[PATCH v12 7/9] LSM: Multiple concurrent LSMs

From: Casey Schaufler
Date: Mon Jan 07 2013 - 21:14:06 EST

Subject: [PATCH v12 7/9] LSM: Multiple concurrent LSMs

Change the infrastructure for Linux Security Modules (LSM)s
from a single vector of hook handlers to a list based method
for handling multiple concurrent modules.

Abstract access to security blobs.
Remove commoncap calls.

Signed-off-by: Casey Schaufler <casey@xxxxxxxxxxxxxxxx>

---
security/smack/smack.h | 14 +-
security/smack/smack_access.c | 2 +-
security/smack/smack_lsm.c | 367 ++++++++++++++++++-----------------------
security/smack/smackfs.c | 16 +-
4 files changed, 183 insertions(+), 216 deletions(-)

diff --git a/security/smack/smack.h b/security/smack/smack.h
index 99b3612..c012d94 100644
--- a/security/smack/smack.h
+++ b/security/smack/smack.h
@@ -20,6 +20,7 @@
#include <net/netlabel.h>
#include <linux/list.h>
#include <linux/rculist.h>
+#include <linux/lsm.h>
#include <linux/lsm_audit.h>

/*
@@ -203,6 +204,7 @@ struct smk_audit_info {
* These functions are in smack_lsm.c
*/
struct inode_smack *new_inode_smack(char *);
+int smk_setcurrent(char *, size_t);

/*
* These functions are in smack_access.c
@@ -243,18 +245,18 @@ extern struct security_operations smack_ops;
/*
* Is the directory transmuting?
*/
-static inline int smk_inode_transmutable(const struct inode *isp)
+static inline int smk_inode_transmutable(struct inode *isp)
{
- struct inode_smack *sip = isp->i_security;
+ struct inode_smack *sip = lsm_get_inode(isp, &smack_ops);
return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
}

/*
* Present a pointer to the smack label in an inode blob.
*/
-static inline char *smk_of_inode(const struct inode *isp)
+static inline char *smk_of_inode(struct inode *isp)
{
- struct inode_smack *sip = isp->i_security;
+ struct inode_smack *sip = lsm_get_inode(isp, &smack_ops);
return sip->smk_inode;
}

@@ -279,7 +281,9 @@ static inline char *smk_of_forked(const struct task_smack *tsp)
*/
static inline char *smk_of_current(void)
{
- return smk_of_task(current_security());
+ struct task_smack *tsp = lsm_get_cred(current_cred(), &smack_ops);
+
+ return tsp->smk_task;
}

/*
diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
index db14689..b4b4044 100644
--- a/security/smack/smack_access.c
+++ b/security/smack/smack_access.c
@@ -197,7 +197,7 @@ out_audit:
*/
int smk_curacc(char *obj_label, u32 mode, struct smk_audit_info *a)
{
- struct task_smack *tsp = current_security();
+ struct task_smack *tsp = lsm_get_cred(current_cred(), &smack_ops);
char *sp = smk_of_task(tsp);
int may;
int rc;
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 38be92c..e625cbe 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -40,7 +40,16 @@
#include <linux/binfmts.h>
#include "smack.h"

-#define task_security(task) (task_cred_xxx((task), security))
+static void *task_security(struct task_struct *task)
+{
+ const struct cred *cred;
+
+ rcu_read_lock();
+ cred = __task_cred(task);
+ rcu_read_unlock();
+
+ return lsm_get_cred(cred, &smack_ops);
+}

#define TRANS_TRUE "TRUE"
#define TRANS_TRUE_SIZE 4
@@ -162,20 +171,14 @@ static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
*/
static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
{
- int rc;
struct smk_audit_info ad;
char *tsp;

- rc = cap_ptrace_access_check(ctp, mode);
- if (rc != 0)
- return rc;
-
tsp = smk_of_task(task_security(ctp));
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, ctp);

- rc = smk_curacc(tsp, MAY_READWRITE, &ad);
- return rc;
+ return smk_curacc(tsp, MAY_READWRITE, &ad);
}

/**
@@ -188,20 +191,14 @@ static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode)
*/
static int smack_ptrace_traceme(struct task_struct *ptp)
{
- int rc;
struct smk_audit_info ad;
char *tsp;

- rc = cap_ptrace_traceme(ptp);
- if (rc != 0)
- return rc;
-
tsp = smk_of_task(task_security(ptp));
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, ptp);

- rc = smk_curacc(tsp, MAY_READWRITE, &ad);
- return rc;
+ return smk_curacc(tsp, MAY_READWRITE, &ad);
}

/**
@@ -252,7 +249,7 @@ static int smack_sb_alloc_security(struct super_block *sb)
sbsp->smk_hat = smack_known_hat.smk_known;
sbsp->smk_initialized = 0;

- sb->s_security = sbsp;
+ lsm_set_super(sb, sbsp, &smack_ops);

return 0;
}
@@ -264,8 +261,10 @@ static int smack_sb_alloc_security(struct super_block *sb)
*/
static void smack_sb_free_security(struct super_block *sb)
{
- kfree(sb->s_security);
- sb->s_security = NULL;
+ struct superblock_smack *sbsp = lsm_get_super(sb, &smack_ops);
+
+ kfree(sbsp);
+ lsm_set_super(sb, NULL, &smack_ops);
}

