diff options
Diffstat (limited to 'sys/kern/sysv_ipc.c')
| -rw-r--r-- | sys/kern/sysv_ipc.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/sys/kern/sysv_ipc.c b/sys/kern/sysv_ipc.c new file mode 100644 index 0000000..e402cb5 --- /dev/null +++ b/sys/kern/sysv_ipc.c @@ -0,0 +1,246 @@ +/* $NetBSD: sysv_ipc.c,v 1.7 1994/06/29 06:33:11 cgd Exp $ */ +/*- + * Copyright (c) 1994 Herb Peyerl <hpeyerl@novatel.ca> + * Copyright (c) 2006 nCircle Network Security, Inc. + * All rights reserved. + * + * This software was developed by Robert N. M. Watson for the TrustedBSD + * Project under contract to nCircle Network Security, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Herb Peyerl. + * 4. The name of Herb Peyerl may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "opt_compat.h" +#include "opt_sysvipc.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/sem.h> +#include <sys/shm.h> +#include <sys/ipc.h> +#include <sys/priv.h> +#include <sys/proc.h> +#include <sys/ucred.h> + +void (*shmfork_hook)(struct proc *, struct proc *) = NULL; +void (*shmexit_hook)(struct vmspace *) = NULL; + +/* called from kern_fork.c */ +void +shmfork(p1, p2) + struct proc *p1, *p2; +{ + + if (shmfork_hook != NULL) + shmfork_hook(p1, p2); + return; +} + +/* called from kern_exit.c */ +void +shmexit(struct vmspace *vm) +{ + + if (shmexit_hook != NULL) + shmexit_hook(vm); + return; +} + +/* + * Check for IPC permission. + * + * Note: The MAC Framework does not require any modifications to the + * ipcperm() function, as access control checks are performed throughout the + * implementation of each primitive. Those entry point calls complement the + * ipcperm() discertionary checks. Unlike file system discretionary access + * control, the original create of an object is given the same rights as the + * current owner. + */ +int +ipcperm(struct thread *td, struct ipc_perm *perm, int acc_mode) +{ + struct ucred *cred = td->td_ucred; + int error, obj_mode, dac_granted, priv_granted; + + dac_granted = 0; + if (cred->cr_uid == perm->cuid || cred->cr_uid == perm->uid) { + obj_mode = perm->mode; + dac_granted |= IPC_M; + } else if (groupmember(perm->gid, cred) || + groupmember(perm->cgid, cred)) { + obj_mode = perm->mode; + obj_mode <<= 3; + } else { + obj_mode = perm->mode; + obj_mode <<= 6; + } + + /* + * While the System V IPC permission model allows IPC_M to be + * granted, as part of the mode, our implementation requires + * privilege to adminster the object if not the owner or creator. + */ +#if 0 + if (obj_mode & IPC_M) + dac_granted |= IPC_M; +#endif + if (obj_mode & IPC_R) + dac_granted |= IPC_R; + if (obj_mode & IPC_W) + dac_granted |= IPC_W; + + /* + * Simple case: all required rights are granted by DAC. + */ + if ((dac_granted & acc_mode) == acc_mode) + return (0); + + /* + * Privilege is required to satisfy the request. + */ + priv_granted = 0; + if ((acc_mode & IPC_M) && !(dac_granted & IPC_M)) { + error = priv_check(td, PRIV_IPC_ADMIN); + if (error == 0) + priv_granted |= IPC_M; + } + + if ((acc_mode & IPC_R) && !(dac_granted & IPC_R)) { + error = priv_check(td, PRIV_IPC_READ); + if (error == 0) + priv_granted |= IPC_R; + } + + if ((acc_mode & IPC_W) && !(dac_granted & IPC_W)) { + error = priv_check(td, PRIV_IPC_WRITE); + if (error == 0) + priv_granted |= IPC_W; + } + + if (((dac_granted | priv_granted) & acc_mode) == acc_mode) + return (0); + else + return (EACCES); +} + +#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ + defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) +void +ipcperm_old2new(struct ipc_perm_old *old, struct ipc_perm *new) +{ + + new->cuid = old->cuid; + new->cgid = old->cgid; + new->uid = old->uid; + new->gid = old->gid; + new->mode = old->mode; + new->seq = old->seq; + new->key = old->key; +} + +void +ipcperm_new2old(struct ipc_perm *new, struct ipc_perm_old *old) +{ + + /* XXX: How to handle ID's > USHORT_MAX? */ + old->cuid = new->cuid; + old->cgid = new->cgid; + old->uid = new->uid; + old->gid = new->gid; + old->mode = new->mode; + old->seq = new->seq; + old->key = new->key; +} +#endif + +#ifdef COMPAT_FREEBSD32 +#include <sys/mount.h> +#include <sys/socket.h> +#include <compat/freebsd32/freebsd32.h> +#include <compat/freebsd32/freebsd32_ipc.h> +#include <compat/freebsd32/freebsd32_proto.h> +#include <compat/freebsd32/freebsd32_signal.h> +#include <compat/freebsd32/freebsd32_syscall.h> +#include <compat/freebsd32/freebsd32_util.h> + +#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \ + defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7) +void +freebsd32_ipcperm_old_in(struct ipc_perm32_old *ip32, struct ipc_perm *ip) +{ + + CP(*ip32, *ip, cuid); + CP(*ip32, *ip, cgid); + CP(*ip32, *ip, uid); + CP(*ip32, *ip, gid); + CP(*ip32, *ip, mode); + CP(*ip32, *ip, seq); + CP(*ip32, *ip, key); +} + +void +freebsd32_ipcperm_old_out(struct ipc_perm *ip, struct ipc_perm32_old *ip32) +{ + + CP(*ip, *ip32, cuid); + CP(*ip, *ip32, cgid); + CP(*ip, *ip32, uid); + CP(*ip, *ip32, gid); + CP(*ip, *ip32, mode); + CP(*ip, *ip32, seq); + CP(*ip, *ip32, key); +} +#endif + +void +freebsd32_ipcperm_in(struct ipc_perm32 *ip32, struct ipc_perm *ip) +{ + + CP(*ip32, *ip, cuid); + CP(*ip32, *ip, cgid); + CP(*ip32, *ip, uid); + CP(*ip32, *ip, gid); + CP(*ip32, *ip, mode); + CP(*ip32, *ip, seq); + CP(*ip32, *ip, key); +} + +void +freebsd32_ipcperm_out(struct ipc_perm *ip, struct ipc_perm32 *ip32) +{ + + CP(*ip, *ip32, cuid); + CP(*ip, *ip32, cgid); + CP(*ip, *ip32, uid); + CP(*ip, *ip32, gid); + CP(*ip, *ip32, mode); + CP(*ip, *ip32, seq); + CP(*ip, *ip32, key); +} +#endif |
