diff options
Diffstat (limited to 'security/selinux/selinuxfs.c')
| -rw-r--r-- | security/selinux/selinuxfs.c | 885 |
1 files changed, 437 insertions, 448 deletions
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index 073fd5b0a53..c71737f6d1c 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -2,7 +2,7 @@ * * Added conditional policy language extensions * - * Updated: Hewlett-Packard <paul.moore@hp.com> + * Updated: Hewlett-Packard <paul@paul-moore.com> * * Added support for the policy capability bitmap * @@ -28,6 +28,8 @@ #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. */ @@ -42,7 +44,9 @@ /* Policy capability filenames */ static char *policycap_names[] = { "network_peer_controls", - "open_perms" + "open_perms", + "redhat1", + "always_check_network" }; unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; @@ -50,7 +54,7 @@ unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; static int __init checkreqprot_setup(char *str) { unsigned long checkreqprot; - if (!strict_strtoul(str, 0, &checkreqprot)) + if (!kstrtoul(str, 0, &checkreqprot)) selinux_checkreqprot = checkreqprot ? 1 : 0; return 1; } @@ -73,8 +77,6 @@ static char policy_opened; /* global data for policy capabilities */ static struct dentry *policycap_dir; -extern void selnl_notify_setenforce(int val); - /* Check whether a task is allowed to use a security operation. */ static int task_has_security(struct task_struct *tsk, u32 perms) @@ -141,19 +143,24 @@ 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; + length = -ENOMEM; if (count >= PAGE_SIZE) - return -ENOMEM; - if (*ppos != 0) { - /* No partial writes. */ - return -EINVAL; - } + 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; @@ -169,7 +176,7 @@ static ssize_t sel_write_enforce(struct file *file, const char __user *buf, audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, "enforcing=%d old_enforcing=%d auid=%u ses=%u", new_value, selinux_enforcing, - audit_get_loginuid(current), + from_kuid(&init_user_ns, audit_get_loginuid(current)), audit_get_sessionid(current)); selinux_enforcing = new_value; if (selinux_enforcing) @@ -197,7 +204,7 @@ static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, { char tmpbuf[TMPBUFLEN]; ssize_t length; - ino_t ino = filp->f_path.dentry->d_inode->i_ino; + ino_t ino = file_inode(filp)->i_ino; int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? security_get_reject_unknown() : !security_get_allow_unknown(); @@ -268,20 +275,24 @@ 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); + length = -ENOMEM; if (count >= PAGE_SIZE) - return -ENOMEM; - if (*ppos != 0) { - /* No partial writes. */ - return -EINVAL; - } + 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; @@ -292,11 +303,11 @@ 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", - audit_get_loginuid(current), + from_kuid(&init_user_ns, audit_get_loginuid(current)), audit_get_sessionid(current)); } @@ -335,7 +346,7 @@ static int sel_make_classes(void); static int sel_make_policycap(void); /* declaration for sel_make_class_dirs */ -static int sel_make_dir(struct inode *dir, struct dentry *dentry, +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, @@ -466,7 +477,7 @@ static struct vm_operations_struct sel_mmap_policy_ops = { .page_mkwrite = sel_mmap_policy_fault, }; -int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) +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 */ @@ -476,7 +487,7 @@ int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) return -EACCES; } - vma->vm_flags |= VM_RESERVED; + vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; vma->vm_ops = &sel_mmap_policy_ops; return 0; @@ -487,13 +498,13 @@ static const struct file_operations sel_policy_ops = { .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) { - int ret; ssize_t length; void *data = NULL; @@ -503,17 +514,19 @@ static ssize_t sel_write_load(struct file *file, const char __user *buf, if (length) goto out; - if (*ppos != 0) { - /* No partial writes. */ - length = -EINVAL; + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) goto out; - } - if ((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) @@ -523,28 +536,24 @@ 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; + length = sel_make_bools(); + if (length) goto out1; - } - ret = sel_make_classes(); - if (ret) { - length = ret; + length = sel_make_classes(); + if (length) goto out1; - } - ret = sel_make_policycap(); - if (ret) - length = ret; - else - length = count; + 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", - audit_get_loginuid(current), + from_kuid(&init_user_ns, audit_get_loginuid(current)), audit_get_sessionid(current)); out: mutex_unlock(&sel_mutex); @@ -559,26 +568,26 @@ static const struct file_operations sel_load_ops = { static ssize_t sel_write_context(struct file *file, char *buf, size_t size) { - char *canon; + char *canon = NULL; u32 sid, len; ssize_t length; length = task_has_security(current, SECURITY__CHECK_CONTEXT); if (length) - return length; + goto out; - length = security_context_to_sid(buf, size, &sid); - if (length < 0) - return length; + length = security_context_to_sid(buf, size, &sid, GFP_KERNEL); + if (length) + goto out; length = security_sid_to_context(sid, &canon, &len); - if (length < 0) - return length; + if (length) + goto out; + length = -ERANGE; if (len > SIMPLE_TRANSACTION_LIMIT) { printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " "payload max\n", __func__, len); - length = -ERANGE; goto out; } @@ -602,23 +611,28 @@ static ssize_t sel_read_checkreqprot(struct file *filp, 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; + length = -ENOMEM; if (count >= PAGE_SIZE) - return -ENOMEM; - if (*ppos != 0) { - /* No partial writes. */ - return -EINVAL; - } + 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; @@ -659,7 +673,7 @@ static ssize_t (*write_op[])(struct file *, char *, size_t) = { static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) { - ino_t ino = file->f_path.dentry->d_inode->i_ino; + ino_t ino = file_inode(file)->i_ino; char *data; ssize_t rv; @@ -693,7 +707,7 @@ static const struct file_operations transaction_ops = { 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; struct av_decision avd; @@ -701,27 +715,31 @@ static ssize_t sel_write_access(struct file *file, char *buf, size_t size) length = task_has_security(current, SECURITY__COMPUTE_AV); if (length) - return length; + goto out; length = -ENOMEM; scon = kzalloc(size + 1, GFP_KERNEL); if (!scon) - return length; + 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 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; security_compute_av_user(ssid, tsid, tclass, &avd); @@ -730,133 +748,175 @@ static ssize_t sel_write_access(struct file *file, char *buf, size_t size) avd.allowed, 0xffffffff, avd.auditallow, avd.auditdeny, avd.seqno, avd.flags); -out2: - kfree(tcon); out: + kfree(tcon); kfree(scon); return length; } 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 = kzalloc(size + 1, GFP_KERNEL); if (!scon) - return length; + 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; - 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_user(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 "SELinux: %s: context size (%u) exceeds " "payload max\n", __func__, len); - length = -ERANGE; - goto out3; + 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) { - 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 = kzalloc(size + 1, GFP_KERNEL); if (!scon) - return length; + 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 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_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) { - 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; @@ -864,28 +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 = kzalloc(size + 1, GFP_KERNEL); if (!con) - return length; + 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 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; @@ -893,82 +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) { - 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 = kzalloc(size + 1, GFP_KERNEL); if (!scon) - return length; + 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 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 "SELinux: %s: context size (%u) exceeds " "payload max\n", __func__, len); - length = -ERANGE; - goto out3; + goto out; } memcpy(buf, newcon, len); length = len; -out3: +out: kfree(newcon); -out2: kfree(tcon); -out: kfree(scon); return length; } @@ -978,7 +1039,6 @@ static struct inode *sel_make_inode(struct super_block *sb, int mode) struct inode *ret = new_inode(sb); if (ret) { - ret->i_ino = get_next_ino(); ret->i_mode = mode; ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; } @@ -992,22 +1052,19 @@ static ssize_t sel_read_bool(struct file *filep, char __user *buf, ssize_t length; ssize_t ret; int cur_enforcing; - struct inode *inode = filep->f_path.dentry->d_inode; - unsigned index = inode->i_ino & SEL_INO_MASK; + unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; const char *name = filep->f_path.dentry->d_name.name; mutex_lock(&sel_mutex); - if (index >= bool_num || strcmp(name, bool_pending_names[index])) { - ret = -EINVAL; + ret = -EINVAL; + if (index >= bool_num || strcmp(name, bool_pending_names[index])) goto out; - } + ret = -ENOMEM; page = (char *)get_zeroed_page(GFP_KERNEL); - if (!page) { - ret = -ENOMEM; + if (!page) goto out; - } cur_enforcing = security_get_bool_value(index); if (cur_enforcing < 0) { @@ -1019,8 +1076,7 @@ static ssize_t sel_read_bool(struct file *filep, char __user *buf, ret = simple_read_from_buffer(buf, count, ppos, page, length); out: mutex_unlock(&sel_mutex); - if (page) - free_page((unsigned long)page); + free_page((unsigned long)page); return ret; } @@ -1030,8 +1086,7 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf, char *page = NULL; ssize_t length; int new_value; - struct inode *inode = filep->f_path.dentry->d_inode; - unsigned index = inode->i_ino & SEL_INO_MASK; + unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; const char *name = filep->f_path.dentry->d_name.name; mutex_lock(&sel_mutex); @@ -1040,26 +1095,23 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf, if (length) goto out; - if (index >= bool_num || strcmp(name, bool_pending_names[index])) { - length = -EINVAL; + length = -EINVAL; + if (index >= bool_num || strcmp(name, bool_pending_names[index])) goto out; - } - if (count >= PAGE_SIZE) { - length = -ENOMEM; + length = -ENOMEM; + if (count >= PAGE_SIZE) goto out; - } - if (*ppos != 0) { - /* No partial writes. */ - length = -EINVAL; + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) goto out; - } + + length = -ENOMEM; page = (char *)get_zeroed_page(GFP_KERNEL); - if (!page) { - length = -ENOMEM; + if (!page) goto out; - } length = -EFAULT; if (copy_from_user(page, buf, count)) @@ -1077,8 +1129,7 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf, out: mutex_unlock(&sel_mutex); - if (page) - free_page((unsigned long) page); + free_page((unsigned long) page); return length; } @@ -1102,19 +1153,19 @@ static ssize_t sel_commit_bools_write(struct file *filep, if (length) goto out; - if (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; - } + + length = -ENOMEM; page = (char *)get_zeroed_page(GFP_KERNEL); - if (!page) { - length = -ENOMEM; + if (!page) goto out; - } length = -EFAULT; if (copy_from_user(page, buf, count)) @@ -1124,15 +1175,16 @@ static ssize_t sel_commit_bools_write(struct file *filep, if (sscanf(page, "%d", &new_value) != 1) goto out; + length = 0; if (new_value && bool_pending_values) - security_set_bools(bool_num, bool_pending_values); + length = security_set_bools(bool_num, bool_pending_values); - length = count; + if (!length) + length = count; out: mutex_unlock(&sel_mutex); - if (page) - free_page((unsigned long) page); + free_page((unsigned long) page); return length; } @@ -1145,31 +1197,35 @@ static void sel_remove_entries(struct dentry *de) { 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_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); + 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; @@ -1185,43 +1241,42 @@ static int sel_make_bools(void) 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_entries(dir); + ret = -ENOMEM; page = (char *)get_zeroed_page(GFP_KERNEL); if (!page) - return -ENOMEM; + 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; - } + 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 err; + goto out; + isec->sid = sid; isec->initialized = 1; inode->i_fop = &sel_bool_ops; @@ -1231,10 +1286,12 @@ static int sel_make_bools(void) bool_num = num; bool_pending_names = names; bool_pending_values = values; + + free_page((unsigned long)page); + return 0; out: free_page((unsigned long)page); - return ret; -err: + if (names) { for (i = 0; i < num; i++) kfree(names[i]); @@ -1242,13 +1299,13 @@ err: } kfree(values); sel_remove_entries(dir); - ret = -ENOMEM; - goto out; + + return ret; } #define NULL_FILE_NAME "null" -struct dentry *selinux_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) @@ -1265,47 +1322,41 @@ static ssize_t sel_write_avc_cache_threshold(struct file *file, size_t count, loff_t *ppos) { - char *page; + char *page = NULL; ssize_t ret; int new_value; - if (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; - } + /* No partial writes. */ + ret = -EINVAL; + if (*ppos != 0) + goto out; + + ret = -ENOMEM; page = (char *)get_zeroed_page(GFP_KERNEL); - if (!page) { - ret = -ENOMEM; + if (!page) goto out; - } - if (copy_from_user(page, buf, count)) { - ret = -EFAULT; - goto out_free; - } + ret = -EFAULT; + if (copy_from_user(page, buf, count)) + goto out; - if (sscanf(page, "%u", &new_value) != 1) { - ret = -EINVAL; + ret = -EINVAL; + if (sscanf(page, "%u", &new_value) != 1) 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; - } + avc_cache_threshold = new_value; + ret = count; -out_free: - free_page((unsigned long)page); out: + free_page((unsigned long)page); return ret; } @@ -1313,19 +1364,18 @@ 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 const struct file_operations sel_avc_cache_threshold_ops = { @@ -1375,10 +1425,14 @@ 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; } @@ -1407,7 +1461,7 @@ static