[PATCH 6/7] SLIM: debug output

From: Kylene Jo Hall
Date: Tue Sep 12 2006 - 13:55:33 EST

This patch contains all the necessary pieces to add debugging output to
SLIM.

Signed-off-by: Mimi Zohar <zohar@xxxxxxxxxx>
Signed-off-by: Kylene Hall <kjhall@xxxxxxxxxx>
---
security/slim/slim.h | 15 +
security/slim/slm_main.c | 356 +++++++++++++++++++++++++++++++-----
security/slim/slm_secfs.c | 103 ++++++++++
3 files changed, 429 insertions(+), 45 deletions(-)

--- linux-2.6.18-rc1-dbg/security/slim/slim.h 2006-07-21 15:36:52.000000000 -0500
+++ linux-2.6.18-rc1-dbg/security/slim/slim.h 2006-07-21 15:35:21.000000000 -0500
@@ -100,3 +100,18 @@ extern int slm_init_config(void);

extern __init int slm_init_secfs(void);
extern __exit void slm_cleanup_secfs(void);
+
+extern __init int slm_init_debugfs(void);
+extern __exit void slm_cleanup_debugfs(void);
+
+extern unsigned int slm_debug;
+enum slm_debug_level {
+ SLM_BASE = 1,
+ SLM_INTEGRITY = 2,
+ SLM_VERBOSE = 8,
+};
+
+#undef dprintk
+#define dprintk(level, format, a...) \
+ if (slm_debug & level) \
+ printk(KERN_INFO format, ##a)
--- linux-test/security/slim/slm_secfs.c 2006-09-06 11:14:07.000000000 -0700
+++ linux-test/security/slim/slm_secfs.c 2006-09-06 11:19:20.000000000 -0700
@@ -19,6 +19,7 @@
#include "slim.h"

static struct dentry *slim_sec_dir, *slim_level;
+static struct dentry *slim_debug_dir, *slim_integrity, *slim_verbose;

static ssize_t slm_read_level(struct file *file, char __user *buf,
size_t buflen, loff_t *ppos)
@@ -42,10 +44,76 @@ static ssize_t slm_read_level(struct fil
return simple_read_from_buffer(buf, buflen, ppos, data, len);
}

+static int slm_open_debug(struct inode *inode, struct file *file)
+{
+ if (inode->u.generic_ip)
+ file->private_data = inode->u.generic_ip;
+ return 0;
+}
+
+static ssize_t slm_read_debug(struct file *file, char __user * buf,
+ size_t buflen, loff_t * ppos)
+{
+ ssize_t len = 0;
+ enum slm_debug_level type = (enum slm_debug_level)file->private_data;
+ char *page = (char *)__get_free_page(GFP_KERNEL);
+
+ if (!page)
+ return -ENOMEM;
+
+ switch(type) {
+ case SLM_INTEGRITY:
+ len = sprintf(page, "slm_debug: integrity %s\n",
+ ((slm_debug & SLM_INTEGRITY) == SLM_INTEGRITY)
+ ? "ON" : "OFF");
+ break;
+ case SLM_VERBOSE:
+ len = sprintf(page, "evm_debug: verbose %s\n",
+ ((slm_debug & SLM_VERBOSE) == SLM_VERBOSE)
+ ? "ON" : "OFF");
+ break;
+ default:
+ break;
+ }
+ len = simple_read_from_buffer(buf, buflen, ppos, page, len);
+ free_page((unsigned long)page);
+ return len;
+}
+
+static ssize_t slm_write_debug(struct file *file, const char __user * buf,
+ size_t buflen, loff_t * ppos)
+{
+ char flag;
+ enum slm_debug_level type = (enum slm_debug_level)file->private_data;
+
+ if (copy_from_user(&flag, buf, 1))
+ return -EFAULT;
+
+ switch(type) {
+ case SLM_INTEGRITY:
+ slm_debug = (flag == '0') ? slm_debug & ~SLM_INTEGRITY :
+ slm_debug | SLM_INTEGRITY;
+ break;
+ case SLM_VERBOSE:
+ slm_debug = (flag == '0') ? slm_debug & ~SLM_VERBOSE :
+ slm_debug | SLM_VERBOSE;
+ break;
+ default:
+ break;
+ }
+ return buflen;
+}
+
static struct file_operations slm_level_ops = {
.read = slm_read_level,
};

