diff options
Diffstat (limited to 'security/selinux/selinuxfs.c')
| -rw-r--r-- | security/selinux/selinuxfs.c | 1591 |
1 files changed, 1096 insertions, 495 deletions
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index a45cc971e73..c71737f6d1c 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -1,28 +1,35 @@ /* Updated: Karl MacMillan <kmacmillan@tresys.com> * - * Added conditional policy language extensions + * 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> * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by + * it under the terms of the GNU General Public License as published by * the Free Software Foundation, version 2. */ -#include <linux/config.h> #include <linux/kernel.h> #include <linux/pagemap.h> #include <linux/slab.h> #include <linux/vmalloc.h> #include <linux/fs.h> +#include <linux/mutex.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 <asm/uaccess.h> -#include <asm/semaphore.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. */ @@ -34,36 +41,58 @@ #include "objsec.h" #include "conditional.h" +/* Policy capability filenames */ +static char *policycap_names[] = { + "network_peer_controls", + "open_perms", + "redhat1", + "always_check_network" +}; + unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; static int __init checkreqprot_setup(char *str) { - selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0; + unsigned long checkreqprot; + if (!kstrtoul(str, 0, &checkreqprot)) + selinux_checkreqprot = checkreqprot ? 1 : 0; return 1; } __setup("checkreqprot=", checkreqprot_setup); - -static DECLARE_MUTEX(sel_sem); +static DEFINE_MUTEX(sel_mutex); /* global data for booleans */ -static struct dentry *bool_dir = NULL; -static int bool_num = 0; -static int *bool_pending_values = NULL; +static struct dentry *bool_dir; +static int bool_num; +static char **bool_pending_names; +static int *bool_pending_values; -extern void selnl_notify_setenforce(int val); +/* 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; /* Check whether a task is allowed to use a security operation. */ static int task_has_security(struct task_struct *tsk, u32 perms) { - struct task_security_struct *tsec; - - tsec = tsk->security; + const struct task_security_struct *tsec; + u32 sid = 0; + + rcu_read_lock(); + tsec = __task_cred(tsk)->security; + if (tsec) + sid = tsec->sid; + rcu_read_unlock(); if (!tsec) return -EACCES; - return avc_has_perm(tsec->sid, SECINITSID_SECURITY, + return avc_has_perm(sid, SECINITSID_SECURITY, SECCLASS_SECURITY, perms, NULL); } @@ -80,11 +109,24 @@ enum sel_inos { SEL_COMMIT_BOOLS, /* commit new boolean values */ SEL_MLS, /* return if MLS policy is enabled */ SEL_DISABLE, /* disable SELinux until next reboot */ - SEL_AVC, /* AVC management directory */ 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_INO_NEXT, /* The next inode number to use */ }; +static unsigned long sel_last_ino = SEL_INO_NEXT - 1; + +#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 TMPBUFLEN 12 static ssize_t sel_read_enforce(struct file *filp, char __user *buf, size_t count, loff_t *ppos) @@ -97,23 +139,28 @@ static ssize_t sel_read_enforce(struct file *filp, char __user *buf, } #ifdef CONFIG_SECURITY_SELINUX_DEVELOP -static ssize_t sel_write_enforce(struct file * file, const char __user * buf, +static ssize_t sel_write_enforce(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - char *page; + char *page = NULL; ssize_t length; int new_value; - if (count < 0 || count >= PAGE_SIZE) - return -ENOMEM; - if (*ppos != 0) { - /* No partial writes. */ - return -EINVAL; - } - page = (char*)get_zeroed_page(GFP_KERNEL); + length = -ENOMEM; + if (count >= PAGE_SIZE) + goto out; + + /* No partial writes. */ + length = EINVAL; + if (*ppos != 0) + goto out; + + length = -ENOMEM; + page = (char *)get_zeroed_page(GFP_KERNEL); if (!page) - return -ENOMEM; + goto out; + length = -EFAULT; if (copy_from_user(page, buf, count)) goto out; @@ -126,10 +173,16 @@ static ssize_t sel_write_enforce(struct file * file, const char __user * buf, length = task_has_security(current, SECURITY__SETENFORCE); if (length) goto out; + audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, + "enforcing=%d old_enforcing=%d auid=%u ses=%u", + new_value, selinux_enforcing, + from_kuid(&init_user_ns, audit_get_loginuid(current)), + audit_get_sessionid(current)); selinux_enforcing = new_value; if (selinux_enforcing) avc_ss_reset(0); selnl_notify_setenforce(selinux_enforcing); + selinux_status_update_setenforce(selinux_enforcing); } length = count; out: @@ -140,30 +193,106 @@ out: #define sel_write_enforce NULL #endif -static struct file_operations sel_enforce_ops = { +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 */ + vma->vm_flags &= ~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, }; #ifdef CONFIG_SECURITY_SELINUX_DISABLE -static ssize_t sel_write_disable(struct file * file, const char __user * buf, +static ssize_t sel_write_disable(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - char *page; + char *page = NULL; ssize_t length; int new_value; - extern int selinux_disable(void); - if (count < 0 || count >= PAGE_SIZE) - return -ENOMEM; - if (*ppos != 0) { - /* No partial writes. */ - return -EINVAL; - } - page = (char*)get_zeroed_page(GFP_KERNEL); + length = -ENOMEM; + if (count >= PAGE_SIZE) + goto out; + + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) + goto