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Merge branch 'smack-next-master' into next

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This commit is contained in:
James Morris 2010-12-03 08:21:01 +11:00
commit fe27d4b012
5 changed files with 178 additions and 54 deletions
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2
include/linux/xattr.h
View File

@ -40,9 +40,11 @@
#define XATTR_SMACK_SUFFIX "SMACK64"
#define XATTR_SMACK_IPIN "SMACK64IPIN"
#define XATTR_SMACK_IPOUT "SMACK64IPOUT"
#define XATTR_SMACK_EXEC "SMACK64EXEC"
#define XATTR_NAME_SMACK XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX
#define XATTR_NAME_SMACKIPIN XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN
#define XATTR_NAME_SMACKIPOUT XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT
#define XATTR_NAME_SMACKEXEC XATTR_SECURITY_PREFIX XATTR_SMACK_EXEC
#define XATTR_CAPS_SUFFIX "capability"
#define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX

30
security/smack/smack.h
View File

@ -51,10 +51,16 @@ struct socket_smack {
*/
struct inode_smack {
char *smk_inode; /* label of the fso */
char *smk_task; /* label of the task */
struct mutex smk_lock; /* initialization lock */
int smk_flags; /* smack inode flags */
};
struct task_smack {
char *smk_task; /* label used for access control */
char *smk_forked; /* label when forked */
};
#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
/*
@ -242,6 +248,30 @@ static inline char *smk_of_inode(const struct inode *isp)
return sip->smk_inode;
}
/*
* Present a pointer to the smack label in an task blob.
*/
static inline char *smk_of_task(const struct task_smack *tsp)
{
return tsp->smk_task;
}
/*
* Present a pointer to the forked smack label in an task blob.
*/
static inline char *smk_of_forked(const struct task_smack *tsp)
{
return tsp->smk_forked;
}
/*
* Present a pointer to the smack label in the curren task blob.
*/
static inline char *smk_of_current(void)
{
return smk_of_task(current_security());
}
/*
* logging functions
*/

4
security/smack/smack_access.c
View File

@ -185,7 +185,7 @@ out_audit:
int smk_curacc(char *obj_label, u32 mode, struct smk_audit_info *a)
{
int rc;
char *sp = current_security();
char *sp = smk_of_current();
rc = smk_access(sp, obj_label, mode, NULL);
if (rc == 0)
@ -196,7 +196,7 @@ int smk_curacc(char *obj_label, u32 mode, struct smk_audit_info *a)
* only one that gets privilege and current does not
* have that label.
*/
if (smack_onlycap != NULL && smack_onlycap != current->cred->security)
if (smack_onlycap != NULL && smack_onlycap != sp)
goto out_audit;
if (capable(CAP_MAC_OVERRIDE))

