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Subject[PATCH 2.6.24-rc8-mm1 11/15] (RFC) IPC: new IPC_SETALL command to modify all settings
From: Pierre Peiffer <pierre.peiffer@bull.net>

This patch adds a new IPC_SETALL command to the System V IPCs set of commands,
which allows to change all the settings of an IPC

It works exactly the same way as the IPC_SET command, except that it
additionally changes all the times and the pids values

Signed-off-by: Pierre Peiffer <pierre.peiffer@bull.net>
Acked-by: Serge Hallyn <serue@us.ibm.com>
---
include/linux/ipc.h | 1 +
ipc/compat.c | 3 +++
ipc/msg.c | 15 +++++++++++++--
ipc/sem.c | 10 +++++++++-
ipc/shm.c | 13 ++++++++++++-
ipc/util.c | 7 ++++++-
security/selinux/hooks.c | 3 +++
7 files changed, 47 insertions(+), 5 deletions(-)
Index: b/include/linux/ipc.h
===================================================================
--- a/include/linux/ipc.h
+++ b/include/linux/ipc.h
@@ -40,6 +40,7 @@ struct ipc_perm
#define IPC_STAT 2 /* get ipc_perm options */
#define IPC_INFO 3 /* see ipcs */
#define IPC_SETID 4 /* set ipc ID */
+#define IPC_SETALL 5 /* set all parameters */

/*
* Version flags for semctl, msgctl, and shmctl commands
Index: b/ipc/compat.c
===================================================================
--- a/ipc/compat.c
+++ b/ipc/compat.c
@@ -282,6 +282,7 @@ long compat_sys_semctl(int first, int se
err = -EFAULT;
break;

+ case IPC_SETALL:
case IPC_SET:
if (version == IPC_64) {
err = get_compat_semid64_ds(&s64, compat_ptr(pad));
@@ -431,6 +432,7 @@ long compat_sys_msgctl(int first, int se
err = sys_msgctl(first, second, uptr);
break;

+ case IPC_SETALL:
case IPC_SET:
if (version == IPC_64) {
err = get_compat_msqid64(&m64, uptr);
@@ -621,6 +623,7 @@ long compat_sys_shmctl(int first, int se
break;


+ case IPC_SETALL:
case IPC_SET:
if (version == IPC_64) {
err = get_compat_shmid64_ds(&s64, uptr);
Index: b/ipc/msg.c
===================================================================
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -426,7 +426,7 @@ static int msgctl_down(struct ipc_namesp
struct msg_queue *msq;
int err;

- if (cmd == IPC_SET) {
+ if (cmd == IPC_SET || cmd == IPC_SETALL) {
if (copy_msqid_from_user(&msqid64, buf, version))
return -EFAULT;
}
@@ -447,6 +447,7 @@ static int msgctl_down(struct ipc_namesp
freeque(ns, ipcp);
goto out_up;
case IPC_SET:
+ case IPC_SETALL:
if (msqid64.msg_qbytes > ns->msg_ctlmnb &&
!capable(CAP_SYS_RESOURCE)) {
err = -EPERM;
@@ -456,7 +457,14 @@ static int msgctl_down(struct ipc_namesp
msq->q_qbytes = msqid64.msg_qbytes;

ipc_update_perm(&msqid64.msg_perm, ipcp);
- msq->q_ctime = get_seconds();
+ if (cmd == IPC_SETALL) {
+ msq->q_stime = msqid64.msg_stime;
+ msq->q_rtime = msqid64.msg_rtime;
+ msq->q_ctime = msqid64.msg_ctime;
+ msq->q_lspid = msqid64.msg_lspid;
+ msq->q_lrpid = msqid64.msg_lrpid;
+ } else
+ msq->q_ctime = get_seconds();
/* sleeping receivers might be excluded by
* stricter permissions.
*/
@@ -507,6 +515,8 @@ asmlinkage long sys_msgctl(int msqid, in
return -EINVAL;

version = ipc_parse_version(&cmd);
+ if (version < 0)
+ return -EINVAL;
ns = current->nsproxy->ipc_ns;

switch (cmd) {
@@ -594,6 +604,7 @@ asmlinkage long sys_msgctl(int msqid, in
return success_return;
}
case IPC_SET:
+ case IPC_SETALL:
case IPC_RMID:
err = msgctl_down(ns, msqid, cmd, buf, version);
return err;
Index: b/ipc/sem.c
===================================================================
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -913,7 +913,7 @@ static int semctl_down(struct ipc_namesp
struct semid64_ds semid64;
struct kern_ipc_perm *ipcp;

