diff options
Diffstat (limited to 'security/selinux/selinuxfs.c')
| -rw-r--r-- | security/selinux/selinuxfs.c | 438 |
1 files changed, 261 insertions, 177 deletions
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index 0dbd5fd6a396..41099cc3d5e2 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -19,6 +19,7 @@ #include <linux/slab.h> #include <linux/vmalloc.h> #include <linux/fs.h> +#include <linux/mount.h> #include <linux/mutex.h> #include <linux/init.h> #include <linux/string.h> @@ -41,23 +42,6 @@ #include "objsec.h" #include "conditional.h" -static DEFINE_MUTEX(sel_mutex); - -/* global data for booleans */ -static struct dentry *bool_dir; -static int bool_num; -static char **bool_pending_names; -static int *bool_pending_values; - -/* global data for classes */ -static struct dentry *class_dir; -static unsigned long last_class_ino; - -static char policy_opened; - -/* global data for policy capabilities */ -static struct dentry *policycap_dir; - enum sel_inos { SEL_ROOT_INO = 2, SEL_LOAD, /* load policy */ @@ -82,7 +66,51 @@ enum sel_inos { SEL_INO_NEXT, /* The next inode number to use */ }; -static unsigned long sel_last_ino = SEL_INO_NEXT - 1; +struct selinux_fs_info { + struct dentry *bool_dir; + unsigned int bool_num; + char **bool_pending_names; + unsigned int *bool_pending_values; + struct dentry *class_dir; + unsigned long last_class_ino; + bool policy_opened; + struct dentry *policycap_dir; + struct mutex mutex; + unsigned long last_ino; + struct selinux_state *state; + struct super_block *sb; +}; + +static int selinux_fs_info_create(struct super_block *sb) +{ + struct selinux_fs_info *fsi; + + fsi = kzalloc(sizeof(*fsi), GFP_KERNEL); + if (!fsi) + return -ENOMEM; + + mutex_init(&fsi->mutex); + fsi->last_ino = SEL_INO_NEXT - 1; + fsi->state = &selinux_state; + fsi->sb = sb; + sb->s_fs_info = fsi; + return 0; +} + +static void selinux_fs_info_free(struct super_block *sb) +{ + struct selinux_fs_info *fsi = sb->s_fs_info; + int i; + + if (fsi) { + for (i = 0; i < fsi->bool_num; i++) + kfree(fsi->bool_pending_names[i]); + kfree(fsi->bool_pending_names); + kfree(fsi->bool_pending_values); + } + kfree(sb->s_fs_info); + sb->s_fs_info = NULL; +} #define SEL_INITCON_INO_OFFSET 0x01000000 #define SEL_BOOL_INO_OFFSET 0x02000000 @@ -94,11 +122,12 @@ static unsigned long sel_last_ino = SEL_INO_NEXT - 1; static ssize_t sel_read_enforce(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { + struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; char tmpbuf[TMPBUFLEN]; ssize_t length; length = scnprintf(tmpbuf, TMPBUFLEN, "%d", - enforcing_enabled(&selinux_state)); + enforcing_enabled(fsi->state)); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } @@ -107,6 +136,8 @@ static ssize_t sel_write_enforce(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { + struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; + struct selinux_state *state = fsi->state; char *page = NULL; ssize_t length; int old_value, new_value; @@ -128,8 +159,7 @@ static ssize_t sel_write_enforce(struct file *file, const char __user *buf, new_value = !!new_value; - old_value = enforcing_enabled(&selinux_state); - + old_value = enforcing_enabled(state); if (new_value != old_value) { length = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__SETENFORCE, @@ -141,12 +171,11 @@ static ssize_t sel_write_enforce(struct file *file, const char __user *buf, new_value, old_value, from_kuid(&init_user_ns, audit_get_loginuid(current)), audit_get_sessionid(current)); - enforcing_set(&selinux_state, new_value); + enforcing_set(state, new_value); if (new_value) avc_ss_reset(0); selnl_notify_setenforce(new_value); - selinux_status_update_setenforce(&selinux_state, - new_value); + selinux_status_update_setenforce(state, new_value); if (!new_value) call_lsm_notifier(LSM_POLICY_CHANGE, NULL); } @@ -168,12 +197,14 @@ static const struct file_operations sel_enforce_ops = { static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { + struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; + struct selinux_state *state = fsi->state; char tmpbuf[TMPBUFLEN]; ssize_t length; ino_t ino = file_inode(filp)->i_ino; int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? - security_get_reject_unknown(&selinux_state) : - !security_get_allow_unknown(&selinux_state); + security_get_reject_unknown(state) : + !security_get_allow_unknown(state); length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); @@ -186,7 +217,8 @@ static const struct file_operations sel_handle_unknown_ops = { static int sel_open_handle_status(struct inode *inode, struct file *filp) { - struct page *status = selinux_kernel_status_page(&selinux_state); + struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; + struct page *status = selinux_kernel_status_page(fsi->state); if (!status) return -ENOMEM; @@ -242,6 +274,7 @@ static ssize_t sel_write_disable(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { + struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; char *page; ssize_t length; int new_value; @@ -262,7 +295,7 @@ static ssize_t sel_write_disable(struct file *file, const char __user *buf, goto out; if (new_value) { - length = selinux_disable(&selinux_state); + length = selinux_disable(fsi->state); if (length) goto out; audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, @@ -301,9 +334,9 @@ static const struct file_operations sel_policyvers_ops = { }; /* declaration for sel_write_load */ -static int sel_make_bools(void); -static int sel_make_classes(void); -static int sel_make_policycap(void); +static int sel_make_bools(struct selinux_fs_info *fsi); +static int sel_make_classes(struct selinux_fs_info *fsi); +static int sel_make_policycap(struct selinux_fs_info *fsi); /* declaration for sel_make_class_dirs */ static struct dentry *sel_make_dir(struct dentry *dir, const char *name, @@ -312,11 +345,12 @@ static struct dentry *sel_make_dir(struct dentry *dir, const char *name, static ssize_t sel_read_mls(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { + struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; char tmpbuf[TMPBUFLEN]; ssize_t length; length = scnprintf(tmpbuf, TMPBUFLEN, "%d", - security_mls_enabled(&selinux_state)); + security_mls_enabled(fsi->state)); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } @@ -332,12 +366,14 @@ struct policy_load_memory { static int sel_open_policy(struct inode *inode, struct file *filp) { + struct selinux_fs_info *fsi = inode->i_sb->s_fs_info; + struct selinux_state *state = fsi->state; struct policy_load_memory *plm = NULL; int rc; BUG_ON(filp->private_data); - mutex_lock(&sel_mutex); + mutex_lock(&fsi->mutex); rc = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); @@ -345,7 +381,7 @@ static int sel_open_policy(struct inode *inode, struct file *filp) goto err; rc = -EBUSY; - if (policy_opened) + if (fsi->policy_opened) goto err; rc = -ENOMEM; @@ -353,25 +389,25 @@ static int sel_open_policy(struct inode *inode, struct file *filp) if (!plm) goto err; - if (i_size_read(inode) != security_policydb_len(&selinux_state)) { + if (i_size_read(inode) != security_policydb_len(state)) { inode_lock(inode); - i_size_write(inode, security_policydb_len(&selinux_state)); + i_size_write(inode, security_policydb_len(state)); inode_unlock(inode); } - rc = security_read_policy(&selinux_state, &plm->data, &plm->len); + rc = security_read_policy(state, &plm->data, &plm->len); if (rc) goto err; - policy_opened = 1; + fsi->policy_opened = 1; filp->private_data = plm; - mutex_unlock(&sel_mutex); + mutex_unlock(&fsi->mutex); return 0; err: - mutex_unlock(&sel_mutex); + mutex_unlock(&fsi->mutex); if (plm) vfree(plm->data); @@ -381,11 +417,12 @@ err: static int sel_release_policy(struct inode *inode, struct file *filp) { + struct selinux_fs_info *fsi = inode->i_sb->s_fs_info; struct policy_load_memory *plm = filp->private_data; BUG_ON(!plm); - policy_opened = 0; + fsi->policy_opened = 