| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Andrew Morton | 3532 | 34.55% | 9 | 5.66% |
| Stephen D. Smalley | 1359 | 13.29% | 21 | 13.21% |
| Eric Paris | 773 | 7.56% | 12 | 7.55% |
| James Morris | 751 | 7.35% | 12 | 7.55% |
| Christopher J. PeBenito | 645 | 6.31% | 2 | 1.26% |
| Al Viro | 579 | 5.66% | 9 | 5.66% |
| Daniel Burgener | 360 | 3.52% | 4 | 2.52% |
| Andrew Perepechko | 267 | 2.61% | 1 | 0.63% |
| Paul Moore | 253 | 2.47% | 8 | 5.03% |
| KaiGai Kohei | 247 | 2.42% | 3 | 1.89% |
| Jeff Vander Stoep | 246 | 2.41% | 1 | 0.63% |
| James Carter | 226 | 2.21% | 3 | 1.89% |
| Kohei Kaigai | 158 | 1.55% | 2 | 1.26% |
| Chris Wright | 135 | 1.32% | 1 | 0.63% |
| Arnd Bergmann | 90 | 0.88% | 1 | 0.63% |
| nixiaoming | 56 | 0.55% | 1 | 0.63% |
| Ondrej Mosnáček | 52 | 0.51% | 7 | 4.40% |
| Christian Göttsche | 52 | 0.51% | 8 | 5.03% |
| David Howells | 51 | 0.50% | 2 | 1.26% |
| Jann Horn | 44 | 0.43% | 1 | 0.63% |
| Eric Biggers | 41 | 0.40% | 2 | 1.26% |
| Steve Grubb | 36 | 0.35% | 1 | 0.63% |
| Linus Torvalds | 26 | 0.25% | 1 | 0.63% |
| Eric W. Biedermann | 23 | 0.22% | 2 | 1.26% |
| Gary Tierney | 23 | 0.22% | 2 | 1.26% |
| Nikolay Aleksandrov | 20 | 0.20% | 1 | 0.63% |
| Arjan van de Ven | 19 | 0.19% | 1 | 0.63% |
| Greg Kroah-Hartman | 18 | 0.18% | 1 | 0.63% |
| Suren Baghdasaryan | 12 | 0.12% | 1 | 0.63% |
| Andy Shevchenko | 10 | 0.10% | 1 | 0.63% |
| Daniel Jurgens | 10 | 0.10% | 1 | 0.63% |
| Yuichi Nakamura | 9 | 0.09% | 1 | 0.63% |
| Rasmus Villemoes | 9 | 0.09% | 1 | 0.63% |
| Ingo Molnar | 9 | 0.09% | 1 | 0.63% |
| Lakshmi Ramasubramanian | 8 | 0.08% | 3 | 1.89% |
| Casey Schaufler | 6 | 0.06% | 1 | 0.63% |
| Vasily Averin | 6 | 0.06% | 1 | 0.63% |
| pender01 | 5 | 0.05% | 1 | 0.63% |
| Dave Hansen | 5 | 0.05% | 1 | 0.63% |
| SF Markus Elfring | 5 | 0.05% | 2 | 1.26% |
| Richard Guy Briggs | 5 | 0.05% | 3 | 1.89% |
| Harvey Harrison | 4 | 0.04% | 1 | 0.63% |
| Darrel Goeddel | 4 | 0.04% | 1 | 0.63% |
| Venkat Yekkirala | 4 | 0.04% | 1 | 0.63% |
| Deepa Dinamani | 3 | 0.03% | 1 | 0.63% |
| Konstantin Khlebnikov | 3 | 0.03% | 1 | 0.63% |
| Joe Perches | 2 | 0.02% | 1 | 0.63% |
| Dave Jiang | 2 | 0.02% | 1 | 0.63% |
| Thomas Gleixner | 2 | 0.02% | 1 | 0.63% |
| Davi Arnaut | 2 | 0.02% | 1 | 0.63% |
| Nicolas Kaiser | 2 | 0.02% | 1 | 0.63% |
| liuyang34 | 2 | 0.02% | 1 | 0.63% |
| Andreas Gruenbacher | 2 | 0.02% | 1 | 0.63% |
| Jeff Layton | 1 | 0.01% | 1 | 0.63% |
| Heinrich Schuchardt | 1 | 0.01% | 1 | 0.63% |
| Janne Karhunen | 1 | 0.01% | 1 | 0.63% |
| Kirill A. Shutemov | 1 | 0.01% | 1 | 0.63% |
| Rusty Russell | 1 | 0.01% | 1 | 0.63% |
| Jan Engelhardt | 1 | 0.01% | 1 | 0.63% |
| Dan Carpenter | 1 | 0.01% | 1 | 0.63% |
| ye xingchen | 1 | 0.01% | 1 | 0.63% |
| Souptick Joarder | 1 | 0.01% | 1 | 0.63% |
| Guido Trentalancia | 1 | 0.01% | 1 | 0.63% |
| Total | 10223 | 159 |
// SPDX-License-Identifier: GPL-2.0-only /* Updated: Karl MacMillan <kmacmillan@tresys.com> * * Added conditional policy language extensions * * Updated: Hewlett-Packard <paul@paul-moore.com> * * Added support for the policy capability bitmap * * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. * Copyright (C) 2003 - 2004 Tresys Technology, LLC * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> */ #include <linux/kernel.h> #include <linux/pagemap.h> #include <linux/slab.h> #include <linux/vmalloc.h> #include <linux/fs.h> #include <linux/fs_context.h> #include <linux/mount.h> #include <linux/mutex.h> #include <linux/namei.h> #include <linux/init.h> #include <linux/string.h> #include <linux/security.h> #include <linux/major.h> #include <linux/seq_file.h> #include <linux/percpu.h> #include <linux/audit.h> #include <linux/uaccess.h> #include <linux/kobject.h> #include <linux/ctype.h> /* selinuxfs pseudo filesystem for exporting the security policy API. Based on the proc code and the fs/nfsd/nfsctl.c code. */ #include "flask.h" #include "avc.h" #include "avc_ss.h" #include "security.h" #include "objsec.h" #include "conditional.h" #include "ima.h" enum sel_inos { SEL_ROOT_INO = 2, SEL_LOAD, /* load policy */ SEL_ENFORCE, /* get or set enforcing status */ SEL_CONTEXT, /* validate context */ SEL_ACCESS, /* compute access decision */ SEL_CREATE, /* compute create labeling decision */ SEL_RELABEL, /* compute relabeling decision */ SEL_USER, /* compute reachable user contexts */ SEL_POLICYVERS, /* return policy version for this kernel */ SEL_COMMIT_BOOLS, /* commit new boolean values */ SEL_MLS, /* return if MLS policy is enabled */ SEL_DISABLE, /* disable SELinux until next reboot */ SEL_MEMBER, /* compute polyinstantiation membership decision */ SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ SEL_COMPAT_NET, /* whether to use old compat network packet controls */ SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ SEL_STATUS, /* export current status using mmap() */ SEL_POLICY, /* allow userspace to read the in kernel policy */ SEL_VALIDATE_TRANS, /* compute validatetrans decision */ SEL_INO_NEXT, /* The next inode number to use */ }; struct selinux_fs_info { struct dentry *bool_dir; unsigned int bool_num; char **bool_pending_names; int *bool_pending_values; struct dentry *class_dir; unsigned long last_class_ino; bool policy_opened; struct dentry *policycap_dir; unsigned long last_ino; 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; fsi->last_ino = SEL_INO_NEXT - 1; 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; unsigned 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 #define SEL_CLASS_INO_OFFSET 0x04000000 #define SEL_POLICYCAP_INO_OFFSET 0x08000000 #define SEL_INO_MASK 0x00ffffff #define BOOL_DIR_NAME "booleans" #define CLASS_DIR_NAME "class" #define POLICYCAP_DIR_NAME "policy_capabilities" #define TMPBUFLEN 12 static ssize_t sel_read_enforce(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { char tmpbuf[TMPBUFLEN]; ssize_t length; length = scnprintf(tmpbuf, TMPBUFLEN, "%d", enforcing_enabled()); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } #ifdef CONFIG_SECURITY_SELINUX_DEVELOP static ssize_t sel_write_enforce(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { char *page = NULL; ssize_t length; int scan_value; bool old_value, new_value; if (count >= PAGE_SIZE) return -ENOMEM; /* No partial writes. */ if (*ppos != 0) return -EINVAL; page = memdup_user_nul(buf, count); if (IS_ERR(page)) return PTR_ERR(page); length = -EINVAL; if (sscanf(page, "%d", &scan_value) != 1) goto out; new_value = !!scan_value; old_value = enforcing_enabled(); if (new_value != old_value) { length = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__SETENFORCE, NULL); if (length) goto out; audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS, "enforcing=%d old_enforcing=%d auid=%u ses=%u" " enabled=1 old-enabled=1 lsm=selinux res=1", new_value, old_value, from_kuid(&init_user_ns, audit_get_loginuid(current)), audit_get_sessionid(current)); enforcing_set(new_value); if (new_value) avc_ss_reset(0); selnl_notify_setenforce(new_value); selinux_status_update_setenforce(new_value); if (!new_value) call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL); selinux_ima_measure_state(); } length = count; out: kfree(page); return length; } #else #define sel_write_enforce NULL #endif static const struct file_operations sel_enforce_ops = { .read = sel_read_enforce, .write = sel_write_enforce, .llseek = generic_file_llseek, }; static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { 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() : !security_get_allow_unknown(); length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } static const struct file_operations sel_handle_unknown_ops = { .read = sel_read_handle_unknown, .llseek = generic_file_llseek, }; static int sel_open_handle_status(struct inode *inode, struct file *filp) { struct page *status = selinux_kernel_status_page(); if (!status) return -ENOMEM; filp->private_data = status; return 0; } static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { struct page *status = filp->private_data; BUG_ON(!status); return simple_read_from_buffer(buf, count, ppos, page_address(status), sizeof(struct selinux_kernel_status)); } static int sel_mmap_handle_status(struct file *filp, struct vm_area_struct *vma) { struct page *status = filp->private_data; unsigned long size = vma->vm_end - vma->vm_start; BUG_ON(!status); /* only allows one page from the head */ if (vma->vm_pgoff > 0 || size != PAGE_SIZE) return -EIO; /* disallow writable mapping */ if (vma->vm_flags & VM_WRITE) return -EPERM; /* disallow mprotect() turns it into writable */ vm_flags_clear(vma, VM_MAYWRITE); return remap_pfn_range(vma, vma->vm_start, page_to_pfn(status), size, vma->vm_page_prot); } static const struct file_operations sel_handle_status_ops = { .open = sel_open_handle_status, .read = sel_read_handle_status, .mmap = sel_mmap_handle_status, .llseek = generic_file_llseek, }; static ssize_t sel_write_disable(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { char *page; ssize_t length; int new_value; if (count >= PAGE_SIZE) return -ENOMEM; /* No partial writes. */ if (*ppos != 0) return -EINVAL; page = memdup_user_nul(buf, count); if (IS_ERR(page)) return PTR_ERR(page); if (sscanf(page, "%d", &new_value) != 1) { length = -EINVAL; goto out; } length = count; if (new_value) { pr_err("SELinux: https://github.com/SELinuxProject/selinux-kernel/wiki/DEPRECATE-runtime-disable\n"); pr_err("SELinux: Runtime disable is not supported, use selinux=0 on the kernel cmdline.\n"); } out: kfree(page); return length; } static const struct file_operations sel_disable_ops = { .write = sel_write_disable, .llseek = generic_file_llseek, }; static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { char tmpbuf[TMPBUFLEN]; ssize_t length; length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } static const struct file_operations sel_policyvers_ops = { .read = sel_read_policyvers, .llseek = generic_file_llseek, }; /* declaration for sel_write_load */ static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir, unsigned int *bool_num, char ***bool_pending_names, int **bool_pending_values); static int sel_make_classes(struct selinux_policy *newpolicy, struct dentry *class_dir, unsigned long *last_class_ino); /* declaration for sel_make_class_dirs */ static struct dentry *sel_make_dir(struct dentry *dir, const char *name, unsigned long *ino); /* declaration for sel_make_policy_nodes */ static struct dentry *sel_make_swapover_dir(struct super_block *sb, unsigned long *ino); static ssize_t sel_read_mls(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { char tmpbuf[TMPBUFLEN]; ssize_t length; length = scnprintf(tmpbuf, TMPBUFLEN, "%d", security_mls_enabled()); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } static const struct file_operations sel_mls_ops = { .read = sel_read_mls, .llseek = generic_file_llseek, }; struct policy_load_memory { size_t len; void *data; }; static int sel_open_policy(struct inode *inode, struct file *filp) { struct selinux_fs_info *fsi = inode->i_sb->s_fs_info; struct policy_load_memory *plm = NULL; int rc; BUG_ON(filp->private_data); mutex_lock(&selinux_state.policy_mutex); rc = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); if (rc) goto err; rc = -EBUSY; if (fsi->policy_opened) goto err; rc = -ENOMEM; plm = kzalloc(sizeof(*plm), GFP_KERNEL); if (!plm) goto