct aa_load_ent *aa_load_ent_alloc(void);
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#define PACKED_MODE_KILL 2
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#define PACKED_MODE_UNCONFINED 3
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|
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/* struct aa_loaddata - buffer of policy load data set */
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struct aa_ns;
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enum {
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AAFS_LOADDATA_ABI = 0,
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AAFS_LOADDATA_REVISION,
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AAFS_LOADDATA_HASH,
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AAFS_LOADDATA_DATA,
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AAFS_LOADDATA_DIR, /* must be last actual entry */
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AAFS_LOADDATA_NDENTS /* count of entries */
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||||
};
|
||||
|
||||
/*
|
||||
* struct aa_loaddata - buffer of policy raw_data set
|
||||
*
|
||||
* there is no loaddata ref for being on ns list, nor a ref from
|
||||
* d_inode(@dentry) when grab a ref from these, @ns->lock must be held
|
||||
* && __aa_get_loaddata() needs to be used, and the return value
|
||||
* checked, if NULL the loaddata is already being reaped and should be
|
||||
* considered dead.
|
||||
*/
|
||||
struct aa_loaddata {
|
||||
struct kref count;
|
||||
struct list_head list;
|
||||
struct work_struct work;
|
||||
struct dentry *dents[AAFS_LOADDATA_NDENTS];
|
||||
struct aa_ns *ns;
|
||||
char *name;
|
||||
size_t size;
|
||||
long revision; /* the ns policy revision this caused */
|
||||
int abi;
|
||||
unsigned char *hash;
|
||||
|
||||
char data[];
|
||||
};
|
||||
|
||||
int aa_unpack(struct aa_loaddata *udata, struct list_head *lh, const char **ns);
|
||||
|
||||
/**
|
||||
* __aa_get_loaddata - get a reference count to uncounted data reference
|
||||
* @data: reference to get a count on
|
||||
*
|
||||
* Returns: pointer to reference OR NULL if race is lost and reference is
|
||||
* being repeated.
|
||||
* Requires: @data->ns->lock held, and the return code MUST be checked
|
||||
*
|
||||
* Use only from inode->i_private and @data->list found references
|
||||
*/
|
||||
static inline struct aa_loaddata *
|
||||
__aa_get_loaddata(struct aa_loaddata *data)
|
||||
{
|
||||
if (data && kref_get_unless_zero(&(data->count)))
|
||||
return data;
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* aa_get_loaddata - get a reference count from a counted data reference
|
||||
* @data: reference to get a count on
|
||||
*
|
||||
* Returns: point to reference
|
||||
* Requires: @data to have a valid reference count on it. It is a bug
|
||||
* if the race to reap can be encountered when it is used.
|
||||
*/
|
||||
static inline struct aa_loaddata *
|
||||
aa_get_loaddata(struct aa_loaddata *data)
|
||||
{
|
||||
if (data)
|
||||
kref_get(&(data->count));
|
||||
return data;
|
||||
struct aa_loaddata *tmp = __aa_get_loaddata(data);
|
||||
|
||||
AA_BUG(data && !tmp);
|
||||
|
||||
return tmp;
|
||||
}
|
||||
|
||||
void __aa_loaddata_update(struct aa_loaddata *data, long revision);
|
||||
bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r);
|
||||
void aa_loaddata_kref(struct kref *kref);
|
||||
struct aa_loaddata *aa_loaddata_alloc(size_t size);
|
||||
static inline void aa_put_loaddata(struct aa_loaddata *data)