0; vfree(plm->data); kfree(plm); @@ -396,10 +433,11 @@ static int sel_release_policy(struct inode *inode, struct file *filp) static ssize_t sel_read_policy(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { + struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; struct policy_load_memory *plm = filp->private_data; int ret; - mutex_lock(&sel_mutex); + mutex_lock(&fsi->mutex); ret = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); @@ -408,7 +446,7 @@ static ssize_t sel_read_policy(struct file *filp, char __user *buf, ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); out: - mutex_unlock(&sel_mutex); + mutex_unlock(&fsi->mutex); return ret; } @@ -462,14 +500,40 @@ static const struct file_operations sel_policy_ops = { .llseek = generic_file_llseek, }; +static int sel_make_policy_nodes(struct selinux_fs_info *fsi) +{ + int ret; + + ret = sel_make_bools(fsi); + if (ret) { + pr_err("SELinux: failed to load policy booleans\n"); + return ret; + } + + ret = sel_make_classes(fsi); + if (ret) { + pr_err("SELinux: failed to load policy classes\n"); + return ret; + } + + ret = sel_make_policycap(fsi); + if (ret) { + pr_err("SELinux: failed to load policy capabilities\n"); + return ret; + } + + return 0; +} + static ssize_t sel_write_load(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { + struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; ssize_t length; void *data = NULL; - mutex_lock(&sel_mutex); + mutex_lock(&fsi->mutex); length = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL); @@ -494,29 +558,15 @@ static ssize_t sel_write_load(struct file *file, const char __user *buf, if (copy_from_user(data, buf, count) != 0) goto out; - length = security_load_policy(&selinux_state, data, count); + length = security_load_policy(fsi->state, data, count); if (length) { pr_warn_ratelimited("SELinux: failed to load policy\n"); goto out; } - length = sel_make_bools(); - if (length) { - pr_err("SELinux: failed to load policy booleans\n"); - goto out1; - } - - length = sel_make_classes(); - if (length) { - pr_err("SELinux: failed to load policy classes\n"); - goto out1; - } - - length = sel_make_policycap(); - if (length) { - pr_err("SELinux: failed to load policy capabilities\n"); + length = sel_make_policy_nodes(fsi); + if (length) goto out1; - } length = count; @@ -526,7 +576,7 @@ out1: from_kuid(&init_user_ns, audit_get_loginuid(current)), audit_get_sessionid(current)); out: - mutex_unlock(&sel_mutex); + mutex_unlock(&fsi->mutex); vfree(data); return length; } @@ -538,6 +588,8 @@ static const struct file_operations sel_load_ops = { static ssize_t sel_write_context(struct file *file, char *buf, size_t size) { + struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; + struct selinux_state *state = fsi->state; char *canon = NULL; u32 sid, len; ssize_t length; @@ -547,12 +599,11 @@ static ssize_t sel_write_context(struct file *file, char *buf, size_t size) if (length) goto out; - length = security_context_to_sid(&selinux_state, buf, size, - &sid, GFP_KERNEL); + length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL); if (length) goto out; - length = security_sid_to_context(&selinux_state, sid, &canon, &len); + length = security_sid_to_context(state, sid, &canon, &len); if (length) goto out; @@ -573,16 +624,18 @@ out: static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { + struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; char tmpbuf[TMPBUFLEN]; ssize_t length; - length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_state.checkreqprot); + length = scnprintf(tmpbuf, TMPBUFLEN, "%u", fsi->state->checkreqprot); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { + struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; char *page; ssize_t length; unsigned int new_value; @@ -608,7 +661,7 @@ static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, if (sscanf(page, "%u", &new_value) != 1) goto out; - selinux_state.checkreqprot = new_value ? 