/**
@@ -325,7 +324,7 @@ static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
{
struct dentry *root = sb->s_root;
struct inode *inode = root->d_inode;
- struct superblock_smack *sp = sb->s_security;
+ struct superblock_smack *sp = lsm_get_super(sb, &smack_ops);
struct inode_smack *isp;
char *op;
char *commap;
@@ -368,9 +367,9 @@ static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
/*
* Initialize the root inode.
*/
- isp = inode->i_security;
+ isp = lsm_get_inode(inode, &smack_ops);
if (isp == NULL)
- inode->i_security = new_inode_smack(sp->smk_root);
+ lsm_set_inode(inode, new_inode_smack(sp->smk_root), &smack_ops);
else
isp->smk_inode = sp->smk_root;

@@ -386,7 +385,7 @@ static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
*/
static int smack_sb_statfs(struct dentry *dentry)
{
- struct superblock_smack *sbp = dentry->d_sb->s_security;
+ struct superblock_smack *sbp = lsm_get_super(dentry->d_sb, &smack_ops);
int rc;
struct smk_audit_info ad;

@@ -411,12 +410,13 @@ static int smack_sb_statfs(struct dentry *dentry)
static int smack_sb_mount(const char *dev_name, struct path *path,
const char *type, unsigned long flags, void *data)
{
- struct superblock_smack *sbp = path->dentry->d_sb->s_security;
+ struct superblock_smack *sbp;
struct smk_audit_info ad;

smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, *path);

+ sbp = lsm_get_super(path->dentry->d_sb, &smack_ops);
return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
}

@@ -440,7 +440,7 @@ static int smack_sb_umount(struct vfsmount *mnt, int flags)
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, path);

- sbp = path.dentry->d_sb->s_security;
+ sbp = lsm_get_super(path.dentry->d_sb, &smack_ops);
return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
}

@@ -457,18 +457,13 @@ static int smack_sb_umount(struct vfsmount *mnt, int flags)
static int smack_bprm_set_creds(struct linux_binprm *bprm)
{
struct inode *inode = bprm->file->f_path.dentry->d_inode;
- struct task_smack *bsp = bprm->cred->security;
+ struct task_smack *bsp = lsm_get_cred(bprm->cred, &smack_ops);
struct inode_smack *isp;
- int rc;
-
- rc = cap_bprm_set_creds(bprm);
- if (rc != 0)
- return rc;

if (bprm->cred_prepared)
return 0;

- isp = inode->i_security;
+ isp = lsm_get_inode(inode, &smack_ops);
if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
return 0;

@@ -489,7 +484,7 @@ static int smack_bprm_set_creds(struct linux_binprm *bprm)
*/
static void smack_bprm_committing_creds(struct linux_binprm *bprm)
{
- struct task_smack *bsp = bprm->cred->security;
+ struct task_smack *bsp = lsm_get_cred(bprm->cred, &smack_ops);

if (bsp->smk_task != bsp->smk_forked)
current->pdeath_signal = 0;
@@ -503,13 +498,9 @@ static void smack_bprm_committing_creds(struct linux_binprm *bprm)
*/
static int smack_bprm_secureexec(struct linux_binprm *bprm)
{
- struct task_smack *tsp = current_security();
- int ret = cap_bprm_secureexec(bprm);
+ struct task_smack *tsp = lsm_get_cred(current_cred(), &smack_ops);

- if (!ret && (tsp->smk_task != tsp->smk_forked))
- ret = 1;
-
- return ret;
+ return (tsp->smk_task != tsp->smk_forked);
}

/*
@@ -524,9 +515,12 @@ static int smack_bprm_secureexec(struct linux_binprm *bprm)
*/
static int smack_inode_alloc_security(struct inode *inode)
{
- inode->i_security = new_inode_smack(smk_of_current());
- if (inode->i_security == NULL)
+ struct inode_smack *isp = new_inode_smack(smk_of_current());
+
+ if (isp == NULL)
return -ENOMEM;
+
+ lsm_set_inode(inode, isp, &smack_ops);
return 0;
}

@@ -538,8 +532,8 @@ static int smack_inode_alloc_security(struct inode *inode)
*/
static void smack_inode_free_security(struct inode *inode)
{
- kfree(inode->i_security);
- inode->i_security = NULL;
+ kfree(lsm_get_inode(inode, &smack_ops));
+ lsm_set_inode(inode, NULL, &smack_ops);
}

