RE: Walking all the physical memory in an x86 system

[Jan Engelhardt]

>[Jon M. Hanson] I tried the filp_open() approach like this:
>
>struct file *mem_fd;
>
>mem_fd = filp_open("/dev/mem", O_RDONLY | O_LARGEFILE, 0);
>
>I then have a check if IS_ERR(mem_fd) is true immediately afterwards
>along with a printk saying it failed. This condition is true when I ran
>it. It seems to fail with -EACCES (permission denied) as the error code.
>
>I can see the exact code that's causing the -EACCES in open_namei(). It
>makes a check if the thing being opened is a character device and
>returns the -EACCES, so obviously filp_open() can't do this.

Mh, non-files... here's a real blind shot: cdev_open



Jan Engelhardt
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