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SubjectRe: [RFC] [PATCH] [1/6] LSM Stacking: Replace LSM void* with arrays
From
Date
The attached patch replaced the LSM security fields on kernel
objects with an array of pointers, so that more than 1 LSM
can annotate information on kernel objects.

-serge

Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>

Index: linux-2.6.10-rc1-bk12-stack/fs/exec.c
===================================================================
--- linux-2.6.10-rc1-bk12-stack.orig/fs/exec.c 2004-11-02
19:56:00.004087472 -0600
+++ linux-2.6.10-rc1-bk12-stack/fs/exec.c 2004-11-02 19:57:14.722728512
-0600
@@ -1164,8 +1164,7 @@
__free_page(page);
}

- if (bprm->security)
- security_bprm_free(bprm);
+ security_bprm_free(bprm);

out_mm:
if (bprm->mm)
Index: linux-2.6.10-rc1-bk12-stack/fs/inode.c
===================================================================
--- linux-2.6.10-rc1-bk12-stack.orig/fs/inode.c 2004-11-02
19:55:49.602668728 -0600
+++ linux-2.6.10-rc1-bk12-stack/fs/inode.c 2004-11-02 19:57:14.723728360
-0600
@@ -113,6 +113,7 @@

if (inode) {
struct address_space * const mapping = &inode->i_data;
+ int i;

inode->i_sb = sb;
inode->i_blkbits = sb->s_blocksize_bits;
@@ -134,7 +135,8 @@
inode->i_bdev = NULL;
inode->i_cdev = NULL;
inode->i_rdev = 0;
- inode->i_security = NULL;
+ for (i=0; i<CONFIG_NUM_LSMS; i++)
+ inode->i_security[i] = NULL;
inode->dirtied_when = 0;
if (security_inode_alloc(inode)) {
if (inode->i_sb->s_op->destroy_inode)
Index: linux-2.6.10-rc1-bk12-stack/include/linux/binfmts.h
===================================================================
--- linux-2.6.10-rc1-bk12-stack.orig/include/linux/binfmts.h 2004-10-18
16:54:30.000000000 -0500
+++ linux-2.6.10-rc1-bk12-stack/include/linux/binfmts.h 2004-11-02
19:57:14.737726232 -0600
@@ -29,7 +29,7 @@
struct file * file;
int e_uid, e_gid;
kernel_cap_t cap_inheritable, cap_permitted, cap_effective;
- void *security;
+ void *security[CONFIG_NUM_LSMS];
int argc, envc;
char * filename; /* Name of binary as seen by procps */
char * interp; /* Name of the binary really executed. Most
Index: linux-2.6.10-rc1-bk12-stack/include/linux/fs.h
===================================================================
--- linux-2.6.10-rc1-bk12-stack.orig/include/linux/fs.h 2004-11-02
19:56:00.579999920 -0600
+++ linux-2.6.10-rc1-bk12-stack/include/linux/fs.h 2004-11-02
19:57:14.739725928 -0600
@@ -479,7 +479,7 @@
unsigned int i_flags;

atomic_t i_writecount;
- void *i_security;
+ void *i_security[CONFIG_NUM_LSMS];
union {
void *generic_ip;
} u;
@@ -553,7 +553,7 @@
rwlock_t lock; /* protects pid, uid, euid fields */
int pid; /* pid or -pgrp where SIGIO should be sent */
uid_t uid, euid; /* uid/euid of process setting the owner */
- void *security;
+ void *security[CONFIG_NUM_LSMS];
int signum; /* posix.1b rt signal to be delivered on IO */
};

@@ -589,7 +589,7 @@
struct file_ra_state f_ra;

unsigned long f_version;
- void *f_security;
+ void *f_security[CONFIG_NUM_LSMS];

