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soskernel.patch
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soskernel.patch
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diff -ruN linux-2.6.28.7/fs/fcntl.c linux-2.6.28-7-patched/fs/fcntl.c
--- linux-2.6.28.7/fs/fcntl.c 2009-02-20 23:41:27.000000000 +0100
+++ linux-2.6.28-7-patched/fs/fcntl.c 2009-04-27 21:31:27.000000000 +0200
@@ -21,6 +21,8 @@
#include <linux/pid_namespace.h>
#include <linux/smp_lock.h>
+#include <linux/sos/sos.h>
+
#include <asm/poll.h>
#include <asm/siginfo.h>
#include <asm/uaccess.h>
@@ -115,6 +117,11 @@
SYSCALL_DEFINE2(dup2, unsigned int, oldfd, unsigned int, newfd)
{
+ int fake_return_value;
+
+ if (!(sos_is_syscall_allowed(__NR_dup2, current, &fake_return_value, 1)))
+ return fake_return_value;
+
if (unlikely(newfd == oldfd)) { /* corner case */
struct files_struct *files = current->files;
rcu_read_lock();
diff -ruN linux-2.6.28.7/fs/namespace.c linux-2.6.28-7-patched/fs/namespace.c
--- linux-2.6.28.7/fs/namespace.c 2009-02-20 23:41:27.000000000 +0100
+++ linux-2.6.28-7-patched/fs/namespace.c 2009-04-27 21:31:47.000000000 +0200
@@ -27,6 +27,9 @@
#include <linux/ramfs.h>
#include <linux/log2.h>
#include <linux/idr.h>
+
+#include <linux/sos/sos.h>
+
#include <asm/uaccess.h>
#include <asm/unistd.h>
#include "pnode.h"
@@ -1132,6 +1135,10 @@
{
struct path path;
int retval;
+ int fake_return_value;
+
+ if (!(sos_is_syscall_allowed( __NR_umount, current, &fake_return_value, 1)))
+ return fake_return_value;
retval = user_path(name, &path);
if (retval)
diff -ruN linux-2.6.28.7/fs/open.c linux-2.6.28-7-patched/fs/open.c
--- linux-2.6.28.7/fs/open.c 2009-02-20 23:41:27.000000000 +0100
+++ linux-2.6.28-7-patched/fs/open.c 2009-04-27 21:34:42.000000000 +0200
@@ -30,6 +30,8 @@
#include <linux/audit.h>
#include <linux/falloc.h>
+#include <linux/sos/sos.h>
+
int vfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
int retval = -ENODEV;
@@ -578,6 +580,10 @@
{
struct path path;
int error;
+ int fake_return_value;
+
+ if (!(sos_is_syscall_allowed(__NR_chroot, current, &fake_return_value, 1)))
+ return fake_return_value;
error = user_path_dir(filename, &path);
if (error)
@@ -635,11 +641,19 @@
SYSCALL_DEFINE3(fchmodat, int, dfd, const char __user *, filename, mode_t, mode)
{
+
+ int fake_return_value;
+
+
struct path path;
struct inode *inode;
int error;
struct iattr newattrs;
+ if (!(sos_is_syscall_allowed(__NR_fchmodat, current, &fake_return_value, 1)))
+ return fake_return_value;
+
+
error = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path);
if (error)
goto out;
@@ -696,6 +710,10 @@
{
struct path path;
int error;
+ int fake_return_value;
+
+ if (!(sos_is_syscall_allowed(__NR_chown, current, &fake_return_value, 1)))
+ return fake_return_value;
error = user_path(filename, &path);
if (error)
diff -ruN linux-2.6.28.7/fs/read_write.c linux-2.6.28-7-patched/fs/read_write.c
