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Generalize ipcperm() a little.

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This commit is contained in:
mycroft 1994-05-25 08:15:45 +00:00
parent 62843870cc
commit 30cbcb7e80
5 changed files with 33 additions and 46 deletions
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34
sys/kern/sysv_ipc.c
View File

@ -34,28 +34,28 @@
*/
int
ipcperm(uc, perm, mode)
struct ucred *uc;
ipcperm(cred, perm, mode)
struct ucred *cred;
struct ipc_perm *perm;
int mode;
{
int i = 0;
if (uc->cr_uid == 0)
return(0);
if (cred->cr_uid == 0)
return (0);
/*
* Does the user have permission?
*/
if (uc->cr_uid != perm->cuid && uc->cr_uid != perm->uid) {
i = 3;
/*
* Does the group have permission?
*/
if (!groupmember(perm->gid, uc) && !groupmember(perm->cgid, uc))
i += 3;
/* Check for user match. */
if (cred->cr_uid != perm->cuid && cred->cr_uid != perm->uid) {
if (mode & IPC_M)
return (EPERM);
/* Check for group match. */
mode >>= 3;
if (!groupmember(perm->gid, cred) &&
!groupmember(perm->cgid, cred))
/* Check for `other' match. */
mode >>= 3;
}
if (((mode&0700) & (perm->mode << i)) != mode)
return(EACCES);
if (mode & IPC_M)
return (0);
return ((mode & perm->mode) == mode ? 0 : EACCES);
}

16
sys/kern/sysv_msg.c
View File

@ -16,7 +16,7 @@
*
* This software is provided ``AS IS'' without any warranties of any kind.
*
* $Id: sysv_msg.c,v 1.6 1994/05/25 02:14:33 hpeyerl Exp $
* $Id: sysv_msg.c,v 1.7 1994/05/25 08:15:47 mycroft Exp $
*/
#include <sys/param.h>
@ -195,12 +195,8 @@ msgctl(p, uap, retval)
case IPC_RMID:
{
struct msg *msghdr;
if (cred->cr_uid != 0 &&
msqptr->msg_perm.cuid != cred->cr_uid &&
msqptr->msg_perm.uid != cred->cr_uid)
return(EPERM);
if ((eval = ipcperm(cred, &msgptr->msg_perm, IPC_M)))
return(eval);
/* Free the message headers */
msghdr = msqptr->msg_first;
while (msghdr != NULL) {
@ -227,10 +223,8 @@ msgctl(p, uap, retval)
break;
case IPC_SET:
if (cred->cr_uid != 0 &&
msqptr->msg_perm.cuid != cred->cr_uid &&
msqptr->msg_perm.uid != cred->cr_uid)
return(EPERM);
if ((eval = ipcperm(cred, &msgptr->msg_perm, IPC_M)))
return(eval);
if ((eval = copyin(user_msqptr, &msqbuf, sizeof(msqbuf))) != 0)
return(eval);
if (msqbuf.msg_qbytes > msqptr->msg_qbytes && cred->cr_uid != 0)

14
sys/kern/sysv_sem.c
View File

@ -5,7 +5,7 @@
*
* This software is provided ``AS IS'' without any warranties of any kind.
*
* $Id: sysv_sem.c,v 1.7 1994/05/25 02:14:29 hpeyerl Exp $
* $Id: sysv_sem.c,v 1.8 1994/05/25 08:15:49 mycroft Exp $
*/
#include <sys/param.h>
@ -324,10 +324,8 @@ semctl(p, uap, retval)
switch (cmd) {
case IPC_RMID:
if (cred->cr_uid != 0 &&
semaptr->sem_perm.cuid != cred->cr_uid &&
semaptr->sem_perm.uid != cred->cr_uid)
return(EPERM);
if ((eval = ipcperm(cred, &semaptr->sem_perm, IPC_M)))
return(eval);
semaptr->sem_perm.cuid = cred->cr_uid;
semaptr->sem_perm.uid = cred->cr_uid;
semtot -= semaptr->sem_nsems;
@ -344,10 +342,8 @@ semctl(p, uap, retval)
break;
case IPC_SET:
if (cred->cr_uid != 0 &&
semaptr->sem_perm.cuid != cred->cr_uid &&
semaptr->sem_perm.uid != cred->cr_uid)
return(EPERM);
if ((eval = ipcperm(cred, &semaptr->sem_perm, IPC_M)))
return(eval);
if ((eval = copyin(arg, &real_arg, sizeof(real_arg))) != 0)
return(eval);
if ((eval = copyin(real_arg.buf, (caddr_t)&sbuf,

12
sys/kern/sysv_shm.c
View File

@ -351,10 +351,8 @@ shmctl(p, uap, retval)
return error;
break;
case IPC_SET:
if (cred->cr_uid != 0 &&
shmseg->shm_perm.cuid != cred->cr_uid &&
shmseg->shm_perm.uid != cred->cr_uid)
return EPERM;
if (error = ipcperm(cred, &shmseg->shm_perm, IPC_M))
return error;
if (error = copyin(uap->ubuf, (caddr_t)&inbuf, sizeof(inbuf)))
return error;
shmseg->shm_perm.uid = inbuf.shm_perm.uid;
@ -365,10 +363,8 @@ shmctl(p, uap, retval)
shmseg->shm_ctime = time.tv_sec;
break;
case IPC_RMID:
if (cred->cr_uid != 0 &&
shmseg->shm_perm.cuid != cred->cr_uid &&
shmseg->shm_perm.uid != cred->cr_uid)
return EPERM;
if (error = ipcperm(cred, &shmseg->shm_perm, IPC_M))
return error;
shmseg->shm_perm.key = IPC_PRIVATE;
shmseg->shm_perm.mode |= SHMSEG_REMOVED;
if (shmseg->shm_nattch <= 0) {

3
sys/sys/ipc.h
View File

@ -41,7 +41,7 @@
* SUCH DAMAGE.
*
* from: @(#)ipc.h 8.3 (Berkeley) 1/21/94
* $Id: ipc.h,v 1.7 1994/05/21 04:13:59 cgd Exp $
* $Id: ipc.h,v 1.8 1994/05/25 08:16:02 mycroft Exp $
*/
/*
@ -65,6 +65,7 @@ struct ipc_perm {
/* common mode bits */
#define IPC_R 00400 /* read permission */
#define IPC_W 00200 /* write/alter permission */
#define IPC_M 10000 /* permission to change control info */
/* SVID required constants (same values as system 5) */
#define IPC_CREAT 01000 /* create entry if key does not exist */