const 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 }, @@ -1422,36 +1476,31 @@ static int sel_make_avc_files(struct dentry *dir) struct dentry *dentry; dentry = d_alloc_name(dir, files[i].name); - if (!dentry) { - ret = -ENOMEM; - goto out; - } + if (!dentry) + return -ENOMEM; inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); - if (!inode) { - ret = -ENOMEM; - goto out; - } + if (!inode) + return -ENOMEM; + inode->i_fop = files[i].ops; inode->i_ino = ++sel_last_ino; d_add(dentry, inode); } -out: - return ret; + + return 0; } static ssize_t sel_read_initcon(struct file *file, char __user *buf, size_t count, loff_t *ppos) { - struct inode *inode; char *con; u32 sid, len; ssize_t ret; - inode = file->f_path.dentry->d_inode; - sid = inode->i_ino&SEL_INO_MASK; + sid = file_inode(file)->i_ino&SEL_INO_MASK; ret = security_sid_to_context(sid, &con, &len); - if (ret < 0) + if (ret) return ret; ret = simple_read_from_buffer(buf, count, ppos, con, len); @@ -1466,33 +1515,25 @@ static const struct file_operations sel_initcon_ops = { static int sel_make_initcon_files(struct dentry *dir) { - int i, ret = 0; + 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) { - ret = -ENOMEM; - goto out; - } + if (!dentry) + return -ENOMEM; inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); - if (!inode) { - ret = -ENOMEM; - goto out; - } + if (!inode) + return -ENOMEM; + inode->i_fop = &sel_initcon_ops; inode->i_ino = i|SEL_INITCON_INO_OFFSET; d_add(dentry, inode); } -out: - return ret; -} -static inline unsigned int sel_div(unsigned long a, unsigned long b) -{ - return a / b - (a % b < 0); + return 0; } static inline unsigned long sel_class_to_ino(u16 class) @@ -1502,7 +1543,7 @@ static inline unsigned long sel_class_to_ino(u16 class) static inline u16 sel_ino_to_class(unsigned long ino) { - return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1); + return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1); } static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) @@ -1518,21 +1559,10 @@ static inline u32 sel_ino_to_perm(unsigned long ino) static ssize_t sel_read_class(struct file *file, char __user *buf, size_t count, loff_t *ppos) { - ssize_t rc, len; - char *page; - unsigned long ino = file->f_path.dentry->d_inode->i_ino; - - page = (char *)__get_free_page(GFP_KERNEL); - if (!page) { - rc = -ENOMEM; - goto out; - } - - len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino)); - rc = simple_read_from_buffer(buf, count, ppos, page, len); - free_page((unsigned long)page); -out: - return rc; + 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 = { @@ -1543,21 +1573,10 @@ static const struct file_operations sel_class_ops = { static ssize_t sel_read_perm(struct file *file, char __user *buf, size_t count, loff_t *ppos) { - ssize_t rc, len; - char *page; - unsigned long ino = file->f_path.dentry->d_inode->i_ino; - - page = (char *)__get_free_page(GFP_KERNEL); - if (!page) { - rc = -ENOMEM; - goto out; - } - - len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino)); - rc = simple_read_from_buffer(buf, count, ppos, page, len); - free_page((unsigned long)page); -out: - return rc; + 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 = { @@ -1571,7 +1590,7 @@ static ssize_t sel_read_policycap(struct file *file, char __user *buf, int value; char tmpbuf[TMPBUFLEN]; ssize_t length; - unsigned long i_ino = file->f_path.dentry->d_inode->i_ino; + unsigned long i_ino = file_inode(file)->i_ino; value = security_policycap_supported(i_ino & SEL_INO_MASK); length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); @@ -1587,39 +1606,37 @@ static const struct file_operations sel_policycap_ops = { static int sel_make_perm_files(char *objclass, int classvalue, struct dentry *dir) { - int i, rc = 0, nperms; + int i, rc, nperms; char **perms; rc = security_get_permissions(objclass, &perms, &nperms); if (rc) - goto out; + 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) { - rc = -ENOMEM; - goto out1; - } + if (!dentry) + goto out; + rc = -ENOMEM; inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); - if (!inode) { - rc = -ENOMEM; - goto out1; - } + 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); } - -out1: + rc = 0; +out: for (i = 0; i < nperms; i++) kfree(perms[i]); kfree(perms); -out: return rc; } @@ -1631,34 +1648,23 @@ static int sel_make_class_dir_entries(char *classname, int index, int rc; dentry = d_alloc_name(dir, "index"); - if (!dentry) { - rc = -ENOMEM; - goto out; - } + if (!dentry) + return -ENOMEM; inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); - if (!inode) { - rc = -ENOMEM; - goto out; - } + if (!inode) + return -ENOMEM; inode->i_fop = &sel_class_ops; inode->i_ino = sel_class_to_ino(index); d_add(dentry, inode); - dentry = d_alloc_name(dir, "perms"); - if (!dentry) { - rc = -ENOMEM; - goto out; - } - - rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino); - if (rc) - goto out; + 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); -out: return rc; } @@ -1688,15 +1694,15 @@ static void sel_remove_classes(void) static int sel_make_classes(void) { - int rc = 0, nclasses, i; + int rc, nclasses, i; char **classes; /* delete any existing entries */ sel_remove_classes(); rc = security_get_classes(&classes, &nclasses); - if (rc < 0) - goto out; + if (rc) + return rc; /* +2 since classes are 1-indexed */ last_class_ino = sel_class_to_ino(nclasses + 2); @@ -1704,29 +1710,24 @@ static int sel_make_classes(void) for (i = 0; i < nclasses; i++) { struct dentry *class_name_dir; - class_name_dir = d_alloc_name(class_dir, classes[i]); - if (!class_name_dir) { - rc = -ENOMEM; - goto out1; - } - - rc = sel_make_dir(class_dir->d_inode, class_name_dir, + class_name_dir = sel_make_dir(class_dir, classes[i], &last_class_ino); - if (rc) - goto out1; + 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 out1; + goto out; } - -out1: + rc = 0; +out: for (i = 0; i < nclasses; i++) kfree(classes[i]); kfree(classes); -out: return rc; } @@ -1760,17 +1761,21 @@ static int sel_make_policycap(void) return 0; } -static int sel_make_dir(struct inode *dir, struct dentry *dentry, +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(dir->i_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); @@ -1778,16 +1783,16 @@ static int sel_make_dir(struct inode *dir, struct dentry *dentry, inc_nlink(inode); d_add(dentry, inode); /* bump link count on parent directory, too */ - inc_nlink(dir); -out: - return ret; + inc_nlink(dir->d_inode); + + return dentry; } static int sel_fill_super(struct super_block *sb, void *data, int silent) { int ret; struct dentry *dentry; - struct inode *inode, *root_inode; + struct inode *inode; struct inode_security_struct *isec; static struct tree_descr selinux_files[] = { @@ -1807,38 +1812,30 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent) [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_IRUSR}, + [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO}, /* last one */ {""} }; ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); if (ret) goto err; - root_inode = sb->s_root->d_inode; - - dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); - if (!dentry) { - ret = -ENOMEM; + 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 = sel_make_dir(root_inode, dentry, &sel_last_ino); - if (ret) - goto err; - - bool_dir = dentry; - + ret = -ENOMEM; dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); - if (!dentry) { - ret = -ENOMEM; + if (!dentry) goto err; - } + ret = -ENOMEM; inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); - if (!inode) { - ret = -ENOMEM; + if (!inode) goto err; - } + inode->i_ino = ++sel_last_ino; isec = (struct inode_security_struct *)inode->i_security; isec->sid = SECINITSID_DEVNULL; @@ -1847,66 +1844,46 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent) init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); d_add(dentry, inode); - selinux_null = dentry; + selinux_null.dentry = dentry; - dentry = d_alloc_name(sb->s_root, "avc"); - if (!dentry) { - ret = -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(root_inode, dentry, &sel_last_ino); - if (ret) - goto err; - ret = sel_make_avc_files(dentry); if (ret) goto err; - dentry = d_alloc_name(sb->s_root, "initial_contexts"); - if (!dentry) { - ret = -ENOMEM; + 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_dir(root_inode, dentry, &sel_last_ino); - if (ret) - goto err; - ret = sel_make_initcon_files(dentry); if (ret) goto err; - dentry = d_alloc_name(sb->s_root, "class"); - if (!dentry) { - ret = -ENOMEM; + 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; } - ret = sel_make_dir(root_inode, dentry, &sel_last_ino); - if (ret) - goto err; - - class_dir = dentry; - - dentry = d_alloc_name(sb->s_root, "policy_capabilities"); - if (!dentry) { - ret = -ENOMEM; + 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; } - - ret = sel_make_dir(root_inode, dentry, &sel_last_ino); - if (ret) - goto err; - - policycap_dir = dentry; - -out: - return ret; + return 0; err: printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", __func__); - goto out; + return ret; } static struct dentry *sel_mount(struct file_system_type *fs_type, @@ -1922,6 +1899,7 @@ static struct file_system_type sel_fs_type = { }; struct vfsmount *selinuxfs_mount; +static struct kobject *selinuxfs_kobj; static int __init init_sel_fs(void) { @@ -1929,15 +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; } @@ -1946,6 +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 |