err; rc = security_read_policy(&plm->data, &plm->len); if (rc) goto err; if ((size_t)i_size_read(inode) != plm->len) { inode_lock(inode); i_size_write(inode, plm->len); inode_unlock(inode); } fsi->policy_opened = 1; filp->private_data = plm; mutex_unlock(&selinux_state.policy_mutex); return 0; err: mutex_unlock(&selinux_state.policy_mutex); if (plm) vfree(plm->data); kfree(plm); return rc; } 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); fsi->policy_opened = 0; vfree(plm->data); kfree(plm); return 0; } static ssize_t sel_read_policy(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { struct policy_load_memory *plm = filp->private_data; int ret; ret = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); if (ret) return ret; return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); } static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf) { struct policy_load_memory *plm = vmf->vma->vm_file->private_data; unsigned long offset; struct page *page; if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) return VM_FAULT_SIGBUS; offset = vmf->pgoff << PAGE_SHIFT; if (offset >= roundup(plm->len, PAGE_SIZE)) return VM_FAULT_SIGBUS; page = vmalloc_to_page(plm->data + offset); get_page(page); vmf->page = page; return 0; } static const struct vm_operations_struct sel_mmap_policy_ops = { .fault = sel_mmap_policy_fault, .page_mkwrite = sel_mmap_policy_fault, }; static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) { if (vma->vm_flags & VM_SHARED) { /* do not allow mprotect to make mapping writable */ vm_flags_clear(vma, VM_MAYWRITE); if (vma->vm_flags & VM_WRITE) return -EACCES; } vm_flags_set(vma, VM_DONTEXPAND | VM_DONTDUMP); vma->vm_ops = &sel_mmap_policy_ops; return 0; } static const struct file_operations sel_policy_ops = { .open = sel_open_policy, .read = sel_read_policy, .mmap = sel_mmap_policy, .release = sel_release_policy, .llseek = generic_file_llseek, }; static void sel_remove_old_bool_data(unsigned int bool_num, char **bool_names, int *bool_values) { u32 i; /* bool_dir cleanup */ for (i = 0; i < bool_num; i++) kfree(bool_names[i]); kfree(bool_names); kfree(bool_values); } static int sel_make_policy_nodes(struct selinux_fs_info *fsi, struct selinux_policy *newpolicy) { int ret = 0; struct dentry *tmp_parent, *tmp_bool_dir, *tmp_class_dir; unsigned int bool_num = 0; char **bool_names = NULL; int *bool_values = NULL; unsigned long tmp_ino = fsi->last_ino; /* Don't increment last_ino in this function */ tmp_parent = sel_make_swapover_dir(fsi->sb, &tmp_ino); if (IS_ERR(tmp_parent)) return PTR_ERR(tmp_parent); tmp_ino = fsi->bool_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */ tmp_bool_dir = sel_make_dir(tmp_parent, BOOL_DIR_NAME, &tmp_ino); if (IS_ERR(tmp_bool_dir)) { ret = PTR_ERR(tmp_bool_dir); goto out; } tmp_ino = fsi->class_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */ tmp_class_dir = sel_make_dir(tmp_parent, CLASS_DIR_NAME, &tmp_ino); if (IS_ERR(tmp_class_dir)) { ret = PTR_ERR(tmp_class_dir); goto out; } ret = sel_make_bools(newpolicy, tmp_bool_dir, &bool_num, &bool_names, &bool_values); if (ret) goto out; ret = sel_make_classes(newpolicy, tmp_class_dir, &fsi->last_class_ino); if (ret) goto out; lock_rename(tmp_parent, fsi->sb->s_root); /* booleans */ d_exchange(tmp_bool_dir, fsi->bool_dir); swap(fsi->bool_num, bool_num); swap(fsi->bool_pending_names, bool_names); swap(fsi->bool_pending_values, bool_values); fsi->bool_dir = tmp_bool_dir; /* classes */ d_exchange(tmp_class_dir, fsi->class_dir); fsi->class_dir = tmp_class_dir; unlock_rename(tmp_parent, fsi->sb->s_root); out: sel_remove_old_bool_data(bool_num, bool_names, bool_values); /* Since the other temporary dirs are children of tmp_parent * this will handle all the cleanup in the case of a failure before * the swapover */ simple_recursive_removal(tmp_parent, NULL); return ret; } static ssize_t sel_write_load(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct selinux_fs_info *fsi; struct selinux_load_state load_state; ssize_t length; void *data = NULL; /* no partial writes */ if (*ppos) return -EINVAL; /* no empty policies */ if (!count) return -EINVAL; mutex_lock(&selinux_state.policy_mutex); length = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL); if (length) goto out; data = vmalloc(count); if (!data) { length = -ENOMEM; goto out; } if (copy_from_user(data, buf, count) != 0) { length = -EFAULT; goto out; } length = security_load_policy(data, count, &load_state); if (length) { pr_warn_ratelimited("SELinux: failed to load policy\n"); goto out; } fsi = file_inode(file)->i_sb->s_fs_info; length = sel_make_policy_nodes(fsi, load_state.policy); if (length) { pr_warn_ratelimited("SELinux: failed to initialize selinuxfs\n"); selinux_policy_cancel(&load_state); goto out; } selinux_policy_commit(&load_state); length = count; audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, "auid=%u ses=%u lsm=selinux res=1", from_kuid(&init_user_ns, audit_get_loginuid(current)), audit_get_sessionid(current)); out: mutex_unlock(&selinux_state.policy_mutex); vfree(data); return length; } static const struct file_operations sel_load_ops = { .write = sel_write_load, .llseek = generic_file_llseek, }; static ssize_t sel_write_context(struct file *file, char *buf, size_t size) { char *canon = NULL; u32 sid, len; ssize_t length; length = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL); if (length) goto out; length = security_context_to_sid(buf, size, &sid, GFP_KERNEL); if (length) goto out; length = security_sid_to_context(sid, &canon, &len); if (length) goto out; length = -ERANGE; if (len > SIMPLE_TRANSACTION_LIMIT) { pr_err("SELinux: %s: context size (%u) exceeds " "payload