out; + + length = -ENOMEM; + page = (char *)get_zeroed_page(GFP_KERNEL); if (!page) - return -ENOMEM; + goto out; + length = -EFAULT; if (copy_from_user(page, buf, count)) goto out; @@ -174,8 +303,12 @@ static ssize_t sel_write_disable(struct file * file, const char __user * buf, if (new_value) { length = selinux_disable(); - if (length < 0) + if (length) goto out; + audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, + "selinux=0 auid=%u ses=%u", + from_kuid(&init_user_ns, audit_get_loginuid(current)), + audit_get_sessionid(current)); } length = count; @@ -187,12 +320,13 @@ out: #define sel_write_disable NULL #endif -static struct file_operations sel_disable_ops = { +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) + size_t count, loff_t *ppos) { char tmpbuf[TMPBUFLEN]; ssize_t length; @@ -201,12 +335,19 @@ static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } -static struct file_operations sel_policyvers_ops = { +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(void); +static int sel_make_classes(void); +static int sel_make_policycap(void); + +/* declaration for sel_make_class_dirs */ +static struct dentry *sel_make_dir(struct dentry *dir, const char *name, + unsigned long *ino); static ssize_t sel_read_mls(struct file *filp, char __user *buf, size_t count, loff_t *ppos) @@ -214,39 +355,178 @@ static ssize_t sel_read_mls(struct file *filp, char __user *buf, char tmpbuf[TMPBUFLEN]; ssize_t length; - length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled); + length = scnprintf(tmpbuf, TMPBUFLEN, "%d", + security_mls_enabled()); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } -static struct file_operations sel_mls_ops = { +static const struct file_operations sel_mls_ops = { .read = sel_read_mls, + .llseek = generic_file_llseek, }; -static ssize_t sel_write_load(struct file * file, const char __user * buf, - size_t count, loff_t *ppos) +struct policy_load_memory { + size_t len; + void *data; +}; +static int sel_open_policy(struct inode *inode, struct file *filp) { + struct policy_load_memory *plm = NULL; + int rc; + + BUG_ON(filp->private_data); + + mutex_lock(&sel_mutex); + + rc = task_has_security(current, SECURITY__READ_POLICY); + if (rc) + goto err; + + rc = -EBUSY; + if (policy_opened) + goto err; + + rc = -ENOMEM; + plm = kzalloc(sizeof(*plm), GFP_KERNEL); + if (!plm) + goto err; + + if (i_size_read(inode) != security_policydb_len()) { + mutex_lock(&inode->i_mutex); + i_size_write(inode, security_policydb_len()); + mutex_unlock(&inode->i_mutex); + } + + rc = security_read_policy(&plm->data, &plm->len); + if (rc) + goto err; + + policy_opened = 1; + + filp->private_data = plm; + + mutex_unlock(&sel_mutex); + + return 0; +err: + mutex_unlock(&sel_mutex); + + if (plm) + vfree(plm->data); + kfree(plm); + return rc; +} + +static int sel_release_policy(struct inode *inode, struct file *filp) +{ + struct policy_load_memory *plm = filp->private_data; + + BUG_ON(!plm); + + 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; + + mutex_lock(&sel_mutex); + + ret = task_has_security(current, SECURITY__READ_POLICY); + if (ret) + goto out; + + ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); +out: + mutex_unlock(&sel_mutex); + return ret; +} + +static int sel_mmap_policy_fault(struct vm_area_struct *vma, + struct vm_fault *vmf) +{ + struct policy_load_memory *plm = 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 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 */ + vma->vm_flags &= ~VM_MAYWRITE; + + if (vma->vm_flags & VM_WRITE) + return -EACCES; + } + + vma->vm_flags |= 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 ssize_t sel_write_load(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) + +{ ssize_t length; void *data = NULL; - down(&sel_sem); + mutex_lock(&sel_mutex); length = task_has_security(current, SECURITY__LOAD_POLICY); if (length) goto out; - if (*ppos != 0) { - /* No partial writes. */ - length = -EINVAL; + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) goto out; - } - if ((count < 0) || (count > 64 * 1024 * 1024) - || (data = vmalloc(count)) == NULL) { - length = -ENOMEM; + length = -EFBIG; + if (count > 64 * 1024 * 1024) + goto out; + + length = -ENOMEM; + data = vmalloc(count); + if (!data) goto out; - } length = -EFAULT; if (copy_from_user(data, buf, count) != 0) @@ -256,61 +536,68 @@ static ssize_t sel_write_load(struct file * file, const char __user * buf, if (length) goto out; - ret = sel_make_bools(); - if (ret) - length = ret; - else - length = count; + length = sel_make_bools(); + if (length) + goto out1; + + length = sel_make_classes(); + if (length) + goto out1; + + length = sel_make_policycap(); + if (length) + goto out1; + + length = count; + +out1: + audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, + "policy loaded auid=%u ses=%u", + from_kuid(&init_user_ns, audit_get_loginuid(current)), + audit_get_sessionid(current)); out: - up(&sel_sem); + mutex_unlock(&sel_mutex); vfree(data); return length; } -static struct file_operations sel_load_ops = { +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, const char __user * buf, - size_t count, loff_t *ppos) - +static ssize_t sel_write_context(struct file *file, char *buf, size_t size) { - char *page; - u32 sid; + char *canon = NULL; + u32 sid, len; ssize_t length; length = task_has_security(current, SECURITY__CHECK_CONTEXT); if (length) - return length; + goto out; - if (count < 0 || count >= PAGE_SIZE) - return -ENOMEM; - if (*ppos != 0) { - /* No partial writes. */ - return -EINVAL; - } - page = (char*)get_zeroed_page(GFP_KERNEL); - if (!page) - return -ENOMEM; - length = -EFAULT; - if (copy_from_user(page, buf, count)) + length = security_context_to_sid(buf, size, &sid, GFP_KERNEL); + if (length) goto out; - length = security_context_to_sid(page, count, &sid); - if (length < 0) + length = security_sid_to_context(sid, &canon, &len); + if (length) goto out; - length = count; + length = -ERANGE; + if (len > SIMPLE_TRANSACTION_LIMIT) { + printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " + "payload max\n", __func__, len); + goto out; + } + + memcpy(buf, canon, len); + length = len; out: - free_page((unsigned long) page); + kfree(canon); return length; } -static struct file_operations sel_context_ops = { - .write = sel_write_context, -}; - static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { @@ -321,26 +608,31 @@ static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } -static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf, +static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - char *page; + char *page = NULL; ssize_t length; unsigned int new_value; length = task_has_security(current, SECURITY__SETCHECKREQPROT); if (length) - return length; + goto out; - if (count < 0 || count >= PAGE_SIZE) - return -ENOMEM; - if (*ppos != 0) { - /* No partial writes. */ - return -EINVAL; - } - page = (char*)get_zeroed_page(GFP_KERNEL); + length = -ENOMEM; + if (count >= PAGE_SIZE) + goto out; + + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) + goto out; + + length = -ENOMEM; + page = (char *)get_zeroed_page(GFP_KERNEL); if (!page) - return -ENOMEM; + goto out; + length = -EFAULT; if (copy_from_user(page, buf, count)) goto out; @@ -355,19 +647,20 @@ out: free_page((unsigned long) page); return length; } -static struct file_operations sel_checkreqprot_ops = { +static const struct file_operations sel_checkreqprot_ops = { .read = sel_read_checkreqprot, .write = sel_write_checkreqprot, + .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 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 (*write_op[])(struct file *, char *, size_t) = { [SEL_ACCESS] = sel_write_access, @@ -375,33 +668,35 @@ static ssize_t (*write_op[])(struct file *, char *, size_t) = { [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->f_dentry->d_inode->i_ino; + ino_t ino = file_inode(file)->i_ino; char *data; ssize_t rv; - if (ino >= sizeof(write_op)/sizeof(write_op[0]) || !write_op[ino]) + 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) { + rv = write_op[ino](file, data, size); + if (rv > 0) { simple_transaction_set(file, rv); rv = size; } return rv; } -static struct file_operations transaction_ops = { +static const struct file_operations transaction_ops = { .write = selinux_transaction_write, .read = simple_transaction_read, .release = simple_transaction_release, + .llseek = generic_file_llseek, }; /* @@ -410,181 +705,218 @@ static struct file_operations transaction_ops = { * and the length returned. Otherwise return 0 or and -error. */ -static ssize_t sel_write_access(struct file * file, char *buf, size_t size) +static ssize_t sel_write_access(struct file *file, char *buf, size_t size) { - char *scon, *tcon; + char *scon = NULL, *tcon = NULL; u32 ssid, tsid; u16 tclass; - u32 req; struct av_decision avd; ssize_t length; length = task_has_security(current, SECURITY__COMPUTE_AV); if (length) - return length; + goto out; length = -ENOMEM; - scon = kmalloc(size+1, GFP_KERNEL); + scon = kzalloc(size + 1, GFP_KERNEL); if (!scon) - return length; - memset(scon, 0, size+1); + goto out; - tcon = kmalloc(size+1, GFP_KERNEL); + length = -ENOMEM; + tcon = kzalloc(size + 1, GFP_KERNEL); if (!tcon) goto out; - memset(tcon, 0, size+1); length = -EINVAL; - if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4) - goto out2; + if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) + goto out; - length = security_context_to_sid(scon, strlen(scon)+1, &ssid); - if (length < 0) - goto out2; - length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); - if (length < 0) - goto out2; + length = security_context_to_sid(scon, strlen(scon) + 1, &ssid, + GFP_KERNEL); + if (length) + goto out; + + length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid, + GFP_KERNEL); + if (length) + goto out; - length = security_compute_av(ssid, tsid, tclass, req, &avd); - if (length < 0) - goto out2; + security_compute_av_user(ssid, tsid, tclass, &avd); length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, - "%x %x %x %x %u", - avd.allowed, avd.decided, + "%x %x %x %x %u %x", + avd.allowed, 0xffffffff, avd.auditallow, avd.auditdeny, - avd.seqno); -out2: - kfree(tcon); + 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) +static ssize_t sel_write_create(struct file *file, char *buf, size_t size) { - char *scon, *tcon; + char *scon = NULL, *tcon = NULL; + char *namebuf = NULL, *objname = NULL; u32 ssid, tsid, newsid; u16 tclass; ssize_t length; - char *newcon; + char *newcon = NULL; u32 len; + int nargs; length = task_has_security(current, SECURITY__COMPUTE_CREATE); if (length) - return length; + goto out; length = -ENOMEM; - scon = kmalloc(size+1, GFP_KERNEL); + scon = kzalloc(size + 1, GFP_KERNEL); if (!scon) - return length; - memset(scon, 0, size+1); + goto out; - tcon = kmalloc(size+1, GFP_KERNEL); + length = -ENOMEM; + tcon = kzalloc(size + 1, GFP_KERNEL); if (!tcon) goto out; - memset(tcon, 0, size+1); + + length = -ENOMEM; + namebuf = kzalloc(size + 1, GFP_KERNEL); + if (!namebuf) + goto out; length = -EINVAL; - if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) - goto out2; + 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; splitted 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_to_sid(scon, strlen(scon) + 1, &ssid, + GFP_KERNEL); + if (length) + goto out; - length = security_context_to_sid(scon, strlen(scon)+1, &ssid); - if (length < 0) - goto out2; - length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); - if (length < 0) - goto out2; + length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid, + GFP_KERNEL); + if (length) + goto out; - length = security_transition_sid(ssid, tsid, tclass, &newsid); - if (length < 0) - goto out2; + length = security_transition_sid_user(ssid, tsid, tclass, + objname, &newsid); + if (length) + goto out; length = security_sid_to_context(newsid, &newcon, &len); - if (length < 0) - goto out2; + if (length) + goto out; + length = -ERANGE; if (len > SIMPLE_TRANSACTION_LIMIT) { - printk(KERN_ERR "%s: context size (%u) exceeds payload " - "max\n", __FUNCTION__, len); - length = -ERANGE; - goto out3; + printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " + "payload max\n", __func__, len); + goto out; } memcpy(buf, newcon, len); length = len; -out3: +out: kfree(newcon); -out2: + kfree(namebuf); kfree(tcon); -out: kfree(scon); return length; } -static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size) +static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) { - char *scon, *tcon; + char *scon = NULL, *tcon = NULL; u32 ssid, tsid, newsid; u16 tclass; ssize_t length; - char *newcon; + char *newcon = NULL; u32 len; length = task_has_security(current, SECURITY__COMPUTE_RELABEL); if (length) - return length; + goto out; length = -ENOMEM; - scon = kmalloc(size+1, GFP_KERNEL); + scon = kzalloc(size + 1, GFP_KERNEL); if (!scon) - return length; - memset(scon, 0, size+1); + goto out; - tcon = kmalloc(size+1, GFP_KERNEL); + length = -ENOMEM; + tcon = kzalloc(size + 1, GFP_KERNEL); if (!tcon) goto out; - memset(tcon, 0, size+1); length = -EINVAL; if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) - goto out2; + goto out; - length = security_context_to_sid(scon, strlen(scon)+1, &ssid); - if (length < 0) - goto out2; - length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); - if (length < 0) - goto out2; + length = security_context_to_sid(scon, strlen(scon) + 1, &ssid, + GFP_KERNEL); + if (length) + goto out; + + length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid, + GFP_KERNEL); + if (length) + goto out; length = security_change_sid(ssid, tsid, tclass, &newsid); - if (length < 0) - goto out2; + if (length) + goto out; length = security_sid_to_context(newsid, &newcon, &len); - if (length < 0) - goto out2; + if (length) + goto out; - if (len > SIMPLE_TRANSACTION_LIMIT) { - length = -ERANGE; - goto out3; - } + length = -ERANGE; + if (len > SIMPLE_TRANSACTION_LIMIT) + goto out; memcpy(buf, newcon, len); length = len; -out3: +out: kfree(newcon); -out2: kfree(tcon); -out: kfree(scon); return length; } -static ssize_t sel_write_user(struct file * file, char *buf, size_t size) +static ssize_t sel_write_user(struct file *file, char *buf, size_t size) { - char *con, *user, *ptr; - u32 sid, *sids; + char *con = NULL, *user = NULL, *ptr; + u32 sid, *sids = NULL; ssize_t length; char *newcon; int i, rc; @@ -592,30 +924,29 @@ static ssize_t sel_write_user(struct file * file, char *buf, size_t size) length = task_has_security(current, SECURITY__COMPUTE_USER); if (length) - return length; + goto out; length = -ENOMEM; - con = kmalloc(size+1, GFP_KERNEL); + con = kzalloc(size + 1, GFP_KERNEL); if (!con) - return length; - memset(con, 0, size+1); + goto out; - user = kmalloc(size+1, GFP_KERNEL); + length = -ENOMEM; + user = kzalloc(size + 1, GFP_KERNEL); if (!user) goto out; - memset(user, 0, size+1); length = -EINVAL; if (sscanf(buf, "%s %s", con, user) != 2) - goto out2; + goto out; - length = security_context_to_sid(con, strlen(con)+1, &sid); - if (length < 0) - goto out2; + length = security_context_to_sid(con, strlen(con) + 1, &sid, GFP_KERNEL); + if (length) + goto out; length = security_get_user_sids(sid, user, &sids, &nsids); - if (length < 0) - goto out2; + if (length) + goto out; length = sprintf(buf, "%u", nsids) + 1; ptr = buf + length; @@ -623,84 +954,82 @@ static ssize_t sel_write_user(struct file * file, char *buf, size_t size) rc = security_sid_to_context(sids[i], &newcon, &len); if (rc) { length = rc; - goto out3; + goto out; } if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { kfree(newcon); length = -ERANGE; - goto out3; + goto out; } memcpy(ptr, newcon, len); kfree(newcon); ptr += len; length += len; } -out3: +out: kfree(sids); -out2: kfree(user); -out: kfree(con); return length; } -static ssize_t sel_write_member(struct file * file, char *buf, size_t size) +static ssize_t sel_write_member(struct file *file, char *buf, size_t size) { - char *scon, *tcon; + char *scon = NULL, *tcon = NULL; u32 ssid, tsid, newsid; u16 tclass; ssize_t length; - char *newcon; + char *newcon = NULL; u32 