1 files changed, 188 insertions, 162 deletions

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index c178494850a9..6475e1f0223e 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -24,9 +24,11 @@
  */
 
 #include <linux/init.h>
+#include <linux/kd.h>
 #include <linux/kernel.h>
 #include <linux/tracehook.h>
 #include <linux/errno.h>
+#include <linux/ext2_fs.h>
 #include <linux/sched.h>
 #include <linux/security.h>
 #include <linux/xattr.h>
@@ -36,14 +38,15 @@
 #include <linux/mman.h>
 #include <linux/slab.h>
 #include <linux/pagemap.h>
+#include <linux/proc_fs.h>
 #include <linux/swap.h>
 #include <linux/spinlock.h>
 #include <linux/syscalls.h>
+#include <linux/dcache.h>
 #include <linux/file.h>
 #include <linux/fdtable.h>
 #include <linux/namei.h>
 #include <linux/mount.h>
-#include <linux/proc_fs.h>
 #include <linux/netfilter_ipv4.h>
 #include <linux/netfilter_ipv6.h>
 #include <linux/tty.h>
@@ -70,7 +73,6 @@
 #include <net/ipv6.h>
 #include <linux/hugetlb.h>
 #include <linux/personality.h>
-#include <linux/sysctl.h>
 #include <linux/audit.h>
 #include <linux/string.h>
 #include <linux/selinux.h>
@@ -1120,39 +1122,35 @@ static inline u16 socket_type_to_security_class(int family, int type, int protoc
 }
 
 #ifdef CONFIG_PROC_FS
-static int selinux_proc_get_sid(struct proc_dir_entry *de,
+static int selinux_proc_get_sid(struct dentry *dentry,
                                 u16 tclass,
                                 u32 *sid)
 {
-        int buflen, rc;
-        char *buffer, *path, *end;
+        int rc;
+        char *buffer, *path;
 
         buffer = (char *)__get_free_page(GFP_KERNEL);
         if (!buffer)
                 return -ENOMEM;
 
-        buflen = PAGE_SIZE;
-        end = buffer+buflen;
-        *--end = '\0';
-        buflen--;
-        path = end-1;
-        *path = '/';
-        while (de && de != de->parent) {
-                buflen -= de->namelen + 1;
-                if (buflen < 0)
-                        break;
-                end -= de->namelen;
-                memcpy(end, de->name, de->namelen);
-                *--end = '/';
-                path = end;
-                de = de->parent;
+        path = dentry_path_raw(dentry, buffer, PAGE_SIZE);
+        if (IS_ERR(path))
+                rc = PTR_ERR(path);
+        else {
+                /* each process gets a /proc/PID/ entry. Strip off the
+                 * PID part to get a valid selinux labeling.
+                 * e.g. /proc/1/net/rpc/nfs -> /net/rpc/nfs */
+                while (path[1] >= '0' && path[1] <= '9') {
+                        path[1] = '/';
+                        path++;
+                }
+                rc = security_genfs_sid("proc", path, tclass, sid);
         }
-        rc = security_genfs_sid("proc", path, tclass, sid);
         free_page((unsigned long)buffer);
         return rc;
 }
 #else
-static int selinux_proc_get_sid(struct proc_dir_entry *de,
+static int selinux_proc_get_sid(struct dentry *dentry,
                                 u16 tclass,
                                 u32 *sid)
 {
@@ -1300,10 +1298,8 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
 
                 /* Try to obtain a transition SID. */
                 isec->sclass = inode_mode_to_security_class(inode->i_mode);
-                rc = security_transition_sid(isec->task_sid,
-                                             sbsec->sid,
-                                             isec->sclass,
-                                             &sid);
+                rc = security_transition_sid(isec->task_sid, sbsec->sid,
+                                             isec->sclass, NULL, &sid);
                 if (rc)
                         goto out_unlock;
                 isec->sid = sid;
@@ -1316,10 +1312,9 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
                 isec->sid = sbsec->sid;
 
                 if ((sbsec->flags & SE_SBPROC) && !S_ISLNK(inode->i_mode)) {
-                        struct proc_inode *proci = PROC_I(inode);
-                        if (proci->pde) {
+                        if (opt_dentry) {
                                 isec->sclass = inode_mode_to_security_class(inode->i_mode);
-                                rc = selinux_proc_get_sid(proci->pde,
+                                rc = selinux_proc_get_sid(opt_dentry,
                                                           isec->sclass,
                                                           &sid);
                                 if (rc)
@@ -1578,7 +1573,7 @@ static int may_create(struct inode *dir,
                 return rc;
 
         if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) {
-                rc = security_transition_sid(sid, dsec->sid, tclass, &newsid);
+                rc = security_transition_sid(sid, dsec->sid, tclass, NULL, &newsid);
                 if (rc)
                         return rc;
         }
@@ -1862,82 +1857,6 @@ static int selinux_capable(struct task_struct *tsk, const struct cred *cred,
         return task_has_capability(tsk, cred, cap, audit);
 }
 