/* needed for tty driver, and maybe others */
void *private_data;
@@ -773,7 +773,7 @@
int s_syncing;
int s_need_sync_fs;
atomic_t s_active;
- void *s_security;
+ void *s_security[CONFIG_NUM_LSMS];
struct xattr_handler **s_xattr;

struct list_head s_dirty; /* dirty inodes */
Index: linux-2.6.10-rc1-bk12-stack/include/linux/ipc.h
===================================================================
--- linux-2.6.10-rc1-bk12-stack.orig/include/linux/ipc.h 2004-10-18
16:53:05.000000000 -0500
+++ linux-2.6.10-rc1-bk12-stack/include/linux/ipc.h 2004-11-02
19:57:14.745725016 -0600
@@ -65,7 +65,7 @@
gid_t cgid;
mode_t mode;
unsigned long seq;
- void *security;
+ void *security[CONFIG_NUM_LSMS];
};

#endif /* __KERNEL__ */
Index: linux-2.6.10-rc1-bk12-stack/include/linux/msg.h
===================================================================
--- linux-2.6.10-rc1-bk12-stack.orig/include/linux/msg.h 2004-10-18
16:54:31.000000000 -0500
+++ linux-2.6.10-rc1-bk12-stack/include/linux/msg.h 2004-11-02
19:57:14.745725016 -0600
@@ -70,7 +70,7 @@
long m_type;
int m_ts; /* message text size */
struct msg_msgseg* next;
- void *security;
+ void *security[CONFIG_NUM_LSMS];
/* the actual message follows immediately */
};

Index: linux-2.6.10-rc1-bk12-stack/include/linux/sched.h
===================================================================
--- linux-2.6.10-rc1-bk12-stack.orig/include/linux/sched.h 2004-11-02
19:56:00.667986544 -0600
+++ linux-2.6.10-rc1-bk12-stack/include/linux/sched.h 2004-11-02
19:57:14.746724864 -0600
@@ -627,7 +627,7 @@
void *notifier_data;
sigset_t *notifier_mask;

- void *security;
+ void *security[CONFIG_NUM_LSMS];
struct audit_context *audit_context;

/* Thread group tracking */
Index: linux-2.6.10-rc1-bk12-stack/include/net/sock.h
===================================================================
--- linux-2.6.10-rc1-bk12-stack.orig/include/net/sock.h 2004-11-02
19:56:00.764971800 -0600
+++ linux-2.6.10-rc1-bk12-stack/include/net/sock.h 2004-11-02
19:57:14.747724712 -0600
@@ -254,7 +254,7 @@
__u32 sk_sndmsg_off;
struct sk_buff *sk_send_head;
int sk_write_pending;
- void *sk_security;
+ void *sk_security[CONFIG_NUM_LSMS];
__u8 sk_queue_shrunk;
/* three bytes hole, try to pack */
void (*sk_state_change)(struct sock *sk);
Index: linux-2.6.10-rc1-bk12-stack/ipc/msg.c
===================================================================
--- linux-2.6.10-rc1-bk12-stack.orig/ipc/msg.c 2004-11-02
19:56:00.805965568 -0600
+++ linux-2.6.10-rc1-bk12-stack/ipc/msg.c 2004-11-02 19:57:14.747724712
-0600
@@ -90,6 +90,7 @@
int id;
int retval;
struct msg_queue *msq;
+ int i;

msq = ipc_rcu_alloc(sizeof(*msq));
if (!msq)
@@ -98,7 +99,9 @@
msq->q_perm.mode = (msgflg & S_IRWXUGO);
msq->q_perm.key = key;

- msq->q_perm.security = NULL;
+ for (i=0; i<CONFIG_NUM_LSMS; i++)
+ msq->q_perm.security[i] = NULL;
+
retval = security_msg_queue_alloc(msq);
if (retval) {
ipc_rcu_putref(msq);
Index: linux-2.6.10-rc1-bk12-stack/ipc/msgutil.c
===================================================================
--- linux-2.6.10-rc1-bk12-stack.orig/ipc/msgutil.c 2004-10-18
16:54:07.000000000 -0500
+++ linux-2.6.10-rc1-bk12-stack/ipc/msgutil.c 2004-11-02
19:57:14.757723192 -0600
@@ -31,6 +31,7 @@
struct msg_msgseg **pseg;
int err;
int alen;
+ int i;

alen = len;
if (alen > DATALEN_MSG)
@@ -41,7 +42,8 @@
return ERR_PTR(-ENOMEM);

