This patch adds a new security attribute to Smack called
SMACK64EXEC. It defines label that is used while task is running. Exception: in smack_task_wait() child task is checked for write access to parent task using label inherited from the task that forked it. Fixed issues from previous submit: - SMACK64EXEC was not read when SMACK64 was not set. - inode security blob was not updated after setting SMACK64EXEC - inode security blob was not updated when removing SMACK64EXEC
This commit is contained in:
Casey Schaufler
Родитель
93ae86e759
Коммит
676dac4b1b
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@ -40,9 +40,11 @@
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#define XATTR_SMACK_SUFFIX "SMACK64"
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#define XATTR_SMACK_IPIN "SMACK64IPIN"
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#define XATTR_SMACK_IPOUT "SMACK64IPOUT"
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#define XATTR_SMACK_EXEC "SMACK64EXEC"
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#define XATTR_NAME_SMACK XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX
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#define XATTR_NAME_SMACKIPIN XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN
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#define XATTR_NAME_SMACKIPOUT XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT
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#define XATTR_NAME_SMACKEXEC XATTR_SECURITY_PREFIX XATTR_SMACK_EXEC
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#define XATTR_CAPS_SUFFIX "capability"
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#define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX
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@ -51,10 +51,16 @@ struct socket_smack {
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*/
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struct inode_smack {
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char *smk_inode; /* label of the fso */
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char *smk_task; /* label of the task */
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struct mutex smk_lock; /* initialization lock */
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int smk_flags; /* smack inode flags */
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};
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struct task_smack {
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char *smk_task; /* label used for access control */
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char *smk_forked; /* label when forked */
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};
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#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
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/*
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@ -242,6 +248,30 @@ static inline char *smk_of_inode(const struct inode *isp)
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return sip->smk_inode;
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}
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/*
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* Present a pointer to the smack label in an task blob.
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*/
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static inline char *smk_of_task(const struct task_smack *tsp)
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{
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return tsp->smk_task;
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}
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/*
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* Present a pointer to the forked smack label in an task blob.
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*/
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static inline char *smk_of_forked(const struct task_smack *tsp)
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{
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return tsp->smk_forked;
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}
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/*
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* Present a pointer to the smack label in the curren task blob.
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*/
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static inline char *smk_of_current(void)
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{
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return smk_of_task(current_security());
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}
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/*
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* logging functions
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*/
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@ -185,7 +185,7 @@ out_audit:
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int smk_curacc(char *obj_label, u32 mode, struct smk_audit_info *a)
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{
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int rc;
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char *sp = current_security();
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char *sp = smk_of_current();
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rc = smk_access(sp, obj_label, mode, NULL);
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if (rc == 0)
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@ -196,7 +196,7 @@ int smk_curacc(char *obj_label, u32 mode, struct smk_audit_info *a)
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* only one that gets privilege and current does not
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* have that label.
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*/
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if (smack_onlycap != NULL && smack_onlycap != current->cred->security)
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if (smack_onlycap != NULL && smack_onlycap != sp)
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goto out_audit;
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if (capable(CAP_MAC_OVERRIDE))
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@ -43,7 +43,7 @@
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* Returns a pointer to the master list entry for the Smack label
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* or NULL if there was no label to fetch.
