The binary interface to the namespace sysctls was never implemented
resulting in some really weird things if you attempted to use
sys_sysctl to read your hostname for example.

This patch series simples the code a little and implements the binary
sysctl interface.

In testing this patch series I discovered that our 32bit compatibility
for the binary  sysctl interface is imperfect.  In particular
KERN_SHMMAX and KERN_SMMALL are size_t sized quantities and are
returned as 8 bytes on to 32bit binaries using a x86_64 kernel.  
However this has existing for a long time so it is not a new
regression with the namespace work.

Gads the whole sysctl thing needs work before it stops being easy
to shoot yourself in the foot.

Looking forward a little bit we need a better way to handle sysctls
and namespaces as our current technique will not work for the network
namespace.  I think something based on the current overlapping sysctl
trees will work but the proc side needs to be redone before we can
use it.

Eric



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This patch introduces get_uts and put_uts (used later)
and removes most of the special cases for when UTS namespace is compiled in.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
 kernel/sysctl.c |  128 +++++++++++--------------------------------------------
 1 files changed, 26 insertions(+), 102 deletions(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 09e569f..0521884 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -162,6 +162,28 @@ #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 int sysctl_legacy_va_layout;
 #endif
 
+static void *get_uts(ctl_table *table, int write)
+{
+	char *which = table->data;
+#ifdef CONFIG_UTS_NS
+	struct uts_namespace *uts_ns = current->nsproxy->uts_ns;
+	which = (which - (char *)&init_uts_ns) + (char *)uts_ns;
+#endif
+	if (!write)
+		down_read(&uts_sem);
+	else
+		down_write(&uts_sem);
+	return which;
+}
+
+static void put_uts(ctl_table *table, int write, void *which)
+{
+	if (!write)
+		up_read(&uts_sem);
+	else
+		up_write(&uts_sem);
+}
+
 /* /proc declarations: */
 
 #ifdef CONFIG_PROC_SYSCTL
@@ -228,7 +250,6 @@ #endif
 };
 
 static ctl_table kern_table[] = {
-#ifndef CONFIG_UTS_NS
 	{
 		.ctl_name	= KERN_OSTYPE,
 		.procname	= "ostype",
@@ -274,54 +295,6 @@ #ifndef CONFIG_UTS_NS
 		.proc_handler	= &proc_do_uts_string,
 		.strategy	= &sysctl_string,
 	},
-#else  /* !CONFIG_UTS_NS */
-	{
-		.ctl_name	= KERN_OSTYPE,
-		.procname	= "ostype",
-		.data		= NULL,
-		/* could maybe use __NEW_UTS_LEN here? */
-		.maxlen		= FIELD_SIZEOF(struct new_utsname, sysname),
-		.mode		= 0444,
-		.proc_handler	= &proc_do_uts_string,
-		.strategy	= &sysctl_string,
-	},
-	{
-		.ctl_name	= KERN_OSRELEASE,
-		.procname	= "osrelease",
-		.data		= NULL,
-		.maxlen		= FIELD_SIZEOF(struct new_utsname, release),
-		.mode		= 0444,
-		.proc_handler	= &proc_do_uts_string,
-		.strategy	= &sysctl_string,
-	},
-	{
-		.ctl_name	= KERN_VERSION,
-		.procname	= "version",
-		.data		= NULL,
-		.maxlen		= FIELD_SIZEOF(struct new_utsname, version),
-		.mode		= 0444,
-		.proc_handler	= &proc_do_uts_string,
-		.strategy	= &sysctl_string,
-	},
-	{
-		.ctl_name	= KERN_NODENAME,
-		.procname	= "hostname",
-		.data		= NULL,
-		.maxlen		= FIELD_SIZEOF(struct new_utsname, nodename),
-		.mode		= 0644,
-		.proc_handler	= &proc_do_uts_string,
-		.strategy	= &sysctl_string,
-	},
-	{
-		.ctl_name	= KERN_DOMAINNAME,
-		.procname	= "domainname",
-		.data		= NULL,
-		.maxlen		= FIELD_SIZEOF(struct new_utsname, domainname),
-		.mode		= 0644,
-		.proc_handler	= &proc_do_uts_string,
-		.strategy	= &sysctl_string,
-	},
-#endif /* !CONFIG_UTS_NS */
 	{
 		.ctl_name	= KERN_PANIC,
 		.procname	= "panic",
@@ -1755,66 +1728,17 @@ int proc_dostring(ctl_table *table, int 
  *	Special case of dostring for the UTS structure. This has locks
  *	to observe. Should this be in kernel/sys.c ????
  */
- 
-#ifndef CONFIG_UTS_NS
-static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
-		  void __user *buffer, size_t *lenp, loff_t *ppos)
-{
-	int r;
 
