mirror of https://gitee.com/openkylin/linux.git
Smack: Abstract use of cred security blob
Don't use the cred->security pointer directly. Provide a helper function that provides the security blob pointer. Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Reviewed-by: Kees Cook <keescook@chromium.org> [kees: adjusted for ordered init series] Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Casey Schaufler
Kees Cook
parent
6d9c939dbe
commit
b17103a8b8
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@ -356,6 +356,11 @@ extern struct list_head smack_onlycap_list;
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#define SMACK_HASH_SLOTS 16
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extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
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static inline struct task_smack *smack_cred(const struct cred *cred)
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{
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return cred->security;
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}
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/*
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* Is the directory transmuting?
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*/
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@ -382,13 +387,19 @@ static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
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return tsp->smk_task;
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}
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static inline struct smack_known *smk_of_task_struct(const struct task_struct *t)
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static inline struct smack_known *smk_of_task_struct(
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const struct task_struct *t)
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{
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struct smack_known *skp;
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const struct cred *cred;
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rcu_read_lock();
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skp = smk_of_task(__task_cred(t)->security);
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cred = __task_cred(t);
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skp = smk_of_task(smack_cred(cred));
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rcu_read_unlock();
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return skp;
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}
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@ -405,7 +416,7 @@ static inline struct smack_known *smk_of_forked(const struct task_smack *tsp)
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*/
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static inline struct smack_known *smk_of_current(void)
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{
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return smk_of_task(current_security());
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return smk_of_task(smack_cred(current_cred()));
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}
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/*
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@ -275,7 +275,7 @@ int smk_tskacc(struct task_smack *tsp, struct smack_known *obj_known,
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int smk_curacc(struct smack_known *obj_known,
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u32 mode, struct smk_audit_info *a)
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{
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struct task_smack *tsp = current_security();
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struct task_smack *tsp = smack_cred(current_cred());
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return smk_tskacc(tsp, obj_known, mode, a);
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}
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@ -635,7 +635,7 @@ DEFINE_MUTEX(smack_onlycap_lock);
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*/
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bool smack_privileged_cred(int cap, const struct cred *cred)
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{
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struct task_smack *tsp = cred->security;
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struct task_smack *tsp = smack_cred(cred);
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struct smack_known *skp = tsp->smk_task;
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struct smack_known_list_elem *sklep;
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int rc;
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@ -139,7 +139,7 @@ static int smk_bu_note(char *note, struct smack_known *sskp,
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static int smk_bu_current(char *note, struct smack_known *oskp,
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int mode, int rc)
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{
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struct task_smack *tsp = current_security();
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struct task_smack *tsp = smack_cred(current_cred());
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char acc[SMK_NUM_ACCESS_TYPE + 1];
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if (rc <= 0)
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@ -160,7 +160,7 @@ static int smk_bu_current(char *note, struct smack_known *oskp,
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#ifdef CONFIG_SECURITY_SMACK_BRINGUP
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static int smk_bu_task(struct task_struct *otp, int mode, int rc)
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{
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struct task_smack *tsp = current_security();
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struct task_smack *tsp = smack_cred(current_cred());
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struct smack_known *smk_task = smk_of_task_struct(otp);
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char acc[SMK_NUM_ACCESS_TYPE + 1];
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@ -182,7 +182,7 @@ static int smk_bu_task(struct task_struct *otp, int mode, int rc)
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#ifdef CONFIG_SECURITY_SMACK_BRINGUP
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static int smk_bu_inode(struct inode *inode, int mode, int rc)
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{
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struct task_smack *tsp = current_security();
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struct task_smack *tsp = smack_cred(current_cred());
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struct inode_smack *isp = inode->i_security;
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char acc[SMK_NUM_ACCESS_TYPE + 1];
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@ -212,7 +212,7 @@ static int smk_bu_inode(struct inode *inode, int mode, int rc)
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#ifdef CONFIG_SECURITY_SMACK_BRINGUP
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static int smk_bu_file(struct file *file, int mode, int rc)
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{
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struct task_smack *tsp = current_security();
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struct task_smack *tsp = smack_cred(current_cred());
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struct smack_known *sskp = tsp->smk_task;
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struct inode *inode = file_inode(file);
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struct inode_smack *isp = inode->i_security;
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@ -242,7 +242,7 @@ static int smk_bu_file(struct file *file, int mode, int rc)
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static int smk_bu_credfile(const struct cred *cred, struct file *file,
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int mode, int rc)
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{
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struct task_smack *tsp = cred->security;
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struct task_smack *tsp = smack_cred(cred);
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struct smack_known *sskp = tsp->smk_task;
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struct inode *inode = file_inode(file);
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struct inode_smack *isp = inode->i_security;
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@ -448,7 +448,7 @@ static int smk_ptrace_rule_check(struct task_struct *tracer,
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rcu_read_lock();
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tracercred = __task_cred(tracer);
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tsp = tracercred->security;
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tsp = smack_cred(tracercred);
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tracer_known = smk_of_task(tsp);
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if ((mode & PTRACE_MODE_ATTACH) &&
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@ -515,7 +515,7 @@ static int smack_ptrace_traceme(struct task_struct *ptp)
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int rc;
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struct smack_known *skp;
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skp = smk_of_task(current_security());
