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From: Cong Wang <>
To: Subhashini Rao Beerisetty <>
Cc: "Randy Dunlap" <>,
	"Valdis Klētnieks" <>,
	LKML <>,
	kernelnewbies <>
Subject: Re: general protection fault vs Oops
Date: Sun, 17 May 2020 13:46:39 -0700
Message-ID: <> (raw)
In-Reply-To: <>

On Sat, May 16, 2020 at 9:16 AM Subhashini Rao Beerisetty
<> wrote:
> Yes, those are out-of-tree modules. Basically, my question is, in
> general what is the difference between 'general protection fault' and
> 'Oops' failure in kernel mode.

For your case, they are likely just different consequences of a same
memory error. Let's assume it is a use-after-free, the behavior is UAF
is undefined: If that memory freed by kernel is also unmapped from
kernel address space, you would get a page fault when using it
afterward, that is an Oops. Or if that memory freed by kernel gets
reallocated and remapped as read-only, you would get a general
protection error when you writing to it afterward.

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Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-16 12:35 Subhashini Rao Beerisetty
2020-05-16 13:53 ` Valdis Klētnieks
2020-05-16 15:10   ` Subhashini Rao Beerisetty
2020-05-16 15:59   ` Randy Dunlap
2020-05-16 16:15     ` Subhashini Rao Beerisetty
2020-05-17 20:46       ` Cong Wang [this message]
2020-05-18  5:45         ` Subhashini Rao Beerisetty

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