max\n", __func__, len); goto out; } memcpy(buf, canon, len); length = len; out: kfree(canon); return length; } static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { char tmpbuf[TMPBUFLEN]; ssize_t length; length = scnprintf(tmpbuf, TMPBUFLEN, "%u", checkreqprot_get()); 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) { char *page; ssize_t length; unsigned int new_value; length = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT, NULL); if (length) return length; if (count >= PAGE_SIZE) return -ENOMEM; /* No partial writes. */ if (*ppos != 0) return -EINVAL; page = memdup_user_nul(buf, count); if (IS_ERR(page)) return PTR_ERR(page); if (sscanf(page, "%u", &new_value) != 1) { length = -EINVAL; goto out; } length = count; if (new_value) { char comm[sizeof(current->comm)]; memcpy(comm, current->comm, sizeof(comm)); pr_err("SELinux: %s (%d) set checkreqprot to 1. This is no longer supported.\n", comm, current->pid); } selinux_ima_measure_state(); out: kfree(page); return length; } static const struct file_operations sel_checkreqprot_ops = { .read = sel_read_checkreqprot, .write = sel_write_checkreqprot, .llseek = generic_file_llseek, }; static ssize_t sel_write_validatetrans(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { char *oldcon = NULL, *newcon = NULL, *taskcon = NULL; char *req = NULL; u32 osid, nsid, tsid; u16 tclass; int rc; rc = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL); if (rc) goto out; rc = -ENOMEM; if (count >= PAGE_SIZE) goto out; /* No partial writes. */ rc = -EINVAL; if (*ppos != 0) goto out; req = memdup_user_nul(buf, count); if (IS_ERR(req)) { rc = PTR_ERR(req); req = NULL; goto out; } rc = -ENOMEM; oldcon = kzalloc(count + 1, GFP_KERNEL); if (!oldcon) goto out; newcon = kzalloc(count + 1, GFP_KERNEL); if (!newcon) goto out; taskcon = kzalloc(count + 1, GFP_KERNEL); if (!taskcon) goto out; rc = -EINVAL; if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4) goto out; rc = security_context_str_to_sid(oldcon, &osid, GFP_KERNEL); if (rc) goto out; rc = security_context_str_to_sid(newcon, &nsid, GFP_KERNEL); if (rc) goto out; rc = security_context_str_to_sid(taskcon, &tsid, GFP_KERNEL); if (rc) goto out; rc = security_validate_transition_user(osid, nsid, tsid, tclass); if (!rc) rc = count; out: kfree(req); kfree(oldcon); kfree(newcon); kfree(taskcon); return rc; } static const struct file_operations sel_transition_ops = { .write = sel_write_validatetrans, .llseek = generic_file_llseek, }; /* * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c */ static ssize_t sel_write_access(struct file *file, char *buf, size_t size); static ssize_t sel_write_create(struct file *file, char *buf, size_t size); static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); static ssize_t sel_write_user(struct file *file, char *buf, size_t size); static ssize_t sel_write_member(struct file *file, char *buf, size_t size); static ssize_t (*const write_op[])(struct file *, char *, size_t) = { [SEL_ACCESS] = sel_write_access, [SEL_CREATE] = sel_write_create, [SEL_RELABEL] = sel_write_relabel, [SEL_USER] = sel_write_user, [SEL_MEMBER] = sel_write_member, [SEL_CONTEXT] = sel_write_context, }; static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) { ino_t ino = file_inode(file)->i_ino; char *data; ssize_t rv; if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) return -EINVAL; data = simple_transaction_get(file, buf, size); if (IS_ERR(data)) return PTR_ERR(data); rv = write_op[ino](file, data, size); if (rv > 0) { simple_transaction_set(file, rv); rv = size; } return rv; } static const struct file_operations transaction_ops = { .write = selinux_transaction_write, .read = simple_transaction_read, .release = simple_transaction_release, .llseek = generic_file_llseek, }; /* * payload - write methods * If the method has a response, the response should be put in buf, * and the length returned. Otherwise return 0 or and -error. */ static ssize_t sel_write_access(struct file *file, char *buf, size_t size) { char *scon = NULL, *tcon = NULL; u32 ssid, tsid; u16 tclass; struct av_decision avd; ssize_t length; length = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL); if (length) goto out; length = -ENOMEM; scon = kzalloc(size + 1, GFP_KERNEL); if (!scon) goto out; length = -ENOMEM; tcon = kzalloc(size + 1, GFP_KERNEL); if (!tcon) goto out; length = -EINVAL; if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) goto out; length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); if (length) goto out; length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); if (length) goto out; security_compute_av_user(ssid, tsid, tclass, &avd); length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%x %x %x %x %u %x", avd.allowed, 0xffffffff, avd.auditallow, avd.auditdeny, avd.seqno, avd.flags); out: kfree(tcon); kfree(scon); return length; } static ssize_t sel_write_create(struct file *file, char *buf, size_t size) { char *scon = NULL, *tcon = NULL; char *namebuf = NULL, *objname = NULL; u32 ssid, tsid, newsid; u16 tclass; ssize_t length; char *newcon = NULL; u32 len; int nargs; length = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE, NULL); if (length) goto out; length = -ENOMEM; scon = kzalloc(size + 1, GFP_KERNEL); if (!scon) goto out; length = -ENOMEM; tcon = kzalloc(size + 1, GFP_KERNEL); if (!tcon) goto out; length = -ENOMEM; namebuf = kzalloc(size + 1, GFP_KERNEL); if (!namebuf) goto out; length = -EINVAL; nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); if (nargs < 3 || nargs > 4) goto out; if (nargs == 4) { /* * If and when the name of new object to be queried contains * either whitespace or multibyte