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skp = smk_of_task(smack_cred(current_cred()));
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rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__);
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return rc;
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@ -831,7 +831,7 @@ static int smack_sb_statfs(struct dentry *dentry)
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static int smack_bprm_set_creds(struct linux_binprm *bprm)
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{
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struct inode *inode = file_inode(bprm->file);
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struct task_smack *bsp = bprm->cred->security;
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struct task_smack *bsp = smack_cred(bprm->cred);
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struct inode_smack *isp;
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struct superblock_smack *sbsp;
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int rc;
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@ -1662,7 +1662,7 @@ static int smack_mmap_file(struct file *file,
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return -EACCES;
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mkp = isp->smk_mmap;
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tsp = current_security();
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tsp = smack_cred(current_cred());
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skp = smk_of_current();
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rc = 0;
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@ -1758,7 +1758,7 @@ static int smack_file_send_sigiotask(struct task_struct *tsk,
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struct fown_struct *fown, int signum)
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{
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struct smack_known *skp;
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struct smack_known *tkp = smk_of_task(tsk->cred->security);
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struct smack_known *tkp = smk_of_task(smack_cred(tsk->cred));
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const struct cred *tcred;
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struct file *file;
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int rc;
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@ -1811,7 +1811,7 @@ static int smack_file_receive(struct file *file)
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if (inode->i_sb->s_magic == SOCKFS_MAGIC) {
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sock = SOCKET_I(inode);
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ssp = sock->sk->sk_security;
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tsp = current_security();
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tsp = smack_cred(current_cred());
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/*
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* If the receiving process can't write to the
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* passed socket or if the passed socket can't
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@ -1853,7 +1853,7 @@ static int smack_file_receive(struct file *file)
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*/
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static int smack_file_open(struct file *file)
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{
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struct task_smack *tsp = file->f_cred->security;
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struct task_smack *tsp = smack_cred(file->f_cred);
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struct inode *inode = file_inode(file);
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struct smk_audit_info ad;
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int rc;
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@ -1900,7 +1900,7 @@ static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
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*/
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static void smack_cred_free(struct cred *cred)
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{
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struct task_smack *tsp = cred->security;
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struct task_smack *tsp = smack_cred(cred);
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struct smack_rule *rp;
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struct list_head *l;
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struct list_head *n;
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@ -1930,7 +1930,7 @@ static void smack_cred_free(struct cred *cred)
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static int smack_cred_prepare(struct cred *new, const struct cred *old,
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gfp_t gfp)
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{
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struct task_smack *old_tsp = old->security;
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struct task_smack *old_tsp = smack_cred(old);
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struct task_smack *new_tsp;
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int rc;
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@ -1961,15 +1961,14 @@ static int smack_cred_prepare(struct cred *new, const struct cred *old,
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*/
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static void smack_cred_transfer(struct cred *new, const struct cred *old)
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{
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struct task_smack *old_tsp = old->security;
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struct task_smack *new_tsp = new->security;
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struct task_smack *old_tsp = smack_cred(old);
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struct task_smack *new_tsp = smack_cred(new);
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new_tsp->smk_task = old_tsp->smk_task;
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new_tsp->smk_forked = old_tsp->smk_task;
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mutex_init(&new_tsp->smk_rules_lock);
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INIT_LIST_HEAD(&new_tsp->smk_rules);
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/* cbs copy rule list */
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}
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@ -1980,12 +1979,12 @@ static void smack_cred_transfer(struct cred *new, const struct cred *old)
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*
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* Sets the secid to contain a u32 version of the smack label.
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*/
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static void smack_cred_getsecid(const struct cred *c, u32 *secid)
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static void smack_cred_getsecid(const struct cred *cred, u32 *secid)
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{
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struct smack_known *skp;
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rcu_read_lock();
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skp = smk_of_task(c->security);
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skp = smk_of_task(smack_cred(cred));
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*secid = skp->smk_secid;
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rcu_read_unlock();
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}
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@ -1999,7 +1998,7 @@ static void smack_cred_getsecid(const struct cred *c, u32 *secid)
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*/
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static int smack_kernel_act_as(struct cred *new, u32 secid)
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{
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struct task_smack *new_tsp = new->security;
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struct task_smack *new_tsp = smack_cred(new);
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new_tsp->smk_task = smack_from_secid(secid);
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return 0;
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@ -2017,7 +2016,7 @@ static int smack_kernel_create_files_as(struct cred *new,
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struct inode *inode)
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{
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struct inode_smack *isp = inode->i_security;
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struct task_smack *tsp = new->security;
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struct task_smack *tsp = smack_cred(new);
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tsp->smk_forked = isp->smk_inode;
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tsp->smk_task = tsp->smk_forked;
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@ -2201,7 +2200,7 @@ static int smack_task_kill(struct task_struct *p, struct kernel_siginfo *info,
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* specific behavior. This is not clean. For one thing
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* we can't take privilege into account.