/**
@@ -558,7 +552,7 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir,
void **value, size_t *len)
{
struct smack_known *skp;
- struct inode_smack *issp = inode->i_security;
+ struct inode_smack *issp = lsm_get_inode(inode, &smack_ops);
char *csp = smk_of_current();
char *isp = smk_of_inode(inode);
char *dsp = smk_of_inode(dir);
@@ -863,7 +857,7 @@ static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
char *nsp;
- struct inode_smack *isp = dentry->d_inode->i_security;
+ struct inode_smack *isp = lsm_get_inode(dentry->d_inode, &smack_ops);

if (strcmp(name, XATTR_NAME_SMACK) == 0) {
nsp = smk_import(value, size);
@@ -938,7 +932,7 @@ static int smack_inode_removexattr(struct dentry *dentry, const char *name)
rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad);

if (rc == 0) {
- isp = dentry->d_inode->i_security;
+ isp = lsm_get_inode(dentry->d_inode, &smack_ops);
isp->smk_task = NULL;
isp->smk_mmap = NULL;
}
@@ -955,9 +949,8 @@ static int smack_inode_removexattr(struct dentry *dentry, const char *name)
*
* Returns the size of the attribute or an error code
*/
-static int smack_inode_getsecurity(const struct inode *inode,
- const char *name, void **buffer,
- bool alloc)
+static int smack_inode_getsecurity(const struct inode *inode, const char *name,
+ void **buffer, bool alloc)
{
struct socket_smack *ssp;
struct socket *sock;
@@ -968,7 +961,7 @@ static int smack_inode_getsecurity(const struct inode *inode,
int rc = 0;

if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
- isp = smk_of_inode(inode);
+ isp = smk_of_inode(ip);
ilen = strlen(isp) + 1;
*buffer = isp;
return ilen;
@@ -985,7 +978,7 @@ static int smack_inode_getsecurity(const struct inode *inode,
if (sock == NULL || sock->sk == NULL)
return -EOPNOTSUPP;

- ssp = sock->sk->sk_security;
+ ssp = lsm_get_sock(sock->sk, &smack_ops);

if (strcmp(name, XATTR_SMACK_IPIN) == 0)
isp = ssp->smk_in;
@@ -1015,13 +1008,11 @@ static int smack_inode_getsecurity(const struct inode *inode,
static int smack_inode_listsecurity(struct inode *inode, char *buffer,
size_t buffer_size)
{
- int len = strlen(XATTR_NAME_SMACK);
+ const int len = sizeof(XATTR_NAME_SMACK);

- if (buffer != NULL && len <= buffer_size) {
+ if (buffer != NULL && len <= buffer_size)
memcpy(buffer, XATTR_NAME_SMACK, len);
- return len;
- }
- return -EINVAL;
+ return len;
}

/**
@@ -1031,7 +1022,7 @@ static int smack_inode_listsecurity(struct inode *inode, char *buffer,
*/
static void smack_inode_getsecid(const struct inode *inode, u32 *secid)
{
- struct inode_smack *isp = inode->i_security;
+ struct inode_smack *isp = lsm_get_inode(inode, &smack_ops);

*secid = smack_to_secid(isp->smk_inode);
}
@@ -1070,7 +1061,7 @@ static int smack_file_permission(struct file *file, int mask)
*/
static int smack_file_alloc_security(struct file *file)
{
- file->f_security = smk_of_current();
+ lsm_set_file(file, smk_of_current(), &smack_ops);
return 0;
}

@@ -1083,7 +1074,7 @@ static int smack_file_alloc_security(struct file *file)
*/
static void smack_file_free_security(struct file *file)
{
- file->f_security = NULL;
+ lsm_set_file(file, NULL, &smack_ops);
}

/**
@@ -1101,15 +1092,16 @@ static int smack_file_ioctl(struct file *file, unsigned int cmd,
{
int rc = 0;
struct smk_audit_info ad;
+ char *fsp = lsm_get_file(file, &smack_ops);

smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);

if (_IOC_DIR(cmd) & _IOC_WRITE)
- rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
+ rc = smk_curacc(fsp, MAY_WRITE, &ad);

if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
- rc = smk_curacc(file->f_security, MAY_READ, &ad);
+ rc = smk_curacc(fsp, MAY_READ, &ad);

return rc;
}
@@ -1127,7 +1119,7 @@ static int smack_file_lock(struct file *file, unsigned int cmd)

smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
- return smk_curacc(file->f_security, MAY_WRITE, &ad);
+ return smk_curacc(lsm_get_file(file, &smack_ops), MAY_WRITE, &ad);
}

/**
@@ -1157,7 +1149,7 @@ static int smack_file_fcntl(struct file *file, unsigned int cmd,
case F_SETSIG:
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
- rc = smk_curacc(file->f_security, MAY_WRITE, &ad);
+ rc = smk_curacc(lsm_get_file(file, &smack_ops), MAY_WRITE, &ad);
break;
default:
break;
@@ -1201,12 +1193,12 @@ static int smack_mmap_file(struct file *file,
if (dp->d_inode == NULL)
return 0;

- isp = dp->d_inode->i_security;
+ isp = lsm_get_inode(dp->d_inode, &smack_ops);
if (isp->smk_mmap == NULL)
return 0;
msmack = isp->smk_mmap;

- tsp = current_security();
+ tsp = lsm_get_cred(current_cred(), &smack_ops);
sp = smk_of_current();
skp = smk_find_entry(sp);
rc = 0;
@@ -1285,7 +1277,7 @@ static int smack_mmap_file(struct file *file,
*/
static int smack_file_set_fowner(struct file *file)
{
- file->f_security = smk_of_current();
+ lsm_set_file(file, smk_of_current(), &smack_ops);
return 0;
}