-	if (!write) {
-		down_read(&uts_sem);
-		r=proc_dostring(table,0,filp,buffer,lenp, ppos);
-		up_read(&uts_sem);
-	} else {
-		down_write(&uts_sem);
-		r=proc_dostring(table,1,filp,buffer,lenp, ppos);
-		up_write(&uts_sem);
-	}
-	return r;
-}
-#else /* !CONFIG_UTS_NS */
 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
 		  void __user *buffer, size_t *lenp, loff_t *ppos)
 {
 	int r;
-	struct uts_namespace* uts_ns = current->nsproxy->uts_ns;
-	char* which;
-
-	switch (table->ctl_name) {
-	case KERN_OSTYPE:
-		which = uts_ns->name.sysname;
-		break;
-	case KERN_NODENAME:
-		which = uts_ns->name.nodename;
-		break;
-	case KERN_OSRELEASE:
-		which = uts_ns->name.release;
-		break;
-	case KERN_VERSION:
-		which = uts_ns->name.version;
-		break;
-	case KERN_DOMAINNAME:
-		which = uts_ns->name.domainname;
-		break;
-	default:
-		r = -EINVAL;
-		goto out;
-	}
-
-	if (!write) {
-		down_read(&uts_sem);
-		r=_proc_do_string(which,table->maxlen,0,filp,buffer,lenp, ppos);
-		up_read(&uts_sem);
-	} else {
-		down_write(&uts_sem);
-		r=_proc_do_string(which,table->maxlen,1,filp,buffer,lenp, ppos);
-		up_write(&uts_sem);
-	}
- out:
+	void *which;
+	which = get_uts(table, write);
+	r = _proc_do_string(which, table->maxlen,write,filp,buffer,lenp, ppos);
+	put_uts(table, write, which);
 	return r;
 }
-#endif /* !CONFIG_UTS_NS */
 
 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
 				 int *valp,
-- 
1.4.2.rc3.g7e18e-dirty

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The problem:  When using sys_sysctl we don't read the proper values
for the variables exported from the uts namespace, nor do we do the
proper locking.

This patch introduces sysctl_uts_string which properly fetches the values
and does the proper locking.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
 kernel/sysctl.c |   37 ++++++++++++++++++++++++++++++++-----
 1 files changed, 32 insertions(+), 5 deletions(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 0521884..63db5a5 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -136,6 +136,10 @@ #endif
 static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
 		  void __user *buffer, size_t *lenp, loff_t *ppos);
 
+static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
+		  void __user *oldval, size_t __user *oldlenp,
+		  void __user *newval, size_t newlen, void **context);
+
 #ifdef CONFIG_PROC_SYSCTL
 static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
 		  void __user *buffer, size_t *lenp, loff_t *ppos);
@@ -257,7 +261,7 @@ static ctl_table kern_table[] = {
 		.maxlen		= sizeof(init_uts_ns.name.sysname),
 		.mode		= 0444,
 		.proc_handler	= &proc_do_uts_string,
-		.strategy	= &sysctl_string,
+		.strategy	= &sysctl_uts_string,
 	},
 	{
 		.ctl_name	= KERN_OSRELEASE,
@@ -266,7 +270,7 @@ static ctl_table kern_table[] = {
 		.maxlen		= sizeof(init_uts_ns.name.release),
 		.mode		= 0444,
 		.proc_handler	= &proc_do_uts_string,
-		.strategy	= &sysctl_string,
+		.strategy	= &sysctl_uts_string,
 	},
 	{
 		.ctl_name	= KERN_VERSION,
@@ -275,7 +279,7 @@ static ctl_table kern_table[] = {
 		.maxlen		= sizeof(init_uts_ns.name.version),
 		.mode		= 0444,
 		.proc_handler	= &proc_do_uts_string,
-		.strategy	= &sysctl_string,
+		.strategy	= &sysctl_uts_string,
 	},
 	{
 		.ctl_name	= KERN_NODENAME,
@@ -284,7 +288,7 @@ static ctl_table kern_table[] = {
 		.maxlen		= sizeof(init_uts_ns.name.nodename),
 		.mode		= 0644,
 		.proc_handler	= &proc_do_uts_string,
-		.strategy	= &sysctl_string,
+		.strategy	= &sysctl_uts_string,
 	},
 	{
 		.ctl_name	= KERN_DOMAINNAME,
@@ -293,7 +297,7 @@ static ctl_table kern_table[] = {
 		.maxlen		= sizeof(init_uts_ns.name.domainname),
 		.mode		= 0644,
 		.proc_handler	= &proc_do_uts_string,
-		.strategy	= &sysctl_string,
+		.strategy	= &sysctl_uts_string,
 	},
 	{
 		.ctl_name	= KERN_PANIC,
@@ -2600,6 +2604,23 @@ int sysctl_ms_jiffies(ctl_table *table, 
 	return 1;
 }
 