len; length = task_has_security(current, SECURITY__COMPUTE_MEMBER); if (length) - return length; + goto out; length = -ENOMEM; - scon = kmalloc(size+1, GFP_KERNEL); + scon = kzalloc(size + 1, GFP_KERNEL); if (!scon) - return length; - memset(scon, 0, size+1); + goto out; - tcon = kmalloc(size+1, GFP_KERNEL); + length = -ENOMEM; + tcon = kzalloc(size + 1, GFP_KERNEL); if (!tcon) goto out; - memset(tcon, 0, size+1); length = -EINVAL; if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) - goto out2; + goto out; + + length = security_context_to_sid(scon, strlen(scon) + 1, &ssid, + GFP_KERNEL); + if (length) + goto out; - length = security_context_to_sid(scon, strlen(scon)+1, &ssid); - if (length < 0) - goto out2; - length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); - if (length < 0) - goto out2; + length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid, + GFP_KERNEL); + if (length) + goto out; length = security_member_sid(ssid, tsid, tclass, &newsid); - if (length < 0) - goto out2; + if (length) + goto out; length = security_sid_to_context(newsid, &newcon, &len); - if (length < 0) - goto out2; + if (length) + goto out; + length = -ERANGE; if (len > SIMPLE_TRANSACTION_LIMIT) { - printk(KERN_ERR "%s: context size (%u) exceeds payload " - "max\n", __FUNCTION__, len); - length = -ERANGE; - goto out3; + printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " + "payload max\n", __func__, len); + goto out; } memcpy(buf, newcon, len); length = len; -out3: +out: kfree(newcon); -out2: kfree(tcon); -out: kfree(scon); return length; } @@ -711,74 +1040,43 @@ static struct inode *sel_make_inode(struct super_block *sb, int mode) if (ret) { ret->i_mode = mode; - ret->i_uid = ret->i_gid = 0; - ret->i_blksize = PAGE_CACHE_SIZE; - ret->i_blocks = 0; ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; } return ret; } -#define BOOL_INO_OFFSET 30 - static ssize_t sel_read_bool(struct file *filep, char __user *buf, size_t count, loff_t *ppos) { char *page = NULL; ssize_t length; - ssize_t end; ssize_t ret; int cur_enforcing; - struct inode *inode; + unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; + const char *name = filep->f_path.dentry->d_name.name; - down(&sel_sem); - - ret = -EFAULT; + mutex_lock(&sel_mutex); - /* check to see if this file has been deleted */ - if (!filep->f_op) + ret = -EINVAL; + if (index >= bool_num || strcmp(name, bool_pending_names[index])) goto out; - if (count < 0 || count > PAGE_SIZE) { - ret = -EINVAL; - goto out; - } - if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) { - ret = -ENOMEM; + ret = -ENOMEM; + page = (char *)get_zeroed_page(GFP_KERNEL); + if (!page) goto out; - } - inode = filep->f_dentry->d_inode; - cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET); + cur_enforcing = security_get_bool_value(index); if (cur_enforcing < 0) { ret = cur_enforcing; goto out; } - length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, - bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]); - if (length < 0) { - ret = length; - goto out; - } - - if (*ppos >= length) { - ret = 0; - goto out; - } - if (count + *ppos > length) - count = length - *ppos; - end = count + *ppos; - if (copy_to_user(buf, (char *) page + *ppos, count)) { - ret = -EFAULT; - goto out; - } - *ppos = end; - ret = count; + bool_pending_values[index]); + ret = simple_read_from_buffer(buf, count, ppos, page, length); out: - up(&sel_sem); - if (page) - free_page((unsigned long)page); + mutex_unlock(&sel_mutex); + free_page((unsigned long)page); return ret; } @@ -786,34 +1084,36 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf, size_t count, loff_t *ppos) { char *page = NULL; - ssize_t length = -EFAULT; + ssize_t length; int new_value; - struct inode *inode; + unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; + const char *name = filep->f_path.dentry->d_name.name; - down(&sel_sem); + mutex_lock(&sel_mutex); length = task_has_security(current, SECURITY__SETBOOL); if (length) goto out; - /* check to see if this file has been deleted */ - if (!filep->f_op) + length = -EINVAL; + if (index >= bool_num || strcmp(name, bool_pending_names[index])) goto out; - if (count < 0 || count >= PAGE_SIZE) { - length = -ENOMEM; + length = -ENOMEM; + if (count >= PAGE_SIZE) goto out; - } - if (*ppos != 0) { - /* No partial writes. */ + + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) goto out; - } - page = (char*)get_zeroed_page(GFP_KERNEL); - if (!page) { - length = -ENOMEM; + + length = -ENOMEM; + page = (char *)get_zeroed_page(GFP_KERNEL); + if (!page) goto out; - } + length = -EFAULT; if (copy_from_user(page, buf, count)) goto out; @@ -824,20 +1124,19 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf, if (new_value) new_value = 1; - inode = filep->f_dentry->d_inode; - bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value; + bool_pending_values[index] = new_value; length = count; out: - up(&sel_sem); - if (page) - free_page((unsigned long) page); + mutex_unlock(&sel_mutex); + free_page((unsigned long) page); return length; } -static struct file_operations sel_bool_ops = { - .read = sel_read_bool, - .write = sel_write_bool, +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, @@ -845,33 +1144,30 @@ static ssize_t sel_commit_bools_write(struct file *filep, size_t count, loff_t *ppos) { char *page = NULL; - ssize_t length = -EFAULT; + ssize_t