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*/
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skp = smk_of_task(cred->security);
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skp = smk_of_task(smack_cred(cred));
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rc = smk_access(skp, tkp, MAY_DELIVER, &ad);
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rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc);
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return rc;
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@ -3528,7 +3527,7 @@ static int smack_getprocattr(struct task_struct *p, char *name, char **value)
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*/
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static int smack_setprocattr(const char *name, void *value, size_t size)
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{
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struct task_smack *tsp = current_security();
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struct task_smack *tsp = smack_cred(current_cred());
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struct cred *new;
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struct smack_known *skp;
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struct smack_known_list_elem *sklep;
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@ -3569,7 +3568,7 @@ static int smack_setprocattr(const char *name, void *value, size_t size)
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if (new == NULL)
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return -ENOMEM;
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tsp = new->security;
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tsp = smack_cred(new);
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tsp->smk_task = skp;
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/*
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* process can change its label only once
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@ -4214,7 +4213,7 @@ static void smack_inet_csk_clone(struct sock *sk,
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static int smack_key_alloc(struct key *key, const struct cred *cred,
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unsigned long flags)
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{
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struct smack_known *skp = smk_of_task(cred->security);
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struct smack_known *skp = smk_of_task(smack_cred(cred));
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key->security = skp;
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return 0;
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@ -4245,7 +4244,7 @@ static int smack_key_permission(key_ref_t key_ref,
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{
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struct key *keyp;
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struct smk_audit_info ad;
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struct smack_known *tkp = smk_of_task(cred->security);
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struct smack_known *tkp = smk_of_task(smack_cred(cred));
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int request = 0;
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int rc;
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@ -4520,7 +4519,7 @@ static int smack_inode_copy_up(struct dentry *dentry, struct cred **new)
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return -ENOMEM;
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}
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tsp = new_creds->security;
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tsp = smack_cred(new_creds);
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/*
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* Get label from overlay inode and set it in create_sid
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@ -4548,8 +4547,8 @@ static int smack_dentry_create_files_as(struct dentry *dentry, int mode,
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const struct cred *old,
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struct cred *new)
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{
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struct task_smack *otsp = old->security;
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struct task_smack *ntsp = new->security;
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struct task_smack *otsp = smack_cred(old);
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struct task_smack *ntsp = smack_cred(new);
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struct inode_smack *isp;
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int may;
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@ -2208,14 +2208,14 @@ static const struct file_operations smk_logging_ops = {
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static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
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{
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struct task_smack *tsp = current_security();
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struct task_smack *tsp = smack_cred(current_cred());
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return smk_seq_start(s, pos, &tsp->smk_rules);
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}
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static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
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{
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struct task_smack *tsp = current_security();
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struct task_smack *tsp = smack_cred(current_cred());
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return smk_seq_next(s, v, pos, &tsp->smk_rules);
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}
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@ -2262,7 +2262,7 @@ static int smk_open_load_self(struct inode *inode, struct file *file)
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static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct task_smack *tsp = current_security();
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struct task_smack *tsp = smack_cred(current_cred());
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return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
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&tsp->smk_rules_lock, SMK_FIXED24_FMT);
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@ -2414,14 +2414,14 @@ static const struct file_operations smk_load2_ops = {
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static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
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{
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struct task_smack *tsp = current_security();
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struct task_smack *tsp = smack_cred(current_cred());
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return smk_seq_start(s, pos, &tsp->smk_rules);
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}
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static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
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{
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struct task_smack *tsp = current_security();
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struct task_smack *tsp = smack_cred(current_cred());
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return smk_seq_next(s, v, pos, &tsp->smk_rules);
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}
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@ -2467,7 +2467,7 @@ static int smk_open_load_self2(struct inode *inode, struct file *file)
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static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct task_smack *tsp = current_security();
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struct task_smack *tsp = smack_cred(current_cred());
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return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
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&tsp->smk_rules_lock, SMK_LONG_FMT);
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@ -2681,14 +2681,14 @@ static const struct file_operations smk_syslog_ops = {
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static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
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{
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struct task_smack *tsp = current_security();
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struct task_smack *tsp = smack_cred(current_cred());
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return smk_seq_start(s, pos, &tsp->smk_relabel);
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}
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static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
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{
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struct task_smack *tsp = current_security();
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struct task_smack *tsp = smack_cred(current_cred());
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return smk_seq_next(s, v, pos, &tsp->smk_relabel);
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}
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@ -2736,7 +2736,7 @@ static int smk_open_relabel_self(struct inode *inode, struct file *file)
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static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct task_smack *tsp = current_security();
|
||||
struct task_smack *tsp = smack_cred(current_cred());
|
||||
char *data;
|
||||
int rc;
|
||||
LIST_HEAD(list_tmp);
|
||||
|
|
|
|||
Loading…
Reference in New Issue