- if(cmd == IPC_SET) {
+ if (cmd == IPC_SET || cmd == IPC_SETALL) {
if (copy_semid_from_user(&semid64, arg.buf, version))
return -EFAULT;
}
@@ -936,6 +936,11 @@ static int semctl_down(struct ipc_namesp
ipc_update_perm(&semid64.sem_perm, ipcp);
sma->sem_ctime = get_seconds();
break;
+ case IPC_SETALL:
+ ipc_update_perm(&semid64.sem_perm, ipcp);
+ sma->sem_ctime = semid64.sem_ctime;
+ sma->sem_otime = semid64.sem_otime;
+ break;
case IPC_SETID:
err = sem_chid_nolock(ns, sma, (int)arg.val);
break;
@@ -978,6 +983,8 @@ asmlinkage long sys_semctl (int semid, i
return -EINVAL;

version = ipc_parse_version(&cmd);
+ if (version < 0)
+ return -EINVAL;
ns = current->nsproxy->ipc_ns;

switch(cmd) {
@@ -998,6 +1005,7 @@ asmlinkage long sys_semctl (int semid, i
return err;
case IPC_RMID:
case IPC_SET:
+ case IPC_SETALL:
err = semctl_down(ns, semid, cmd, version, arg);
return err;
case IPC_SETID:
Index: b/ipc/shm.c
===================================================================
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -658,7 +658,7 @@ static int shmctl_down(struct ipc_namesp
struct shmid_kernel *shp;
int err;

- if (cmd == IPC_SET) {
+ if (cmd == IPC_SET || cmd == IPC_SETALL) {
if (copy_shmid_from_user(&shmid64, buf, version))
return -EFAULT;
}
@@ -680,6 +680,14 @@ static int shmctl_down(struct ipc_namesp
ipc_update_perm(&shmid64.shm_perm, ipcp);
shp->shm_ctim = get_seconds();
break;
+ case IPC_SETALL:
+ ipc_update_perm(&shmid64.shm_perm, ipcp);
+ shp->shm_atim = shmid64.shm_atime;
+ shp->shm_dtim = shmid64.shm_dtime;
+ shp->shm_ctim = shmid64.shm_ctime;
+ shp->shm_cprid = shmid64.shm_cpid;
+ shp->shm_lprid = shmid64.shm_lpid;
+ break;
case IPC_SETID:
err = shm_chid_nolock(ns, shp, (int)(long)buf);
break;
@@ -723,6 +731,8 @@ asmlinkage long sys_shmctl(int shmid, in
}

version = ipc_parse_version(&cmd);
+ if (version < 0)
+ return -EINVAL;
ns = current->nsproxy->ipc_ns;

switch (cmd) { /* replace with proc interface ? */
@@ -870,6 +880,7 @@ asmlinkage long sys_shmctl(int shmid, in
}
case IPC_RMID:
case IPC_SET:
+ case IPC_SETALL:
err = shmctl_down(ns, shmid, cmd, buf, version);
return err;
case IPC_SETID:
Index: b/ipc/util.c
===================================================================
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -855,7 +855,7 @@ struct kern_ipc_perm *ipcctl_pre_down(st
if (err)
goto out_unlock;

- if (cmd == IPC_SET) {
+ if (cmd == IPC_SET || cmd == IPC_SETALL) {
err = audit_ipc_set_perm(extrat_perm, perm->uid,
perm->gid, perm->mode);
if (err)
@@ -883,6 +883,8 @@ out_up:
* Return IPC_64 for new style IPC and IPC_OLD for old style IPC.
* The @cmd value is turned from an encoding command and version into
* just the command code.
+ * In case of incompatibility between the command and the style, an
+ * errcode is returned.
*/

int ipc_parse_version (int *cmd)
@@ -891,6 +893,9 @@ int ipc_parse_version (int *cmd)
*cmd ^= IPC_64;
return IPC_64;
} else {
+ /* don't support this command for old ipc */
+ if (*cmd == IPC_SETALL)
+ return -EINVAL;
return IPC_OLD;
}
}
Index: b/security/selinux/hooks.c
===================================================================
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -4651,6 +4651,7 @@ static int selinux_msg_queue_msgctl(stru
perms = MSGQ__GETATTR | MSGQ__ASSOCIATE;
break;
case IPC_SET:
+ case IPC_SETALL:
case IPC_SETID:
perms = MSGQ__SETATTR;
break;
@@ -4800,6 +4801,7 @@ static int selinux_shm_shmctl(struct shm
perms = SHM__GETATTR | SHM__ASSOCIATE;
break;
case IPC_SET:
+ case IPC_SETALL:
case IPC_SETID:
perms = SHM__SETATTR;
break;
@@ -4912,6 +4914,7 @@ static int selinux_sem_semctl(struct sem
perms = SEM__DESTROY;
break;
case IPC_SET:
+ case IPC_SETALL:
case IPC_SETID:
perms = SEM__SETATTR;
break;
--
Pierre Peiffer


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