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Re: [PATCH v3] Race between cat /proc/kallsyms and rmmod [message #11332 is a reply to message #11328]

Mon, 19 March 2007 15:20

Paulo Marques
Messages: 7
Registered: March 2007

Junior Member

Alexey Dobriyan wrote:
> Iterating code of /proc/kallsyms calls module_get_kallsym() which grabs
> and drops module_mutex internally and returns "struct module *",
> module is removed, aforementioned "struct module *" is used in non-trivial
> way.
>
> Steps to reproduce:
>
> modprobe/rmmod loop
> cat /proc/kallsyms >/dev/null loop
>
> Copy all needed info under module_mutex.
>
> NOTE: this patch keeps module_mutex static.

Yes, this patch fixes the "cat /proc/kallsyms" race without changing any
"external" interfaces, so I think it should go into mainline in any case.

Acked-by: Paulo Marques <pmarques@grupopie.com>

--
Paulo Marques - www.grupopie.com

"All I ask is a chance to prove that money can't make me happy."

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[Message index]

		[PATCH RESEND 1/2] Race between cat /proc/kallsyms and rmmod By: Alexey Dobriyan on Fri, 16 March 2007 11:35
		[PATCH v3] Race between cat /proc/kallsyms and rmmod By: Alexey Dobriyan on Mon, 19 March 2007 14:25
		Re: [PATCH v3] Race between cat /proc/kallsyms and rmmod By: Paulo Marques on Mon, 19 March 2007 15:20
		Re: [PATCH v3] Race between cat /proc/kallsyms and rmmod By: Rusty Russell on Mon, 19 March 2007 23:35

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