@@ -1305,22 +1297,24 @@ static int smack_file_send_sigiotask(struct task_struct *tsk,
{
struct file *file;
int rc;
- char *tsp = smk_of_task(tsk->cred->security);
+ char *tsp = smk_of_task(lsm_get_cred(tsk->cred, &smack_ops));
+ char *fsp;
struct smk_audit_info ad;

/*
* struct fown_struct is never outside the context of a struct file
*/
file = container_of(fown, struct file, f_owner);
+ fsp = lsm_get_file(file, &smack_ops);

/* we don't log here as rc can be overriden */
- rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL);
+ rc = smk_access(fsp, tsp, MAY_WRITE, NULL);
if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE))
rc = 0;

smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, tsk);
- smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad);
+ smack_log(fsp, tsp, MAY_WRITE, rc, &ad);
return rc;
}

@@ -1345,7 +1339,7 @@ static int smack_file_receive(struct file *file)
if (file->f_mode & FMODE_WRITE)
may |= MAY_WRITE;

- return smk_curacc(file->f_security, may, &ad);
+ return smk_curacc(lsm_get_file(file, &smack_ops), may, &ad);
}

/**
@@ -1359,9 +1353,10 @@ static int smack_file_receive(struct file *file)
*/
static int smack_file_open(struct file *file, const struct cred *cred)
{
- struct inode_smack *isp = file->f_path.dentry->d_inode->i_security;
+ struct inode_smack *isp;

- file->f_security = isp->smk_inode;
+ isp = lsm_get_inode(file->f_path.dentry->d_inode, &smack_ops);
+ lsm_set_file(file, isp->smk_inode, &smack_ops);

return 0;
}
@@ -1387,7 +1382,7 @@ static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
if (tsp == NULL)
return -ENOMEM;

- cred->security = tsp;
+ lsm_set_cred(cred, tsp, &smack_ops);

return 0;
}
@@ -1400,14 +1395,14 @@ static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
*/
static void smack_cred_free(struct cred *cred)
{
- struct task_smack *tsp = cred->security;
+ struct task_smack *tsp = lsm_get_cred(cred, &smack_ops);
struct smack_rule *rp;
struct list_head *l;
struct list_head *n;

if (tsp == NULL)
return;
- cred->security = NULL;
+ lsm_set_cred(cred, NULL, &smack_ops);

list_for_each_safe(l, n, &tsp->smk_rules) {
rp = list_entry(l, struct smack_rule, list);
@@ -1428,7 +1423,7 @@ static void smack_cred_free(struct cred *cred)
static int smack_cred_prepare(struct cred *new, const struct cred *old,
gfp_t gfp)
{
- struct task_smack *old_tsp = old->security;
+ struct task_smack *old_tsp = lsm_get_cred(old, &smack_ops);
struct task_smack *new_tsp;
int rc;

@@ -1440,7 +1435,7 @@ static int smack_cred_prepare(struct cred *new, const struct cred *old,
if (rc != 0)
return rc;

- new->security = new_tsp;
+ lsm_set_cred(new, new_tsp, &smack_ops);
return 0;
}

@@ -1453,8 +1448,8 @@ static int smack_cred_prepare(struct cred *new, const struct cred *old,
*/
static void smack_cred_transfer(struct cred *new, const struct cred *old)
{
- struct task_smack *old_tsp = old->security;
- struct task_smack *new_tsp = new->security;
+ struct task_smack *old_tsp = lsm_get_cred(old, &smack_ops);
+ struct task_smack *new_tsp = lsm_get_cred(new, &smack_ops);

new_tsp->smk_task = old_tsp->smk_task;
new_tsp->smk_forked = old_tsp->smk_task;
@@ -1474,7 +1469,7 @@ 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 task_smack *new_tsp = lsm_get_cred(new, &smack_ops);
char *smack = smack_from_secid(secid);

if (smack == NULL)
@@ -1495,8 +1490,8 @@ static int smack_kernel_act_as(struct cred *new, u32 secid)
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;
+ struct inode_smack *isp = lsm_get_inode(inode, &smack_ops);
+ struct task_smack *tsp = lsm_get_cred(new, &smack_ops);

tsp->smk_forked = isp->smk_inode;
tsp->smk_task = isp->smk_inode;
@@ -1576,12 +1571,7 @@ static void smack_task_getsecid(struct task_struct *p, u32 *secid)
*/
static int smack_task_setnice(struct task_struct *p, int nice)
{
- int rc;
-
- rc = cap_task_setnice(p, nice);
- if (rc == 0)
- rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
- return rc;
+ return smk_curacc_on_task(p, MAY_WRITE, __func__);
}

/**
@@ -1593,12 +1583,7 @@ static int smack_task_setnice(struct task_struct *p, int nice)
*/
static int smack_task_setioprio(struct task_struct *p, int ioprio)
{
- int rc;
-
- rc = cap_task_setioprio(p, ioprio);
- if (rc == 0)
- rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
- return rc;
+ return smk_curacc_on_task(p, MAY_WRITE, __func__);
}