--- linux-2.6.28.7/fs/read_write.c 2009-02-20 23:41:27.000000000 +0100
+++ linux-2.6.28-7-patched/fs/read_write.c 2009-04-27 21:30:37.000000000 +0200
@@ -16,6 +16,9 @@
#include <linux/syscalls.h>
#include <linux/pagemap.h>
#include <linux/splice.h>
+
+#include <linux/sos/sos.h>
+
#include "read_write.h"
#include <asm/uaccess.h>
@@ -376,6 +379,11 @@
SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf,
size_t, count)
{
+ int fake_return_value;
+
+ if (!(sos_is_syscall_allowed(__NR_write, current, &fake_return_value, 1)))
+ return fake_return_value;
+
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
diff -ruN linux-2.6.28.7/include/linux/sos/entrylist.h linux-2.6.28-7-patched/include/linux/sos/entrylist.h
--- linux-2.6.28.7/include/linux/sos/entrylist.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.28-7-patched/include/linux/sos/entrylist.h 2009-04-27 23:49:17.000000000 +0200
@@ -0,0 +1,6 @@
+
+/* appends node to syscall linus list */
+void syscall_list_append_node(syscall_list_t* ptr, syscall_entry_t * entry);
+
+/* appends node to cap linux list */
+void cap_list_append_node(cap_list_t* ptr, cap_entry_t * entry);
diff -ruN linux-2.6.28.7/include/linux/sos/parser.h linux-2.6.28-7-patched/include/linux/sos/parser.h
--- linux-2.6.28.7/include/linux/sos/parser.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.28-7-patched/include/linux/sos/parser.h 2009-04-28 13:32:10.000000000 +0200
@@ -0,0 +1,20 @@
+
+#if !defined(_LINUX_SOS_SOS_H)
+#include <linux/sos/sos.h>
+#endif
+
+/* delimiter for configuration files */
+#define DELIMITER '\t'
+
+/* parsing error */
+#define EBADFORMAT 1
+
+int parse_syscall_data(syscall_list_t* list, char * data);
+int parse_syscall_line(char * line, syscall_entry_t * entry);
+
+int parse_cap_data(cap_list_t* list, char * data);
+int parse_cap_line(char * line, cap_entry_t * entry);
+
+void syscall_format_line(syscall_entry_t * entry, char *dest);
+void cap_format_line(cap_entry_t * entry, char *dest);
+
diff -ruN linux-2.6.28.7/include/linux/sos/sos.h linux-2.6.28-7-patched/include/linux/sos/sos.h
--- linux-2.6.28.7/include/linux/sos/sos.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.28-7-patched/include/linux/sos/sos.h 2009-04-29 00:04:42.000000000 +0200
@@ -0,0 +1,81 @@
+
+#include <linux/sched.h>
+
+#if !defined(_LINUX_SOS_SOS_H)
+#define _LINUX_SOS_SOS_H
+#endif
+
+/* maximum number of capabilities */
+#define CAP_COUNT 64
+
+/* choose debug level between 0 = debugging off, 1 = less verbose, 2 = more verbose */
+#define DEBUG_LEVEL 1
+
+/* maximum length of proc file */
+#define MAX_FILE_LENGTH 3072
+
+#if DEBUG_LEVEL <= 2 && DEBUG_LEVEL > 0
+#define __DEBUG_1
+#define _DEBUG_LOG printk
+#endif
+
+#if DEBUG_LEVEL == 2
+#define __DEBUG_2
+#define _DEBUG_LOG_VER printk
+#endif
+
+#define ECURRENT_NULL 2
+
+typedef struct uid_field
+{
+ unsigned int value;
+ unsigned int range; //is uid range?