+
+/* The generic string strategy routine: */
+static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
+		  void __user *oldval, size_t __user *oldlenp,
+		  void __user *newval, size_t newlen, void **context)
+{
+	struct ctl_table uts_table;
+	int r, write;
+	write = newval && newlen;
+	memcpy(&uts_table, table, sizeof(uts_table));
+	uts_table.data = get_uts(table, write);
+	r = sysctl_string(&uts_table, name, nlen,
+		oldval, oldlenp, newval, newlen, context);
+	put_uts(table, write, uts_table.data);
+	return r;
+}
+
 #else /* CONFIG_SYSCTL_SYSCALL */
 
 
@@ -2664,6 +2685,12 @@ int sysctl_ms_jiffies(ctl_table *table, 
 	return -ENOSYS;
 }
 
+static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
+		  void __user *oldval, size_t __user *oldlenp,
+		  void __user *newval, size_t newlen, void **context)
+{
+	return -ENOSYS;
+}
 #endif /* CONFIG_SYSCTL_SYSCALL */
 
 /*
-- 
1.4.2.rc3.g7e18e-dirty

_______________________________________________
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This patch refactors the ipc sysctl support so that it is
simpler, more readable, and prepares for fixing the bug
with the wrong values being returned in the sys_sysctl interface.

The function proc_do_ipc_string was misnamed as it never handled
strings.  It's magic of when to work with strings and when to work
with longs belonged in the sysctl table.  I couldn't tell if the
code would work if you disabled the ipc namespace but it certainly
looked like it would have problems.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
 kernel/sysctl.c |  106 +++++++++++++++++++++++++------------------------------
 1 files changed, 49 insertions(+), 57 deletions(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 63db5a5..638aa14 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -91,7 +91,9 @@ #ifdef CONFIG_CHR_DEV_SG
 extern int sg_big_buff;
 #endif
 #ifdef CONFIG_SYSVIPC
-static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
+static int proc_ipc_dointvec(ctl_table *table, int write, struct file *filp,
+		void __user *buffer, size_t *lenp, loff_t *ppos);
+static int proc_ipc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
 		void __user *buffer, size_t *lenp, loff_t *ppos);
 #endif
 
@@ -188,6 +190,18 @@ static void put_uts(ctl_table *table, in
 		up_write(&uts_sem);
 }
 
+#ifdef CONFIG_SYSVIPC
+static void *get_ipc(ctl_table *table, int write)
+{
+	char *which = table->data;
+	struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
+	which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns;
+	return which;
+}
+#else
+#define get_ipc(T,W) ((T)->data)
+#endif
+
 /* /proc declarations: */
 