|
||||
{
|
||||
if (data)
|
||||
|
||||
@ -840,10 +840,13 @@ ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_profile *profile,
|
||||
const char *ns_name, *info = NULL;
|
||||
struct aa_ns *ns = NULL;
|
||||
struct aa_load_ent *ent, *tmp;
|
||||
struct aa_loaddata *rawdata_ent;
|
||||
const char *op = OP_PROF_REPL;
|
||||
ssize_t count, error;
|
||||
|
||||
LIST_HEAD(lh);
|
||||
|
||||
aa_get_loaddata(udata);
|
||||
/* released below */
|
||||
error = aa_unpack(udata, &lh, &ns_name);
|
||||
if (error)
|
||||
@ -887,9 +890,24 @@ ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_profile *profile,
|
||||
ns = aa_get_ns(view);
|
||||
|
||||
mutex_lock(&ns->lock);
|
||||
/* check for duplicate rawdata blobs: space and file dedup */
|
||||
list_for_each_entry(rawdata_ent, &ns->rawdata_list, list) {
|
||||
if (aa_rawdata_eq(rawdata_ent, udata)) {
|
||||
struct aa_loaddata *tmp;
|
||||
|
||||
tmp = __aa_get_loaddata(rawdata_ent);
|
||||
/* check we didn't fail the race */
|
||||
if (tmp) {
|
||||
aa_put_loaddata(udata);
|
||||
udata = tmp;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
/* setup parent and ns info */
|
||||
list_for_each_entry(ent, &lh, list) {
|
||||
struct aa_policy *policy;
|
||||
|
||||
ent->new->rawdata = aa_get_loaddata(udata);
|
||||
error = __lookup_replace(ns, ent->new->base.hname, noreplace,
|
||||
&ent->old, &info);
|
||||
@ -929,6 +947,14 @@ ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_profile *profile,
|
||||
}
|
||||
|
||||
/* create new fs entries for introspection if needed */
|
||||
if (!udata->dents[AAFS_LOADDATA_DIR]) {
|
||||
error = __aa_fs_create_rawdata(ns, udata);
|
||||
if (error) {
|
||||
info = "failed to create raw_data dir and files";
|
||||
ent = NULL;
|
||||
goto fail_lock;
|
||||
}
|
||||
}
|
||||
list_for_each_entry(ent, &lh, list) {
|
||||
if (ent->old) {
|
||||
/* inherit old interface files */
|
||||
@ -955,10 +981,24 @@ ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_profile *profile,
|
||||
}
|
||||
|
||||
/* Done with checks that may fail - do actual replacement */
|
||||
__aa_bump_ns_revision(ns);
|
||||
__aa_loaddata_update(udata, ns->revision);
|
||||
list_for_each_entry_safe(ent, tmp, &lh, list) {
|
||||
list_del_init(&ent->list);
|
||||
op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL;
|
||||
|
||||
if (ent->old && ent->old->rawdata == ent->new->rawdata) {
|
||||
/* dedup actual profile replacement */
|
||||
audit_policy(profile, op, ns_name, ent->new->base.hname,
|
||||
"same as current profile, skipping",
|
||||
error);
|
||||
goto skip;
|
||||
}
|
||||
|
||||
/*
|
||||
* TODO: finer dedup based on profile range in data. Load set
|
||||
* can differ but profile may remain unchanged
|
||||
*/
|
||||
audit_policy(profile, op, NULL, ent->new->base.hname,
|
||||
NULL, error);
|
||||
|
||||
@ -998,12 +1038,14 @@ ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_profile *profile,
|
||||
aa_get_profile(ent->new));
|
||||
__list_add_profile(&ns->base.profiles, ent->new);
|
||||
}
|
||||
skip:
|
||||
aa_load_ent_free(ent);
|
||||
}
|
||||
mutex_unlock(&ns->lock);
|
||||
|
||||
out:
|
||||
aa_put_ns(ns);
|
||||
aa_put_loaddata(udata);
|
||||
|
||||
if (error)
|
||||
return error;
|
||||
@ -1013,7 +1055,7 @@ ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_profile *profile,
|
||||
mutex_unlock(&ns->lock);
|
||||
|
||||
/* audit cause of failure */
|
||||
op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL;
|
||||