characters, they shall be * encoded based on the percentage-encoding rule. * If not encoded, the sscanf logic picks up only left-half * of the supplied name; split by a whitespace unexpectedly. */ char *r, *w; int c1, c2; r = w = namebuf; do { c1 = *r++; if (c1 == '+') c1 = ' '; else if (c1 == '%') { c1 = hex_to_bin(*r++); if (c1 < 0) goto out; c2 = hex_to_bin(*r++); if (c2 < 0) goto out; c1 = (c1 << 4) | c2; } *w++ = c1; } while (c1 != '\0'); objname = namebuf; } length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); if (length) goto out; length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); if (length) goto out; length = security_transition_sid_user(ssid, tsid, tclass, objname, &newsid); if (length) goto out; length = security_sid_to_context(newsid, &newcon, &len); if (length) goto out; length = -ERANGE; if (len > SIMPLE_TRANSACTION_LIMIT) { pr_err("SELinux: %s: context size (%u) exceeds " "payload max\n", __func__, len); goto out; } memcpy(buf, newcon, len); length = len; out: kfree(newcon); kfree(namebuf); kfree(tcon); kfree(scon); return length; } static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) { char *scon = NULL, *tcon = NULL; u32 ssid, tsid, newsid; u16 tclass; ssize_t length; char *newcon = NULL; u32 len; length = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL, NULL); if (length) goto out; length = -ENOMEM; scon = kzalloc(size + 1, GFP_KERNEL); if (!scon) goto out; length = -ENOMEM; tcon = kzalloc(size + 1, GFP_KERNEL); if (!tcon) goto out; length = -EINVAL; if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) goto out; length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); if (length) goto out; length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); if (length) goto out; length = security_change_sid(ssid, tsid, tclass, &newsid); if (length) goto out; length = security_sid_to_context(newsid, &newcon, &len); if (length) goto out; length = -ERANGE; if (len > SIMPLE_TRANSACTION_LIMIT) goto out; memcpy(buf, newcon, len); length = len; out: kfree(newcon); kfree(tcon); kfree(scon); return length; } static ssize_t sel_write_user(struct file *file, char *buf, size_t size) { char *con = NULL, *user = NULL, *ptr; u32 sid, *sids = NULL; ssize_t length; char *newcon; int rc; u32 i, len, nsids; length = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__COMPUTE_USER, NULL); if (length) goto out; length = -ENOMEM; con = kzalloc(size + 1, GFP_KERNEL); if (!con) goto out; length = -ENOMEM; user = kzalloc(size + 1, GFP_KERNEL); if (!user) goto out; length = -EINVAL; if (sscanf(buf, "%s %s", con, user) != 2) goto out; length = security_context_str_to_sid(con, &sid, GFP_KERNEL); if (length) goto out; length = security_get_user_sids(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(sids[i], &newcon, &len); if (rc) { length = rc; goto out; } if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { kfree(newcon); length = -ERANGE; goto out; } memcpy(ptr, newcon, len); kfree(newcon); ptr += len; length += len; } out: kfree(sids); kfree(user); kfree(con); return length; } static ssize_t sel_write_member(struct file *file, char *buf, size_t size) { char *scon = NULL, *tcon = NULL; u32 ssid, tsid, newsid; u16 tclass; ssize_t length; char *newcon = NULL; u32 len; length = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER, NULL); if (length) goto out; length = -ENOMEM; scon = kzalloc(size + 1, GFP_KERNEL); if (!scon) goto out; length = -ENOMEM; tcon = kzalloc(size + 1, GFP_KERNEL); if (!tcon) goto out; length = -EINVAL; if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) goto out; length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); if (length) goto out; length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); if (length) goto out; length = security_member_sid(ssid, tsid, tclass, &newsid); if (length) goto out; length = security_sid_to_context(newsid, &newcon, &len); if (length) goto out; length = -ERANGE; if (len > SIMPLE_TRANSACTION_LIMIT) { pr_err("SELinux: %s: context size (%u) exceeds " "payload max\n", __func__, len); goto out; } memcpy(buf, newcon, len); length = len; out: kfree(newcon); kfree(tcon); kfree(scon); return length; } static struct inode *sel_make_inode(struct super_block *sb, umode_t mode) { struct inode *ret = new_inode(sb); if (ret) { ret->i_mode = mode; simple_inode_init_ts(ret); } return ret; } 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; int cur_enforcing; unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; const char *name = filep->f_path.dentry->d_name.name; mutex_lock(&selinux_state.policy_mutex); ret = -EINVAL; if (index >= fsi->bool_num || strcmp(name, fsi->bool_pending_names[index])) goto out_unlock; ret = -ENOMEM; page = (char *)get_zeroed_page(GFP_KERNEL); if (!page) goto out_unlock; cur_enforcing = security_get_bool_value(index); if (cur_enforcing < 0) { ret = cur_enforcing; goto out_unlock; } length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, fsi->bool_pending_values[index]); mutex_unlock(&selinux_state.policy_mutex); ret = simple_read_from_buffer(buf, count, ppos, page, length); out_free: free_page((unsigned long)page); return ret; out_unlock: mutex_unlock(&selinux_state.policy_mutex); goto out_free; } 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; if (count >= PAGE_SIZE) return -ENOMEM; /* No partial writes. */ if (*ppos != 0) return -EINVAL; page = memdup_user_nul(buf, count); if (IS_ERR(page)) return PTR_ERR(page); mutex_lock(&selinux_state.policy_mutex); length = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__SETBOOL, NULL); if (length) goto out; length = -EINVAL; if (index >= fsi->bool_num || strcmp(name, fsi->bool_pending_names[index])) goto