diff options
Diffstat (limited to 'security/selinux/hooks.c')
-rw-r--r-- | security/selinux/hooks.c | 62 |
1 files changed, 39 insertions, 23 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 3aa811eba25b..c679ba653e1d 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -958,7 +958,8 @@ out_err: return rc; } -void selinux_write_opts(struct seq_file *m, struct security_mnt_opts *opts) +static void selinux_write_opts(struct seq_file *m, + struct security_mnt_opts *opts) { int i; char *prefix; @@ -1291,7 +1292,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent /* Default to the fs superblock SID. */ isec->sid = sbsec->sid; - if (sbsec->proc) { + if (sbsec->proc && !S_ISLNK(inode->i_mode)) { struct proc_inode *proci = PROC_I(inode); if (proci->pde) { isec->sclass = inode_mode_to_security_class(inode->i_mode); @@ -3549,38 +3550,44 @@ out: #endif /* IPV6 */ static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad, - char **addrp, int src, u8 *proto) + char **_addrp, int src, u8 *proto) { - int ret = 0; + char *addrp; + int ret; switch (ad->u.net.family) { case PF_INET: ret = selinux_parse_skb_ipv4(skb, ad, proto); - if (ret || !addrp) - break; - *addrp = (char *)(src ? &ad->u.net.v4info.saddr : - &ad->u.net.v4info.daddr); - break; + if (ret) + goto parse_error; + addrp = (char *)(src ? &ad->u.net.v4info.saddr : + &ad->u.net.v4info.daddr); + goto okay; #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) case PF_INET6: ret = selinux_parse_skb_ipv6(skb, ad, proto); - if (ret || !addrp) - break; - *addrp = (char *)(src ? &ad->u.net.v6info.saddr : - &ad->u.net.v6info.daddr); - break; + if (ret) + goto parse_error; + addrp = (char *)(src ? &ad->u.net.v6info.saddr : + &ad->u.net.v6info.daddr); + goto okay; #endif /* IPV6 */ default: - break; + addrp = NULL; + goto okay; } - if (unlikely(ret)) - printk(KERN_WARNING - "SELinux: failure in selinux_parse_skb()," - " unable to parse packet\n"); - +parse_error: + printk(KERN_WARNING + "SELinux: failure in selinux_parse_skb()," + " unable to parse packet\n"); return ret; + +okay: + if (_addrp) + *_addrp = addrp; + return 0; } /** @@ -5321,8 +5328,12 @@ static int selinux_setprocattr(struct task_struct *p, if (sid == 0) return -EINVAL; - - /* Only allow single threaded processes to change context */ + /* + * SELinux allows to change context in the following case only. + * - Single threaded processes. + * - Multi threaded processes intend to change its context into + * more restricted domain (defined by TYPEBOUNDS statement). + */ if (atomic_read(&p->mm->mm_users) != 1) { struct task_struct *g, *t; struct mm_struct *mm = p->mm; @@ -5330,11 +5341,16 @@ static int selinux_setprocattr(struct task_struct *p, do_each_thread(g, t) { if (t->mm == mm && t != p) { read_unlock(&tasklist_lock); - return -EPERM; + error = security_bounded_transition(tsec->sid, sid); + if (!error) + goto boundary_ok; + + return error; } } while_each_thread(g, t); read_unlock(&tasklist_lock); } +boundary_ok: /* Check permissions for the transition. */ error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, |