1 : 0; + fsi->state->checkreqprot = new_value ? 1 : 0; length = count; out: kfree(page); @@ -624,6 +677,8 @@ static ssize_t sel_write_validatetrans(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { + struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; + struct selinux_state *state = fsi->state; char *oldcon = NULL, *newcon = NULL, *taskcon = NULL; char *req = NULL; u32 osid, nsid, tsid; @@ -668,23 +723,19 @@ static ssize_t sel_write_validatetrans(struct file *file, if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4) goto out; - rc = security_context_str_to_sid(&selinux_state, oldcon, &osid, - GFP_KERNEL); + rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL); if (rc) goto out; - rc = security_context_str_to_sid(&selinux_state, newcon, &nsid, - GFP_KERNEL); + rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL); if (rc) goto out; - rc = security_context_str_to_sid(&selinux_state, taskcon, &tsid, - GFP_KERNEL); + rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL); if (rc) goto out; - rc = security_validate_transition_user(&selinux_state, osid, nsid, - tsid, tclass); + rc = security_validate_transition_user(state, osid, nsid, tsid, tclass); if (!rc) rc = count; out: @@ -754,6 +805,8 @@ static const struct file_operations transaction_ops = { static ssize_t sel_write_access(struct file *file, char *buf, size_t size) { + struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; + struct selinux_state *state = fsi->state; char *scon = NULL, *tcon = NULL; u32 ssid, tsid; u16 tclass; @@ -779,17 +832,15 @@ static ssize_t sel_write_access(struct file *file, char *buf, size_t size) if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) goto out; - length = security_context_str_to_sid(&selinux_state, scon, &ssid, - GFP_KERNEL); + length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); if (length) goto out; - length = security_context_str_to_sid(&selinux_state, tcon, &tsid, - GFP_KERNEL); + length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); if (length) goto out; - security_compute_av_user(&selinux_state, ssid, tsid, tclass, &avd); + security_compute_av_user(state, ssid, tsid, tclass, &avd); length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%x %x %x %x %u %x", @@ -804,6 +855,8 @@ out: static ssize_t sel_write_create(struct file *file, char *buf, size_t size) { + struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; + struct selinux_state *state = fsi->state; char *scon = NULL, *tcon = NULL; char *namebuf = NULL, *objname = NULL; u32 ssid, tsid, newsid; @@ -869,23 +922,20 @@ static ssize_t sel_write_create(struct file *file, char *buf, size_t size) objname = namebuf; } - length = security_context_str_to_sid(&selinux_state, scon, &ssid, - GFP_KERNEL); + length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); if (length) goto out; - length = security_context_str_to_sid(&selinux_state, tcon, &tsid, - GFP_KERNEL); + length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); if (length) goto out; - length = security_transition_sid_user(&selinux_state, ssid, tsid, - tclass, objname, &newsid); + length = security_transition_sid_user(state, ssid, tsid, tclass, + objname, &newsid); if (length) goto out; - length = security_sid_to_context(&selinux_state, newsid, &newcon, - &len); + length = security_sid_to_context(state, newsid, &newcon, &len); if (length) goto out; @@ -908,6 +958,8 @@ out: static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) { + struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; + struct selinux_state *state = fsi->state; char *scon = NULL, *tcon = NULL; u32 ssid, tsid, newsid; u16 tclass; @@ -935,23 +987,19 @@ static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) goto out; - length = security_context_str_to_sid(&selinux_state, scon, &ssid, - GFP_KERNEL); + length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); if (length) goto out; - length = security_context_str_to_sid(&selinux_state, tcon, &tsid, - GFP_KERNEL); + length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); if (length) goto out; - length = security_change_sid(&selinux_state, ssid, tsid, tclass, - &newsid); + length = security_change_sid(state, ssid, tsid, tclass, &newsid); if (length) goto out; - length = security_sid_to_context(&selinux_state, newsid, &newcon, - &len); + length = security_sid_to_context(state, newsid, &newcon, &len); if (length) goto out; @@ -970,6 +1018,8 @@ out: static ssize_t sel_write_user(struct file *file, char *buf, size_t size) { + struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; + struct selinux_state *state = fsi->state; char *con = NULL, *user = NULL, *ptr; u32 sid, *sids = NULL; ssize_t length; @@ -997,21 +1047,18 @@ static ssize_t sel_write_user(struct file *file, char *buf, size_t size) if (sscanf(buf, "%s %s", con, user) != 2) goto out; - length = security_context_str_to_sid(&selinux_state, con, &sid, - GFP_KERNEL); + length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL); if (length) goto out; - length = security_get_user_sids(&selinux_state, sid, user, &sids, - &nsids); + length = security_get_user_sids(state, sid, user, &sids, &nsids); if (length) goto out; length = sprintf(buf, "%u", nsids) + 1; ptr = buf + length; for (i = 0; i < nsids; i++) { - rc = security_sid_to_context(&selinux_state, sids[i], - &newcon, &len); + rc = security_sid_to_context(state, sids[i], &newcon, &len); if (rc) { length = rc; goto out; @@ -1035,6 +1082,8 @@ out: static ssize_t sel_write_member(struct file *file, char *buf, size_t size) { + struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; + struct selinux_state *state = fsi->state; char *scon = NULL, *tcon = NULL; u32 ssid, tsid, newsid; u16 tclass; @@ -1062,23 +1111,19 @@ static ssize_t sel_write_member(struct file *file, char *buf, size_t size) if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) goto out; - length = security_context_str_to_sid(&selinux_state, scon, &ssid, - GFP_KERNEL); + length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); if (length) goto out; - length = security_context_str_to_sid(&selinux_state, tcon, &tsid, - GFP_KERNEL); + length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); if (length) goto out; - length = security_member_sid(&selinux_state, ssid, tsid, tclass, - &newsid); + length = security_member_sid(state, ssid, tsid, tclass, &newsid); if (length) goto out; - length = security_sid_to_context(&selinux_state, newsid, &newcon, - &len); + length = security_sid_to_context(state, newsid, &newcon, &len); if (length) goto out; @@ -1112,6 +1157,7 @@ static struct inode *sel_make_inode(struct super_block *sb, int mode) static ssize_t sel_read_bool(struct file *filep, char __user *buf, size_t count, loff_t *ppos) { + struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; char *page = NULL; ssize_t length; ssize_t ret; @@ -1119,10 +1165,11 @@ static ssize_t sel_read_bool(struct file *filep, char __user *buf, unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; const char *name = filep->f_path.dentry->d_name.name; - mutex_lock(&sel_mutex); + mutex_lock(&fsi->mutex); ret = -EINVAL; - if (index >= bool_num || strcmp(name, bool_pending_names[index])) + if (index >= fsi->bool_num || strcmp(name, + fsi->bool_pending_names[index])) goto out; ret = -ENOMEM; @@ -1130,16 +1177,16 @@ static ssize_t sel_read_bool(struct file *filep, char __user *buf, if (!page) goto out; - cur_enforcing = security_get_bool_value(&selinux_state, index); + cur_enforcing = security_get_bool_value(fsi->state, index); if (cur_enforcing < 0) { ret = cur_enforcing; goto out; } length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, - bool_pending_values[index]); + fsi->bool_pending_values[index]); ret = simple_read_from_buffer(buf, count, ppos, page, length); out: - mutex_unlock(&sel_mutex); + mutex_unlock(&fsi->mutex); free_page((unsigned long)page); return ret; } @@ -1147,13 +1194,14 @@ out: static ssize_t