 #ifdef CONFIG_PROC_SYSCTL
@@ -457,58 +471,58 @@ #ifdef CONFIG_SYSVIPC
 	{
 		.ctl_name	= KERN_SHMMAX,
 		.procname	= "shmmax",
-		.data		= NULL,
-		.maxlen		= sizeof (size_t),
+		.data		= &init_ipc_ns.shm_ctlmax,
+		.maxlen		= sizeof (init_ipc_ns.shm_ctlmax),
 		.mode		= 0644,
-		.proc_handler	= &proc_do_ipc_string,
+		.proc_handler	= &proc_ipc_doulongvec_minmax,
 	},
 	{
 		.ctl_name	= KERN_SHMALL,
 		.procname	= "shmall",
-		.data		= NULL,
-		.maxlen		= sizeof (size_t),
+		.data		= &init_ipc_ns.shm_ctlall,
+		.maxlen		= sizeof (init_ipc_ns.shm_ctlall),
 		.mode		= 0644,
-		.proc_handler	= &proc_do_ipc_string,
+		.proc_handler	= &proc_ipc_doulongvec_minmax,
 	},
 	{
 		.ctl_name	= KERN_SHMMNI,
 		.procname	= "shmmni",
-		.data		= NULL,
-		.maxlen		= sizeof (int),
+		.data		= &init_ipc_ns.shm_ctlmni,
+		.maxlen		= sizeof (init_ipc_ns.shm_ctlmni),
 		.mode		= 0644,
-		.proc_handler	= &proc_do_ipc_string,
+		.proc_handler	= &proc_ipc_dointvec,
 	},
 	{
 		.ctl_name	= KERN_MSGMAX,
 		.procname	= "msgmax",
-		.data		= NULL,
-		.maxlen		= sizeof (int),
+		.data		= &init_ipc_ns.msg_ctlmax,
+		.maxlen		= sizeof (init_ipc_ns.msg_ctlmax),
 		.mode		= 0644,
-		.proc_handler	= &proc_do_ipc_string,
+		.proc_handler	= &proc_ipc_dointvec,
 	},
 	{
 		.ctl_name	= KERN_MSGMNI,
 		.procname	= "msgmni",
-		.data		= NULL,
-		.maxlen		= sizeof (int),
+		.data		= &init_ipc_ns.msg_ctlmni,
+		.maxlen		= sizeof (init_ipc_ns.msg_ctlmni),
 		.mode		= 0644,
-		.proc_handler	= &proc_do_ipc_string,
+		.proc_handler	= &proc_ipc_dointvec,
 	},
 	{
 		.ctl_name	= KERN_MSGMNB,
 		.procname	=  "msgmnb",
-		.data		= NULL,
-		.maxlen		= sizeof (int),
+		.data		= &init_ipc_ns.msg_ctlmnb,
+		.maxlen		= sizeof (init_ipc_ns.msg_ctlmnb),
 		.mode		= 0644,
-		.proc_handler	= &proc_do_ipc_string,
+		.proc_handler	= &proc_ipc_dointvec,
 	},
 	{
 		.ctl_name	= KERN_SEM,
 		.procname	= "sem",
-		.data		= NULL,
+		.data		= &init_ipc_ns.sem_ctls,
 		.maxlen		= 4*sizeof (int),
 		.mode		= 0644,
-		.proc_handler	= &proc_do_ipc_string,
+		.proc_handler	= &proc_ipc_dointvec,
 	},
 #endif
 #ifdef CONFIG_MAGIC_SYSRQ
@@ -2321,46 +2335,24 @@ int proc_dointvec_ms_jiffies(ctl_table *
 }
 
 #ifdef CONFIG_SYSVIPC
-static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
-		void __user *buffer, size_t *lenp, loff_t *ppos)
+static int proc_ipc_dointvec(ctl_table *table, int write, struct file *filp,
+	void __user *buffer, size_t *lenp, loff_t *ppos)
 {
-	void *data;
-	struct ipc_namespace *ns;
-
-	ns = current->nsproxy->ipc_ns;
-
-	switch (table->ctl_name) {
-	case KERN_SHMMAX:
-		data = &ns->shm_ctlmax;
-		goto proc_minmax;
-	case KERN_SHMALL:
-		data = &ns->shm_ctlall;
-		goto proc_minmax;
-	case KERN_SHMMNI:
-		data = &ns->shm_ctlmni;
-		break;
-	case KERN_MSGMAX:
-		data = &ns->msg_ctlmax;
-		break;
-	case KERN_MSGMNI:
-		data = &ns->msg_ctlmni;
-		break;
-	case KERN_MSGMNB:
-		data = &ns->msg_ctlmnb;
-		break;
-	case KERN_SEM:
-		data = &ns->sem_ctls;
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	return __do_proc_dointvec(data, table, write, filp, buffer,
+	void *which;
+	which = get_ipc(table, write);
+	return __do_proc_dointvec(which, table, write, filp, buffer,
 			lenp, ppos, NULL, NULL);
-proc_minmax:
-	return __do_proc_doulongvec_minmax(data, table, write, filp, buffer,
+}
+
+static int proc_ipc_doulongvec_minmax(ctl_table *table, int write,
+	struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+	void *which;
+	which = get_ipc(table, write);
+	return __do_proc_doulongvec_minmax(which, table, write, filp, buffer,
 			lenp, ppos, 1l, 1l);
 }
+
 #endif
 
 static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
-- 
1.4.2.rc3.g7e18e-dirty

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Currently there is a regression and the ipc sysctls
don't show up in the binary sysctl namespace.