/**
@@ -1622,12 +1607,7 @@ static int smack_task_getioprio(struct task_struct *p)
*/
static int smack_task_setscheduler(struct task_struct *p)
{
- int rc;
-
- rc = cap_task_setscheduler(p);
- if (rc == 0)
- rc = smk_curacc_on_task(p, MAY_WRITE, __func__);
- return rc;
+ return smk_curacc_on_task(p, MAY_WRITE, __func__);
}

/**
@@ -1715,7 +1695,7 @@ 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;
+ struct inode_smack *isp = lsm_get_inode(inode, &smack_ops);
isp->smk_inode = smk_of_task(task_security(p));
}

@@ -1746,7 +1726,7 @@ static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
ssp->smk_out = csp;
ssp->smk_packet = NULL;

- sk->sk_security = ssp;
+ lsm_set_sock(sk, ssp, &smack_ops);

return 0;
}
@@ -1759,7 +1739,8 @@ static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
*/
static void smack_sk_free_security(struct sock *sk)
{
- kfree(sk->sk_security);
+ kfree(lsm_get_sock(sk, &smack_ops));
+ lsm_set_sock(sk, NULL, &smack_ops);
}

/**
@@ -1812,7 +1793,7 @@ static char *smack_host_label(struct sockaddr_in *sip)
static int smack_netlabel(struct sock *sk, int labeled)
{
struct smack_known *skp;
- struct socket_smack *ssp = sk->sk_security;
+ struct socket_smack *ssp = lsm_get_sock(sk, &smack_ops);
int rc = 0;

/*
@@ -1856,7 +1837,7 @@ static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap)
int rc;
int sk_lbl;
char *hostsp;
- struct socket_smack *ssp = sk->sk_security;
+ struct socket_smack *ssp = lsm_get_sock(sk, &smack_ops);
struct smk_audit_info ad;

rcu_read_lock();
@@ -1899,7 +1880,7 @@ static int smack_inode_setsecurity(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
char *sp;
- struct inode_smack *nsp = inode->i_security;
+ struct inode_smack *nsp = lsm_get_inode(inode, &smack_ops);
struct socket_smack *ssp;
struct socket *sock;
int rc = 0;
@@ -1926,7 +1907,7 @@ static int smack_inode_setsecurity(struct inode *inode, const char *name,
if (sock == NULL || sock->sk == NULL)
return -EOPNOTSUPP;

- ssp = sock->sk->sk_security;
+ ssp = lsm_get_sock(sock->sk, &smack_ops);

if (strcmp(name, XATTR_SMACK_IPIN) == 0)
ssp->smk_in = sp;
@@ -2017,7 +1998,7 @@ static int smack_flags_to_may(int flags)
*/
static int smack_msg_msg_alloc_security(struct msg_msg *msg)
{
- msg->security = smk_of_current();
+ lsm_set_msg(msg, smk_of_current(), &smack_ops);
return 0;
}

@@ -2029,7 +2010,7 @@ static int smack_msg_msg_alloc_security(struct msg_msg *msg)
*/
static void smack_msg_msg_free_security(struct msg_msg *msg)
{
- msg->security = NULL;
+ lsm_set_msg(msg, NULL, &smack_ops);
}

/**
@@ -2040,7 +2021,7 @@ static void smack_msg_msg_free_security(struct msg_msg *msg)
*/
static char *smack_of_shm(struct shmid_kernel *shp)
{
- return (char *)shp->shm_perm.security;
+ return lsm_get_ipc(&shp->shm_perm, &smack_ops);
}

/**
@@ -2051,9 +2032,7 @@ static char *smack_of_shm(struct shmid_kernel *shp)
*/
static int smack_shm_alloc_security(struct shmid_kernel *shp)
{
- struct kern_ipc_perm *isp = &shp->shm_perm;
-
- isp->security = smk_of_current();
+ lsm_set_ipc(&shp->shm_perm, smk_of_current(), &smack_ops);
return 0;
}

@@ -2065,9 +2044,7 @@ static int smack_shm_alloc_security(struct shmid_kernel *shp)
*/
static void smack_shm_free_security(struct shmid_kernel *shp)
{
- struct kern_ipc_perm *isp = &shp->shm_perm;
-
- isp->security = NULL;
+ lsm_set_ipc(&shp->shm_perm, NULL, &smack_ops);
}

/**
@@ -2079,14 +2056,13 @@ static void smack_shm_free_security(struct shmid_kernel *shp)
*/
static int smk_curacc_shm(struct shmid_kernel *shp, int access)
{
- char *ssp = smack_of_shm(shp);
struct smk_audit_info ad;

#ifdef CONFIG_AUDIT
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
ad.a.u.ipc_id = shp->shm_perm.id;
#endif
- return smk_curacc(ssp, access, &ad);
+ return smk_curacc(smack_of_shm(shp), access, &ad);
}

/**
@@ -2098,10 +2074,7 @@ static int smk_curacc_shm(struct shmid_kernel *shp, int access)
*/
static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
{
- int may;
-
- may = smack_flags_to_may(shmflg);
- return smk_curacc_shm(shp, may);
+ return smk_curacc_shm(shp, smack_flags_to_may(shmflg));
}

