Hi again,
After browsing some of both Linux Device Drivers and Linux Kernel Development, I modified my kernel module code and now I get a kernel oops.
I am trying to hook the sys_write() system call based on some code from my professor.
The section of code that is having problems looks like this:
Char *tbuf = NULL;
tbuf = kmalloc(count, GFP_ATOMIC); // count is passed in from userspace
if (!tbuf)
return -ENOMEM;
if (copy_from_user(&tbuf, buf, count))
return -EFAULT;
printk(KERN_INFO "Copy_from_user succeeded."\n");
kfree(tbuf);
I get a segmentation fault immediately after it prints copy_from_user succeeded into the log.
Oops message:
Oops: 0000 [#9] SMP
And as far as I can tell it is pointing to the kfree function at offset 0xba of 0xc0.
If there is a better place to post this (say a Linux developers list), I am happy to take my questions there, but this list is my first port of call for errors with Linux.
--
Best Regards, Donald
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Donald raikes | Accessibility Specialist/ QA Engineer
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