This patch adds sysctl_ipc_data to read data/write from the
appropriate namespace and deliver it in the expected manner.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
 kernel/sysctl.c |   50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 50 insertions(+), 0 deletions(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 638aa14..24c2ca8 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -142,6 +142,10 @@ static int sysctl_uts_string(ctl_table *
 		  void __user *oldval, size_t __user *oldlenp,
 		  void __user *newval, size_t newlen, void **context);
 
+static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen,
+		  void __user *oldval, size_t __user *oldlenp,
+		  void __user *newval, size_t newlen, void **context);
+
 #ifdef CONFIG_PROC_SYSCTL
 static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
 		  void __user *buffer, size_t *lenp, loff_t *ppos);
@@ -475,6 +479,7 @@ #ifdef CONFIG_SYSVIPC
 		.maxlen		= sizeof (init_ipc_ns.shm_ctlmax),
 		.mode		= 0644,
 		.proc_handler	= &proc_ipc_doulongvec_minmax,
+		.strategy	= sysctl_ipc_data,
 	},
 	{
 		.ctl_name	= KERN_SHMALL,
@@ -483,6 +488,7 @@ #ifdef CONFIG_SYSVIPC
 		.maxlen		= sizeof (init_ipc_ns.shm_ctlall),
 		.mode		= 0644,
 		.proc_handler	= &proc_ipc_doulongvec_minmax,
+		.strategy	= sysctl_ipc_data,
 	},
 	{
 		.ctl_name	= KERN_SHMMNI,
@@ -491,6 +497,7 @@ #ifdef CONFIG_SYSVIPC
 		.maxlen		= sizeof (init_ipc_ns.shm_ctlmni),
 		.mode		= 0644,
 		.proc_handler	= &proc_ipc_dointvec,
+		.strategy	= sysctl_ipc_data,
 	},
 	{
 		.ctl_name	= KERN_MSGMAX,
@@ -499,6 +506,7 @@ #ifdef CONFIG_SYSVIPC
 		.maxlen		= sizeof (init_ipc_ns.msg_ctlmax),
 		.mode		= 0644,
 		.proc_handler	= &proc_ipc_dointvec,
+		.strategy	= sysctl_ipc_data,
 	},
 	{
 		.ctl_name	= KERN_MSGMNI,
@@ -507,6 +515,7 @@ #ifdef CONFIG_SYSVIPC
 		.maxlen		= sizeof (init_ipc_ns.msg_ctlmni),
 		.mode		= 0644,
 		.proc_handler	= &proc_ipc_dointvec,
+		.strategy	= sysctl_ipc_data,
 	},
 	{
 		.ctl_name	= KERN_MSGMNB,
@@ -515,6 +524,7 @@ #ifdef CONFIG_SYSVIPC
 		.maxlen		= sizeof (init_ipc_ns.msg_ctlmnb),
 		.mode		= 0644,
 		.proc_handler	= &proc_ipc_dointvec,
+		.strategy	= sysctl_ipc_data,
 	},
 	{
 		.ctl_name	= KERN_SEM,
@@ -523,6 +533,7 @@ #ifdef CONFIG_SYSVIPC
 		.maxlen		= 4*sizeof (int),
 		.mode		= 0644,
 		.proc_handler	= &proc_ipc_dointvec,
+		.strategy	= sysctl_ipc_data,
 	},
 #endif
 #ifdef CONFIG_MAGIC_SYSRQ
@@ -2613,6 +2624,45 @@ static int sysctl_uts_string(ctl_table *
 	return r;
 }
 