/**
@@ -2149,10 +2122,7 @@ static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
int shmflg)
{
- int may;
-
- may = smack_flags_to_may(shmflg);
- return smk_curacc_shm(shp, may);
+ return smk_curacc_shm(shp, smack_flags_to_may(shmflg));
}

/**
@@ -2163,7 +2133,7 @@ static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
*/
static char *smack_of_sem(struct sem_array *sma)
{
- return (char *)sma->sem_perm.security;
+ return lsm_get_ipc(&sma->sem_perm, &smack_ops);
}

/**
@@ -2174,9 +2144,7 @@ static char *smack_of_sem(struct sem_array *sma)
*/
static int smack_sem_alloc_security(struct sem_array *sma)
{
- struct kern_ipc_perm *isp = &sma->sem_perm;
-
- isp->security = smk_of_current();
+ lsm_set_ipc(&sma->sem_perm, smk_of_current(), &smack_ops);
return 0;
}

@@ -2188,9 +2156,7 @@ static int smack_sem_alloc_security(struct sem_array *sma)
*/
static void smack_sem_free_security(struct sem_array *sma)
{
- struct kern_ipc_perm *isp = &sma->sem_perm;
-
- isp->security = NULL;
+ lsm_set_ipc(&sma->sem_perm, NULL, &smack_ops);
}

/**
@@ -2221,10 +2187,7 @@ static int smk_curacc_sem(struct sem_array *sma, int access)
*/
static int smack_sem_associate(struct sem_array *sma, int semflg)
{
- int may;
-
- may = smack_flags_to_may(semflg);
- return smk_curacc_sem(sma, may);
+ return smk_curacc_sem(sma, smack_flags_to_may(semflg));
}

/**
@@ -2292,9 +2255,7 @@ static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
*/
static int smack_msg_queue_alloc_security(struct msg_queue *msq)
{
- struct kern_ipc_perm *kisp = &msq->q_perm;
-
- kisp->security = smk_of_current();
+ lsm_set_ipc(&msq->q_perm, smk_of_current(), &smack_ops);
return 0;
}

@@ -2306,9 +2267,7 @@ static int smack_msg_queue_alloc_security(struct msg_queue *msq)
*/
static void smack_msg_queue_free_security(struct msg_queue *msq)
{
- struct kern_ipc_perm *kisp = &msq->q_perm;
-
- kisp->security = NULL;
+ lsm_set_ipc(&msq->q_perm, NULL, &smack_ops);
}

/**
@@ -2319,7 +2278,7 @@ static void smack_msg_queue_free_security(struct msg_queue *msq)
*/
static char *smack_of_msq(struct msg_queue *msq)
{
- return (char *)msq->q_perm.security;
+ return lsm_get_ipc(&msq->q_perm, &smack_ops);
}

/**
@@ -2350,10 +2309,7 @@ static int smk_curacc_msq(struct msg_queue *msq, int access)
*/
static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
{
- int may;
-
- may = smack_flags_to_may(msqflg);
- return smk_curacc_msq(msq, may);
+ return smk_curacc_msq(msq, smack_flags_to_may(msqflg));
}

/**
@@ -2400,10 +2356,7 @@ static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
int msqflg)
{
- int may;
-
- may = smack_flags_to_may(msqflg);
- return smk_curacc_msq(msq, may);
+ return smk_curacc_msq(msq, smack_flags_to_may(msqflg));
}

/**
@@ -2431,15 +2384,14 @@ static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
*/
static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
{
- char *isp = ipp->security;
- int may = smack_flags_to_may(flag);
struct smk_audit_info ad;

#ifdef CONFIG_AUDIT
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
ad.a.u.ipc_id = ipp->id;
#endif
- return smk_curacc(isp, may, &ad);
+ return smk_curacc(lsm_get_ipc(ipp, &smack_ops),
+ smack_flags_to_may(flag), &ad);
}

/**
@@ -2449,9 +2401,7 @@ static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
*/
static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
{
- char *smack = ipp->security;
-
- *secid = smack_to_secid(smack);
+ *secid = smack_to_secid(lsm_get_ipc(ipp, &smack_ops));
}

/**
@@ -2477,7 +2427,7 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
if (inode == NULL)
return;

- isp = inode->i_security;
+ isp = lsm_get_inode(inode, &smack_ops);

mutex_lock(&isp->smk_lock);
/*
@@ -2488,7 +2438,7 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
goto unlockandout;

sbp = inode->i_sb;
- sbsp = sbp->s_security;
+ sbsp = lsm_get_super(sbp, &smack_ops);
/*
* We're going to use the superblock default label
* if there's no label on the file.
@@ -2670,40 +2620,26 @@ static int smack_getprocattr(struct task_struct *p, char *name, char **value)
}

/**
- * smack_setprocattr - Smack process attribute setting
- * @p: the object task
- * @name: the name of the attribute in /proc/.../attr
+ * smk_setcurrent - Set Smack process attribute setting
* @value: the value to set
* @size: the size of the value
*
- * Sets the Smack value of the task. Only setting self
- * is permitted and only with privilege
+ * Sets the Smack value of the task. Only with privilege
*
* Returns the length of the smack label or an error code
*/
-static int smack_setprocattr(struct task_struct *p, char *name,
- void *value, size_t size)
+int smk_setcurrent(char *value, size_t size)
{
struct task_smack *tsp;
struct cred *new;
char *newsmack;