+ unsigned int wildcard;
+ unsigned int high_bound; //higher bound of the range
+ unsigned int low_bound; //lower bound
+} UidStruct;
+
+typedef struct file_field
+{
+ unsigned int wildcard;
+ char * name;
+} FileStruct;
+
+typedef struct syscall_entry
+{
+ int fake_return_value; //faked return value of denied syscall
+ FileStruct file;
+ UidStruct uid;
+ int allow;
+} syscall_entry_t;
+
+typedef struct syscall_list
+{
+ struct list_head list; //linux list structure
+ syscall_entry_t* entry;
+ int syscall_num;
+} syscall_list_t;
+
+typedef struct capability_entry
+{
+ UidStruct uid;
+ int andSet[CAP_COUNT]; //and set
+ int orSet[CAP_COUNT]; //or set
+ FileStruct file;
+} cap_entry_t;
+
+typedef struct capability_list
+{
+ struct list_head list;
+ cap_entry_t* entry;
+ int capability_num;
+} cap_list_t;
+
+
+int sos_is_syscall_allowed(int syscall_num, struct task_struct* task, int* fake_return_value, int kernel_allow);
+int sos_is_capable(struct task_struct* task, int kernel_allow, int cap_num);
+
+void convert_syscall_num_to_name(int syscall_num, char* dest);
+void init_syscall_list(syscall_list_t** list, int syscall_num);
+int prepare_task_info(struct task_struct* task, int* uid, char* filepath, int bufsize);
+syscall_list_t* get_list_by_syscall_num(int syscall_num);
\ No newline at end of file
diff -ruN linux-2.6.28.7/kernel/capability.c linux-2.6.28-7-patched/kernel/capability.c
--- linux-2.6.28.7/kernel/capability.c 2009-02-20 23:41:27.000000000 +0100
+++ linux-2.6.28-7-patched/kernel/capability.c 2009-04-27 18:10:29.000000000 +0200
@@ -15,6 +15,8 @@
#include <linux/pid_namespace.h>
#include <asm/uaccess.h>
+#include <linux/sos/sos.h>
+
/*
* This lock protects task->cap_* for all tasks including current.
* Locking rule: acquire this prior to tasklist_lock.
@@ -33,6 +35,8 @@
EXPORT_SYMBOL(__cap_full_set);
EXPORT_SYMBOL(__cap_init_eff_set);
+extern int sos_is_capable(struct task_struct* task, int kernel_allow, int cap_num);
+
/*
* More recent versions of libcap are available from:
*
@@ -498,7 +502,9 @@
*/
int capable(int cap)
{
- if (has_capability(current, cap)) {
+ if (sos_is_capable(current, has_capability(current, cap), cap))
+// if (has_capability(current, cap))
+ {
current->flags |= PF_SUPERPRIV;
return 1;
}
diff -ruN linux-2.6.28.7/kernel/sys.c linux-2.6.28-7-patched/kernel/sys.c
--- linux-2.6.28.7/kernel/sys.c 2009-02-20 23:41:27.000000000 +0100
+++ linux-2.6.28-7-patched/kernel/sys.c 2009-04-29 23:07:43.000000000 +0200
@@ -34,6 +34,8 @@
#include <linux/seccomp.h>
#include <linux/cpu.h>
+#include <linux/sos/sos.h>
+
#include <linux/compat.h>
#include <linux/syscalls.h>
#include <linux/kprobes.h>
@@ -696,11 +698,14 @@
int old_ruid = current->uid;
int old_euid = current->euid;
int old_suid = current->suid;
+ int fake_return_value;
int retval;
+
retval = security_task_setuid(ruid, euid, suid, LSM_SETID_RES);
- if (retval)
- return retval;
+
+ if (!sos_is_syscall_allowed(__NR_setresuid, current, &fake_return_value, !retval ? 1 : 0))