-static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid)
-{
-        int buflen, rc;
-        char *buffer, *path, *end;
-
-        rc = -ENOMEM;
-        buffer = (char *)__get_free_page(GFP_KERNEL);
-        if (!buffer)
-                goto out;
-
-        buflen = PAGE_SIZE;
-        end = buffer+buflen;
-        *--end = '\0';
-        buflen--;
-        path = end-1;
-        *path = '/';
-        while (table) {
-                const char *name = table->procname;
-                size_t namelen = strlen(name);
-                buflen -= namelen + 1;
-                if (buflen < 0)
-                        goto out_free;
-                end -= namelen;
-                memcpy(end, name, namelen);
-                *--end = '/';
-                path = end;
-                table = table->parent;
-        }
-        buflen -= 4;
-        if (buflen < 0)
-                goto out_free;
-        end -= 4;
-        memcpy(end, "/sys", 4);
-        path = end;
-        rc = security_genfs_sid("proc", path, tclass, sid);
-out_free:
-        free_page((unsigned long)buffer);
-out:
-        return rc;
-}
-
-static int selinux_sysctl(ctl_table *table, int op)
-{
-        int error = 0;
-        u32 av;
-        u32 tsid, sid;
-        int rc;
-
-        sid = current_sid();
-
-        rc = selinux_sysctl_get_sid(table, (op == 0001) ?
-                                    SECCLASS_DIR : SECCLASS_FILE, &tsid);
-        if (rc) {
-                /* Default to the well-defined sysctl SID. */
-                tsid = SECINITSID_SYSCTL;
-        }
-
-        /* The op values are "defined" in sysctl.c, thereby creating
-         * a bad coupling between this module and sysctl.c */
-        if (op == 001) {
-                error = avc_has_perm(sid, tsid,
-                                     SECCLASS_DIR, DIR__SEARCH, NULL);
-        } else {
-                av = 0;
-                if (op & 004)
-                        av |= FILE__READ;
-                if (op & 002)
-                        av |= FILE__WRITE;
-                if (av)
-                        error = avc_has_perm(sid, tsid,
-                                             SECCLASS_FILE, av, NULL);
-        }
-
-        return error;
-}
-
 static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
 {
         const struct cred *cred = current_cred();
@@ -2060,7 +1979,8 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm)
         } else {
                 /* Check for a default transition on this program. */
                 rc = security_transition_sid(old_tsec->sid, isec->sid,
-                                             SECCLASS_PROCESS, &new_tsec->sid);
+                                             SECCLASS_PROCESS, NULL,
+                                             &new_tsec->sid);
                 if (rc)
                         return rc;
         }
@@ -2443,6 +2363,91 @@ out:
         return rc;
 }
 
+static int selinux_sb_remount(struct super_block *sb, void *data)
+{
+        int rc, i, *flags;
+        struct security_mnt_opts opts;
+        char *secdata, **mount_options;
+        struct superblock_security_struct *sbsec = sb->s_security;
+
+        if (!(sbsec->flags & SE_SBINITIALIZED))
+                return 0;
+
+        if (!data)
+                return 0;
+
+        if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA)
+                return 0;
+
+        security_init_mnt_opts(&opts);
+        secdata = alloc_secdata();
+        if (!secdata)
+                return -ENOMEM;
+        rc = selinux_sb_copy_data(data, secdata);
+        if (rc)
+                goto out_free_secdata;
+
+        rc = selinux_parse_opts_str(secdata, &opts);
+        if (rc)
+                goto out_free_secdata;
+
+        mount_options = opts.mnt_opts;
+        flags = opts.mnt_opts_flags;
+
+        for (i = 0; i < opts.num_mnt_opts; i++) {
+                u32 sid;
+                size_t len;
+
+                if (flags[i] == SE_SBLABELSUPP)
+                        continue;
+                len = strlen(mount_options[i]);
+                rc = security_context_to_sid(mount_options[i], len, &sid);
+                if (rc) {
+                        printk(KERN_WARNING "SELinux: security_context_to_sid"
+                               "(%s) failed for (dev %s, type %s) errno=%d\n",
+                               mount_options[i], sb->s_id, sb->s_type->name, rc);
+                        goto out_free_opts;
+                }
+                rc = -EINVAL;
+                switch (flags[i]) {
+                case FSCONTEXT_MNT:
+                        if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid))
+                                goto out_bad_option;
+                        break;
+                case CONTEXT_MNT:
+                        if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid))
+                                goto out_bad_option;
+                        break;
+                case ROOTCONTEXT_MNT: {
+                        struct inode_security_struct *root_isec;
+                        root_isec = sb->s_root->d_inode->i_security;
+
+                        if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid))
+                                goto out_bad_option;
+                        break;
+                }
+                case DEFCONTEXT_MNT:
+                        if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid))
+                                goto out_bad_option;
+                        break;
+                default:
+                        goto out_free_opts;
+                }
+        }
+
+        rc = 0;
+out_free_opts:
+        security_free_mnt_opts(&opts);
+out_free_secdata:
+        free_secdata(secdata);
+        return rc;
+out_bad_option:
+        printk(KERN_WARNING "SELinux: unable to change security options "
+               "during remount (dev %s, type=%s)\n", sb->s_id,
+               sb->s_type->name);
+        goto out_free_opts;
+}
+
 static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data)
 {
         const struct cred *cred = current_cred();
@@ -2509,8 +2514,8 @@ static void selinux_inode_free_security(struct inode *inode)
 }
 