- /*
- * Changing another process' Smack value is too dangerous
- * and supports no sane use case.
- */
- if (p != current)
- return -EPERM;
-
if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;

if (value == NULL || size == 0 || size >= SMK_LONGLABEL)
return -EINVAL;

- if (strcmp(name, "current") != 0)
- return -EINVAL;
-
newsmack = smk_import(value, size);
if (newsmack == NULL)
return -EINVAL;
@@ -2718,7 +2654,7 @@ static int smack_setprocattr(struct task_struct *p, char *name,
if (new == NULL)
return -ENOMEM;

- tsp = new->security;
+ tsp = lsm_get_cred(new, &smack_ops);
tsp->smk_task = newsmack;

commit_creds(new);
@@ -2726,6 +2662,33 @@ static int smack_setprocattr(struct task_struct *p, char *name,
}

/**
+ * smack_setprocattr - Smack process attribute setting
+ * @p: the object task
+ * @name: the name of the attribute in /proc/.../attr
+ * @value: the value to set
+ * @size: the size of the value
+ *
+ * Sets the Smack value of the task. Only setting self
+ * is permitted and only with privilege
+ *
+ * Returns the length of the smack label or an error code
+ */
+static int smack_setprocattr(struct task_struct *p, char *name,
+ void *value, size_t size)
+{
+ /*
+ * Changing another process' Smack value is too dangerous
+ * and supports no sane use case.
+ */
+ if (p != current)
+ return -EPERM;
+ if (strcmp(name, "current") != 0)
+ return -EINVAL;
+
+ return smk_setcurrent(value, size);
+}
+
+/**
* smack_unix_stream_connect - Smack access on UDS
* @sock: one sock
* @other: the other sock
@@ -2737,9 +2700,9 @@ static int smack_setprocattr(struct task_struct *p, char *name,
static int smack_unix_stream_connect(struct sock *sock,
struct sock *other, struct sock *newsk)
{
- struct socket_smack *ssp = sock->sk_security;
- struct socket_smack *osp = other->sk_security;
- struct socket_smack *nsp = newsk->sk_security;
+ struct socket_smack *ssp = lsm_get_sock(sock, &smack_ops);
+ struct socket_smack *osp = lsm_get_sock(other, &smack_ops);
+ struct socket_smack *nsp = lsm_get_sock(newsk, &smack_ops);
struct smk_audit_info ad;
int rc = 0;

@@ -2774,8 +2737,8 @@ static int smack_unix_stream_connect(struct sock *sock,
*/
static int smack_unix_may_send(struct socket *sock, struct socket *other)
{
- struct socket_smack *ssp = sock->sk->sk_security;
- struct socket_smack *osp = other->sk->sk_security;
+ struct socket_smack *ssp = lsm_get_sock(sock->sk, &smack_ops);
+ struct socket_smack *osp = lsm_get_sock(other->sk, &smack_ops);
struct smk_audit_info ad;
int rc = 0;

@@ -2894,7 +2857,7 @@ static char *smack_from_secattr(struct netlbl_lsm_secattr *sap,
static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
struct netlbl_lsm_secattr secattr;
- struct socket_smack *ssp = sk->sk_security;
+ struct socket_smack *ssp = lsm_get_sock(sk, &smack_ops);
char *csp;
int rc;
struct smk_audit_info ad;
@@ -2953,7 +2916,7 @@ static int smack_socket_getpeersec_stream(struct socket *sock,
int slen = 1;
int rc = 0;

- ssp = sock->sk->sk_security;
+ ssp = lsm_get_sock(sock->sk, &smack_ops);
if (ssp->smk_packet != NULL) {
rcp = ssp->smk_packet;
slen = strlen(rcp) + 1;
@@ -3000,14 +2963,14 @@ static int smack_socket_getpeersec_dgram(struct socket *sock,
family = sock->sk->sk_family;

if (family == PF_UNIX) {
- ssp = sock->sk->sk_security;
+ ssp = lsm_get_sock(sock->sk, &smack_ops);
s = smack_to_secid(ssp->smk_out);
} else if (family == PF_INET || family == PF_INET6) {
/*
* Translate what netlabel gave us.
*/
if (sock != NULL && sock->sk != NULL)
- ssp = sock->sk->sk_security;
+ ssp = lsm_get_sock(sock->sk, &smack_ops);
netlbl_secattr_init(&secattr);
rc = netlbl_skbuff_getattr(skb, family, &secattr);
if (rc == 0) {
@@ -3038,7 +3001,7 @@ static void smack_sock_graft(struct sock *sk, struct socket *parent)
(sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
return;

