/* * patch-cmdline.c - patch the kernel command line on rb532 * * Copyright (C) 2006 Felix Fietkau * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * */ #include #include #include #include #include #include #include #include #define SEARCH_SPACE (16 * 1024) #define CMDLINE_MAX 512 int main(int argc, char **argv) { int fd, found = 0, len, ret = -1; char *ptr, *p; if (argc != 3) { fprintf(stderr, "Usage: %s \n", argv[0]); goto err1; } len = strlen(argv[2]); if (len + 9 > CMDLINE_MAX) { fprintf(stderr, "Command line string too long\n"); goto err1; } if (((fd = open(argv[1], O_RDWR)) < 0) || (ptr = (char *) mmap(0, SEARCH_SPACE + CMDLINE_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == (void *) (-1)) { fprintf(stderr, "Could not open kernel image"); goto err2; } for (p = ptr; p < (ptr + SEARCH_SPACE); p += 4) { if (memcmp(p, "CMDLINE:", 8) == 0) { found = 1; p += 8; break; } } if (!found) { fprintf(stderr, "Command line marker not found!\n"); goto err3; } memset(p, 0, CMDLINE_MAX - 8); strcpy(p, argv[2]); msync(p, CMDLINE_MAX, MS_SYNC|MS_INVALIDATE); ret = 0; err3: munmap((void *) ptr, len); err2: if (fd > 0) close(fd); err1: return ret; } s.h?id=c9bf3f8f19f1546262040219528f89a4da2bea34'>diffstats
path: root/xen/include/acm/acm_hooks.h
blob: a48755e9f18c81777950599f453206d080a72acb (plain) 
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/****************************************************************
 * acm_hooks.h 
 * 
 * Copyright (C) 2005 IBM Corporation
 *
 * Author:
 * Reiner Sailer <sailer@watson.ibm.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, version 2 of the
 * License.
 *
 * acm header file implementing the global (policy-independent)
 *      sHype hooks that are called throughout Xen.
 * 
 */

#ifndef _ACM_HOOKS_H
#define _ACM_HOOKS_H

#include <xen/config.h>
#include <xen/errno.h>
#include <xen/types.h>
#include <xen/lib.h>
#include <xen/delay.h>
#include <xen/sched.h>
#include <xen/multiboot.h>
#include <public/acm.h>
#include <acm/acm_core.h>
#include <public/dom0_ops.h>
#include <public/event_channel.h>
#include <asm/current.h>

/*
 * HOOK structure and meaning (justifies a few words about our model):
 * 
 * General idea: every policy-controlled system operation is reflected in a 
 *               transaction in the system's security state
 *
 *      Keeping the security state consistent requires "atomic" transactions.
 *      The name of the hooks to place around policy-controlled transactions
 *      reflects this. If authorizations do not involve security state changes,
 *      then and only then POST and FAIL hooks remain empty since we don't care
 *      about the eventual outcome of the operation from a security viewpoint.
 *
 *      PURPOSE of hook types:
 *      ======================
 *      PRE-Hooks
 *       a) general authorization to guard a controlled system operation
 *       b) prepare security state change
 *          (means: fail hook must be able to "undo" this)
 *
 *      POST-Hooks
 *       a) commit prepared state change
 *
 *      FAIL-Hooks
 *       a) roll-back prepared security state change from PRE-Hook
 *
 *
 *      PLACEMENT of hook types:
 *      ========================
 *      PRE-Hooks must be called before a guarded/controlled system operation
 *      is started. They return ACM_ACCESS_PERMITTED, ACM_ACCESS_DENIED or
 *      error. Operation must be aborted if return is not ACM_ACCESS_PERMITTED.
 *
 *      POST-Hooks must be called after a successful system operation.
 *      There is no return value: commit never fails.
 *
 *      FAIL-Hooks must be called:
 *       a) if system transaction (operation) fails after calling the PRE-hook
 *       b) if another (secondary) policy denies access in its PRE-Hook
 *          (policy layering is useful but requires additional handling)
 *
 * Hook model from a security transaction viewpoint:
 *   start-sys-ops--> prepare ----succeed-----> commit --> sys-ops success
 *                   (pre-hook)  \           (post-hook)
 *                                \
 *                               fail
 *                                   \
 *                                    \
 *                                  roll-back
 *                                 (fail-hook)
 *                                        \
 *                                       sys-ops error
 *
 */

