[patch] uts-semaphore fix for sparc64 solaris emu for kernel-2.6.9-rc1-bk6

["Alexander Stohr" <Alexander.Stohr@gmx.de>]

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Hello,

when copy-to-user and alikes does fail 
for the solaris personality on sparc64
did fail then it is possible that the
current function gets left with an error
without prior releasing the uts-semphore.

the attached diff provides a patch that
is supposed to fixe that behaviour.
i was not able to test test this in the wild
due to lack of the respective hardware, so 
any reports from machine owners would be nice.

-Alex.

PS: please CC me on replys, i am not subscribed to this list.

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diff -Nur linux-2.6.9-rc1-bk6.orig/arch/sparc64/solaris/misc.c linux-2.6.9-rc1-bk6/arch/sparc64/solaris/misc.c
--- linux-2.6.9-rc1-bk6.orig/arch/sparc64/solaris/misc.c	2004-08-25 07:38:42.000000000 +0200
+++ linux-2.6.9-rc1-bk6/arch/sparc64/solaris/misc.c	2004-08-31 12:30:29.000000000 +0200
@@ -137,20 +137,22 @@
 	return sunos_brk(brk);
 }
 
-#define set_utsfield(to, from, dotchop, countfrom) {			\
-	char *p; 							\
-	int i, len = (countfrom) ? 					\
-		((sizeof(to) > sizeof(from) ? 				\
-			sizeof(from) : sizeof(to))) : sizeof(to); 	\
-	if (copy_to_user(to, from, len))				\
-		return -EFAULT;						\
-	if (dotchop) 							\
-		for (p=from,i=0; *p && *p != '.' && --len; p++,i++); 	\
-	else 								\
-		i = len - 1; 						\
-	if (__put_user('\0', (char __user *)((to)+i)))			\
-		return -EFAULT;						\
-}
+#define set_utsfield(to, from, dotchop, countfrom, perror) do {			\
+	char *p; 								\
+	int i, len = (countfrom) ? 						\
+		((sizeof(to) > sizeof(from) ? 					\
+			sizeof(from) : sizeof(to))) : sizeof(to); 		\
+	if (copy_to_user(to, from, len))					\
+		*perror = -EFAULT;						\
+	else {									\
+		if (dotchop) 							\
+			for (p=from,i=0; *p && *p != '.' && --len; p++,i++); 	\
+		else 								\
+			i = len - 1; 						\
+		if (__put_user('\0', (char __user *)((to)+i)))			\
+			*perror = -EFAULT;					\
+	}									\
+} while (0)
 
 struct sol_uname {
 	char sysname[9];
@@ -221,15 +223,17 @@
 	struct sol_uname __user *v = A(buf);
 	switch (which) {
 	case 0:	/* old uname */
-		/* Let's cheat */
-		set_utsfield(v->sysname, "SunOS", 1, 0);
-		down_read(&uts_sem);
-		set_utsfield(v->nodename, system_utsname.nodename, 1, 1);
-		up_read(&uts_sem);
-		set_utsfield(v->release, "2.6", 0, 0);
-		set_utsfield(v->version, "Generic", 0, 0);
-		set_utsfield(v->machine, machine(), 0, 0);
-		return 0;
+		{	int error = 0;
+			/* Let's cheat */
+			set_utsfield(v->sysname, "SunOS", 1, 0, &error);
+			down_read(&uts_sem);
+			set_utsfield(v->nodename, system_utsname.nodename, 1, 1, &error);
+			up_read(&uts_sem);
+			set_utsfield(v->release, "2.6", 0, 0, &error);
+			set_utsfield(v->version, "Generic", 0, 0, &error);
+			set_utsfield(v->machine, machine(), 0, 0, &error);
+			return error;
+		}
 	case 2: /* ustat */
 		return -ENOSYS;
 	case 3: /* fusers */
@@ -241,16 +245,17 @@
 
 asmlinkage int solaris_utsname(u32 buf)
 {
+	int error = 0;
 	struct sol_utsname __user *v = A(buf);
 	/* Why should we not lie a bit? */
 	down_read(&uts_sem);
-	set_utsfield(v->sysname, "SunOS", 0, 0);
-	set_utsfield(v->nodename, system_utsname.nodename, 1, 1);
-	set_utsfield(v->release, "5.6", 0, 0);
-	set_utsfield(v->version, "Generic", 0, 0);
-	set_utsfield(v->machine, machine(), 0, 0);
+	set_utsfield(v->sysname, "SunOS", 0, 0, &error);
+	set_utsfield(v->nodename, system_utsname.nodename, 1, 1, &error);
+	set_utsfield(v->release, "5.6", 0, 0, &error);
+	set_utsfield(v->version, "Generic", 0, 0, &error);
+	set_utsfield(v->machine, machine(), 0, 0, &error);
 	up_read(&uts_sem);
-	return 0;
+	return error;
 }
 
 #define SI_SYSNAME		1       /* return name of operating system */