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*/
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static char *smk_fetch(struct inode *ip, struct dentry *dp)
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static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp)
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{
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int rc;
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char in[SMK_LABELLEN];
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@ -51,7 +51,7 @@ static char *smk_fetch(struct inode *ip, struct dentry *dp)
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if (ip->i_op->getxattr == NULL)
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return NULL;
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rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN);
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rc = ip->i_op->getxattr(dp, name, in, SMK_LABELLEN);
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if (rc < 0)
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return NULL;
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@ -103,8 +103,8 @@ static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
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if (rc != 0)
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return rc;
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sp = current_security();
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tsp = task_security(ctp);
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sp = smk_of_current();
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tsp = smk_of_task(task_security(ctp));
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smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
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smk_ad_setfield_u_tsk(&ad, ctp);
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@ -138,8 +138,8 @@ static int smack_ptrace_traceme(struct task_struct *ptp)
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smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
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smk_ad_setfield_u_tsk(&ad, ptp);
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sp = current_security();
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tsp = task_security(ptp);
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sp = smk_of_current();
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tsp = smk_of_task(task_security(ptp));
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/* we won't log here, because rc can be overriden */
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rc = smk_access(tsp, sp, MAY_READWRITE, NULL);
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if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE))
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@ -160,7 +160,7 @@ static int smack_ptrace_traceme(struct task_struct *ptp)
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static int smack_syslog(int typefrom_file)
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{
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int rc = 0;
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char *sp = current_security();
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char *sp = smk_of_current();
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if (capable(CAP_MAC_OVERRIDE))
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return 0;
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@ -390,6 +390,40 @@ static int smack_sb_umount(struct vfsmount *mnt, int flags)
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return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
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}
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/*
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* BPRM hooks
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*/
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static int smack_bprm_set_creds(struct linux_binprm *bprm)
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{
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struct task_smack *tsp = bprm->cred->security;
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struct inode_smack *isp;
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struct dentry *dp;
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int rc;
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rc = cap_bprm_set_creds(bprm);
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if (rc != 0)
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return rc;
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if (bprm->cred_prepared)
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return 0;
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if (bprm->file == NULL || bprm->file->f_dentry == NULL)
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return 0;
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dp = bprm->file->f_dentry;
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if (dp->d_inode == NULL)
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return 0;
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isp = dp->d_inode->i_security;
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if (isp->smk_task != NULL)
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tsp->smk_task = isp->smk_task;
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return 0;
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}
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/*
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* Inode hooks
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*/
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@ -402,7 +436,7 @@ static int smack_sb_umount(struct vfsmount *mnt, int flags)
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*/
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static int smack_inode_alloc_security(struct inode *inode)
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{
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inode->i_security = new_inode_smack(current_security());
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inode->i_security = new_inode_smack(smk_of_current());
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if (inode->i_security == NULL)
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return -ENOMEM;
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return 0;
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@ -664,7 +698,8 @@ static int smack_inode_setxattr(struct dentry *dentry, const char *name,
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if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
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strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
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strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
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strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
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strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
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if (!capable(CAP_MAC_ADMIN))
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rc = -EPERM;
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/*
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@ -704,9 +739,10 @@ static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