+static struct file_operations slm_debug_ops = {
+ .read = slm_read_debug,
+ .write = slm_write_debug,
+ .open = slm_open_debug,
+};
+
int __init slm_init_secfs(void)
{
if (!slim_enabled)
@@ -65,9 +133,45 @@ int __init slm_init_secfs(void)

__initcall(slm_init_secfs);

+int __init slm_init_debugfs(void)
+{
+ if (!slim_enabled)
+ return 0;
+
+ slim_debug_dir = debugfs_create_dir("slim", NULL);
+ if (!slim_debug_dir || IS_ERR(slim_debug_dir))
+ return -EFAULT;
+
+ slim_integrity = debugfs_create_file("integrity", S_IRUSR | S_IRGRP,
+ slim_debug_dir, (void *)SLM_INTEGRITY,
+ &slm_debug_ops);
+ if (!slim_integrity || IS_ERR(slim_integrity))
+ goto out_del_debugdir;
+ slim_verbose = debugfs_create_file("verbose", S_IRUSR | S_IRGRP,
+ slim_debug_dir, (void *)SLM_VERBOSE,
+ &slm_debug_ops);
+ if (!slim_verbose || IS_ERR(slim_verbose))
+ goto out_del_integrity;
+ return 0;
+
+out_del_integrity:
+ debugfs_remove(slim_integrity);
+out_del_debugdir:
+ debugfs_remove(slim_debug_dir);
+ return -EFAULT;
+}
+
+__initcall(slm_init_debugfs);
+
void __exit slm_cleanup_secfs(void)
{
securityfs_remove(slim_level);
securityfs_remove(slim_sec_dir);
}

+void __exit slm_cleanup_debugfs(void)
+{
+ debugfs_remove(slim_verbose);
+ debugfs_remove(slim_integrity);
+ debugfs_remove(slim_debug_dir);
+}
--- linux-test/security/slim/slm_main.c 2006-09-06 10:46:22.000000000 -0700
+++ linux-test/security/slim/slm_main.c 2006-09-06 11:19:32.000000000 -0700
@@ -29,6 +29,7 @@

#include "slim.h"

+unsigned int slm_debug = SLM_BASE;
#define XATTR_NAME "security.slim.level"

#define ZERO_STR "0"
@@ -121,8 +122,13 @@ static inline int mark_has_file_wperm(st

isec = inode->i_security;
spin_lock(&isec->lock);
- if (is_lower_integrity(cur_level, &isec->level))
+ if (is_lower_integrity(cur_level, &isec->level)) {
rc = 1;
+ if (file->f_dentry->d_name.name)
+ dprintk(SLM_BASE, "pid %d - has write perm "
+ "for %s\n", current->pid,
+ file->f_dentry->d_name.name);
+ }
spin_unlock(&isec->lock);
return rc;
}
@@ -174,11 +180,18 @@ static inline void do_revoke_mmap_wperm(
unsigned long start = mpnt->vm_start;
unsigned long end = mpnt->vm_end;
size_t len = end - start;
+ struct dentry *dentry = mpnt->vm_file->f_dentry;

if ((mpnt->vm_flags & (VM_WRITE | VM_MAYWRITE))
&& (mpnt->vm_flags & VM_SHARED)
- && (cur_level->iac_level < isec->level.iac_level))
- do_mprotect(start, len, PROT_READ);
+ && (cur_level->iac_level < isec->level.iac_level)) {
+ dprintk(SLM_BASE,
+ "%s: pid %d - revoking write"
+ " perm for %s\n", __FUNCTION__,
+ current->pid, dentry->d_name.name);
+ if (do_mprotect(start, len, PROT_READ) < 0)
+ dprintk(SLM_BASE, "do_mprotect failed");
+ }
}

/*
@@ -305,11 +318,22 @@ static int slm_get_xattr(struct dentry *
rc = integrity_verify_metadata(dentry, XATTR_NAME,
&xattr_value, &xattr_len, status);