op = (ent && !ent->old) ? OP_PROF_LOAD : OP_PROF_REPL;
|
||||
fail:
|
||||
audit_policy(profile, op, ns_name, ent ? ent->new->base.hname : NULL,
|
||||
info, error);
|
||||
@ -1085,6 +1127,7 @@ ssize_t aa_remove_profiles(struct aa_ns *view, struct aa_profile *subj,
|
||||
/* remove namespace - can only happen if fqname[0] == ':' */
|
||||
mutex_lock(&ns->parent->lock);
|
||||
__aa_remove_ns(ns);
|
||||
__aa_bump_ns_revision(ns);
|
||||
mutex_unlock(&ns->parent->lock);
|
||||
} else {
|
||||
/* remove profile */
|
||||
@ -1097,6 +1140,7 @@ ssize_t aa_remove_profiles(struct aa_ns *view, struct aa_profile *subj,
|
||||
}
|
||||
name = profile->base.hname;
|
||||
__remove_profile(profile);
|
||||
__aa_bump_ns_revision(ns);
|
||||
mutex_unlock(&ns->lock);
|
||||
}
|
||||
|
||||
|
||||
@ -99,6 +99,7 @@ static struct aa_ns *alloc_ns(const char *prefix, const char *name)
|
||||
goto fail_ns;
|
||||
|
||||
INIT_LIST_HEAD(&ns->sub_ns);
|
||||
INIT_LIST_HEAD(&ns->rawdata_list);
|
||||
mutex_init(&ns->lock);
|
||||
|
||||
/* released by aa_free_ns() */
|
||||
|
||||
@ -122,16 +122,73 @@ static int audit_iface(struct aa_profile *new, const char *ns_name,
|
||||
return aa_audit(AUDIT_APPARMOR_STATUS, profile, &sa, audit_cb);
|
||||
}
|
||||
|
||||
void __aa_loaddata_update(struct aa_loaddata *data, long revision)
|
||||
{
|
||||
AA_BUG(!data);
|
||||
AA_BUG(!data->ns);
|
||||
AA_BUG(!data->dents[AAFS_LOADDATA_REVISION]);
|
||||
AA_BUG(!mutex_is_locked(&data->ns->lock));
|
||||
AA_BUG(data->revision > revision);
|
||||
|
||||
data->revision = revision;
|
||||
d_inode(data->dents[AAFS_LOADDATA_DIR])->i_mtime =
|
||||
current_time(d_inode(data->dents[AAFS_LOADDATA_DIR]));
|
||||
d_inode(data->dents[AAFS_LOADDATA_REVISION])->i_mtime =
|
||||
current_time(d_inode(data->dents[AAFS_LOADDATA_REVISION]));
|
||||
}
|
||||
|
||||
bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r)
|
||||
{
|
||||
if (l->size != r->size)
|
||||
return false;
|
||||
if (aa_g_hash_policy && memcmp(l->hash, r->hash, aa_hash_size()) != 0)
|
||||
return false;
|
||||
return memcmp(l->data, r->data, r->size) == 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* need to take the ns mutex lock which is NOT safe most places that
|
||||
* put_loaddata is called, so we have to delay freeing it
|
||||
*/
|
||||
static void do_loaddata_free(struct work_struct *work)
|
||||
{
|
||||
struct aa_loaddata *d = container_of(work, struct aa_loaddata, work);
|
||||
struct aa_ns *ns = aa_get_ns(d->ns);
|
||||
|
||||
if (ns) {
|
||||
mutex_lock(&ns->lock);
|
||||
__aa_fs_remove_rawdata(d);
|
||||
mutex_unlock(&ns->lock);
|
||||
aa_put_ns(ns);
|
||||
}
|
||||
|
||||
kzfree(d->hash);
|
||||
kfree(d->name);
|
||||
kvfree(d);
|
||||
}
|
||||
|
||||
void aa_loaddata_kref(struct kref *kref)
|
||||
{
|
||||
struct aa_loaddata *d = container_of(kref, struct aa_loaddata, count);
|
||||
|
||||
if (d) {
|
||||
kzfree(d->hash);
|
||||
kvfree(d);
|
||||
INIT_WORK(&d->work, do_loaddata_free);
|
||||
schedule_work(&d->work);
|
||||
}
|
||||
}
|
||||
|
||||
struct aa_loaddata *aa_loaddata_alloc(size_t size)
|
||||
{
|
||||
struct aa_loaddata *d = kvzalloc(sizeof(*d) + size, GFP_KERNEL);
|
||||
|
||||
if (d == NULL)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
kref_init(&d->count);
|
||||
INIT_LIST_HEAD(&d->list);
|
||||
|
||||
return d;
|
||||
}
|
||||
|
||||
/* test if read will be in packed data bounds */
|
||||
static bool inbounds(struct aa_ext *e, size_t size)
|
||||
{
|
||||
|
||||
Loading…
Reference in New Issue
Block a user