linux-kernel - Re: [Patch] kexec_load: check CAP_SYS

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Date:	Thu, 06 Jan 2011 16:27:17 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Amerigo Wang <amwang@...hat.com>
CC:	linux-kernel@...r.kernel.org,
	Eric Biederman <ebiederm@...ssion.com>,
	kexec@...ts.infradead.org, Eric Paris <eparis@...hat.com>
Subject: Re: [Patch] kexec_load: check CAP_SYS_MODULE

(Forgot Cc'ing Eric Paris, adding.)

> Eric pointed out that kexec_load() actually allows you to
> run any code you want in ring0, this is more like CAP_SYS_MODULE.
>
> Reported-by: Eric Paris<eparis@...hat.com>
> Signed-off-by: WANG Cong<amwang@...hat.com>
>
> ---
> diff --git a/kernel/kexec.c b/kernel/kexec.c
> index b55045b..c30d613 100644
> --- a/kernel/kexec.c
> +++ b/kernel/kexec.c
> @@ -945,7 +945,7 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
>   	int result;
>
>   	/* We only trust the superuser with rebooting the system. */
> -	if (!capable(CAP_SYS_BOOT))
> +	if (!capable(CAP_SYS_BOOT) || !capable(CAP_SYS_MODULE))
>   		return -EPERM;
>
>   	/*

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