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Date:   Fri, 12 May 2017 09:16:20 +0200
From:   Geert Uytterhoeven <>
To:     Michael Schmitz <>
Cc:     Theodore Tso <>,
        "" <>,
        "Linux/m68k" <>
Subject: Re: [RFC] fix race in drivers/char/random.c:get_reg()

On Sun, Apr 30, 2017 at 9:49 AM, Michael Schmitz <> wrote:
> get_reg() can be reentered on architectures with prioritized interrupts
> (m68k in this case), causing f->reg_index to be incremented after the
> range check. Out of bounds memory access past the pt_regs struct results.
> This will go mostly undetected unless access is beyond end of memory.
> Prevent the race by disabling interrupts in get_reg().
> Tested on m68k (Atari Falcon, and ARAnyM emulator).
> Kudos to Geert Uytterhoeven for helping to trace this race.
> Signed-off-by: Michael Schmitz <>

No comments from anyone?

Perhaps this wasn't clear, but (a) an access beyond end of memory crashes
the system, and (b) this is reproducible on Atari systems.




Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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