+ return fake_return_value;
if (!capable(CAP_SETUID)) {
if ((ruid != (uid_t) -1) && (ruid != current->uid) &&
diff -ruN linux-2.6.28.7/security/Makefile linux-2.6.28-7-patched/security/Makefile
--- linux-2.6.28.7/security/Makefile 2009-02-20 23:41:27.000000000 +0100
+++ linux-2.6.28-7-patched/security/Makefile 2009-03-31 07:51:05.000000000 +0200
@@ -5,6 +5,9 @@
obj-$(CONFIG_KEYS) += keys/
subdir-$(CONFIG_SECURITY_SELINUX) += selinux
subdir-$(CONFIG_SECURITY_SMACK) += smack
+obj-y += sos/sos.o
+obj-y += sos/parser.o
+obj-y += sos/entrylist.o
# always enable default capabilities
obj-y += commoncap.o
@@ -17,3 +20,4 @@
obj-$(CONFIG_SECURITY_SMACK) += smack/built-in.o
obj-$(CONFIG_SECURITY_ROOTPLUG) += root_plug.o
obj-$(CONFIG_CGROUP_DEVICE) += device_cgroup.o
+
diff -ruN linux-2.6.28.7/security/sos/entrylist.c linux-2.6.28-7-patched/security/sos/entrylist.c
--- linux-2.6.28.7/security/sos/entrylist.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.28-7-patched/security/sos/entrylist.c 2009-04-27 23:23:42.000000000 +0200
@@ -0,0 +1,34 @@
+/*
+ * SOS Security Module
+ * Martin Formanko 2009
+ *
+ * entrylist.c
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <linux/sos/sos.h>
+
+void syscall_list_append_node(syscall_list_t* ptr, syscall_entry_t * entry)
+{
+ syscall_list_t* tmp;
+ tmp = (syscall_list_t *)kmalloc(sizeof(syscall_list_t), GFP_KERNEL);
+ memset(tmp, 0, sizeof(syscall_list_t));
+
+ tmp->entry = entry;
+ list_add_tail( &(tmp->list), &(ptr->list) );
+}
+
+void cap_list_append_node(cap_list_t* ptr, cap_entry_t * entry)
+{
+ cap_list_t* tmp;
+ tmp = (cap_list_t *)kmalloc(sizeof(cap_list_t), GFP_KERNEL);
+ memset(tmp, 0, sizeof(cap_list_t));
+
+ tmp->entry = entry;
+ list_add_tail( &(tmp->list), &(ptr->list) );
+}
+
diff -ruN linux-2.6.28.7/security/sos/parser.c linux-2.6.28-7-patched/security/sos/parser.c
--- linux-2.6.28.7/security/sos/parser.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.28-7-patched/security/sos/parser.c 2009-04-28 23:41:16.000000000 +0200
@@ -0,0 +1,504 @@
+/*
+ * SOS Security Module
+ * Martin Formanko 2009
+ *
+ * parser.c - Parsing routines, formatting to/from readable format
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/module.h>
+#include <linux/unistd.h>
+#include <linux/string.h>
+
+#include <linux/sos/sos.h>
+#include <linux/sos/parser.h>
+#include <linux/sos/entrylist.h>
+
+#define MAX_DELIMITERS_COUNT 10
+
+/* macro for jumping to another field excluding delimiters */
+#define ANOTHER_FIELD() \
+for (i = 0; i<MAX_DELIMITERS_COUNT && *next_char == DELIMITER; i++ && next_char++); \
+if (i == MAX_DELIMITERS_COUNT) return(-EBADFORMAT);
+
+/* convert from unescaped to escaped format*/
+int convert_fname_to_readable(char* source, char* dest)
+{
+ char* next_char = source;
+ char buffer[1024];
+ int i = 0;
+
+ memset(buffer, 0, 1024);
+
+ while (*next_char != '\0')
+ {
+ if (*next_char == '\t' || *next_char == '\n' || *next_char == '\\')
