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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4D257CE5.1030001@redhat.com>
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;
>
>   	/*

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/