length; int new_value; - down(&sel_sem); + mutex_lock(&sel_mutex); length = task_has_security(current, SECURITY__SETBOOL); if (length) goto out; - /* check to see if this file has been deleted */ - if (!filep->f_op) + length = -ENOMEM; + if (count >= PAGE_SIZE) goto out; - if (count < 0 || count >= PAGE_SIZE) { - length = -ENOMEM; - goto out; - } - if (*ppos != 0) { - /* No partial writes. */ + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) goto out; - } - page = (char*)get_zeroed_page(GFP_KERNEL); - if (!page) { - length = -ENOMEM; + + length = -ENOMEM; + page = (char *)get_zeroed_page(GFP_KERNEL); + if (!page) goto out; - } + length = -EFAULT; if (copy_from_user(page, buf, count)) goto out; @@ -879,67 +1175,57 @@ static ssize_t sel_commit_bools_write(struct file *filep, if (sscanf(page, "%d", &new_value) != 1) goto out; - if (new_value && bool_pending_values) { - security_set_bools(bool_num, bool_pending_values); - } + length = 0; + if (new_value && bool_pending_values) + length = security_set_bools(bool_num, bool_pending_values); - length = count; + if (!length) + length = count; out: - up(&sel_sem); - if (page) - free_page((unsigned long) page); + mutex_unlock(&sel_mutex); + free_page((unsigned long) page); return length; } -static struct file_operations sel_commit_bools_ops = { - .write = sel_commit_bools_write, +static const struct file_operations sel_commit_bools_ops = { + .write = sel_commit_bools_write, + .llseek = generic_file_llseek, }; -/* delete booleans - partial revoke() from - * fs/proc/generic.c proc_kill_inodes */ -static void sel_remove_bools(struct dentry *de) +static void sel_remove_entries(struct dentry *de) { - struct list_head *p, *node; - struct super_block *sb = de->d_sb; + struct list_head *node; - spin_lock(&dcache_lock); + spin_lock(&de->d_lock); node = de->d_subdirs.next; while (node != &de->d_subdirs) { - struct dentry *d = list_entry(node, struct dentry, d_child); + struct dentry *d = list_entry(node, struct dentry, d_u.d_child); + + spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED); list_del_init(node); if (d->d_inode) { - d = dget_locked(d); - spin_unlock(&dcache_lock); + dget_dlock(d); + spin_unlock(&de->d_lock); + spin_unlock(&d->d_lock); d_delete(d); simple_unlink(de->d_inode, d); dput(d); - spin_lock(&dcache_lock); - } + spin_lock(&de->d_lock); + } else + spin_unlock(&d->d_lock); node = de->d_subdirs.next; } - spin_unlock(&dcache_lock); - - file_list_lock(); - list_for_each(p, &sb->s_files) { - struct file * filp = list_entry(p, struct file, f_list); - struct dentry * dentry = filp->f_dentry; - - if (dentry->d_parent != de) { - continue; - } - filp->f_op = NULL; - } - file_list_unlock(); + spin_unlock(&de->d_lock); } #define BOOL_DIR_NAME "booleans" static int sel_make_bools(void) { - int i, ret = 0; + int i, ret; ssize_t len; struct dentry *dentry = NULL; struct dentry *dir = bool_dir; @@ -951,67 +1237,75 @@ 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; - sel_remove_bools(dir); + sel_remove_entries(dir); - if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) - return -ENOMEM; + ret = -ENOMEM; + page = (char *)get_zeroed_page(GFP_KERNEL); + if (!page) + goto out; ret = security_get_bools(&num, &names, &values); - if (ret != 0) + if (ret) goto out; for (i = 0; i < num; i++) { + ret = -ENOMEM; dentry = d_alloc_name(dir, names[i]); - if (!dentry) { - ret = -ENOMEM; - goto err; - } + if (!dentry) + goto out; + + ret = -ENOMEM; inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); - if (!inode) { - ret = -ENOMEM; - goto err; - } + if (!inode) + goto out; + ret = -ENAMETOOLONG; len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); - if (len < 0) { - ret = -EINVAL; - goto err; - } else if (len >= PAGE_SIZE) { - ret = -ENAMETOOLONG; - goto err; - } - isec = (struct inode_security_struct*)inode->i_security; - if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid))) - goto err; + if (len >= PAGE_SIZE) + goto out; + + isec = (struct inode_security_struct *)inode->i_security; + ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); + if (ret) + goto out; + isec->sid = sid; isec->initialized = 1; inode->i_fop = &sel_bool_ops; - inode->i_ino = i + BOOL_INO_OFFSET; + inode->i_ino = i|SEL_BOOL_INO_OFFSET; d_add(dentry, inode); } bool_num = num; + bool_pending_names = names; bool_pending_values = values; + + free_page((unsigned long)page); + return 0; out: free_page((unsigned long)page); + if (names) { for (i = 0; i < num; i++) kfree(names[i]); kfree(names); } - return ret; -err: kfree(values); - d_genocide(dir); - ret = -ENOMEM; - goto out; + sel_remove_entries(dir); + + return ret; } #define NULL_FILE_NAME "null" -struct dentry *selinux_null = 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) @@ -1023,52 +1317,46 @@ static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, 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, +static ssize_t sel_write_avc_cache_threshold(struct file *file, + const char __user *buf, size_t count, loff_t *ppos) { - char *page; + char *page = NULL; ssize_t ret; int new_value; - if (count < 0 || count >= PAGE_SIZE) { - ret = -ENOMEM; + ret = task_has_security(current, SECURITY__SETSECPARAM); + if (ret) goto out; - } - if (*ppos != 0) { - /* No partial writes. */ - ret = -EINVAL; + ret = -ENOMEM; + if (count >= PAGE_SIZE) goto out; - } - page = (char*)get_zeroed_page(GFP_KERNEL); - if (!page) { - ret = -ENOMEM; + /* No partial writes. */ + ret = -EINVAL; + if (*ppos != 0) goto out; - } - if (copy_from_user(page, buf, count)) { - ret = -EFAULT; - goto out_free; - } + ret = -ENOMEM; + page = (char *)get_zeroed_page(GFP_KERNEL); + if (!page) + goto out; - if (sscanf(page, "%u", &new_value) != 1) { - ret = -EINVAL; + ret = -EFAULT; + if (copy_from_user(page, buf, count)) goto out; - } - if (new_value != avc_cache_threshold) { - ret = task_has_security(current, SECURITY__SETSECPARAM); - if (ret) - goto out_free; - avc_cache_threshold = new_value; - } + ret = -EINVAL; + if (sscanf(page, "%u", &new_value) != 1) + goto out; + + avc_cache_threshold = new_value; + ret = count; -out_free: - free_page((unsigned long)page); out: + free_page((unsigned long)page); return ret; } @@ -1076,28 +1364,29 @@ static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { char *page; - ssize_t ret = 0; + ssize_t length; page = (char *)__get_free_page(GFP_KERNEL); - if (!page) { - ret = -ENOMEM; - goto out; - } - ret = avc_get_hash_stats(page); - if (ret >= 0) - ret = simple_read_from_buffer(buf, count, ppos, page, ret); + 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); -out: - return ret; + + return length; } -static struct file_operations sel_avc_cache_threshold_ops = { +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 struct file_operations sel_avc_hash_stats_ops = { +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 @@ -1105,7 +1394,7 @@ static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) { int cpu; - for (cpu = *idx; cpu < NR_CPUS; ++cpu) { + for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { if (!cpu_possible(cpu)) continue; *idx = cpu + 1; @@ -1136,17 +1425,21 @@ static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) if (v == SEQ_START_TOKEN) seq_printf(seq, "lookups hits misses allocations reclaims " "frees\n"); - else - seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups, - st->hits, st->misses, st->allocations, + 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 struct seq_operations sel_avc_cache_stats_seq_ops = { +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, @@ -1158,7 +1451,7 @@ static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) return seq_open(file, &sel_avc_cache_stats_seq_ops); } -static struct file_operations sel_avc_cache_stats_ops = { +static const struct file_operations sel_avc_cache_stats_ops = { .open = sel_open_avc_cache_stats, .read = seq_read, .llseek = seq_lseek, @@ -1168,7 +1461,7 @@ static struct file_operations sel_avc_cache_stats_ops = { static int sel_make_avc_files(struct dentry *dir) { - int i, ret = 0; + int i; static struct tree_descr files[] = { { "cache_threshold", &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, @@ -1178,49 +1471,324 @@ static int sel_make_avc_files(struct dentry *dir) #endif }; - for (i = 0; i < sizeof (files) / sizeof (files[0]); i++) { + for (i = 0; i < ARRAY_SIZE(files); i++) { struct inode *inode; struct dentry *dentry; dentry = d_alloc_name(dir, files[i].name); - if (!dentry) { - ret = -ENOMEM; - goto err; - } + if (!dentry) + return -ENOMEM; inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); - if (!inode) { - ret = -ENOMEM; - goto err; - } + if (!inode) + return -ENOMEM; + inode->i_fop = files[i].ops; + inode->i_ino = ++sel_last_ino; d_add(dentry, inode); } -out: + + 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; -err: - d_genocide(dir); - goto out; } -static int sel_make_dir(struct super_block *sb, struct dentry *dentry) +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) +{ + int i; + + for (i = 1; i <= SECINITSID_NUM; i++) { + struct inode *inode; + struct dentry *dentry; + dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); + if (!dentry) + return -ENOMEM; + + inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); + if (!inode) + 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 = snprintf(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 = snprintf(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(char *objclass, int classvalue, + struct dentry *dir) +{ + int i, rc, nperms; + char **perms; + + rc = security_get_permissions(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) + 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(char *classname, int index, + struct dentry *dir) +{ + struct dentry *dentry = NULL; + struct inode *inode = NULL; + int rc; + + dentry = d_alloc_name(dir, "index"); + if (!dentry) + return -ENOMEM; + + inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); + if (!inode) + 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", &last_class_ino); + if (IS_ERR(dentry)) + return PTR_ERR(dentry); + + rc = sel_make_perm_files(classname, index, dentry); + + return rc; +} + +static void sel_remove_classes(void) +{ + struct list_head *class_node; + + list_for_each(class_node, &class_dir->d_subdirs) { + struct dentry *class_subdir = list_entry(class_node, + struct dentry, d_u.d_child); + struct list_head *class_subdir_node; + + list_for_each(class_subdir_node, &class_subdir->d_subdirs) { + struct dentry *d = list_entry(class_subdir_node, + struct dentry, d_u.d_child); + + if (d->d_inode) + if (d->d_inode->i_mode & S_IFDIR) + sel_remove_entries(d); + } + + sel_remove_entries(class_subdir); + } + + sel_remove_entries(class_dir); +} + +static int sel_make_classes(void) +{ + int