On Wed, 2008-02-13 at 18:35 +0100, Christian Krafft wrote:
> 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 <[EMAIL PROTECTED]>
The problem is that this prevents using /proc/ioports to access PCI
IO space, which might be useful.
I hate that sensors_detect.. or for that matter any other userland code
that pokes random ports like that. It should die.
Ben.
> 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++;
>
>
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