[PATCH 2.6.24-rc8-mm1 11/15] (RFC) IPC: new IPC_SETALL command to modify all settings

[pierre.peiffer-6ktuUTfB/bM@public.gmane.org]

[-- Attachment #1: ipc_setall.patch --]
[-- Type: text/plain, Size: 7733 bytes --]

From: Pierre Peiffer <pierre.peiffer-6ktuUTfB/bM@public.gmane.org>

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-6ktuUTfB/bM@public.gmane.org>
Acked-by: Serge Hallyn <serue-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
---

 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