struct acm_operations {
    /* policy management functions (must always be defined!) */
    int  (*init_domain_ssid)           (void **ssid, ssidref_t ssidref);
    void (*free_domain_ssid)           (void *ssid);
    int  (*dump_binary_policy)         (u8 *buffer, u32 buf_size);
    int  (*set_binary_policy)          (u8 *buffer, u32 buf_size);
    int  (*dump_statistics)            (u8 *buffer, u16 buf_size);
    int  (*dump_ssid_types)            (ssidref_t ssidref, u8 *buffer, u16 buf_size);
    /* domain management control hooks (can be NULL) */
    int  (*pre_domain_create)          (void *subject_ssid, ssidref_t ssidref);
    void (*post_domain_create)         (domid_t domid, ssidref_t ssidref);
    void (*fail_domain_create)         (void *subject_ssid, ssidref_t ssidref);
    void (*post_domain_destroy)        (void *object_ssid, domid_t id);
    /* event channel control hooks  (can be NULL) */
    int  (*pre_eventchannel_unbound)      (domid_t id1, domid_t id2);
    void (*fail_eventchannel_unbound)     (domid_t id1, domid_t id2);
    int  (*pre_eventchannel_interdomain)  (domid_t id);
    void (*fail_eventchannel_interdomain) (domid_t id);
    /* grant table control hooks (can be NULL)  */
    int  (*pre_grant_map_ref)          (domid_t id);
    void (*fail_grant_map_ref)         (domid_t id);
    int  (*pre_grant_setup)            (domid_t id);
    void (*fail_grant_setup)           (domid_t id);
    /* generic domain-requested decision hooks (can be NULL) */
    int (*sharing)                     (ssidref_t ssidref1, ssidref_t ssidref2);
};

/* global variables */
extern struct acm_operations *acm_primary_ops;
extern struct acm_operations *acm_secondary_ops;

/* if ACM_TRACE_MODE defined, all hooks should
 * print a short trace message */
/* #define ACM_TRACE_MODE */

#ifdef ACM_TRACE_MODE
# define traceprintk(fmt, args...) printk(fmt,## args)
#else
# define traceprintk(fmt, args...)
#endif

#ifndef ACM_SECURITY

static inline int acm_pre_dom0_op(struct dom0_op *op, void **ssid) 
{ return 0; }
static inline void acm_post_dom0_op(struct dom0_op *op, void *ssid) 
{ return; }
static inline void acm_fail_dom0_op(struct dom0_op *op, void *ssid) 
{ return; }
static inline int acm_pre_event_channel(struct evtchn_op *op) 
{ return 0; }
static inline int acm_pre_grant_map_ref(domid_t id) 
{ return 0; }
static inline int acm_pre_grant_setup(domid_t id) 
{ return 0; }
static inline int acm_init(unsigned int *initrdidx,
                           const multiboot_info_t *mbi,
                           unsigned long start)
{ return 0; }
static inline void acm_post_domain0_create(domid_t domid) 
{ return; }
static inline int acm_sharing(ssidref_t ssidref1, ssidref_t ssidref2)
{ return 0; }

#else

static inline int acm_pre_domain_create(void *subject_ssid, ssidref_t ssidref)
{
    if ((acm_primary_ops->pre_domain_create != NULL) && 
        acm_primary_ops->pre_domain_create(subject_ssid, ssidref))
        return ACM_ACCESS_DENIED;
    else if ((acm_secondary_ops->pre_domain_create != NULL) && 
             acm_secondary_ops->pre_domain_create(subject_ssid, ssidref)) {