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char *nsp;
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/*
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* Not SMACK
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* Not SMACK or SMACKEXEC
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*/
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if (strcmp(name, XATTR_NAME_SMACK))
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if (strcmp(name, XATTR_NAME_SMACK) &&
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strcmp(name, XATTR_NAME_SMACKEXEC))
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return;
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isp = dentry->d_inode->i_security;
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@ -716,10 +752,18 @@ static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
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* assignment.
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*/
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nsp = smk_import(value, size);
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if (nsp != NULL)
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isp->smk_inode = nsp;
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else
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isp->smk_inode = smack_known_invalid.smk_known;
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if (strcmp(name, XATTR_NAME_SMACK) == 0) {
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if (nsp != NULL)
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isp->smk_inode = nsp;
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else
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isp->smk_inode = smack_known_invalid.smk_known;
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} else {
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if (nsp != NULL)
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isp->smk_task = nsp;
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else
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isp->smk_task = smack_known_invalid.smk_known;
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}
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return;
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}
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@ -752,12 +796,14 @@ static int smack_inode_getxattr(struct dentry *dentry, const char *name)
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*/
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static int smack_inode_removexattr(struct dentry *dentry, const char *name)
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{
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struct inode_smack *isp;
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struct smk_audit_info ad;
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int rc = 0;
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if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
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strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
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strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
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strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
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strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
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if (!capable(CAP_MAC_ADMIN))
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rc = -EPERM;
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} else
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@ -768,6 +814,11 @@ static int smack_inode_removexattr(struct dentry *dentry, const char *name)
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if (rc == 0)
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rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
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if (rc == 0) {
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isp = dentry->d_inode->i_security;
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isp->smk_task = NULL;
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}
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return rc;
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}
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@ -895,7 +946,7 @@ static int smack_file_permission(struct file *file, int mask)
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*/
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static int smack_file_alloc_security(struct file *file)
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{
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file->f_security = current_security();
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file->f_security = smk_of_current();
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return 0;
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}
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@ -1005,7 +1056,7 @@ static int smack_file_fcntl(struct file *file, unsigned int cmd,
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*/
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static int smack_file_set_fowner(struct file *file)
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{
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file->f_security = current_security();
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file->f_security = smk_of_current();
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return 0;
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}
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@ -1025,7 +1076,7 @@ static int smack_file_send_sigiotask(struct task_struct *tsk,
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{
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struct file *file;
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int rc;
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char *tsp = tsk->cred->security;
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char *tsp = smk_of_task(tsk->cred->security);
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struct smk_audit_info ad;
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/*
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@ -1082,7 +1133,9 @@ static int smack_file_receive(struct file *file)
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*/
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static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
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{
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cred->security = NULL;
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cred->security = kzalloc(sizeof(struct task_smack), gfp);
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if (cred->security == NULL)
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return -ENOMEM;
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return 0;
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}
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@ -1097,7 +1150,7 @@ 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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cred->security = NULL;
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kfree(cred->security);
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}
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/**