rc, nclasses, i; + char **classes; + + /* delete any existing entries */ + sel_remove_classes(); + + rc = security_get_classes(&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(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(void) +{ + unsigned int iter; + struct dentry *dentry = NULL; + struct inode *inode = NULL; + + sel_remove_entries(policycap_dir); + + for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { + if (iter < ARRAY_SIZE(policycap_names)) + dentry = d_alloc_name(policycap_dir, + policycap_names[iter]); + else + dentry = d_alloc_name(policycap_dir, "unknown"); + + if (dentry == NULL) + return -ENOMEM; + + inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); + if (inode == NULL) + 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) { - int ret = 0; + struct dentry *dentry = d_alloc_name(dir, name); struct inode *inode; - inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); + if (!dentry) + return ERR_PTR(-ENOMEM); + + inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO); if (!inode) { - ret = -ENOMEM; - goto out; + 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); -out: - return ret; + /* bump link count on parent directory, too */ + inc_nlink(dir->d_inode); + + return dentry; } -static int sel_fill_super(struct super_block * sb, void * data, int silent) +static int sel_fill_super(struct super_block *sb, void *data, int silent) { int ret; struct dentry *dentry; @@ -1230,7 +1798,7 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent) static 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", &sel_context_ops, S_IRUGO|S_IWUGO}, + [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}, @@ -1241,75 +1809,97 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent) [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}, /* last one */ {""} }; ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); if (ret) - return ret; - - dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); - if (!dentry) - return -ENOMEM; + goto err; - inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); - if (!inode) - goto out; - inode->i_op = &simple_dir_inode_operations; - inode->i_fop = &simple_dir_operations; - d_add(dentry, inode); - bool_dir = dentry; - ret = sel_make_bools(); - if (ret) - goto out; + 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; + goto err; + } + ret = -ENOMEM; dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); if (!dentry) - return -ENOMEM; + goto err; + ret = -ENOMEM; inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); if (!inode) - goto out; - isec = (struct inode_security_struct*)inode->i_security; + goto err; + + inode->i_ino = ++sel_last_ino; + isec = (struct inode_security_struct *)inode->i_security; isec->sid = SECINITSID_DEVNULL; isec->sclass = SECCLASS_CHR_FILE; isec->initialized = 1; init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); d_add(dentry, inode); - selinux_null = dentry; + selinux_null.dentry = dentry; - dentry = d_alloc_name(sb->s_root, "avc"); - if (!dentry) - return -ENOMEM; + dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino); + if (IS_ERR(dentry)) { + ret = PTR_ERR(dentry); + goto err; + } - ret = sel_make_dir(sb, dentry); + ret = sel_make_avc_files(dentry); if (ret) - goto out; + goto err; - ret = sel_make_avc_files(dentry); + dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino); + if (IS_ERR(dentry)) { + ret = PTR_ERR(dentry); + goto err; + } + + ret = sel_make_initcon_files(dentry); if (ret) - goto out; + 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; + 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; + goto err; + } return 0; -out: - dput(dentry); - printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__); - return -ENOMEM; +err: + printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", + __func__); + return ret; } -static struct super_block *sel_get_sb(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data) +static struct dentry *sel_mount(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) { - return get_sb_single(fs_type, flags, data, sel_fill_super); + return mount_single(fs_type, flags, data, sel_fill_super); } static struct file_system_type sel_fs_type = { .name = "selinuxfs", - .get_sb = sel_get_sb, + .mount = sel_mount, .kill_sb = kill_litter_super, }; struct vfsmount *selinuxfs_mount; +static struct kobject *selinuxfs_kobj; static int __init init_sel_fs(void) { @@ -1317,15 +1907,24 @@ static int __init init_sel_fs(void) if (!selinux_enabled) return 0; + + selinuxfs_kobj = kobject_create_and_add("selinux", fs_kobj); + if (!selinuxfs_kobj) + return -ENOMEM; + err = register_filesystem(&sel_fs_type); - if (!err) { - selinuxfs_mount = kern_mount(&sel_fs_type); - if (IS_ERR(selinuxfs_mount)) { - printk(KERN_ERR "selinuxfs: could not mount!\n"); - err = PTR_ERR(selinuxfs_mount); - selinuxfs_mount = NULL; - } + if (err) { + kobject_put(selinuxfs_kobj); + return err; + } + + selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type); + if (IS_ERR(selinuxfs_mount)) { + printk(KERN_ERR "selinuxfs: could not mount!\n"); + err = PTR_ERR(selinuxfs_mount); + selinuxfs_mount = NULL; } + return err; } @@ -1334,6 +1933,8 @@ __initcall(init_sel_fs); #ifdef CONFIG_SECURITY_SELINUX_DISABLE void exit_sel_fs(void) { + kobject_put(selinuxfs_kobj); + kern_unmount(selinuxfs_mount); unregister_filesystem(&sel_fs_type); } #endif |