Re: [lm-sensors] [PATCH] sensors-detect: Skip "random" I/O port

[Christian Krafft <krafft@de.ibm.com>]

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Hi Ben,

regarding your problem with poking into PCI ranges:
As arnd mentioned, we could check, wether there is a mapping for that address
and if so, allow the access. That could be done in check_legacy_ioport,
although the name looks a bit misleading.
What do you think ?

On Fri, 22 Feb 2008 18:21:23 +1100
Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:

> 
> Christian, can you re-send me that patch ?
> 
> Ben.

Sure, patch was as trivial as this:


sensors_detect crashes kernel on PowerPC, as it pokes directly to memory.
This patch adds a check_legacy_ioports to read_port and write_port.
It will now return ENXIO, instead of oopsing.

Signed-off-by: Christian Krafft <krafft@de.ibm.com>

Index: linux.git/drivers/char/mem.c
===================================================================
--- linux.git.orig/drivers/char/mem.c
+++ linux.git/drivers/char/mem.c
@@ -566,8 +566,13 @@ static ssize_t read_port(struct file * f
 	char __user *tmp = buf;
 
 	if (!access_ok(VERIFY_WRITE, buf, count))
-		return -EFAULT; 
+		return -EFAULT;
+
 	while (count-- > 0 && i < 65536) {
+#ifdef CONFIG_PPC_MERGE
+		if (check_legacy_ioport(i))
+			return -ENXIO;
+#endif
 		if (__put_user(inb(i),tmp) < 0) 
 			return -EFAULT;  
 		i++;
@@ -585,6 +590,7 @@ static ssize_t write_port(struct file * 
 
 	if (!access_ok(VERIFY_READ,buf,count))
 		return -EFAULT;
+
 	while (count-- > 0 && i < 65536) {
 		char c;
 		if (__get_user(c, tmp)) {
@@ -592,6 +598,10 @@ static ssize_t write_port(struct file * 
 				break;
 			return -EFAULT; 
 		}
+#ifdef CONFIG_PPC_MERGE
+		if (check_legacy_ioport(i))
+			return -ENXIO;
+#endif
 		outb(c,i);
 		i++;
 		tmp++;


-- 
Mit freundlichen Gruessen,
kind regards,

Christian Krafft
IBM Systems & Technology Group,
Linux Kernel Development
IT Specialist


Vorsitzender des Aufsichtsrats:	Martin Jetter
Geschaeftsfuehrung:		Herbert Kircher
Sitz der Gesellschaft:		Boeblingen
Registriergericht:		Amtsgericht Stuttgart, HRB 243294

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