- if (rc >=0 && *status == INTEGRITY_PASS && xattr_value) {
+ if (rc < 0 && rc != -EOPNOTSUPP) {
+ dprintk(SLM_BASE,
+ "%s integrity_verify_metadata failed "
+ "(rc: %d - status: %d)\n",
+ dentry->d_name.name, rc, *status);
+
+ } else if (rc >=0 && *status == INTEGRITY_PASS && xattr_value) {
rc = slm_parse_xattr(xattr_value, xattr_len, level);
kfree(xattr_value);
- if (rc == 0 && level->iac_level != SLM_IAC_UNTRUSTED)
+ if (rc == 0 && level->iac_level != SLM_IAC_UNTRUSTED) {
rc = integrity_verify_data(dentry, status);
+ if ((rc < 0) || (*status != INTEGRITY_PASS))
+ dprintk(SLM_BASE, "%s integrity_verify_data failed "
+ " (rc: %d status: %d)\n", dentry->d_name.name,
+ rc, *status);
+ }
}
return rc;
}
@@ -348,9 +372,12 @@ static void update_sock_level(struct den
int rc, status = 0;

rc = slm_get_xattr(dentry, level, &status);
- if (rc == -EOPNOTSUPP)
+ if (rc == -EOPNOTSUPP) {
+ dprintk(SLM_INTEGRITY, "%s:%s - slm_get_xattr "
+ "not supported pid %d\n", __FUNCTION__,
+ dentry->d_name.name, current->pid);
set_level_exempt(level);
- else
+ } else
set_level_tsec_read(level, cur_tsec);
}

@@ -373,6 +400,8 @@ static void update_level(struct dentry *
switch(status) {
case INTEGRITY_FAIL:
case INTEGRITY_NOLABEL:
+ dprintk(SLM_INTEGRITY, "%s: %s FAIL/NOLABEL (%d)\n",
+ __FUNCTION__, dentry->d_name.name, rc);
set_level_untrusted(level);
break;
}
@@ -417,6 +446,8 @@ static void slm_get_level(struct dentry
spin_lock(&isec->lock);
memcpy(level, &isec->level, sizeof(struct slm_file_xattr));
spin_unlock(&isec->lock);
+ dprintk(SLM_VERBOSE, "%s: %s level %d \n", __FUNCTION__,
+ dentry->d_name.name, level->iac_level);
return;
}

@@ -445,6 +476,9 @@ static struct slm_tsec_data *slm_init_ta
return NULL;
tsec->lock = SPIN_LOCK_UNLOCKED;
if (!cur_tsec) {
+ dprintk(SLM_VERBOSE,
+ "%s: pid %d current->pid %d cur_tsec\n",
+ __FUNCTION__, tsk->pid, current->pid);
tsec->iac_r = SLM_IAC_HIGHEST - 1;
tsec->iac_wx = SLM_IAC_HIGHEST - 1;
} else
@@ -481,7 +515,10 @@ static int is_iac_greater_than_or_exempt
* Permit process to read file of equal or greater integrity
* otherwise, demote the process.
*/
-static int enforce_integrity_read(struct slm_file_xattr *level)
+static int enforce_integrity_read(struct slm_file_xattr *level,
+ const unsigned char *name,
+ struct task_struct *parent_tsk,
+ struct slm_tsec_data *parent_tsec)
{
struct slm_tsec_data *cur_tsec = current->security;
int rc = 0;
@@ -491,10 +528,31 @@ static int enforce_integrity_read(struct
rc = has_file_wperm(level);
if (atomic_read(&current->mm->mm_users) != 1)
rc = 1;
- if (rc)
+ if (rc) {
+ dprintk(SLM_BASE, "ppid %d(%s p=%d-%s) "
+ " pid %d(%s p=%d-%s) can't revoke, not demoting\n",
+ parent_tsk->pid, parent_tsk->comm,
+ parent_tsec->iac_r,
+ (parent_tsec->iac_wx != parent_tsec->iac_r)
+ ? "GUARD" : slm_iac_str[parent_tsec-> iac_r],
+ current->pid, current->comm,
+ cur_tsec->iac_r, (cur_tsec->iac_wx != cur_tsec->iac_r)
+ ? "GUARD" : slm_iac_str[cur_tsec->iac_r]);
spin_unlock(&cur_tsec->lock);
- else {
+ } else {
/* Reading lower integrity, demote process */
+ dprintk(SLM_BASE, "ppid %d(%s p=%d-%s) "
+ " pid %d(%s p=%d-%s) demoting integrity to"
+ " iac=%d-%s(%s)\n",
+ parent_tsk->pid, parent_tsk->comm,
+ parent_tsec->iac_r,
+ (parent_tsec->iac_wx != parent_tsec->iac_r)
+ ? "GUARD" : slm_iac_str[parent_tsec-> iac_r],
+ current->pid, current->comm,
+ cur_tsec->iac_r, (cur_tsec->iac_wx != cur_tsec->iac_r)
+ ? "GUARD" : slm_iac_str[cur_tsec->iac_r],
+ level->iac_level, slm_iac_str[level->iac_level], name);
+
/* Even in the case of a integrity guard process. */
cur_tsec->iac_r = level->iac_level;
cur_tsec->iac_wx = level->iac_level;
@@ -507,42 +565,82 @@ static int enforce_integrity_read(struct
return 0;
}