- ssp = sk->sk_security;
+ ssp = lsm_get_sock(sk, &smack_ops);
ssp->smk_in = ssp->smk_out = smk_of_current();
/* cssp->smk_packet is already set in smack_inet_csk_clone() */
}
@@ -3057,7 +3020,7 @@ static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
{
u16 family = sk->sk_family;
struct smack_known *skp;
- struct socket_smack *ssp = sk->sk_security;
+ struct socket_smack *ssp = lsm_get_sock(sk, &smack_ops);
struct netlbl_lsm_secattr secattr;
struct sockaddr_in addr;
struct iphdr *hdr;
@@ -3131,7 +3094,7 @@ static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
static void smack_inet_csk_clone(struct sock *sk,
const struct request_sock *req)
{
- struct socket_smack *ssp = sk->sk_security;
+ struct socket_smack *ssp = lsm_get_sock(sk, &smack_ops);

if (req->peer_secid != 0)
ssp->smk_packet = smack_from_secid(req->peer_secid);
@@ -3161,7 +3124,8 @@ 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 = smk_of_task(cred->security);
+ lsm_set_key(key, smk_of_task(lsm_get_cred(cred, &smack_ops)),
+ &smack_ops);
return 0;
}

@@ -3173,7 +3137,7 @@ static int smack_key_alloc(struct key *key, const struct cred *cred,
*/
static void smack_key_free(struct key *key)
{
- key->security = NULL;
+ lsm_set_key(key, NULL, &smack_ops);
}

/*
@@ -3190,16 +3154,18 @@ 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);
+ char *tsp = smk_of_task(lsm_get_cred(cred, &smack_ops));
+ char *ksp;

keyp = key_ref_to_ptr(key_ref);
if (keyp == NULL)
return -EINVAL;
+ ksp = lsm_get_key(keyp, &smack_ops);
/*
* If the key hasn't been initialized give it access so that
* it may do so.
*/
- if (keyp->security == NULL)
+ if (ksp == NULL)
return 0;
/*
* This should not occur
@@ -3211,8 +3177,7 @@ static int smack_key_permission(key_ref_t key_ref,
ad.a.u.key_struct.key = keyp->serial;
ad.a.u.key_struct.key_desc = keyp->description;
#endif
- return smk_access(tsp, keyp->security,
- MAY_READWRITE, &ad);
+ return smk_access(tsp, ksp, MAY_READWRITE, &ad);
}
#endif /* CONFIG_KEYS */

@@ -3577,6 +3542,7 @@ static __init void init_smack_known_list(void)
*/
static __init int smack_init(void)
{
+ int rc;
struct cred *cred;
struct task_smack *tsp;

@@ -3594,17 +3560,14 @@ static __init int smack_init(void)
* Set the security state for the initial task.
*/
cred = (struct cred *) current->cred;
- cred->security = tsp;
+
+ rc = lsm_set_init_cred(cred, tsp, &smack_ops);
+ if (rc != 0)
+ panic("smack: Unable to initialize credentials.\n");

/* initialize the smack_known_list */
init_smack_known_list();

- /*
- * Register with LSM
- */
- if (register_security(&smack_ops))
- panic("smack: Unable to register with kernel.\n");
-
return 0;
}

diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 76a5dca..60071ef 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -108,7 +108,7 @@ struct smack_master_list {
struct smack_rule *smk_rule;
};

-LIST_HEAD(smack_rule_list);
+static LIST_HEAD(smack_rule_list);

static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;

@@ -1582,7 +1582,7 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
char *data;
- char *sp = smk_of_task(current->cred->security);
+ char *sp = smk_of_task(lsm_get_cred(current->cred, &smack_ops));
int rc = count;

if (!smack_privileged(CAP_MAC_ADMIN))
@@ -1696,14 +1696,14 @@ static const struct file_operations smk_logging_ops = {

static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
{
- struct task_smack *tsp = current_security();
+ struct task_smack *tsp = lsm_get_cred(current_cred(), &smack_ops);

return smk_seq_start(s, pos, &tsp->smk_rules);
}

static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
- struct task_smack *tsp = current_security();
+ struct task_smack *tsp = lsm_get_cred(current_cred(), &smack_ops);

return smk_seq_next(s, v, pos, &tsp->smk_rules);
}
@@ -1750,7 +1750,7 @@ static int smk_open_load_self(struct inode *inode, struct file *file)
static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
- struct task_smack *tsp = current_security();
+ struct task_smack *tsp = lsm_get_cred(current_cred(), &smack_ops);

return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
&tsp->smk_rules_lock, SMK_FIXED24_FMT);
@@ -1905,14 +1905,14 @@ static const struct file_operations smk_load2_ops = {

static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
{
- struct task_smack *tsp = current_security();
+ struct task_smack *tsp = lsm_get_cred(current_cred(), &smack_ops);

return smk_seq_start(s, pos, &tsp->smk_rules);
}

static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
- struct task_smack *tsp = current_security();
+ struct task_smack *tsp = lsm_get_cred(current_cred(), &smack_ops);

return smk_seq_next(s, v, pos, &tsp->smk_rules);
}
@@ -1958,7 +1958,7 @@ static int smk_open_load_self2(struct inode *inode, struct file *file)
static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
- struct task_smack *tsp = current_security();
+ struct task_smack *tsp = lsm_get_cred(current_cred(), &smack_ops);

return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
&tsp->smk_rules_lock, SMK_LONG_FMT);

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