 static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
-                                       char **name, void **value,
-                                       size_t *len)
+                                       const struct qstr *qstr, char **name,
+                                       void **value, size_t *len)
 {
         const struct task_security_struct *tsec = current_security();
         struct inode_security_struct *dsec;
@@ -2531,7 +2536,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
         else if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) {
                 rc = security_transition_sid(sid, dsec->sid,
                                              inode_mode_to_security_class(inode->i_mode),
-                                             &newsid);
+                                             qstr, &newsid);
                 if (rc) {
                         printk(KERN_WARNING "%s:  "
                                "security_transition_sid failed, rc=%d (dev=%s "
@@ -2932,16 +2937,47 @@ static int selinux_file_ioctl(struct file *file, unsigned int cmd,
                               unsigned long arg)
 {
         const struct cred *cred = current_cred();
-        u32 av = 0;
+        int error = 0;
 
-        if (_IOC_DIR(cmd) & _IOC_WRITE)
-                av |= FILE__WRITE;
-        if (_IOC_DIR(cmd) & _IOC_READ)
-                av |= FILE__READ;
-        if (!av)
-                av = FILE__IOCTL;
+        switch (cmd) {
+        case FIONREAD:
+        /* fall through */
+        case FIBMAP:
+        /* fall through */
+        case FIGETBSZ:
+        /* fall through */
+        case EXT2_IOC_GETFLAGS:
+        /* fall through */
+        case EXT2_IOC_GETVERSION:
+                error = file_has_perm(cred, file, FILE__GETATTR);
+                break;
+
+        case EXT2_IOC_SETFLAGS:
+        /* fall through */
+        case EXT2_IOC_SETVERSION:
+                error = file_has_perm(cred, file, FILE__SETATTR);
+                break;
+
+        /* sys_ioctl() checks */
+        case FIONBIO:
+        /* fall through */
+        case FIOASYNC:
+                error = file_has_perm(cred, file, 0);
+                break;
 
-        return file_has_perm(cred, file, av);
+        case KDSKBENT:
+        case KDSKBSENT:
+                error = task_has_capability(current, cred, CAP_SYS_TTY_CONFIG,
+                                            SECURITY_CAP_AUDIT);
+                break;
+
+        /* default case assumes that the command will go
+         * to the file's ioctl() function.
+         */
+        default:
+                error = file_has_perm(cred, file, FILE__IOCTL);
+        }
+        return error;
 }
 
 static int default_noexec;
@@ -3644,9 +3680,16 @@ static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid)
 
 /* socket security operations */
 
-static u32 socket_sockcreate_sid(const struct task_security_struct *tsec)
+static int socket_sockcreate_sid(const struct task_security_struct *tsec,
+                                 u16 secclass, u32 *socksid)
 {
-        return tsec->sockcreate_sid ? : tsec->sid;
+        if (tsec->sockcreate_sid > SECSID_NULL) {
+                *socksid = tsec->sockcreate_sid;
+                return 0;
+        }
+
+        return security_transition_sid(tsec->sid, tsec->sid, secclass, NULL,
+                                       socksid);
 }
 
 static int sock_has_perm(struct task_struct *task, struct sock *sk, u32 perms)
@@ -3670,12 +3713,16 @@ static int selinux_socket_create(int family, int type,
         const struct task_security_struct *tsec = current_security();
         u32 newsid;
         u16 secclass;
+        int rc;
 
         if (kern)
                 return 0;
 
-        newsid = socket_sockcreate_sid(tsec);
         secclass = socket_type_to_security_class(family, type, protocol);
+        rc = socket_sockcreate_sid(tsec, secclass, &newsid);
+        if (rc)
+                return rc;
+
         return avc_has_perm(tsec->sid, newsid, secclass, SOCKET__CREATE, NULL);
 }
 
