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Date: Tue, 9 Apr 2013 11:47:10 +0530 (IST)
From: P J P <>
To: Dan Carpenter <>
cc: oss security list <>
Subject: Re: CVE Request: kernel information leak in
 fs/compat_ioctl.c VIDEO_SET_SPU_PALETTE

+-- On Mon, 8 Apr 2013, Dan Carpenter wrote --+
| I'm confused why you are using the word "always" and "Unless
| `access_ok()' in `__get_user' returns 0".  I don't understand what
| you are saying.

  Well, always because __access_ok as defined in include/asm-generic/uaccess.h 
always returns true.

static inline int __access_ok(unsigned long addr, unsigned long size)
        return 1;
| Anyway, the bottom line is that the x86 version of get_user()
| doesn't have an info leak and the asm-generic version does.

  I see, that's when asm-generic _access_ok is overridden by another 

Thank you.
Prasad J Pandit / Red Hat Security Response Team
DB7A 84C5 D3F9 7CD1 B5EB  C939 D048 7860 3655 602B

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