-static int do_task_may_read(struct slm_file_xattr *level)
+static int do_task_may_read(struct slm_file_xattr *level,
+ const unsigned char *name,
+ struct task_struct *parent_tsk,
+ struct slm_tsec_data *parent_tsec)
{
- return enforce_integrity_read(level);
+ return enforce_integrity_read(level, name, parent_tsk, parent_tsec);
}

/*
* enforce: IWXAC(process) >= IAC(object)
* Permit process to write a file of equal or lesser integrity.
*/
-static int enforce_integrity_write(struct slm_file_xattr *level)
+static int enforce_integrity_write(struct slm_file_xattr *level,
+ const unsigned char *name,
+ struct task_struct *parent_tsk,
+ struct slm_tsec_data *parent_tsec)
{
struct slm_tsec_data *cur_tsec = current->security;
int rc = 0;

spin_lock(&cur_tsec->lock);
if (!(is_iac_greater_than_or_exempt(level, cur_tsec->iac_wx)
- || (level->iac_level == SLM_IAC_NOTDEFINED)))
+ || (level->iac_level == SLM_IAC_NOTDEFINED))) {
/* can't write higher integrity */
+ dprintk(SLM_BASE, "ppid %d(%s p=%d-%s) "
+ "pid %d(%s p=%d-%s) can't write higher "
+ "integrity iac=%d-%s(%s)\n",
+ parent_tsk->pid, parent_tsk->comm,
+ parent_tsec->iac_wx,
+ (parent_tsec->iac_wx != parent_tsec->iac_r)
+ ? "GUARD" : slm_iac_str[parent_tsec->
+ iac_wx],
+ current->pid, current->comm,
+ cur_tsec->iac_wx, (cur_tsec->iac_wx != cur_tsec->iac_r)
+ ? "GUARD" : slm_iac_str[cur_tsec->iac_wx],
+ level->iac_level, slm_iac_str[level->iac_level], name);
rc = -EACCES;
+ }
spin_unlock(&cur_tsec->lock);
return rc;
}

-static int do_task_may_write(struct slm_file_xattr *level)
+static int do_task_may_write(struct slm_file_xattr *level,
+ const unsigned char *name,
+ struct task_struct *parent_tsk,
+ struct slm_tsec_data *parent_tsec)
{
- return enforce_integrity_write(level);
+ return enforce_integrity_write(level, name, parent_tsk, parent_tsec);
}

-static int slm_set_taskperm(int mask, struct slm_file_xattr *level)
+static int slm_set_taskperm(int mask, struct slm_file_xattr *level,
+ const unsigned char *name)
{
+ struct task_struct *parent_tsk = current->parent, new_tsk;
+ struct slm_tsec_data *parent_tsec = NULL, new_tsec;
int rc = 0;

+ if (parent_tsk)
+ parent_tsec = parent_tsk->security;
+ else {
+ printk(KERN_INFO
+ "%s: current pid %d: parent_tsk is null\n",
+ __FUNCTION__, current->pid);
+ memset(&new_tsk, 0, sizeof(struct task_struct));
+ parent_tsk = &new_tsk;
+ }
+
+ if (!parent_tsec) {
+ memset(&new_tsec, 0, sizeof(struct slm_tsec_data));
+ parent_tsec = &new_tsec;
+ }
+
if (mask & MAY_READ)
- rc = do_task_may_read(level);
+ rc = do_task_may_read(level, name, parent_tsk, parent_tsec);
if ((mask & MAY_WRITE) || (mask & MAY_APPEND))
- rc |= do_task_may_write(level);
+ rc |= do_task_may_write(level, name, parent_tsk, parent_tsec);

return rc;
}
@@ -562,15 +660,21 @@ static int slm_file_permission(struct fi
return 0;
}