sel_write_bool(struct file *filep, const char __user *buf, size_t count, loff_t *ppos) { + struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; char *page = NULL; ssize_t length; int new_value; unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; const char *name = filep->f_path.dentry->d_name.name; - mutex_lock(&sel_mutex); + mutex_lock(&fsi->mutex); length = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__SETBOOL, @@ -1162,7 +1210,8 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf, goto out; length = -EINVAL; - if (index >= bool_num || strcmp(name, bool_pending_names[index])) + if (index >= fsi->bool_num || strcmp(name, + fsi->bool_pending_names[index])) goto out; length = -ENOMEM; @@ -1188,11 +1237,11 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf, if (new_value) new_value = 1; - bool_pending_values[index] = new_value; + fsi->bool_pending_values[index] = new_value; length = count; out: - mutex_unlock(&sel_mutex); + mutex_unlock(&fsi->mutex); kfree(page); return length; } @@ -1207,11 +1256,12 @@ static ssize_t sel_commit_bools_write(struct file *filep, const char __user *buf, size_t count, loff_t *ppos) { + struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; char *page = NULL; ssize_t length; int new_value; - mutex_lock(&sel_mutex); + mutex_lock(&fsi->mutex); length = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__SETBOOL, @@ -1240,15 +1290,15 @@ static ssize_t sel_commit_bools_write(struct file *filep, goto out; length = 0; - if (new_value && bool_pending_values) - length = security_set_bools(&selinux_state, bool_num, - bool_pending_values); + if (new_value && fsi->bool_pending_values) + length = security_set_bools(fsi->state, fsi->bool_num, + fsi->bool_pending_values); if (!length) length = count; out: - mutex_unlock(&sel_mutex); + mutex_unlock(&fsi->mutex); kfree(page); return length; } @@ -1266,12 +1316,12 @@ static void sel_remove_entries(struct dentry *de) #define BOOL_DIR_NAME "booleans" -static int sel_make_bools(void) +static int sel_make_bools(struct selinux_fs_info *fsi) { int i, ret; ssize_t len; struct dentry *dentry = NULL; - struct dentry *dir = bool_dir; + struct dentry *dir = fsi->bool_dir; struct inode *inode = NULL; struct inode_security_struct *isec; char **names = NULL, *page; @@ -1280,13 +1330,13 @@ static int sel_make_bools(void) u32 sid; /* remove any existing files */ - for (i = 0; i < bool_num; i++) - kfree(bool_pending_names[i]); - kfree(bool_pending_names); - kfree(bool_pending_values); - bool_num = 0; - bool_pending_names = NULL; - bool_pending_values = NULL; + for (i = 0; i < fsi->bool_num; i++) + kfree(fsi->bool_pending_names[i]); + kfree(fsi->bool_pending_names); + kfree(fsi->bool_pending_values); + fsi->bool_num = 0; + fsi->bool_pending_names = NULL; + fsi->bool_pending_values = NULL; sel_remove_entries(dir); @@ -1295,7 +1345,7 @@ static int sel_make_bools(void) if (!page) goto out; - ret = security_get_bools(&selinux_state, &num, &names, &values); + ret = security_get_bools(fsi->state, &num, &names, &values); if (ret) goto out; @@ -1316,7 +1366,7 @@ static int sel_make_bools(void) goto out; isec = (struct inode_security_struct *)inode->i_security; - ret = security_genfs_sid(&selinux_state, "selinuxfs", page, + ret = security_genfs_sid(fsi->state, "selinuxfs", page, SECCLASS_FILE, &sid); if (ret) { pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n", @@ -1330,9 +1380,9 @@ static int sel_make_bools(void) inode->i_ino = i|SEL_BOOL_INO_OFFSET; d_add(dentry, inode); } - bool_num = num; - bool_pending_names = names; - bool_pending_values = values; + fsi->bool_num = num; + fsi->bool_pending_names = names; + fsi->bool_pending_values = values; free_page((unsigned long)page); return 0; @@ -1350,10 +1400,6 @@ out: return ret; } -#define NULL_FILE_NAME "null" - -struct path selinux_null; - static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { @@ -1503,6 +1549,8 @@ static const struct file_operations sel_avc_cache_stats_ops = { static int sel_make_avc_files(struct dentry *dir) { + struct super_block *sb = dir->d_sb; + struct selinux_fs_info *fsi = sb->s_fs_info; int i; static const struct tree_descr files[] = { { "cache_threshold", @@ -1526,7 +1574,7 @@ static int sel_make_avc_files(struct dentry *dir) return -ENOMEM; inode->i_fop = files[i].ops; - inode->i_ino = ++sel_last_ino; + inode->i_ino = ++fsi->last_ino; d_add(dentry, inode); } @@ -1536,12 +1584,13 @@ static int sel_make_avc_files(struct dentry *dir) static ssize_t sel_read_initcon(struct file *file, char __user *buf, size_t count, loff_t *ppos) { + struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; char *con; u32 sid, len; ssize_t ret; sid = file_inode(file)->i_ino&SEL_INO_MASK; - ret = security_sid_to_context(&selinux_state, sid, &con, &len); + ret = security_sid_to_context(fsi->state, sid, &con, &len); if (ret) return ret; @@ -1629,13 +1678,13 @@ static const struct file_operations sel_perm_ops = { static ssize_t sel_read_policycap(struct file *file, char __user *buf, size_t count, loff_t *ppos) { + struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; int value; char tmpbuf[TMPBUFLEN]; ssize_t length; unsigned long i_ino = file_inode(file)->i_ino; - value = security_policycap_supported(&selinux_state, - i_ino & SEL_INO_MASK); + value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK); length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); @@ -1649,11 +1698,11 @@ static const struct file_operations sel_policycap_ops = { static int sel_make_perm_files(char *objclass, int classvalue, struct dentry *dir) { + struct selinux_fs_info *fsi = dir->d_sb->s_fs_info; int i, rc, nperms; char **perms; - rc = security_get_permissions(&selinux_state, objclass, &perms, - &nperms); + rc = security_get_permissions(fsi->state, objclass, &perms, &nperms); if (rc) return rc; @@ -1687,6 +1736,8 @@ out: static int sel_make_class_dir_entries(char *classname, int index, struct dentry *dir) { + struct super_block *sb = dir->d_sb; + struct selinux_fs_info *fsi = sb->s_fs_info; struct dentry *dentry = NULL; struct inode *inode = NULL; int rc; @@ -1703,7 +1754,7 @@ static int sel_make_class_dir_entries(char *classname, int index, inode->i_ino = sel_class_to_ino(index); d_add(dentry, inode); - dentry = sel_make_dir(dir, "perms", &last_class_ino); + dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino); if (IS_ERR(dentry)) return PTR_ERR(dentry); @@ -1712,26 +1763,27 @@ static int sel_make_class_dir_entries(char *classname, int index, return rc; } -static int sel_make_classes(void) +static int sel_make_classes(struct selinux_fs_info *fsi) { + int rc, nclasses, i; char **classes; /* delete any existing entries */ - sel_remove_entries(class_dir); + sel_remove_entries(fsi->class_dir); - rc = security_get_classes(&selinux_state, &classes, &nclasses); + rc = security_get_classes(fsi->state, &classes, &nclasses); if (rc) return rc; /* +2 since classes are 1-indexed */ - last_class_ino = sel_class_to_ino(nclasses + 2); + fsi->last_class_ino = sel_class_to_ino(nclasses + 2); for (i = 0; i < nclasses; i++) { struct dentry *class_name_dir; - class_name_dir = sel_make_dir(class_dir, classes[i], - &last_class_ino); + class_name_dir = sel_make_dir(fsi->class_dir, classes[i], + &fsi->last_class_ino); if (IS_ERR(class_name_dir)) { rc = PTR_ERR(class_name_dir); goto out; @@ -1751,25 +1803,25 @@ out: return rc; } -static int sel_make_policycap(void) +static int sel_make_policycap(struct selinux_fs_info *fsi) { unsigned int iter; struct dentry *dentry = NULL; struct inode *inode = NULL; - sel_remove_entries(policycap_dir); + sel_remove_entries(fsi->policycap_dir); for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { if (iter < ARRAY_SIZE(selinux_policycap_names)) - dentry = d_alloc_name(policycap_dir, + dentry = d_alloc_name(fsi->policycap_dir, selinux_policycap_names[iter]); else - dentry = d_alloc_name(policycap_dir, "unknown"); + dentry = d_alloc_name(fsi->policycap_dir, "unknown"); if (dentry == NULL) return -ENOMEM; - inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); + inode = sel_make_inode(fsi->sb, S_IFREG | 0444); if (inode == NULL) return -ENOMEM; @@ -1808,8 +1860,11 @@ static struct dentry *sel_make_dir(struct dentry *dir, const char *name, return dentry; } +#define NULL_FILE_NAME "null" + static int sel_fill_super(struct super_block *sb, void *data, int silent) { + struct selinux_fs_info *fsi; int ret; struct dentry *dentry; struct inode *inode; @@ -1837,14 +1892,20 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent) S_IWUGO}, /* last one */ {""} }; + + ret = selinux_fs_info_create(sb); + if (ret) + goto err; + ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); if (ret) goto err; - bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino); - if (IS_ERR(bool_dir)) { - ret = PTR_ERR(bool_dir); - bool_dir = NULL; + fsi = sb->s_fs_info; + fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino); + if (IS_ERR(fsi->bool_dir)) { + ret = PTR_ERR(fsi->bool_dir); + fsi->bool_dir = NULL; goto err; } @@ -1858,7 +1919,7 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent) if (!inode) goto err; - inode->i_ino = ++sel_last_ino; + inode->i_ino = ++fsi->last_ino; isec = (struct inode_security_struct *)inode->i_security; isec->sid = SECINITSID_DEVNULL; isec->sclass = SECCLASS_CHR_FILE; @@ -1866,9 +1927,8 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent) init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); d_add(dentry, inode); - selinux_null.dentry = dentry; - dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino); + dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino); if (IS_ERR(dentry)) { ret = PTR_ERR(dentry); goto err; @@ -1878,7 +1938,7 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent) if (ret) goto err; - dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino); + dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino); if (IS_ERR(dentry)) { ret = PTR_ERR(dentry); goto err; @@ -1888,23 +1948,31 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent) if (ret) goto err; - class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino); - if (IS_ERR(class_dir)) { - ret = PTR_ERR(class_dir); - class_dir = NULL; + fsi->class_dir = sel_make_dir(sb->s_root, "class", &fsi->last_ino); + if (IS_ERR(fsi->class_dir)) { + ret = PTR_ERR(fsi->class_dir); + fsi->class_dir = NULL; goto err; } - policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino); - if (IS_ERR(policycap_dir)) { - ret = PTR_ERR(policycap_dir); - policycap_dir = NULL; + fsi->policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", + &fsi->last_ino); + if (IS_ERR(fsi->policycap_dir)) { + ret = PTR_ERR(fsi->policycap_dir); + fsi->policycap_dir = NULL; goto err; } + + ret = sel_make_policy_nodes(fsi); + if (ret) + goto err; return 0; err: printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", __func__); + + selinux_fs_info_free(sb); + return ret; } @@ -1914,16 +1982,25 @@ static struct dentry *sel_mount(struct file_system_type *fs_type, return mount_single(fs_type, flags, data, sel_fill_super); } +static void sel_kill_sb(struct super_block *sb) +{ + selinux_fs_info_free(sb); + kill_litter_super(sb); +} + static struct file_system_type sel_fs_type = { .name = "selinuxfs", .mount = sel_mount, - .kill_sb = kill_litter_super, + .kill_sb = sel_kill_sb, }; struct vfsmount *selinuxfs_mount; +struct path selinux_null; static int __init init_sel_fs(void) { + struct qstr null_name = QSTR_INIT(NULL_FILE_NAME, + sizeof(NULL_FILE_NAME)-1); int err; if (!selinux_enabled) @@ -1945,6 +2022,13 @@ static int __init init_sel_fs(void) err = PTR_ERR(selinuxfs_mount); selinuxfs_mount = NULL; } + selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root, + &null_name); + if (IS_ERR(selinux_null.dentry)) { + pr_err("selinuxfs: could not lookup null!\n"); + err = PTR_ERR(selinux_null.dentry); + selinux_null.dentry = NULL; + } return err; } |