diff options
Diffstat (limited to 'security/smack/smackfs.c')
| -rw-r--r-- | security/smack/smackfs.c | 38 |
1 files changed, 30 insertions, 8 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c index 856c8a28752..e03a7e19c73 100644 --- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -86,6 +86,9 @@ LIST_HEAD(smack_rule_list); static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; +const char *smack_cipso_option = SMACK_CIPSO_OPTION; + + #define SEQ_READ_FINISHED 1 /* @@ -565,6 +568,11 @@ static ssize_t smk_write_cipso(struct file *file, const char __user *buf, goto unlockedout; } + /* labels cannot begin with a '-' */ + if (data[0] == '-') { + rc = -EINVAL; + goto unlockedout; + } data[count] = '\0'; rule = data; /* @@ -808,9 +816,18 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, if (m > BEBITS) return -EINVAL; - sp = smk_import(smack, 0); - if (sp == NULL) - return -EINVAL; + /* if smack begins with '-', its an option, don't import it */ + if (smack[0] != '-') { + sp = smk_import(smack, 0); + if (sp == NULL) + return -EINVAL; + } else { + /* check known options */ + if (strcmp(smack, smack_cipso_option) == 0) + sp = (char *)smack_cipso_option; + else + return -EINVAL; + } for (temp_mask = 0; m > 0; m--) { temp_mask |= mask_bits; @@ -849,18 +866,23 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, smk_netlbladdr_insert(skp); } } else { - rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, - &skp->smk_host.sin_addr, &skp->smk_mask, - PF_INET, &audit_info); + /* we delete the unlabeled entry, only if the previous label + * wasnt the special CIPSO option */ + if (skp->smk_label != smack_cipso_option) + rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, + &skp->smk_host.sin_addr, &skp->smk_mask, + PF_INET, &audit_info); + else + rc = 0; skp->smk_label = sp; } /* * Now tell netlabel about the single label nature of * this host so that incoming packets get labeled. + * but only if we didn't get the special CIPSO option */ - - if (rc == 0) + if (rc == 0 && sp != smack_cipso_option) rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET, smack_to_secid(skp->smk_label), &audit_info); |