+/* The generic sysctl ipc data routine. */
+static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen,
+		void __user *oldval, size_t __user *oldlenp,
+		void __user *newval, size_t newlen, void **context)
+{
+	size_t len;
+	void *data;
+
+	/* Get out of I don't have a variable */
+	if (!table->data || !table->maxlen)
+		return -ENOTDIR;
+
+	data = get_ipc(table, 1);
+	if (!data)
+		return -ENOTDIR;
+
+	if (oldval && oldlenp) {
+		if (get_user(len, oldlenp))
+			return -EFAULT;
+		if (len) {
+			if (len > table->maxlen)
+				len = table->maxlen;
+			if (copy_to_user(oldval, data, len))
+				return -EFAULT;
+			if (put_user(len, oldlenp))
+				return -EFAULT;
+		}
+	}
+
+	if (newval && newlen) {
+		if (newlen > table->maxlen)
+			newlen = table->maxlen;
+
+		if (copy_from_user(data, newval, newlen))
+			return -EFAULT;
+	}
+	return 1;
+}
+
 #else /* CONFIG_SYSCTL_SYSCALL */
 
 
-- 
1.4.2.rc3.g7e18e-dirty

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Herbert Poetzl <herbert@13thfloor.at> writes:

> the linux banner needs some attention too, when I get
> around, I'll send a patch for that ...

In what sense?

I have trouble seeing the banner printed at bootup as being problematic.

Eric
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On Sun, Nov 26, 2006 at 09:59:26PM -0700, Eric W. Biederman wrote:
> 
> The binary interface to the namespace sysctls was never implemented
> resulting in some really weird things if you attempted to use
> sys_sysctl to read your hostname for example.
> 
> This patch series simples the code a little and implements the binary
> sysctl interface.
> 
> In testing this patch series I discovered that our 32bit compatibility
> for the binary  sysctl interface is imperfect.  In particular
> KERN_SHMMAX and KERN_SMMALL are size_t sized quantities and are
> returned as 8 bytes on to 32bit binaries using a x86_64 kernel.  
> However this has existing for a long time so it is not a new
> regression with the namespace work.
> 
> Gads the whole sysctl thing needs work before it stops being easy
> to shoot yourself in the foot.
> 
> Looking forward a little bit we need a better way to handle sysctls
> and namespaces as our current technique will not work for the network
> namespace.  I think something based on the current overlapping sysctl
> trees will work but the proc side needs to be redone before we can
> use it.

the linux banner needs some attention too, when I get
around, I'll send a patch for that ...

best,
Herbert

> Eric
> 
> 
> 
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Herbert Poetzl <herbert@13thfloor.at> writes:

> On Mon, Nov 27, 2006 at 03:40:35PM -0700, Eric W. Biederman wrote:
>> Herbert Poetzl <herbert@13thfloor.at> writes:
>> 
>> > the linux banner needs some attention too, when I get
>> > around, I'll send a patch for that ...
>> 
>> In what sense?
>> 
>> I have trouble seeing the banner printed at bootup as being problematic.
>
> was it removed from procfs after 2.6.19-rc6
> (/proc/version  sorry, haven't checked yet)

I see where you are coming from.  Yes that is a potential issue,
because ultimately that information is utsname information.  Given
that we don't allow any of that information to be changed currently
that isn't a 2.6.19 issue. 

Given that it is a don't care as long as we generate the same string
I don't see a problem with a patch to modify it, to track changes in
the current uts namespace.

Eric
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On Mon, Nov 27, 2006 at 03:40:35PM -0700, Eric W. Biederman wrote:
> Herbert Poetzl <herbert@13thfloor.at> writes:
> 
> > the linux banner needs some attention too, when I get
> > around, I'll send a patch for that ...
> 
> In what sense?
> 
> I have trouble seeing the banner printed at bootup as being problematic.

was it removed from procfs after 2.6.19-rc6
(/proc/version  sorry, haven't checked yet)

best,
Herbert

> Eric
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On Tue, Nov 28, 2006 at 08:38:25AM -0700, Eric W. Biederman wrote:
> Herbert Poetzl <herbert@13thfloor.at> writes:
> 
> > On Mon, Nov 27, 2006 at 03:40:35PM -0700, Eric W. Biederman wrote:
> >> Herbert Poetzl <herbert@13thfloor.at> writes:
> >> 
> >> > the linux banner needs some attention too, when I get
> >> > around, I'll send a patch for that ...
> >> 
> >> In what sense?
> >> 
> >> I have trouble seeing the banner printed at bootup as being problematic.
> >
> > was it removed from procfs after 2.6.19-rc6
> > (/proc/version  sorry, haven't checked yet)
> 
> I see where you are coming from. Yes that is a potential issue,
> because ultimately that information is utsname information. 
> Given that we don't allow any of that information to be changed
> currently that isn't a 2.6.19 issue.
> 
> Given that it is a don't care as long as we generate the same string
> I don't see a problem with a patch to modify it, to track changes in
> the current uts namespace.

