X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=kernel%2Fsysctl.c;h=e0ac6cd79fcf6955c6105815b4c8ab4d9d53e97f;hb=7cda93e008e1a477970adbf82dba81a5d4f0ae40;hp=130c5ec9ee0b3f699c3da72617db844154ce5910;hpb=edb16bec41db68b22799a5fbad82c3891e637565;p=linux-2.6

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 130c5ec9ee..e0ac6cd79f 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -65,7 +65,6 @@ extern int sysctl_overcommit_memory;
 extern int sysctl_overcommit_ratio;
 extern int sysctl_panic_on_oom;
 extern int max_threads;
-extern int sysrq_enabled;
 extern int core_uses_pid;
 extern int suid_dumpable;
 extern char core_pattern[];
@@ -152,6 +151,8 @@ static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen,
 #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);
+static int proc_dointvec_taint(ctl_table *table, int write, struct file *filp,
+			       void __user *buffer, size_t *lenp, loff_t *ppos);
 #endif
 
 static ctl_table root_table[];
@@ -175,6 +176,7 @@ extern ctl_table inotify_table[];
 int sysctl_legacy_va_layout;
 #endif
 
+
 static void *get_uts(ctl_table *table, int write)
 {
 	char *which = table->data;
@@ -345,14 +347,16 @@ static ctl_table kern_table[] = {
 		.proc_handler	= &proc_dostring,
 		.strategy	= &sysctl_string,
 	},
+#ifdef CONFIG_PROC_SYSCTL
 	{
 		.ctl_name	= KERN_TAINTED,
 		.procname	= "tainted",
 		.data		= &tainted,
 		.maxlen		= sizeof(int),
-		.mode		= 0444,
-		.proc_handler	= &proc_dointvec,
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_taint,
 	},
+#endif
 	{
 		.ctl_name	= KERN_CAP_BSET,
 		.procname	= "cap-bound",
@@ -543,7 +547,7 @@ static ctl_table kern_table[] = {
 	{
 		.ctl_name	= KERN_SYSRQ,
 		.procname	= "sysrq",
-		.data		= &sysrq_enabled,
+		.data		= &__sysrq_enabled,
 		.maxlen		= sizeof (int),
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec,
@@ -1682,13 +1686,12 @@ static int _proc_do_string(void* data, int maxlen, int write,
 	size_t len;
 	char __user *p;
 	char c;
-	
-	if (!data || !maxlen || !*lenp ||
-	    (*ppos && !write)) {
+
+	if (!data || !maxlen || !*lenp) {
 		*lenp = 0;
 		return 0;
 	}
-	
+
 	if (write) {
 		len = 0;
 		p = buffer;
@@ -1709,6 +1712,15 @@ static int _proc_do_string(void* data, int maxlen, int write,
 		len = strlen(data);
 		if (len > maxlen)
 			len = maxlen;
+
+		if (*ppos > len) {
+			*lenp = 0;
+			return 0;
+		}
+
+		data += *ppos;
+		len  -= *ppos;
+
 		if (len > *lenp)
 			len = *lenp;
 		if (len)
@@ -1928,6 +1940,7 @@ int proc_dointvec(ctl_table *table, int write, struct file *filp,
 
 #define OP_SET	0
 #define OP_AND	1
+#define OP_OR	2
 
 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
 				      int *valp,
@@ -1939,6 +1952,7 @@ static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
 		switch(op) {
 		case OP_SET:	*valp = val; break;
 		case OP_AND:	*valp &= val; break;
+		case OP_OR:	*valp |= val; break;
 		}
 	} else {
 		int val = *valp;
@@ -1962,7 +1976,7 @@ int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
 {
 	int op;
 
-	if (!capable(CAP_SYS_MODULE)) {
+	if (write && !capable(CAP_SYS_MODULE)) {
 		return -EPERM;
 	}
 
@@ -1971,6 +1985,22 @@ int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
 				do_proc_dointvec_bset_conv,&op);
 }
 
+/*
+ *	Taint values can only be increased
+ */
+static int proc_dointvec_taint(ctl_table *table, int write, struct file *filp,
+			       void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+	int op;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	op = OP_OR;
+	return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
+				do_proc_dointvec_bset_conv,&op);
+}
+
 struct do_proc_dointvec_minmax_conv_param {
 	int *min;
 	int *max;
@@ -2554,17 +2584,23 @@ int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
 		void __user *oldval, size_t __user *oldlenp,
 		void __user *newval, size_t newlen)
 {
-	if (oldval) {
+	if (oldval && oldlenp) {
 		size_t olen;
-		if (oldlenp) { 
-			if (get_user(olen, oldlenp))
+
+		if (get_user(olen, oldlenp))
+			return -EFAULT;
+		if (olen) {
+			int val;
+
+			if (olen < sizeof(int))
+				return -EINVAL;
+
+			val = *(int *)(table->data) / HZ;
+			if (put_user(val, (int __user *)oldval))
+				return -EFAULT;
+			if (put_user(sizeof(int), oldlenp))
 				return -EFAULT;
-			if (olen!=sizeof(int))
-				return -EINVAL; 
 		}
-		if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
-		    (oldlenp && put_user(sizeof(int),oldlenp)))
-			return -EFAULT;
 	}
 	if (newval && newlen) { 
 		int new;
@@ -2582,17 +2618,23 @@ int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
 		void __user *oldval, size_t __user *oldlenp,
 		void __user *newval, size_t newlen)
 {
-	if (oldval) {
+	if (oldval && oldlenp) {
 		size_t olen;
-		if (oldlenp) { 
-			if (get_user(olen, oldlenp))
+
+		if (get_user(olen, oldlenp))
+			return -EFAULT;
+		if (olen) {
+			int val;
+
+			if (olen < sizeof(int))
+				return -EINVAL;
+
+			val = jiffies_to_msecs(*(int *)(table->data));
+			if (put_user(val, (int __user *)oldval))
+				return -EFAULT;
+			if (put_user(sizeof(int), oldlenp))
 				return -EFAULT;
-			if (olen!=sizeof(int))
-				return -EINVAL; 
 		}
-		if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
-		    (oldlenp && put_user(sizeof(int),oldlenp)))
-			return -EFAULT;
 	}
 	if (newval && newlen) { 
 		int new;
@@ -2733,12 +2775,14 @@ static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
 {
 	return -ENOSYS;
 }
+#ifdef CONFIG_SYSVIPC
 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)
 {
 	return -ENOSYS;
 }
+#endif
 #endif /* CONFIG_SYSCTL_SYSCALL */
 
 /*