192
security/smack/smack_lsm.c
View File

@ -43,7 +43,7 @@
* Returns a pointer to the master list entry for the Smack label
* or NULL if there was no label to fetch.
*/
static char *smk_fetch(struct inode *ip, struct dentry *dp)
static char *smk_fetch(const char *name, struct inode *ip, struct dentry *dp)
{
int rc;
char in[SMK_LABELLEN];
@ -51,7 +51,7 @@ static char *smk_fetch(struct inode *ip, struct dentry *dp)
if (ip->i_op->getxattr == NULL)
return NULL;
rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN);
rc = ip->i_op->getxattr(dp, name, in, SMK_LABELLEN);
if (rc < 0)
return NULL;
@ -103,8 +103,8 @@ static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
if (rc != 0)
return rc;
sp = current_security();
tsp = task_security(ctp);
sp = smk_of_current();
tsp = smk_of_task(task_security(ctp));
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, ctp);
@ -138,8 +138,8 @@ static int smack_ptrace_traceme(struct task_struct *ptp)
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, ptp);
sp = current_security();
tsp = task_security(ptp);
sp = smk_of_current();
tsp = smk_of_task(task_security(ptp));
/* we won't log here, because rc can be overriden */
rc = smk_access(tsp, sp, MAY_READWRITE, NULL);
if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE))
@ -160,7 +160,7 @@ static int smack_ptrace_traceme(struct task_struct *ptp)
static int smack_syslog(int typefrom_file)
{
int rc = 0;
char *sp = current_security();
char *sp = smk_of_current();
if (capable(CAP_MAC_OVERRIDE))
return 0;
@ -390,6 +390,40 @@ static int smack_sb_umount(struct vfsmount *mnt, int flags)
return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
}
/*
* BPRM hooks
*/
static int smack_bprm_set_creds(struct linux_binprm *bprm)
{
struct task_smack *tsp = bprm->cred->security;
struct inode_smack *isp;
struct dentry *dp;
int rc;
rc = cap_bprm_set_creds(bprm);
if (rc != 0)
return rc;
if (bprm->cred_prepared)
return 0;
if (bprm->file == NULL || bprm->file->f_dentry == NULL)
return 0;
dp = bprm->file->f_dentry;
if (dp->d_inode == NULL)
return 0;
isp = dp->d_inode->i_security;
if (isp->smk_task != NULL)
tsp->smk_task = isp->smk_task;
return 0;
}
/*
* Inode hooks
*/
@ -402,7 +436,7 @@ static int smack_sb_umount(struct vfsmount *mnt, int flags)
*/
static int smack_inode_alloc_security(struct inode *inode)
{
inode->i_security = new_inode_smack(current_security());
inode->i_security = new_inode_smack(smk_of_current());
if (inode->i_security == NULL)
return -ENOMEM;
return 0;
@ -664,7 +698,8 @@ static int smack_inode_setxattr(struct dentry *dentry, const char *name,
if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
if (!capable(CAP_MAC_ADMIN))
rc = -EPERM;
/*
@ -704,9 +739,10 @@ static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
char *nsp;
/*
* Not SMACK
* Not SMACK or SMACKEXEC
*/
if (strcmp(name, XATTR_NAME_SMACK))
if (strcmp(name, XATTR_NAME_SMACK) &&
strcmp(name, XATTR_NAME_SMACKEXEC))
return;
isp = dentry->d_inode->i_security;
@ -716,10 +752,18 @@ static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
* assignment.
*/
nsp = smk_import(value, size);
if (nsp != NULL)
isp->smk_inode = nsp;
else
isp->smk_inode = smack_known_invalid.smk_known;
if (strcmp(name, XATTR_NAME_SMACK) == 0) {
if (nsp != NULL)
isp->smk_inode = nsp;
else
isp->smk_inode = smack_known_invalid.smk_known;
} else {
if (nsp != NULL)
isp->smk_task = nsp;
else
isp->smk_task = smack_known_invalid.smk_known;
}
return;
}
@ -752,12 +796,14 @@ static int smack_inode_getxattr(struct dentry *dentry, const char *name)
*/
static int smack_inode_removexattr(struct dentry *dentry, const char *name)
{
struct inode_smack *isp;
struct smk_audit_info ad;
int rc = 0;
if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
if (!capable(CAP_MAC_ADMIN))
rc = -EPERM;
} else
@ -768,6 +814,11 @@ static int smack_inode_removexattr(struct dentry *dentry, const char *name)
if (rc == 0)
rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);
if (rc == 0) {
isp = dentry->d_inode->i_security;
isp->smk_task = NULL;
}
return rc;
}
@ -895,7 +946,7 @@ static int smack_file_permission(struct file *file, int mask)
*/
static int smack_file_alloc_security(struct file *file)
{
file->f_security = current_security();