out; length = -EINVAL; if (sscanf(page, "%d", &new_value) != 1) goto out; if (new_value) new_value = 1; fsi->bool_pending_values[index] = new_value; length = count; out: mutex_unlock(&selinux_state.policy_mutex); kfree(page); return length; } static const struct file_operations sel_bool_ops = { .read = sel_read_bool, .write = sel_write_bool, .llseek = generic_file_llseek, }; 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; if (count >= PAGE_SIZE) return -ENOMEM; /* No partial writes. */ if (*ppos != 0) return -EINVAL; page = memdup_user_nul(buf, count); if (IS_ERR(page)) return PTR_ERR(page); mutex_lock(&selinux_state.policy_mutex); length = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__SETBOOL, NULL); if (length) goto out; length = -EINVAL; if (sscanf(page, "%d", &new_value) != 1) goto out; length = 0; if (new_value && fsi->bool_pending_values) length = security_set_bools(fsi->bool_num, fsi->bool_pending_values); if (!length) length = count; out: mutex_unlock(&selinux_state.policy_mutex); kfree(page); return length; } static const struct file_operations sel_commit_bools_ops = { .write = sel_commit_bools_write, .llseek = generic_file_llseek, }; static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir, unsigned int *bool_num, char ***bool_pending_names, int **bool_pending_values) { int ret; char **names, *page; u32 i, num; page = (char *)get_zeroed_page(GFP_KERNEL); if (!page) return -ENOMEM; ret = security_get_bools(newpolicy, &num, &names, bool_pending_values); if (ret) goto out; *bool_num = num; *bool_pending_names = names; for (i = 0; i < num; i++) { struct dentry *dentry; struct inode *inode; struct inode_security_struct *isec; ssize_t len; u32 sid; len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); if (len >= PAGE_SIZE) { ret = -ENAMETOOLONG; break; } dentry = d_alloc_name(bool_dir, names[i]); if (!dentry) { ret = -ENOMEM; break; } inode = sel_make_inode(bool_dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); if (!inode) { dput(dentry); ret = -ENOMEM; break; } isec = selinux_inode(inode); ret = selinux_policy_genfs_sid(newpolicy, "selinuxfs", page, SECCLASS_FILE, &sid); if (ret) { pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n", page); sid = SECINITSID_SECURITY; } isec->sid = sid; isec->initialized = LABEL_INITIALIZED; inode->i_fop = &sel_bool_ops; inode->i_ino = i|SEL_BOOL_INO_OFFSET; d_add(dentry, inode); } out: free_page((unsigned long)page); return ret; } static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { char tmpbuf[TMPBUFLEN]; ssize_t length; length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_get_cache_threshold()); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } static ssize_t sel_write_avc_cache_threshold(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { char *page; ssize_t ret; unsigned int new_value; ret = avc_has_perm(current_sid(), SECINITSID_SECURITY, SECCLASS_SECURITY, SECURITY__SETSECPARAM, NULL); if (ret) return ret; if (count >= PAGE_SIZE) return -ENOMEM; /* No partial writes. */ if (*ppos != 0) return -EINVAL; page = memdup_user_nul(buf, count); if (IS_ERR(page)) return PTR_ERR(page); ret = -EINVAL; if (sscanf(page, "%u", &new_value) != 1) goto out; avc_set_cache_threshold(new_value); ret = count; out: kfree(page); return ret; } static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { char *page; ssize_t length; page = (char *)__get_free_page(GFP_KERNEL); if (!page) return -ENOMEM; length = avc_get_hash_stats(page); if (length >= 0) length = simple_read_from_buffer(buf, count, ppos, page, length); free_page((unsigned long)page); return length; } static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { char *page; ssize_t length; page = (char *)__get_free_page(GFP_KERNEL); if (!page) return -ENOMEM; length = security_sidtab_hash_stats(page); if (length >= 0) length = simple_read_from_buffer(buf, count, ppos, page, length); free_page((unsigned long)page); return length; } static const struct file_operations sel_sidtab_hash_stats_ops = { .read = sel_read_sidtab_hash_stats, .llseek = generic_file_llseek, }; static const struct file_operations sel_avc_cache_threshold_ops = { .read = sel_read_avc_cache_threshold, .write = sel_write_avc_cache_threshold, .llseek = generic_file_llseek, }; static const struct file_operations sel_avc_hash_stats_ops = { .read = sel_read_avc_hash_stats, .llseek = generic_file_llseek, }; #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) { int cpu; for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { if (!cpu_possible(cpu)) continue; *idx = cpu + 1; return &per_cpu(avc_cache_stats, cpu); } (*idx)++; return NULL; } static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) { loff_t n = *pos - 1; if (*pos == 0) return SEQ_START_TOKEN; return sel_avc_get_stat_idx(&n); } static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) { return sel_avc_get_stat_idx(pos); } static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) { struct avc_cache_stats *st = v; if (v == SEQ_START_TOKEN) { seq_puts(seq, "lookups hits misses allocations reclaims frees\n"); } else { unsigned int lookups = st->lookups; unsigned int misses = st->misses; unsigned int hits = lookups - misses; seq_printf(seq, "%u %u %u %u %u %u\n", lookups, hits, misses, st->allocations, st->reclaims, st->frees); } return 0; } static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) { } static const struct seq_operations sel_avc_cache_stats_seq_ops = { .start = sel_avc_stats_seq_start, .next = sel_avc_stats_seq_next, .show = sel_avc_stats_seq_show, .stop = sel_avc_stats_seq_stop, }; static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) { return