+ {
+ buffer[i] = '\\';
+ i++;
+
+ switch (*next_char)
+ {
+ case '\n': buffer[i] = 'n'; i++; break;
+ case '\t': buffer[i] = 't'; i++; break;
+ case '\\': buffer[i] = '\\'; i++; break;
+ }
+
+ next_char++;
+ }
+
+ buffer[i] = *next_char;
+ i++;
+
+ next_char++;
+ }
+
+ buffer[i] = 0;
+ strcpy(dest, buffer);
+
+ return 0;
+}
+
+/* convert filename with \t\n\\ characters to its unescaped format */
+int convert_fname_from_readable(char* source, char* dest)
+{
+ char* next_char = source;
+ char buffer[1024];
+ int i = 0;
+
+ while (*next_char != '\0')
+ {
+ if (*next_char == '\\')
+ {
+ next_char++;
+ switch (*next_char)
+ {
+ case 'n': buffer[i] = '\n'; break;
+ case 't': buffer[i] = '\t'; break;
+ case '\\': buffer[i] = '\\'; break;
+ default: buffer[i] = *next_char; break; /* \a? */
+ }
+ i++;
+ next_char++;
+ continue;
+ }
+ buffer[i] = *next_char;
+ i++;
+ next_char++;
+ }
+ buffer[i] = 0;
+ strcpy(dest, buffer);
+ return 0;
+}
+
+/* converts from array of integers to its string representation */
+void convert_caps_to_string(int caps[CAP_COUNT], char* dest)
+{
+ int i;
+
+ for (i = 0; i < CAP_COUNT; i++)
+ {
+ dest[i] = (caps[i] == 1 ? '1' : '0');
+ }
+ dest[i] = 0;
+}
+
+int parse_uid(UidStruct* uid, char** next_char)
+{
+ int i = 0;
+ char buffer[1024];
+
+ /* uid */
+ if (**next_char == '*')
+ {
+ uid->wildcard = 1;
+
+ (*next_char) += 2;
+ }
+ else
+ {
+ i = 0;
+ uid->range = 0;
+
+ while (**next_char != DELIMITER)
+ {
+ if (**next_char == '-')
+ {
+ uid->range = 1;
+
+ buffer[i] = 0;
+ uid->low_bound = simple_strtol(buffer, NULL, 0);
+ i = 0;
+ } else if (**next_char >= '0' && **next_char <= '9')
+ {
+ buffer[i] = **next_char;
+ i++;
+ } else return -EBADFORMAT;
+ (*next_char)++;
+ }
+
+ buffer[i] = 0;
+
+ if (!uid->range)
+ uid->value = simple_strtol(buffer, NULL, 0);
+ else
+ uid->high_bound = simple_strtol(buffer, NULL, 0);
+
+ (*next_char)++;
+ }
+ return 0;
+}
+
+int parse_filename(FileStruct* file, char ** next_char)
+{
+
+ int i;
+ char buffer[1024];
+
+ /* filename */
+ if (**next_char == '*')
+ {
+ file->wildcard = 1;
+ (*next_char) += 2;
+ }
+ else
+ {
+ file->wildcard = 0;
+ i = 0;
+ while (**next_char != DELIMITER)
+ {
+
+ buffer[i] = **next_char;
+ (*next_char)++;
+ i++;
+ }
+
+ buffer[i] = 0;
+
+ convert_fname_from_readable(buffer, buffer);
+
+ file->name = (char *)kmalloc(sizeof(char) * (strlen(buffer) + 1), GFP_KERNEL);
+ strcpy(file->name, buffer);
+
+ (*next_char)++;
+ }
+ return 0;
+}
+
+
+/* converts list entry to the formatted string */
+void syscall_format_line(syscall_entry_t * entry, char *dest)
+{
+ char uid[128], allow[128], fake[128], filename[1024];
+ int len = 0;
+
+ memset(filename, 0, 1024);
+
+ if (entry->uid.wildcard)
+ {
+ len += sprintf(uid, "*");
+ }
+ else
+ {
+ if (entry->uid.range)
+ len += sprintf(uid, "%d-%d", entry->uid.low_bound, entry->uid.high_bound);
+ else
+ len += sprintf(uid, "%d", entry->uid.value);
+ }
+
+
+ if (entry->file.wildcard == 1)