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@ -1111,7 +1164,16 @@ 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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new->security = old->security;
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struct task_smack *old_tsp = old->security;
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struct task_smack *new_tsp;
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new_tsp = kzalloc(sizeof(struct task_smack), gfp);
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if (new_tsp == NULL)
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return -ENOMEM;
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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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new->security = new_tsp;
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return 0;
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}
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@ -1124,7 +1186,11 @@ 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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new->security = old->security;
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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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new_tsp->smk_task = old_tsp->smk_task;
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new_tsp->smk_forked = old_tsp->smk_task;
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}
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/**
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@ -1136,12 +1202,13 @@ static void smack_cred_transfer(struct cred *new, const struct cred *old)
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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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char *smack = smack_from_secid(secid);
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if (smack == NULL)
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return -EINVAL;
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|
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new->security = smack;
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new_tsp->smk_task = smack;
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return 0;
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}
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@ -1157,8 +1224,10 @@ 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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|
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new->security = isp->smk_inode;
|
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tsp->smk_forked = isp->smk_inode;
|
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tsp->smk_task = isp->smk_inode;
|
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return 0;
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}
|
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|
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|
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@ -1175,7 +1244,7 @@ static int smk_curacc_on_task(struct task_struct *p, int access)
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|
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smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
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smk_ad_setfield_u_tsk(&ad, p);
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return smk_curacc(task_security(p), access, &ad);
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return smk_curacc(smk_of_task(task_security(p)), access, &ad);
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}
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|
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/**
|
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|
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@ -1221,7 +1290,7 @@ static int smack_task_getsid(struct task_struct *p)
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*/
|
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static void smack_task_getsecid(struct task_struct *p, u32 *secid)
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{
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*secid = smack_to_secid(task_security(p));
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*secid = smack_to_secid(smk_of_task(task_security(p)));
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}
|
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|
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/**
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|
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@ -1333,14 +1402,15 @@ static int smack_task_kill(struct task_struct *p, struct siginfo *info,
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* can write the receiver.
|
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*/
|
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if (secid == 0)
|
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return smk_curacc(task_security(p), MAY_WRITE, &ad);
|
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return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE,
|
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&ad);
|
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/*
|
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* If the secid isn't 0 we're dealing with some USB IO
|
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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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return smk_access(smack_from_secid(secid), task_security(p),
|
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MAY_WRITE, &ad);
|
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return smk_access(smack_from_secid(secid),
|
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smk_of_task(task_security(p)), MAY_WRITE, &ad);
|
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}
|
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|
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/**
|
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|
|
@ -1352,12 +1422,12 @@ static int smack_task_kill(struct task_struct *p, struct siginfo *info,
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static int smack_task_wait(struct task_struct *p)
|
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{
|
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struct smk_audit_info ad;
|
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char *sp = current_security();
|
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char *tsp = task_security(p);
|
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char *sp = smk_of_current();
|
||||
char *tsp = smk_of_forked(task_security(p));
|
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int rc;
|
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|
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/* we don't log here, we can be overriden */
|
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rc = smk_access(sp, tsp, MAY_WRITE, NULL);
|
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rc = smk_access(tsp, sp, MAY_WRITE, NULL);
|
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if (rc == 0)
|
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goto out_log;
|
||||
|
||||
|
|
@ -1378,7 +1448,7 @@ static int smack_task_wait(struct task_struct *p)
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|||
out_log:
|
||||
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
|
||||
smk_ad_setfield_u_tsk(&ad, p);
|
||||