thank you very much,
Herbert

> Eric
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Quoting Eric W. Biederman (ebiederm@xmission.com):
> This patch refactors the ipc sysctl support so that it is
> simpler, more readable, and prepares for fixing the bug
> with the wrong values being returned in the sys_sysctl interface.
> 
> The function proc_do_ipc_string was misnamed as it never handled
> strings.  It's magic of when to work with strings and when to work
> with longs belonged in the sysctl table.  I couldn't tell if the
> code would work if you disabled the ipc namespace but it certainly
> looked like it would have problems.
> 
> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

Hi,

A little belated (sorry), but the only comment I have right now on the
patchset is that the get_ipc() seems like it shouldn't take the write
arg.  Perhaps if consistency is the concern, get_uts() should simply
be called get_uts_locked(table, need_write) ?  This also avoids the
mysterious '1' argument in the next patch at get_ipc(table, 1);

Oh, I lied, one more comment.  It seems worth a comment at the top of
get_uts() and get_ipc() explaining that table->data points to
init_uts->data and that's why the 'which = which - init_uts + uts'
works.

thanks,
-serge
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utsname information is shown in the linux banner, which
also is used for /proc/version (which can have different
utsname values inside a uts namespaces). this patch
makes the varying data arguments and changes the string
to a format string, using those arguments.

best,
Herbert

Signed-off-by: Herbert Poetzl <herbert@13thfloor.at>

--- linux-2.6.19/fs/proc/proc_misc.c	2006-11-30 21:19:28 +0100
+++ linux-2.6.19/fs/proc/proc_misc.c	2006-12-04 07:16:28 +0100
@@ -252,8 +252,8 @@ static int version_read_proc(char *page,
 {
 	int len;
 
-	strcpy(page, linux_banner);
-	len = strlen(page);
+	len = sprintf(page, linux_banner,
+		utsname()->release, utsname()->version);
 	return proc_calc_metrics(page, start, off, count, eof, len);
 }
 
--- linux-2.6.19/init/main.c	2006-11-30 21:19:43 +0100
+++ linux-2.6.19/init/main.c	2006-12-04 07:18:44 +0100
@@ -501,7 +501,7 @@ asmlinkage void __init start_kernel(void
 	boot_cpu_init();
 	page_address_init();
 	printk(KERN_NOTICE);
-	printk(linux_banner);
+	printk(linux_banner, UTS_RELEASE, UTS_VERSION);
 	setup_arch(&command_line);
 	unwind_setup();
 	setup_per_cpu_areas();
--- linux-2.6.19/init/version.c	2006-11-30 21:19:43 +0100
+++ linux-2.6.19/init/version.c	2006-12-04 07:14:19 +0100
@@ -35,5 +35,6 @@ struct uts_namespace init_uts_ns = {
 EXPORT_SYMBOL_GPL(init_uts_ns);
 
 const char linux_banner[] =
-	"Linux version " UTS_RELEASE " (" LINUX_COMPILE_BY "@"
-	LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") " UTS_VERSION "\n";
+	"Linux version %s (" LINUX_COMPILE_BY "@"
+	LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") %s\n";
+
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On Mon, Dec 04, 2006 at 11:32:48PM +0100, Herbert Poetzl wrote:
> 
> utsname information is shown in the linux banner, which
> also is used for /proc/version (which can have different
> utsname values inside a uts namespaces). this patch
> makes the varying data arguments and changes the string
> to a format string, using those arguments.
> 
> best,
> Herbert

d'oh! just figured I lost the two new includes required
in main.c, will send an updated version shortly