file->f_security = smk_of_current();
return 0;
}
@ -1005,7 +1056,7 @@ static int smack_file_fcntl(struct file *file, unsigned int cmd,
*/
static int smack_file_set_fowner(struct file *file)
{
file->f_security = current_security();
file->f_security = smk_of_current();
return 0;
}
@ -1025,7 +1076,7 @@ static int smack_file_send_sigiotask(struct task_struct *tsk,
{
struct file *file;
int rc;
char *tsp = tsk->cred->security;
char *tsp = smk_of_task(tsk->cred->security);
struct smk_audit_info ad;
/*
@ -1082,7 +1133,9 @@ static int smack_file_receive(struct file *file)
*/
static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
{
cred->security = NULL;
cred->security = kzalloc(sizeof(struct task_smack), gfp);
if (cred->security == NULL)
return -ENOMEM;
return 0;
}
@ -1097,7 +1150,7 @@ static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
*/
static void smack_cred_free(struct cred *cred)
{
cred->security = NULL;
kfree(cred->security);
}
/**
@ -1111,7 +1164,16 @@ static void smack_cred_free(struct cred *cred)
static int smack_cred_prepare(struct cred *new, const struct cred *old,
gfp_t gfp)
{
new->security = old->security;
struct task_smack *old_tsp = old->security;
struct task_smack *new_tsp;
new_tsp = kzalloc(sizeof(struct task_smack), gfp);
if (new_tsp == NULL)
return -ENOMEM;
new_tsp->smk_task = old_tsp->smk_task;
new_tsp->smk_forked = old_tsp->smk_task;
new->security = new_tsp;
return 0;
}
@ -1124,7 +1186,11 @@ static int smack_cred_prepare(struct cred *new, const struct cred *old,
*/
static void smack_cred_transfer(struct cred *new, const struct cred *old)
{
new->security = old->security;
struct task_smack *old_tsp = old->security;
struct task_smack *new_tsp = new->security;
new_tsp->smk_task = old_tsp->smk_task;
new_tsp->smk_forked = old_tsp->smk_task;
}
/**
@ -1136,12 +1202,13 @@ 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;
char *smack = smack_from_secid(secid);
if (smack == NULL)
return -EINVAL;
new->security = smack;
new_tsp->smk_task = smack;
return 0;
}
@ -1157,8 +1224,10 @@ static int smack_kernel_create_files_as(struct cred *new,
struct inode *inode)
{
struct inode_smack *isp = inode->i_security;
struct task_smack *tsp = new->security;
new->security = isp->smk_inode;
tsp->smk_forked = isp->smk_inode;
tsp->smk_task = isp->smk_inode;
return 0;
}
@ -1175,7 +1244,7 @@ static int smk_curacc_on_task(struct task_struct *p, int access)
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, p);
return smk_curacc(task_security(p), access, &ad);
return smk_curacc(smk_of_task(task_security(p)), access, &ad);
}
/**
@ -1221,7 +1290,7 @@ static int smack_task_getsid(struct task_struct *p)
*/
static void smack_task_getsecid(struct task_struct *p, u32 *secid)
{
*secid = smack_to_secid(task_security(p));
*secid = smack_to_secid(smk_of_task(task_security(p)));
}
/**
@ -1333,14 +1402,15 @@ static int smack_task_kill(struct task_struct *p, struct siginfo *info,
* can write the receiver.
*/
if (secid == 0)
return smk_curacc(task_security(p), MAY_WRITE, &ad);
return smk_curacc(smk_of_task(task_security(p)), MAY_WRITE,
&ad);
/*
* If the secid isn't 0 we're dealing with some USB IO
* specific behavior. This is not clean. For one thing
* we can't take privilege into account.
*/
return smk_access(smack_from_secid(secid), task_security(p),
MAY_WRITE, &ad);
return smk_access(smack_from_secid(secid),
smk_of_task(task_security(p)), MAY_WRITE, &ad);
}
/**
@ -1352,12 +1422,12 @@ static int smack_task_kill(struct task_struct *p, struct siginfo *info,
static int smack_task_wait(struct task_struct *p)
{
struct smk_audit_info ad;
char *sp = current_security();
char *tsp = task_security(p);
char *sp = smk_of_current();
char *tsp = smk_of_forked(task_security(p));
int rc;
/* we don't log here, we can be overriden */
rc = smk_access(sp, tsp, MAY_WRITE, NULL);
rc = smk_access(tsp, sp, MAY_WRITE, NULL);
if (rc == 0)
goto out_log;
@ -1378,7 +1448,7 @@ static int smack_task_wait(struct task_struct *p)
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);
smack_log(tsp, sp, MAY_WRITE, rc, &ad);
return rc;
}
@ -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();

4
security/smack/smackfs.c
View File

@ -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;