-static int is_untrusted_blk_access(struct inode *inode)
+static int is_untrusted_blk_access(struct inode *inode,
+ const unsigned char *fname)
{
struct slm_tsec_data *cur_tsec = current->security;
int rc = 0;

spin_lock(&cur_tsec->lock);
if (cur_tsec && (cur_tsec->iac_wx == SLM_IAC_UNTRUSTED)
- && S_ISBLK(inode->i_mode))
+ && S_ISBLK(inode->i_mode)) {
+ dprintk(SLM_BASE, "pid %d(%s p=%d-%s) deny access %s\n",
+ current->pid, current->comm,
+ cur_tsec->iac_wx, (cur_tsec->iac_wx != cur_tsec->iac_r)
+ ? "GUARD" : slm_iac_str[cur_tsec->iac_wx], fname);
rc = 1;
+ }
spin_unlock(&cur_tsec->lock);
return rc;
}
@@ -583,8 +687,11 @@ static int is_untrusted_blk_access(struc
static int slm_inode_permission(struct inode *inode, int mask,
struct nameidata *nd)
{
+ char *path = NULL;
+ const unsigned char *fname = NULL;
struct dentry *dentry = NULL;
struct slm_file_xattr level;
+ int rc = 0;

if (S_ISDIR(inode->i_mode) && (mask & MAY_WRITE))
return 0;
@@ -593,16 +700,33 @@ static int slm_inode_permission(struct i
if (!dentry)
return 0;

- if (is_untrusted_blk_access(inode))
- return -EPERM;
+ if (nd) { /* preferably use fullname */
+ path = (char *)__get_free_page(GFP_KERNEL);
+ if (path)
+ fname = d_path(nd->dentry, nd->mnt, path, PAGE_SIZE);
+ }
+
+ if (!fname) /* no choice, use short name */
+ fname = (!dentry->d_name.name) ? dentry->d_iname :
+ dentry->d_name.name;
+
+ if (is_untrusted_blk_access(inode, fname)) {
+ rc = -EPERM;
+ goto out;
+ }

slm_get_level(dentry, &level);

/* measure all SYSTEM level integrity objects */
if (level.iac_level == SLM_IAC_SYSTEM)
- integrity_measure(dentry, NULL, mask);
+ integrity_measure(dentry, fname, mask);

- return slm_set_taskperm(mask, &level);
+ rc = slm_set_taskperm(mask, &level, fname);
+
+out:
+ if (path)
+ free_page((unsigned long)path);
+ return rc;
}

/*
@@ -616,7 +740,7 @@ static int slm_inode_unlink(struct inode
return 0;

slm_get_level(dentry, &level);
- return slm_set_taskperm(MAY_WRITE, &level);
+ return slm_set_taskperm(MAY_WRITE, &level, dentry->d_name.name);
}

static void slm_inode_free_security(struct inode *inode)
@@ -644,8 +768,15 @@ static int slm_inode_create(struct inode
*/
spin_lock(&cur_tsec->lock);
spin_lock(&parent_isec->lock);
- if (!is_iac_greater_than_or_exempt(parent_level, cur_tsec->iac_wx))
+ if (!is_iac_greater_than_or_exempt(parent_level, cur_tsec->iac_wx)) {
+ dprintk(SLM_INTEGRITY, "%s: prohibit current %s level "
+ "process writing into %s (%s level directory)\n",
+ __FUNCTION__, slm_iac_str[cur_tsec->iac_wx],
+ (!dentry->d_name.name)
+ ? " " : (char *)dentry->d_name.name,
+ slm_iac_str[parent_level->iac_level]);
rc = -EPERM;
+ }
spin_unlock(&parent_isec->lock);
spin_unlock(&cur_tsec->lock);
return rc;
@@ -713,6 +844,8 @@ static int slm_inode_init_security(struc
spin_lock(&parent_isec->lock);
memcpy(&level, &parent_isec->level,
sizeof(struct slm_file_xattr));
+ dprintk(SLM_VERBOSE, "%s: level %d\n", __FUNCTION__,
+ parent_isec->level.iac_level);
spin_unlock(&parent_isec->lock);
}

@@ -793,9 +926,17 @@ static int slm_inode_mkdir(struct inode

spin_lock(&cur_tsec->lock);
spin_lock(&parent_isec->lock);
- if (cur_tsec->iac_wx < parent_level->iac_level
- && parent_level->iac_level == SLM_IAC_SYSTEM)
- rc = -EACCES;
+ if (cur_tsec->iac_wx < parent_level->iac_level) {
+ if (parent_level->iac_level == SLM_IAC_SYSTEM)
+ rc = -EACCES;
+ else
+ dprintk(SLM_VERBOSE, "%s:ppid %d (%s) %s - creating"
+ " lower integrity directory, than parent\n",
+ __FUNCTION__, current->pid, current->comm,
+ (!dentry->d_name.name)
+ ? "" : (char *)dentry->d_name.name);
+
+ }
spin_unlock(&parent_isec->lock);
spin_unlock(&cur_tsec->lock);
return rc;
@@ -817,8 +958,13 @@ static int slm_inode_rename(struct inode
slm_get_level(parent_dentry, &parent_level);
dput(parent_dentry);

