Messages in this thread | | | Date | Mon, 15 Feb 2016 11:48:57 +0000 (GMT) | From | EunTaik Lee <> | Subject | Re: Re: [PATCH RESEND] arm64: add alignment fault hanling |
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> How do you end up with Device nGnRnE in user space? I thought we should > have got some guard page. I guess it is a device file that is mmaped in the user space and later remapped in the kernel using pgprot_noncached(). I can't find the code that inserts a guard page in between vma's can you please help me find that code?
> do_strncpy_from_user() relies on unsafe_get_user() not being able to > read 8 bytes. The problem now is that it doesn't get a page fault but an > alignment one is isn't handled. Yes.
> Why addr >= TASK_SIZE? addr here should be the fault address, not pc. You're right. I should have used user_mode(regs).
> The simplest would be to use do_bad_area() here without any additional > function. Yes, I should've probably used do_bad_area(). I just wanted to do the minimal stuff.
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