seq_open(file, &sel_avc_cache_stats_seq_ops); } static const struct file_operations sel_avc_cache_stats_ops = { .open = sel_open_avc_cache_stats, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; #endif 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; unsigned int i; static const struct tree_descr files[] = { { "cache_threshold", &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, #endif }; for (i = 0; i < ARRAY_SIZE(files); i++) { struct inode *inode; struct dentry *dentry; dentry = d_alloc_name(dir, files[i].name); if (!dentry) return -ENOMEM; inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); if (!inode) { dput(dentry); return -ENOMEM; } inode->i_fop = files[i].ops; inode->i_ino = ++fsi->last_ino; d_add(dentry, inode); } return 0; } static int sel_make_ss_files(struct dentry *dir) { struct super_block *sb = dir->d_sb; struct selinux_fs_info *fsi = sb->s_fs_info; unsigned int i; static const struct tree_descr files[] = { { "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO }, }; for (i = 0; i < ARRAY_SIZE(files); i++) { struct inode *inode; struct dentry *dentry; dentry = d_alloc_name(dir, files[i].name); if (!dentry) return -ENOMEM; inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); if (!inode) { dput(dentry); return -ENOMEM; } inode->i_fop = files[i].ops; inode->i_ino = ++fsi->last_ino; d_add(dentry, inode); } return 0; } static ssize_t sel_read_initcon(struct file *file, char __user *buf, size_t count, loff_t *ppos) { char *con; u32 sid, len; ssize_t ret; sid = file_inode(file)->i_ino&SEL_INO_MASK; ret = security_sid_to_context(sid, &con, &len); if (ret) return ret; ret = simple_read_from_buffer(buf, count, ppos, con, len); kfree(con); return ret; } static const struct file_operations sel_initcon_ops = { .read = sel_read_initcon, .llseek = generic_file_llseek, }; static int sel_make_initcon_files(struct dentry *dir) { unsigned int i; for (i = 1; i <= SECINITSID_NUM; i++) { struct inode *inode; struct dentry *dentry; const char *s = security_get_initial_sid_context(i); if (!s) continue; dentry = d_alloc_name(dir, s); if (!dentry) return -ENOMEM; inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); if (!inode) { dput(dentry); return -ENOMEM; } inode->i_fop = &sel_initcon_ops; inode->i_ino = i|SEL_INITCON_INO_OFFSET; d_add(dentry, inode); } return 0; } static inline unsigned long sel_class_to_ino(u16 class) { return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; } static inline u16 sel_ino_to_class(unsigned long ino) { return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1); } static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) { return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; } static inline u32 sel_ino_to_perm(unsigned long ino) { return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); } static ssize_t sel_read_class(struct file *file, char __user *buf, size_t count, loff_t *ppos) { unsigned long ino = file_inode(file)->i_ino; char res[TMPBUFLEN]; ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino)); return simple_read_from_buffer(buf, count, ppos, res, len); } static const struct file_operations sel_class_ops = { .read = sel_read_class, .llseek = generic_file_llseek, }; static ssize_t sel_read_perm(struct file *file, char __user *buf, size_t count, loff_t *ppos) { unsigned long ino = file_inode(file)->i_ino; char res[TMPBUFLEN]; ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino)); return simple_read_from_buffer(buf, count, ppos, res, len); } static const struct file_operations sel_perm_ops = { .read = sel_read_perm, .llseek = generic_file_llseek, }; static ssize_t sel_read_policycap(struct file *file, char __user *buf, size_t count, loff_t *ppos) { int value; char tmpbuf[TMPBUFLEN]; ssize_t length; unsigned long i_ino = file_inode(file)->i_ino; value = security_policycap_supported(i_ino & SEL_INO_MASK); length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } static const struct file_operations sel_policycap_ops = { .read = sel_read_policycap, .llseek = generic_file_llseek, }; static int sel_make_perm_files(struct selinux_policy *newpolicy, char *objclass, int classvalue, struct dentry *dir) { u32 i, nperms; int rc; char **perms; rc = security_get_permissions(newpolicy, objclass, &perms, &nperms); if (rc) return rc; for (i = 0; i < nperms; i++) { struct inode *inode; struct dentry *dentry; rc = -ENOMEM; dentry = d_alloc_name(dir, perms[i]); if (!dentry) goto out; rc = -ENOMEM; inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); if (!inode) { dput(dentry); goto out; } inode->i_fop = &sel_perm_ops; /* i+1 since perm values are 1-indexed */ inode->i_ino = sel_perm_to_ino(classvalue, i + 1); d_add(dentry, inode); } rc = 0; out: for (i = 0; i < nperms; i++) kfree(perms[i]); kfree(perms); return rc; } static int sel_make_class_dir_entries(struct selinux_policy *newpolicy, 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; dentry = d_alloc_name(dir, "index"); if (!dentry) return -ENOMEM; inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); if (!inode) { dput(dentry); return -ENOMEM; } inode->i_fop = &sel_class_ops; inode->i_ino = sel_class_to_ino(index); d_add(dentry, inode); dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino); if (IS_ERR(dentry)) return PTR_ERR(dentry); return sel_make_perm_files(newpolicy, classname, index, dentry); } static int sel_make_classes(struct selinux_policy *newpolicy, struct dentry *class_dir, unsigned long *last_class_ino) { u32 i, nclasses; int rc; char **classes; rc = security_get_classes(newpolicy, &classes, &nclasses); if (rc) return rc; /* +2 since classes are 1-indexed */ *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); if (IS_ERR(class_name_dir)) { rc = PTR_ERR(class_name_dir); goto out; } /* i+1 since class values are 1-indexed */ rc = sel_make_class_dir_entries(newpolicy, classes[i], i + 1, class_name_dir); if (rc) goto out; } rc = 0; out: for (i = 0; i < nclasses; i++) kfree(classes[i]); kfree(classes); return rc; } static int sel_make_policycap(struct selinux_fs_info *fsi) { unsigned int iter; struct dentry *dentry = NULL; struct inode *inode = NULL; for (iter = 0; iter <= POLICYDB_CAP_MAX; iter++) { if (iter < ARRAY_SIZE(selinux_policycap_names)) dentry = d_alloc_name(fsi->policycap_dir, selinux_policycap_names[iter]); else dentry = d_alloc_name(fsi->policycap_dir, "unknown"); if (dentry == NULL) return -ENOMEM; inode = sel_make_inode(fsi->sb, S_IFREG | 0444); if (inode == NULL) { dput(dentry); return -ENOMEM; } inode->i_fop = &sel_policycap_ops; inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; d_add(dentry, inode); } return 0; } static struct dentry *sel_make_dir(struct dentry *dir, const char *name, unsigned long *ino) { struct dentry *dentry = d_alloc_name(dir, name); struct inode *inode; if (!dentry) return ERR_PTR(-ENOMEM); inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO); if (!inode) { dput(dentry); return ERR_PTR(-ENOMEM); } inode->i_op = &simple_dir_inode_operations; inode->i_fop = &simple_dir_operations; inode->i_ino = ++(*ino); /* directory inodes start off with i_nlink == 2 (for "." entry) */ inc_nlink(inode); d_add(dentry, inode); /* bump link count on parent directory, too */ inc_nlink(d_inode(dir)); return dentry; } static int reject_all(struct mnt_idmap *idmap, struct inode *inode, int mask) { return -EPERM; // no access for anyone, root or no root. } static const struct inode_operations swapover_dir_inode_operations = { .lookup = simple_lookup, .permission = reject_all, }; static struct dentry *sel_make_swapover_dir(struct super_block *sb, unsigned long *ino) { struct dentry *dentry = d_alloc_name(sb->s_root, ".swapover"); struct inode *inode; if (!dentry) return ERR_PTR(-ENOMEM); inode = sel_make_inode(sb, S_IFDIR); if (!inode) { dput(dentry); return ERR_PTR(-ENOMEM); } inode->i_op = &swapover_dir_inode_operations; inode->i_ino = ++(*ino); /* directory inodes start off with i_nlink == 2 (for "." entry) */ inc_nlink(inode); inode_lock(sb->s_root->d_inode); d_add(dentry, inode); inc_nlink(sb->s_root->d_inode); inode_unlock(sb->s_root->d_inode); return dentry; } #define NULL_FILE_NAME "null" static int sel_fill_super(struct super_block *sb, struct fs_context *fc) { struct selinux_fs_info *fsi; int ret; struct dentry *dentry; struct inode *inode; struct inode_security_struct *isec; static const struct tree_descr selinux_files[] = { [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO}, [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops, 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; 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; } ret = -ENOMEM; dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); if (!dentry) goto err; ret = -ENOMEM; inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); if (!inode) { dput(dentry); goto err; } inode->i_ino = ++fsi->last_ino; isec = selinux_inode(inode); isec->sid = SECINITSID_DEVNULL; isec->sclass = SECCLASS_CHR_FILE; isec->initialized = LABEL_INITIALIZED; init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); d_add(dentry, inode); dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino); if (IS_ERR(dentry)) { ret = PTR_ERR(dentry); goto err; } ret = sel_make_avc_files(dentry); if (ret) goto err; dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino); if (IS_ERR(dentry)) { ret = PTR_ERR(dentry); goto err; } ret = sel_make_ss_files(dentry); if (ret) goto err; dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino); if (IS_ERR(dentry)) { ret = PTR_ERR(dentry); goto err; } ret = sel_make_initcon_files(dentry); if (ret) goto err; fsi->class_dir = sel_make_dir(sb->s_root, CLASS_DIR_NAME, &fsi->last_ino); if (IS_ERR(fsi->class_dir)) { ret = PTR_ERR(fsi->class_dir); fsi->class_dir = NULL; goto err; } fsi->policycap_dir = sel_make_dir(sb->s_root, POLICYCAP_DIR_NAME, &fsi->last_ino); if (IS_ERR(fsi->policycap_dir)) { ret = PTR_ERR(fsi->policycap_dir); fsi->policycap_dir = NULL; goto err; } ret = sel_make_policycap(fsi); if (ret) { pr_err("SELinux: failed to load policy capabilities\n"); goto err; } return 0; err: pr_err("SELinux: %s: failed while creating inodes\n", __func__); selinux_fs_info_free(sb); return ret; } static int sel_get_tree(struct fs_context *fc) { return get_tree_single(fc, sel_fill_super); } static const struct fs_context_operations sel_context_ops = { .get_tree = sel_get_tree, }; static int sel_init_fs_context(struct fs_context *fc) { fc->ops = &sel_context_ops; return 0; } 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", .init_fs_context = sel_init_fs_context, .kill_sb = sel_kill_sb, }; struct path selinux_null __ro_after_init; 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_boot) return 0; err = sysfs_create_mount_point(fs_kobj, "selinux"); if (err) return err; err = register_filesystem(&sel_fs_type); if (err) { sysfs_remove_mount_point(fs_kobj, "selinux"); return err; } selinux_null.mnt = kern_mount(&sel_fs_type); if (IS_ERR(selinux_null.mnt)) { pr_err("selinuxfs: could not mount!\n"); err = PTR_ERR(selinux_null.mnt); selinux_null.mnt = NULL; return err; } 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; } /* * Try to pre-allocate the status page, so the sequence number of the * initial policy load can be stored. */ (void) selinux_kernel_status_page(); return err; } __initcall(init_sel_fs);
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