- if (is_lower_integrity(&old_level, &parent_level))
+ if (is_lower_integrity(&old_level, &parent_level)) {
+ dprintk(SLM_BASE, "%s: prohibit rename of %s (low"
+ " integrity) into %s (higher level directory)\n",
+ __FUNCTION__, old_dentry->d_name.name,
+ parent_dentry->d_name.name);
return -EPERM;
+ }
return 0;
}

@@ -840,6 +986,10 @@ int slm_inode_setxattr(struct dentry *de
if (!value)
return -EINVAL;

+ dprintk(SLM_VERBOSE, "%s: name %s value %s process:iac_r %s "
+ "iac_wx %s\n", __FUNCTION__, name, (char *)value,
+ slm_iac_str[cur_tsec->iac_r], slm_iac_str[cur_tsec->iac_wx]);
+
spin_lock(&cur_tsec->lock);
iac = cur_tsec->iac_wx;
spin_unlock(&cur_tsec->lock);
@@ -950,9 +1100,18 @@ int slm_socket_create(int family, int ty
if (atomic_read(&current->mm->mm_users) != 1)
rc = 1;
if (rc) {
+ dprintk(SLM_BASE,
+ "%s: ppid %d pid %d can't revoke, refusing socket\n",
+ __FUNCTION__, parent_tsk->pid, current->pid);
spin_unlock(&cur_tsec->lock);
return -EPERM;
} else {
+ dprintk(SLM_INTEGRITY,
+ "%s: ppid %d pid %d demoting "
+ "family %d type %d protocol %d kern %d"
+ " to untrusted.\n", __FUNCTION__,
+ parent_tsk->pid, current->pid, family,
+ type, protocol, kern);
cur_tsec->iac_r = SLM_IAC_UNTRUSTED;
cur_tsec->iac_wx = SLM_IAC_UNTRUSTED;
spin_unlock(&cur_tsec->lock);
@@ -1039,16 +1198,37 @@ static int slm_task_post_setuid(uid_t ol

if (cur_tsec && flags == LSM_SETID_ID) {
/*set process to USER level integrity for everything but root */
+ dprintk(SLM_VERBOSE, "ruid %d euid %d suid %d "
+ "cur: uid %d euid %d suid %d\n",
+ old_ruid, old_euid, old_suid,
+ current->uid, current->euid, current->suid);
spin_lock(&cur_tsec->lock);
if ((cur_tsec->iac_r == cur_tsec->iac_wx)
- && (cur_tsec->iac_r == SLM_IAC_UNTRUSTED));
- else if (current->suid != 0) {
+ && (cur_tsec->iac_r == SLM_IAC_UNTRUSTED)) {
+ dprintk(SLM_INTEGRITY,
+ "Integrity: pid %d iac_r %d "
+ " iac_wx %d remains UNTRUSTED\n",
+ current->pid, cur_tsec->iac_r,
+ cur_tsec->iac_wx);
+ } else if (current->suid != 0) {
+ dprintk(SLM_INTEGRITY, "setting: pid %d iac_r %d "
+ " iac_wx %d to USER\n",
+ current->pid, cur_tsec->iac_r,
+ cur_tsec->iac_wx);
cur_tsec->iac_r = SLM_IAC_USER;
cur_tsec->iac_wx = SLM_IAC_USER;
} else if ((current->uid == 0) && (old_ruid != 0)) {
+ dprintk(SLM_INTEGRITY, "setting: pid %d iac_r %d "
+ " iac_wx %d to SYSTEM\n",
+ current->pid, cur_tsec->iac_r,
+ cur_tsec->iac_wx);
cur_tsec->iac_r = SLM_IAC_SYSTEM;
cur_tsec->iac_wx = SLM_IAC_SYSTEM;
- }
+ } else
+ dprintk(SLM_INTEGRITY, "%s: pid %d iac_r %d "
+ " iac_wx %d \n", __FUNCTION__,
+ current->pid, cur_tsec->iac_r,
+ cur_tsec->iac_wx);
spin_unlock(&cur_tsec->lock);
}
return 0;
@@ -1057,6 +1237,7 @@ static int slm_task_post_setuid(uid_t ol
static inline int slm_setprocattr(struct task_struct *tsk,
char *name, void *value, size_t size)
{
+ dprintk(SLM_BASE, "%s: %s \n", __FUNCTION__, name);
return -EACCES;

