From 152f91d4d11a30106b9cc0b27b47e0e80b633ee8 Mon Sep 17 00:00:00 2001 From: Casey Schaufler Date: Mon, 14 Nov 2016 09:38:15 -0800 Subject: [PATCH] Smack: Remove unnecessary smack_known_invalid The invalid Smack label ("") and the Huh ("?") Smack label serve the same purpose and having both is unnecessary. While pulling out the invalid label it became clear that the use of smack_from_secid() was inconsistent, so that is repaired. The setting of inode labels to the invalid label could never happen in a functional system, has never been observed in the wild and is not what you'd really want for a failure behavior in any case. That is removed. Signed-off-by: Casey Schaufler --- security/smack/smack.h | 1 - security/smack/smack_access.c | 7 +------ security/smack/smack_lsm.c | 29 +++-------------------------- security/smack/smackfs.c | 3 --- 4 files changed, 4 insertions(+), 36 deletions(-) diff --git a/security/smack/smack.h b/security/smack/smack.h index 51fd301..77abe2ef 100644 --- a/security/smack/smack.h +++ b/security/smack/smack.h @@ -336,7 +336,6 @@ extern int smack_ptrace_rule; extern struct smack_known smack_known_floor; extern struct smack_known smack_known_hat; extern struct smack_known smack_known_huh; -extern struct smack_known smack_known_invalid; extern struct smack_known smack_known_star; extern struct smack_known smack_known_web; diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c index 23e5808..356e376 100644 --- a/security/smack/smack_access.c +++ b/security/smack/smack_access.c @@ -36,11 +36,6 @@ struct smack_known smack_known_floor = { .smk_secid = 5, }; -struct smack_known smack_known_invalid = { - .smk_known = "", - .smk_secid = 6, -}; - struct smack_known smack_known_web = { .smk_known = "@", .smk_secid = 7, @@ -615,7 +610,7 @@ struct smack_known *smack_from_secid(const u32 secid) * of a secid that is not on the list. */ rcu_read_unlock(); - return &smack_known_invalid; + return &smack_known_huh; } /* diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 46d8be43..4d90257 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -1384,20 +1384,14 @@ static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, skp = smk_import_entry(value, size); if (!IS_ERR(skp)) isp->smk_inode = skp; - else - isp->smk_inode = &smack_known_invalid; } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { skp = smk_import_entry(value, size); if (!IS_ERR(skp)) isp->smk_task = skp; - else - isp->smk_task = &smack_known_invalid; } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { skp = smk_import_entry(value, size); if (!IS_ERR(skp)) isp->smk_mmap = skp; - else - isp->smk_mmap = &smack_known_invalid; } return; @@ -2068,12 +2062,8 @@ static void smack_cred_transfer(struct cred *new, const struct cred *old) static int smack_kernel_act_as(struct cred *new, u32 secid) { struct task_smack *new_tsp = new->security; - struct smack_known *skp = smack_from_secid(secid); - - if (skp == NULL) - return -EINVAL; - new_tsp->smk_task = skp; + new_tsp->smk_task = smack_from_secid(secid); return 0; } @@ -3894,21 +3884,11 @@ static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, return &smack_known_web; return &smack_known_star; } - if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { + if ((sap->flags & NETLBL_SECATTR_SECID) != 0) /* * Looks like a fallback, which gives us a secid. */ - skp = smack_from_secid(sap->attr.secid); - /* - * This has got to be a bug because it is - * impossible to specify a fallback without - * specifying the label, which will ensure - * it has a secid, and the only way to get a - * secid is from a fallback. - */ - BUG_ON(skp == NULL); - return skp; - } + return smack_from_secid(sap->attr.secid); /* * Without guidance regarding the smack value * for the packet fall back on the network @@ -4771,7 +4751,6 @@ static __init void init_smack_known_list(void) mutex_init(&smack_known_hat.smk_rules_lock); mutex_init(&smack_known_floor.smk_rules_lock); mutex_init(&smack_known_star.smk_rules_lock); - mutex_init(&smack_known_invalid.smk_rules_lock); mutex_init(&smack_known_web.smk_rules_lock); /* * Initialize rule lists @@ -4780,7 +4759,6 @@ static __init void init_smack_known_list(void) INIT_LIST_HEAD(&smack_known_hat.smk_rules); INIT_LIST_HEAD(&smack_known_star.smk_rules); INIT_LIST_HEAD(&smack_known_floor.smk_rules); - INIT_LIST_HEAD(&smack_known_invalid.smk_rules); INIT_LIST_HEAD(&smack_known_web.smk_rules); /* * Create the known labels list @@ -4789,7 +4767,6 @@ static __init void init_smack_known_list(void) smk_insert_entry(&smack_known_hat); smk_insert_entry(&smack_known_star); smk_insert_entry(&smack_known_floor); - smk_insert_entry(&smack_known_invalid); smk_insert_entry(&smack_known_web); } diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c index 6492fe9..13743a0 100644 --- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -2998,9 +2998,6 @@ static int __init init_smk_fs(void) rc = smk_preset_netlabel(&smack_known_huh); if (err == 0 && rc < 0) err = rc; - rc = smk_preset_netlabel(&smack_known_invalid); - if (err == 0 && rc < 0) - err = rc; rc = smk_preset_netlabel(&smack_known_star); if (err == 0 && rc < 0) err = rc; -- 2.7.4