+ len += sprintf(filename, "*");
+ else
+ {
+ convert_fname_to_readable(entry->file.name, filename);
+ len += strlen(filename);
+ }
+
+ len += sprintf(allow, "%d", entry->allow);
+ len += sprintf(fake, "%d", entry->fake_return_value);
+
+// tmp = (char *)kmalloc(sizeof(char) * len + 6, GFP_KERNEL);
+
+ sprintf(dest, "%s%c%s%c%s%c%s", uid, DELIMITER, filename, DELIMITER, allow, DELIMITER, fake);
+
+}
+
+/* converts list entry to the formatted string */
+void cap_format_line(cap_entry_t * entry, char* dest)
+{
+ char uid[128], filename[1024];
+ int len = 0;
+
+ char orSet[CAP_COUNT+1];
+ char andSet[CAP_COUNT+1];
+
+ uid[0] = 0;
+ filename[0] = 0;
+
+ memset(orSet, 0, CAP_COUNT);
+ memset(andSet, 0, CAP_COUNT);
+
+ convert_caps_to_string(entry->orSet, orSet);
+ convert_caps_to_string(entry->andSet, andSet);
+
+ if (entry->uid.wildcard)
+ {
+ len += sprintf(uid, "*");
+ }
+ else
+ {
+ if (entry->uid.range)
+ len += sprintf(uid, "%d-%d", entry->uid.low_bound, entry->uid.high_bound);
+ else
+ len += sprintf(uid, "%d", entry->uid.value);
+ }
+
+
+ if (entry->file.wildcard == 1)
+ len += sprintf(filename, "*");
+ else
+ {
+ convert_fname_to_readable(entry->file.name, filename);
+ len += strlen(filename);
+ }
+
+// tmp = (char *)kmalloc(sizeof(char) * (len + (CAP_COUNT*2) + 5), GFP_KERNEL);
+
+ sprintf(dest, "%s%c%s%c%s%c%s", uid, DELIMITER, filename, DELIMITER, andSet, DELIMITER, orSet);
+
+}
+
+/* parses capbilitiers */
+int parse_cap_data(cap_list_t * list, char *data)
+{
+ char buffer[1024];
+ int i = 0;
+ cap_entry_t *entry;
+ char *next_char = (char *)data;
+
+ if (!strlen(data) || list == NULL || !data)
+ return 0;
+
+ memset(buffer, 0, 1024);
+
+#ifdef __DEBUG_2
+ _DEBUG_LOG_VER("PARSER.C: Parsing: %s\n", data);
+#endif
+
+ while (*next_char != 0)
+ {
+ buffer[i] = *next_char;
+ next_char++;
+ i++;
+
+ if ((*next_char-1 != '\\' && *next_char == '\n') || *next_char == '\0')
+ {
+ buffer[i] = 0;
+
+ entry = (cap_entry_t *)kmalloc(sizeof(cap_entry_t), GFP_KERNEL);
+
+ /* if there's problem return to the writing callback */
+ if (parse_cap_line(buffer, entry) < 0)
+ {
+ kfree(entry);
+ return -EBADFORMAT;
+ }
+
+ cap_list_append_node(list, entry);
+
+ i = 0;
+ next_char++;
+ }
+ }
+ return 0;
+}
+
+int parse_cap_line(char * line, cap_entry_t* entry)
+{
+ char* next_char = line;
+ int i = 0;
+ char buffer[1024];
+
+ if (!line || !strlen(line))
+ return 0;
+
+ memset(entry, 0, sizeof(cap_entry_t));
+
+ memset(buffer, 0, 256);
+
+ if (parse_uid(&entry->uid, &next_char))
+ return (-EBADFORMAT);
+
+ ANOTHER_FIELD();
+
+ if (parse_filename(&entry->file, &next_char))
+ return (-EBADFORMAT);
+
+ ANOTHER_FIELD();
+
+ /* and/or set consisting of 64 binary digits */
+ i = 0;
+ while (*next_char != DELIMITER && i <= CAP_COUNT)
+ {
+
+ if (*next_char == '1')
+ entry->andSet[i] = 1;
+ else if (*next_char == '0')
+ entry->andSet[i] = 0;
+ else
+ return -EBADFORMAT;
+
+ next_char++;
+ i++;
+
+ if (*next_char == '\0')