}
@@ -1096,16 +1277,60 @@ static int enforce_integrity_execute(str
int rc = 0;

spin_lock(&cur_tsec->lock);
- if (is_iac_less_than_or_exempt(level, cur_tsec->iac_wx))
+ if (is_iac_less_than_or_exempt(level, cur_tsec->iac_wx)) {
+ dprintk(SLM_INTEGRITY,
+ "%s: ppid %d(%s %d-%s) pid %d(%s %d-%s)"
+ " %s executing\n",
+ __FUNCTION__, parent_tsk->pid,
+ parent_tsk->comm,
+ (!parent_tsec) ? 0 : parent_tsec->iac_wx,
+ (parent_tsec->iac_wx != parent_tsec->iac_r)
+ ? "GUARD" : slm_iac_str[parent_tsec->
+ iac_wx],
+ current->pid, current->comm,
+ cur_tsec->iac_wx,
+ (cur_tsec->iac_wx != cur_tsec->iac_r)
+ ? "GUARD" : slm_iac_str[cur_tsec->iac_wx],
+ bprm->filename);
+
/* Being a guard process is not inherited */
cur_tsec->iac_r = cur_tsec->iac_wx;
- else {
+ } else {
rc = has_file_wperm(level);
if (atomic_read(&current->mm->mm_users) != 1)
rc = 1;
- if (rc)
+ if (rc) {
+ dprintk(SLM_BASE,
+ "%s: ppid %d(%s %d-%s) pid %d(%s %d-%s)"
+ " %s can't revoke, deny execution\n",
+ __FUNCTION__, parent_tsk->pid,
+ parent_tsk->comm, parent_tsec->iac_wx,
+ (parent_tsec->iac_wx != parent_tsec->iac_r)
+ ? "GUARD" : slm_iac_str[parent_tsec->
+ iac_wx],
+ current->pid, current->comm,
+ cur_tsec->iac_wx,
+ (cur_tsec->iac_wx != cur_tsec->iac_r)
+ ? "GUARD" : slm_iac_str[cur_tsec->iac_wx],
+ bprm->filename);
spin_unlock(&cur_tsec->lock);
- else {
+ } else {
+ dprintk(SLM_BASE,
+ "%s: ppid %d(%s %d-%s) pid %d(%s %d-%s)"
+ " %s executing, demoting integrity to "
+ " iac=%d-%s\n",
+ __FUNCTION__, parent_tsk->pid,
+ parent_tsk->comm, parent_tsec->iac_wx,
+ (parent_tsec->iac_wx != parent_tsec->iac_r)
+ ? "GUARD" : slm_iac_str[parent_tsec->
+ iac_wx],
+ current->pid, current->comm,
+ cur_tsec->iac_wx,
+ (cur_tsec->iac_wx != cur_tsec->iac_r)
+ ? "GUARD" : slm_iac_str[cur_tsec->iac_wx],
+ bprm->filename, level->iac_level,
+ slm_iac_str[level->iac_level]);
+
cur_tsec->iac_r = level->iac_level;
cur_tsec->iac_wx = level->iac_level;
spin_unlock(&cur_tsec->lock);
@@ -1121,9 +1346,25 @@ static void enforce_guard_integrity_exec
struct slm_file_xattr *level,
struct slm_tsec_data *cur_tsec)
{
+ struct task_struct *parent_tsk = current->parent;
+
if ((strcmp(bprm->filename, bprm->interp) != 0)
- && (level->guard.unlimited))
+ && (level->guard.unlimited)) {
+ dprintk(SLM_INTEGRITY, "%s:pid %d %s prohibiting "
+ "script from being an unlimited guard\n",
+ __FUNCTION__, current->pid, bprm->filename);
level->guard.unlimited = 0;
+ }
+
+ dprintk(SLM_INTEGRITY,
+ "%s: ppid %d pid %d %s (integrity guard)"
+ "cur: r %s wx %s new: r %s wx %s %s\n",
+ __FUNCTION__, parent_tsk->pid, current->pid,
+ bprm->filename, slm_iac_str[cur_tsec->iac_r],
+ slm_iac_str[cur_tsec->iac_wx],
+ slm_iac_str[level->guard.iac_r],
+ slm_iac_str[level->guard.iac_wx],
+ (level->guard.unlimited ? "unlimited" : "limited"));