smack_log(sp, tsp, MAY_WRITE, rc, &ad);
|
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smack_log(tsp, sp, MAY_WRITE, rc, &ad);
|
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return rc;
|
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}
|
||||
|
||||
|
|
@ -1392,7 +1462,7 @@ static int smack_task_wait(struct task_struct *p)
|
|||
static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
|
||||
{
|
||||
struct inode_smack *isp = inode->i_security;
|
||||
isp->smk_inode = task_security(p);
|
||||
isp->smk_inode = smk_of_task(task_security(p));
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -1411,7 +1481,7 @@ static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
|
|||
*/
|
||||
static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
|
||||
{
|
||||
char *csp = current_security();
|
||||
char *csp = smk_of_current();
|
||||
struct socket_smack *ssp;
|
||||
|
||||
ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
|
||||
|
|
@ -1752,7 +1822,7 @@ static int smack_flags_to_may(int flags)
|
|||
*/
|
||||
static int smack_msg_msg_alloc_security(struct msg_msg *msg)
|
||||
{
|
||||
msg->security = current_security();
|
||||
msg->security = smk_of_current();
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -1788,7 +1858,7 @@ static int smack_shm_alloc_security(struct shmid_kernel *shp)
|
|||
{
|
||||
struct kern_ipc_perm *isp = &shp->shm_perm;
|
||||
|
||||
isp->security = current_security();
|
||||
isp->security = smk_of_current();
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -1911,7 +1981,7 @@ static int smack_sem_alloc_security(struct sem_array *sma)
|
|||
{
|
||||
struct kern_ipc_perm *isp = &sma->sem_perm;
|
||||
|
||||
isp->security = current_security();
|
||||
isp->security = smk_of_current();
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -2029,7 +2099,7 @@ static int smack_msg_queue_alloc_security(struct msg_queue *msq)
|
|||
{
|
||||
struct kern_ipc_perm *kisp = &msq->q_perm;
|
||||
|
||||
kisp->security = current_security();
|
||||
kisp->security = smk_of_current();
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -2201,7 +2271,7 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
|
|||
struct super_block *sbp;
|
||||
struct superblock_smack *sbsp;
|
||||
struct inode_smack *isp;
|
||||
char *csp = current_security();
|
||||
char *csp = smk_of_current();
|
||||
char *fetched;
|
||||
char *final;
|
||||
struct dentry *dp;
|
||||
|
|
@ -2321,9 +2391,12 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
|
|||
* Get the dentry for xattr.
|
||||
*/
|
||||
dp = dget(opt_dentry);
|
||||
fetched = smk_fetch(inode, dp);
|
||||
fetched = smk_fetch(XATTR_NAME_SMACK, inode, dp);
|
||||
if (fetched != NULL)
|
||||
final = fetched;
|
||||
isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode,
|
||||
dp);
|
||||
|
||||
dput(dp);
|
||||
break;
|
||||
}
|
||||
|
|
@ -2358,7 +2431,7 @@ static int smack_getprocattr(struct task_struct *p, char *name, char **value)
|
|||
if (strcmp(name, "current") != 0)
|
||||
return -EINVAL;
|
||||
|
||||
cp = kstrdup(task_security(p), GFP_KERNEL);
|
||||
cp = kstrdup(smk_of_task(task_security(p)), GFP_KERNEL);
|
||||
if (cp == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
|
|
@ -2382,6 +2455,7 @@ static int smack_getprocattr(struct task_struct *p, char *name, char **value)
|
|||
static int smack_setprocattr(struct task_struct *p, char *name,
|
||||
void *value, size_t size)
|
||||
{
|
||||
struct task_smack *tsp;
|
||||
struct cred *new;
|
||||
char *newsmack;
|
||||
|
||||
|
|
@ -2414,7 +2488,13 @@ static int smack_setprocattr(struct task_struct *p, char *name,
|
|||
new = prepare_creds();
|
||||
if (new == NULL)
|
||||
return -ENOMEM;
|
||||
new->security = newsmack;
|
||||
tsp = kzalloc(sizeof(struct task_smack), GFP_KERNEL);
|
||||
if (tsp == NULL) {
|
||||
kfree(new);
|
||||
return -ENOMEM;
|
||||
}
|
||||
tsp->smk_task = newsmack;
|
||||
new->security = tsp;
|
||||
commit_creds(new);
|
||||
return size;
|
||||
}
|
||||
|
|
@ -2715,7 +2795,7 @@ static void smack_sock_graft(struct sock *sk, struct socket *parent)
|
|||
return;
|
||||
|
||||
ssp = sk->sk_security;
|
||||
ssp->smk_in = ssp->smk_out = current_security();
|
||||
ssp->smk_in = ssp->smk_out = smk_of_current();
|
||||
/* cssp->smk_packet is already set in smack_inet_csk_clone() */
|
||||
}
|
||||
|
||||
|
|
@ -2836,7 +2916,7 @@ static void smack_inet_csk_clone(struct sock *sk,
|
|||
static int smack_key_alloc(struct key *key, const struct cred *cred,
|
||||
unsigned long flags)
|
||||
{
|
||||
key->security = cred->security;
|
||||
key->security = smk_of_task(cred->security);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -2865,6 +2945,7 @@ static int smack_key_permission(key_ref_t key_ref,
|
|||
{
|
||||
struct key *keyp;
|
||||
struct smk_audit_info ad;
|
||||
char *tsp = smk_of_task(cred->security);
|
||||
|
||||
keyp = key_ref_to_ptr(key_ref);
|
||||
if (keyp == NULL)
|
||||
|
|
@ -2878,14 +2959,14 @@ static int smack_key_permission(key_ref_t key_ref,
|
|||
/*
|
||||
* This should not occur
|
||||
*/
|
||||
if (cred->security == NULL)
|
||||
if (tsp == NULL)
|
||||
return -EACCES;
|
||||
#ifdef CONFIG_AUDIT
|
||||
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
|
||||
ad.a.u.key_struct.key = keyp->serial;
|
||||
ad.a.u.key_struct.key_desc = keyp->description;
|
||||
#endif
|
||||
return smk_access(cred->security, keyp->security,
|
||||
return smk_access(tsp, keyp->security,
|
||||
MAY_READWRITE, &ad);
|
||||
}
|
||||
#endif /* CONFIG_KEYS */
|
||||
|
|
@ -3087,6 +3168,8 @@ struct security_operations smack_ops = {
|
|||
.sb_mount = smack_sb_mount,
|
||||
.sb_umount = smack_sb_umount,
|
||||
|
||||
.bprm_set_creds = smack_bprm_set_creds,
|
||||
|
||||
.inode_alloc_security = smack_inode_alloc_security,
|
||||
.inode_free_security = smack_inode_free_security,
|
||||
.inode_init_security = smack_inode_init_security,
|
||||
|
|
@ -3223,9 +3306,16 @@ static __init void init_smack_know_list(void)
|
|||
static __init int smack_init(void)
|
||||
{
|
||||
struct cred *cred;
|
||||
struct task_smack *tsp;
|
||||
|
||||
if (!security_module_enable(&smack_ops))
|
||||
tsp = kzalloc(sizeof(struct task_smack), GFP_KERNEL);
|
||||
if (tsp == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
if (!security_module_enable(&smack_ops)) {
|
||||
kfree(tsp);
|
||||
return 0;
|
||||
}
|
||||
|
||||
printk(KERN_INFO "Smack: Initializing.\n");
|
||||
|
||||
|
|
@ -3233,7 +3323,9 @@ static __init int smack_init(void)
|
|||
* Set the security state for the initial task.
|
||||
*/
|
||||
cred = (struct cred *) current->cred;
|
||||
cred->security = &smack_known_floor.smk_known;
|
||||
tsp->smk_forked = smack_known_floor.smk_known;
|
||||
tsp->smk_task = smack_known_floor.smk_known;
|
||||
cred->security = tsp;
|
||||
|
||||
/* initialize the smack_know_list */
|
||||
init_smack_know_list();
|
||||
|
|
|
|||
|
|
@ -121,7 +121,7 @@ static void smk_netlabel_audit_set(struct netlbl_audit *nap)
|
|||
{
|
||||
nap->loginuid = audit_get_loginuid(current);
|
||||
nap->sessionid = audit_get_sessionid(current);
|
||||
nap->secid = smack_to_secid(current_security());
|
||||
nap->secid = smack_to_secid(smk_of_current());
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -1160,7 +1160,7 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
|
|||
size_t count, loff_t *ppos)
|
||||
{
|
||||
char in[SMK_LABELLEN];
|
||||
char *sp = current->cred->security;
|
||||
char *sp = smk_of_task(current->cred->security);
|
||||
|
||||
if (!capable(CAP_MAC_ADMIN))
|
||||
return -EPERM;
|
||||
|
|
|
|||
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