msg->next = NULL;
- msg->security = NULL;
+ for (i=0; i<CONFIG_NUM_LSMS; i++)
+ msg->security[i] = NULL;

if (copy_from_user(msg + 1, src, alen)) {
err = -EFAULT;
Index: linux-2.6.10-rc1-bk12-stack/ipc/sem.c
===================================================================
--- linux-2.6.10-rc1-bk12-stack.orig/ipc/sem.c 2004-11-02
19:56:00.805965568 -0600
+++ linux-2.6.10-rc1-bk12-stack/ipc/sem.c 2004-11-02 19:57:14.758723040
-0600
@@ -161,6 +161,7 @@
int retval;
struct sem_array *sma;
int size;
+ int i;

if (!nsems)
return -EINVAL;
@@ -177,7 +178,9 @@
sma->sem_perm.mode = (semflg & S_IRWXUGO);
sma->sem_perm.key = key;

- sma->sem_perm.security = NULL;
+ for (i=0; i<CONFIG_NUM_LSMS; i++)
+ sma->sem_perm.security[i] = NULL;
+
retval = security_sem_alloc(sma);
if (retval) {
ipc_rcu_putref(sma);
Index: linux-2.6.10-rc1-bk12-stack/ipc/shm.c
===================================================================
--- linux-2.6.10-rc1-bk12-stack.orig/ipc/shm.c 2004-11-02
19:55:51.451387680 -0600
+++ linux-2.6.10-rc1-bk12-stack/ipc/shm.c 2004-11-02 19:57:14.758723040
-0600
@@ -181,6 +181,7 @@
struct file * file;
char name[13];
int id;
+ int i;

if (size < SHMMIN || size > shm_ctlmax)
return -EINVAL;
@@ -196,7 +197,9 @@
shp->shm_flags = (shmflg & S_IRWXUGO);
shp->mlock_user = NULL;

- shp->shm_perm.security = NULL;
+ for (i=0; i<CONFIG_NUM_LSMS; i++)
+ shp->shm_perm.security[i] = NULL;
+
error = security_shm_alloc(shp);
if (error) {
ipc_rcu_putref(shp);
Index: linux-2.6.10-rc1-bk12-stack/kernel/fork.c
===================================================================
--- linux-2.6.10-rc1-bk12-stack.orig/kernel/fork.c 2004-11-02
19:56:00.815964048 -0600
+++ linux-2.6.10-rc1-bk12-stack/kernel/fork.c 2004-11-02
19:57:14.759722888 -0600
@@ -789,6 +789,7 @@
{
int retval;
struct task_struct *p = NULL;
+ int i;

if ((clone_flags & (CLONE_NEWNS|CLONE_FS)) == (CLONE_NEWNS|CLONE_FS))
return ERR_PTR(-EINVAL);
@@ -871,7 +872,8 @@
p->utime = p->stime = 0;
p->lock_depth = -1; /* -1 = no lock */
do_posix_clock_monotonic_gettime(&p->start_time);
- p->security = NULL;
+ for (i=0; i<CONFIG_NUM_LSMS; i++)
+ p->security[i] = NULL;
p->io_context = NULL;
p->io_wait = NULL;
p->audit_context = NULL;
Index: linux-2.6.10-rc1-bk12-stack/security/Kconfig
===================================================================
--- linux-2.6.10-rc1-bk12-stack.orig/security/Kconfig 2004-11-02
19:55:53.582063768 -0600
+++ linux-2.6.10-rc1-bk12-stack/security/Kconfig 2004-11-02
19:57:14.759722888 -0600
@@ -44,6 +44,17 @@

If you are unsure how to answer this question, answer N.

+config NUM_LSMS
+ int "Number of security pointers to allocate"
+ depends on SECURITY
+ default "4"
+ help
+ Each LSM which annotates information with kernel objects
+ must have its own annotation entry. This option specifies
+ the number of required entries. It is safe to enter the
+ number of LSM's which you will load.
+
+
config SECURITY_NETWORK
bool "Socket and Networking Security Hooks"
depends on SECURITY

-
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