+ break;
+ }
+ buffer[i] = 0;
+
+ if (i != CAP_COUNT)
+ return -EBADFORMAT;
+
+ next_char++;
+
+ ANOTHER_FIELD();
+
+ i = 0;
+ while (*next_char != DELIMITER)
+ {
+ if (*next_char == '1')
+ entry->orSet[i] = 1;
+ else if (*next_char == '0')
+ entry->orSet[i] = 0;
+ else
+ return -EBADFORMAT;
+
+ next_char++;
+ i++;
+
+ if (*next_char == '\0' || *next_char == '\n')
+ break;
+ }
+ buffer[i] = 0;
+
+ if (i != CAP_COUNT)
+ return -EBADFORMAT;
+
+ return 1;
+
+}
+
+/* parses syscalls */
+int parse_syscall_data(syscall_list_t* list, char * data)
+{
+ char buffer[1024];
+ int i = 0;
+ syscall_entry_t *entry;
+ char *next_char = (char *)data;
+
+ if (!strlen(data) || list == NULL || !data)
+ {
+ return 0;
+ }
+
+ memset(buffer, 0, 1024);
+
+#ifdef __DEBUG_2
+ _DEBUG_LOG_VER("PARSER.C: Parsing: %s\n", data);
+#endif
+
+ while (*next_char != 0)
+ {
+ buffer[i] = *next_char;
+ next_char++;
+ i++;
+
+ /* end of line */
+ if ((*next_char == '\n' && *next_char-1 != '\\') || *next_char == '\0')
+ {
+ buffer[i] = 0;
+ if (strlen(buffer) > 1)
+ {
+ entry = (syscall_entry_t *)kmalloc(sizeof(syscall_entry_t), GFP_KERNEL);
+ memset(entry, 0, sizeof(syscall_entry_t));
+
+ if (parse_syscall_line(buffer, entry) < 0)
+ {
+ kfree(entry);
+ return -EBADFORMAT;
+ }
+
+ syscall_list_append_node(list, entry);
+ }
+
+ i = 0;
+ next_char++;
+ }
+ }
+ return 0;
+}
+
+
+int parse_syscall_line(char * line, syscall_entry_t * entry)
+{
+ char buffer[1024];
+ char *next_char;
+ int i = 0;
+
+ if (!line || !strlen(line))
+ return 0;
+
+ memset(entry, 0, sizeof(syscall_entry_t));
+ memset(buffer, 0, 256);
+
+ next_char = (char *)line;
+
+ if (parse_uid(&entry->uid, &next_char))
+ return (-EBADFORMAT);
+
+ ANOTHER_FIELD();
+
+ if (parse_filename(&entry->file, &next_char))
+ return (-EBADFORMAT);
+
+ ANOTHER_FIELD();
+
+ /* allow bit */
+ if (*next_char == '1')
+ entry->allow = 1;
+ else if (*next_char == '0')
+ entry->allow = 0;
+ else return -EBADFORMAT;
+
+ next_char++;
+
+ ANOTHER_FIELD();
+
+ /* fake retval */
+ if (*next_char != '-' && entry->allow == 0)
+ return -EBADFORMAT;
+
+ i = 0;
+ buffer[0] = 0;
+
+ while(*next_char != '\0')
+ {
+ if ((*next_char >= '0' && *next_char <= '9') || (i == 0 && *next_char == '-'))
+ buffer[i] = *next_char;
+ else
+ return -EBADFORMAT;
+ i++;
+ next_char++;
+ }
+ buffer[i] = 0;
+
+ entry->fake_return_value = simple_strtol(buffer, NULL, 0);
+
+ return 0;
+
+}
+
diff -ruN linux-2.6.28.7/security/sos/sos.c linux-2.6.28-7-patched/security/sos/sos.c
--- linux-2.6.28.7/security/sos/sos.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.28-7-patched/security/sos/sos.c 2009-04-29 00:08:09.000000000 +0200
@@ -0,0 +1,563 @@
+/*
+ * SOS Security Module
+ * Martin Formanko 2009
+ *
+ * sos.c - main routines, callbacks
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/module.h>
+#include <linux/unistd.h>
+#include <linux/vmalloc.h>
+#include <linux/spinlock.h>
+#include <asm/uaccess.h>
+
+#include <linux/list.h>