best,
Herbert

> Signed-off-by: Herbert Poetzl <herbert@13thfloor.at>
> 
> --- linux-2.6.19/fs/proc/proc_misc.c	2006-11-30 21:19:28 +0100
> +++ linux-2.6.19/fs/proc/proc_misc.c	2006-12-04 07:16:28 +0100
> @@ -252,8 +252,8 @@ static int version_read_proc(char *page,
>  {
>  	int len;
>  
> -	strcpy(page, linux_banner);
> -	len = strlen(page);
> +	len = sprintf(page, linux_banner,
> +		utsname()->release, utsname()->version);
>  	return proc_calc_metrics(page, start, off, count, eof, len);
>  }
>  
> --- linux-2.6.19/init/main.c	2006-11-30 21:19:43 +0100
> +++ linux-2.6.19/init/main.c	2006-12-04 07:18:44 +0100
> @@ -501,7 +501,7 @@ asmlinkage void __init start_kernel(void
>  	boot_cpu_init();
>  	page_address_init();
>  	printk(KERN_NOTICE);
> -	printk(linux_banner);
> +	printk(linux_banner, UTS_RELEASE, UTS_VERSION);
>  	setup_arch(&command_line);
>  	unwind_setup();
>  	setup_per_cpu_areas();
> --- linux-2.6.19/init/version.c	2006-11-30 21:19:43 +0100
> +++ linux-2.6.19/init/version.c	2006-12-04 07:14:19 +0100
> @@ -35,5 +35,6 @@ struct uts_namespace init_uts_ns = {
>  EXPORT_SYMBOL_GPL(init_uts_ns);
>  
>  const char linux_banner[] =
> -	"Linux version " UTS_RELEASE " (" LINUX_COMPILE_BY "@"
> -	LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") " UTS_VERSION "\n";
> +	"Linux version %s (" LINUX_COMPILE_BY "@"
> +	LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") %s\n";
> +
> -
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On Tue, Dec 05, 2006 at 06:24:09PM +0100, Herbert Poetzl wrote:
> On Mon, Dec 04, 2006 at 11:32:48PM +0100, Herbert Poetzl wrote:
> > 
> > utsname information is shown in the linux banner, which
> > also is used for /proc/version (which can have different
> > utsname values inside a uts namespaces). this patch
> > makes the varying data arguments and changes the string
> > to a format string, using those arguments.
> > 
> > best,
> > Herbert
> 
> d'oh! just figured I lost the two new includes required
> in main.c, will send an updated version shortly

okay, here is the complete and tested version ...

Signed-off-by: Herbert Poetzl <herbert@13thfloor.at>

--- linux-2.6.19/fs/proc/proc_misc.c	2006-11-30 21:19:28 +0100
+++ linux-2.6.19-banner/fs/proc/proc_misc.c	2006-12-06 07:10:41 +0100
@@ -252,8 +252,8 @@ static int version_read_proc(char *page,
 {
 	int len;
 
-	strcpy(page, linux_banner);
-	len = strlen(page);
+	len = sprintf(page, linux_banner,
+		utsname()->release, utsname()->version);
 	return proc_calc_metrics(page, start, off, count, eof, len);
 }
 
--- linux-2.6.19/init/Makefile	2006-09-20 16:58:44 +0200
+++ linux-2.6.19-banner/init/Makefile	2006-12-06 07:10:41 +0100
@@ -15,6 +15,7 @@ clean-files := ../include/linux/compile.
 
 # dependencies on generated files need to be listed explicitly
 
+$(obj)/main.o: include/linux/compile.h
 $(obj)/version.o: include/linux/compile.h
 
 # compile.h changes depending on hostname, generation number, etc,
--- linux-2.6.19/init/main.c	2006-11-30 21:19:43 +0100
+++ linux-2.6.19-banner/init/main.c	2006-12-06 07:10:41 +0100
@@ -49,6 +49,8 @@
 #include <linux/buffer_head.h>
 #include <linux/debug_locks.h>
 #include <linux/lockdep.h>
+#include <linux/utsrelease.h>
+#include <linux/compile.h>
 
 #include <asm/io.h>
 #include <asm/bugs.h>
@@ -501,7 +503,7 @@ asmlinkage void __init start_kernel(void
 	boot_cpu_init();
 	page_address_init();
 	printk(KERN_NOTICE);
-	printk(linux_banner);
+	printk(linux_banner, UTS_RELEASE, UTS_VERSION);
 	setup_arch(&command_line);
 	unwind_setup();
 	setup_per_cpu_areas();
--- linux-2.6.19/init/version.c	2006-11-30 21:19:43 +0100
+++ linux-2.6.19-banner/init/version.c	2006-12-06 07:10:41 +0100
@@ -35,5 +35,6 @@ struct uts_namespace init_uts_ns = {
 EXPORT_SYMBOL_GPL(init_uts_ns);
 
 const char linux_banner[] =
-	"Linux version " UTS_RELEASE " (" LINUX_COMPILE_BY "@"
-	LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") " UTS_VERSION "\n";
+	"Linux version %s (" LINUX_COMPILE_BY "@"
+	LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") %s\n";
+
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