spin_lock(&cur_tsec->lock);
if (level->guard.unlimited) {
@@ -1153,7 +1394,13 @@ static int slm_bprm_check_security(struc
/* Special case interpreters */
spin_lock(&cur_tsec->lock);
if (strcmp(bprm->filename, bprm->interp) != 0) {
+ dprintk(SLM_INTEGRITY,
+ "%s: executing %s (interp: %s)\n",
+ __FUNCTION__, bprm->filename, bprm->interp);
if (!cur_tsec->script_dentry) {
+ dprintk(SLM_INTEGRITY,
+ "%s: NULL script_dentry %s\n",
+ __FUNCTION__, bprm->filename);
spin_unlock(&cur_tsec->lock);
return 0;
} else
@@ -1165,6 +1412,9 @@ static int slm_bprm_check_security(struc
spin_unlock(&cur_tsec->lock);

slm_get_level(dentry, &level);
+ dprintk(SLM_INTEGRITY, "%s: %s level iac %d - %s\n",
+ __FUNCTION__, bprm->filename, level.iac_level,
+ slm_iac_str[level.iac_level]);

/* slm_inode_permission measured all SYSTEM level integrity objects */
if (level.iac_level != SLM_IAC_SYSTEM)
@@ -1177,10 +1427,17 @@ static int slm_bprm_check_security(struc

switch(status) {
case INTEGRITY_FAIL:
- if (!is_kernel_thread(current))
+ if (!is_kernel_thread(current)) {
+ dprintk(SLM_BASE,
+ "%s: %s (Integrity status: FAIL)\n",
+ __FUNCTION__, bprm->filename);
return -EACCES;
+ }
break;
case INTEGRITY_NOLABEL:
+ dprintk(SLM_BASE,
+ "%s: %s (Integrity status: NOLABEL)\n",
+ __FUNCTION__, bprm->filename);
level.iac_level = SLM_IAC_UNTRUSTED;
}

@@ -1215,9 +1472,12 @@ static inline int slm_capable(struct tas
/* Derived from include/linux/sched.h:capable. */
if (cap_raised(tsk->cap_effective, cap)) {
spin_lock(&tsec->lock);
- if (tsec->iac_wx == SLM_IAC_UNTRUSTED &&
- cap == CAP_SYS_ADMIN)
- rc = -EACCES;
+ if (tsec->iac_wx == SLM_IAC_UNTRUSTED) {
+ dprintk(SLM_VERBOSE, "%s: pid %d %s requested cap %d\n",
+ __FUNCTION__, tsk->pid, tsk->comm, cap);
+ if (cap == CAP_SYS_ADMIN)
+ rc = -EACCES;
+ }
spin_unlock(&tsec->lock);
return rc;
}
@@ -1255,6 +1515,8 @@ static int slm_shm_alloc_security(struct
set_level_tsec_write(&isec->level, cur_tsec);
spin_unlock(&cur_tsec->lock);
perm->security = isec;
+ dprintk(SLM_INTEGRITY, "%s: level %d \n", __FUNCTION__,
+ isec->level.iac_level);

return 0;
}
@@ -1290,7 +1552,7 @@ static int slm_shm_shmctl(struct shmid_k
inode = dentry->d_inode;

spin_lock(&perm_isec->lock);
- rc = slm_set_taskperm(MAY_READ | MAY_WRITE, &perm_isec->level);
+ rc = slm_set_taskperm(MAY_READ | MAY_WRITE, &perm_isec->level, NULL);
spin_unlock(&perm_isec->lock);
return rc;
}
@@ -1314,8 +1576,12 @@ static int slm_shm_shmat(struct shmid_ke
mask |= MAY_WRITE;

spin_lock(&perm_isec->lock);
- rc = slm_set_taskperm(mask, &perm_isec->level);
+ rc = slm_set_taskperm(mask, &perm_isec->level, NULL);

+ dprintk(SLM_INTEGRITY,
+ "%s: %d mask %d level %d replace %d\n",
+ __FUNCTION__, shp->id, mask,
+ perm_isec->level.iac_level, isec->level.iac_level);
spin_lock(&isec->lock);
memcpy(&isec->level, &perm_isec->level, sizeof(struct slm_file_xattr));
spin_unlock(&perm_isec->lock);


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