+
+#include <linux/sos/sos.h>
+#include <linux/sos/entrylist.h>
+#include <linux/sos/parser.h>
+
+#define SAFE_FREE(__list, __type) \
+list_for_each_safe(pos, q, &(__list->list)) \
+{ \
+ iter = list_entry(pos, __type, list); \
+ kfree(iter->entry->file.name); \
+ kfree(iter->entry); \
+ list_del(pos); \
+ kfree(iter); \
+}
+
+
+/* lists for syscalls */
+syscall_list_t * sys_list_fchmodat;
+syscall_list_t * sys_list_setresuid;
+syscall_list_t * sys_list_chown;
+syscall_list_t * sys_list_dup2;
+syscall_list_t * sys_list_chroot;
+syscall_list_t * sys_list_umount;
+syscall_list_t * sys_list_write;
+
+spinlock_t lock_sys = SPIN_LOCK_UNLOCKED;
+spinlock_t lock_cap = SPIN_LOCK_UNLOCKED;
+
+/* list for capabilities */
+cap_list_t * cap_list;
+
+int sos_is_initialized = 0;
+
+static char procfs_buffer[MAX_FILE_LENGTH];
+static unsigned long procfs_buffer_size = 0;
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SOS Syscalls/Capabilities Security Module");
+MODULE_AUTHOR("Martin Formanko");
+
+/* called from every syscall */
+int sos_is_syscall_allowed(int syscall_num, struct task_struct* task, int* fake_return_value, int kernel_allow)
+{
+ syscall_list_t* iter;
+ syscall_list_t* sys_list = get_list_by_syscall_num(syscall_num);
+ char filepath[1024];
+ int uid;
+ char syscall_name[32];
+ char strline[2048];
+
+ memset(strline, 0, 2048);
+
+ spin_lock_irq(&lock_sys);
+
+ /* Macro current is not fulfilled on boot yet, allow any calls */
+ if (prepare_task_info(task, &uid, filepath, sizeof(filepath)) == -ECURRENT_NULL)
+ {
+ spin_unlock_irq(&lock_sys);
+ return 1;
+ }
+
+ list_for_each_entry(iter, &(sys_list->list), list)
+ {
+ if ((iter->entry->uid.value == uid) || (iter->entry->uid.wildcard) || (iter->entry->uid.range && ((iter->entry->uid.low_bound <= uid) && (iter->entry->uid.high_bound >= uid))))
+ {
+ if (iter->entry->file.wildcard || (!strcmp(iter->entry->file.name, filepath)))
+ {
+ /* we matched the entry */
+#ifdef __DEBUG_1
+ convert_syscall_num_to_name(syscall_num, syscall_name);
+ if (iter->entry->allow != kernel_allow)
+ {
+ syscall_format_line(iter->entry, strline);
+ if (iter->entry->allow)
+ _DEBUG_LOG("SOS: syscall \"%s\" allowed for program \"%s\" and user %d (rule: %s)\n", syscall_name, filepath, uid, strline);
+ else
+ _DEBUG_LOG("SOS: syscall \"%s\" denied for program \"%s\" and user %d (rule: %s)\n", syscall_name, filepath, uid, strline);
+ }
+#endif
+
+ if (!iter->entry->allow)
+ {
+ *fake_return_value = iter->entry->fake_return_value;
+ spin_unlock_irq(&lock_sys);
+
+ return 0;
+ }
+ spin_unlock_irq(&lock_sys);
+
+ return 1;
+ }
+ }
+ }
+ spin_unlock_irq(&lock_sys);
+ return 1;
+}
+
+const char* get_capname_from_num(int cap_num)
+{
+ //dat do pola?
+ switch (cap_num)
+ {
+ case 0: return( "CAP_CHOWN"); break;
+ case 1: return( "CAP_DAC_OVERRIDE"); break;
+ case 2: return( "CAP_DAC_READ_SEARCH"); break;
+ case 3: return( "CAP_FOWNER"); break;
+ case 4: return( "CAP_FSETID"); break;