@@ -3687,12 +3734,16 @@ static int selinux_socket_post_create(struct socket *sock, int family,
         struct sk_security_struct *sksec;
         int err = 0;
 
+        isec->sclass = socket_type_to_security_class(family, type, protocol);
+
         if (kern)
                 isec->sid = SECINITSID_KERNEL;
-        else
-                isec->sid = socket_sockcreate_sid(tsec);
+        else {
+                err = socket_sockcreate_sid(tsec, isec->sclass, &(isec->sid));
+                if (err)
+                        return err;
+        }
 
-        isec->sclass = socket_type_to_security_class(family, type, protocol);
         isec->initialized = 1;
 
         if (sock->sk) {
@@ -4002,7 +4053,6 @@ static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
 {
         int err = 0;
         struct sk_security_struct *sksec = sk->sk_security;
-        u32 peer_sid;
         u32 sk_sid = sksec->sid;
         struct common_audit_data ad;
         char *addrp;
@@ -4021,20 +4071,10 @@ static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
                         return err;
         }
 
-        if (selinux_policycap_netpeer) {
-                err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
-                if (err)
-                        return err;
-                err = avc_has_perm(sk_sid, peer_sid,
-                                   SECCLASS_PEER, PEER__RECV, &ad);
-                if (err)
-                        selinux_netlbl_err(skb, err, 0);
-        } else {
-                err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad);
-                if (err)
-                        return err;
-                err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad);
-        }
+        err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad);
+        if (err)
+                return err;
+        err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad);
 
         return err;
 }
@@ -4529,9 +4569,8 @@ static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
                                  SECCLASS_PACKET, PACKET__SEND, &ad))
                         return NF_DROP_ERR(-ECONNREFUSED);
 
-        if (selinux_policycap_netpeer)
-                if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto))
-                        return NF_DROP_ERR(-ECONNREFUSED);
+        if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto))
+                return NF_DROP_ERR(-ECONNREFUSED);
 
         return NF_ACCEPT;
 }
@@ -4574,27 +4613,14 @@ static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex,
          * from the sending socket, otherwise use the kernel's sid */
         sk = skb->sk;
         if (sk == NULL) {
-                switch (family) {
-                case PF_INET:
-                        if (IPCB(skb)->flags & IPSKB_FORWARDED)
-                                secmark_perm = PACKET__FORWARD_OUT;
-                        else
-                                secmark_perm = PACKET__SEND;
-                        break;
-                case PF_INET6:
-                        if (IP6CB(skb)->flags & IP6SKB_FORWARDED)
-                                secmark_perm = PACKET__FORWARD_OUT;
-                        else
-                                secmark_perm = PACKET__SEND;
-                        break;
-                default:
-                        return NF_DROP_ERR(-ECONNREFUSED);
-                }
-                if (secmark_perm == PACKET__FORWARD_OUT) {
+                if (skb->skb_iif) {
+                        secmark_perm = PACKET__FORWARD_OUT;
                         if (selinux_skb_peerlbl_sid(skb, family, &peer_sid))
                                 return NF_DROP;
-                } else
+                } else {
+                        secmark_perm = PACKET__SEND;
                         peer_sid = SECINITSID_KERNEL;
+                }
         } else {
                 struct sk_security_struct *sksec = sk->sk_security;
                 peer_sid = sksec->sid;
@@ -4850,7 +4876,7 @@ static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
                  * message queue this message will be stored in
                  */
                 rc = security_transition_sid(sid, isec->sid, SECCLASS_MSG,
-                                             &msec->sid);
+                                             NULL, &msec->sid);
                 if (rc)
                         return rc;
         }
@@ -5404,7 +5430,6 @@ static struct security_operations selinux_ops = {
         .ptrace_traceme =               selinux_ptrace_traceme,
         .capget =                       selinux_capget,
         .capset =                       selinux_capset,
-        .sysctl =                       selinux_sysctl,
         .capable =                      selinux_capable,
         .quotactl =                     selinux_quotactl,
         .quota_on =                     selinux_quota_on,
@@ -5422,6 +5447,7 @@ static struct security_operations selinux_ops = {
         .sb_alloc_security =            selinux_sb_alloc_security,
         .sb_free_security =             selinux_sb_free_security,
         .sb_copy_data =                 selinux_sb_copy_data,
+        .sb_remount =                   selinux_sb_remount,
         .sb_kern_mount =                selinux_sb_kern_mount,
         .sb_show_options =              selinux_sb_show_options,
         .sb_statfs =                    selinux_sb_statfs,