netdev - Re: [patch -next] bpf: off by one in check_map_func

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] [day] [month] [year] [list]

Date:	Thu, 13 Aug 2015 22:31:50 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Dan Carpenter <dan.carpenter@...cle.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Kaixu Xia <xiakaixu@...wei.com>
CC:	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch -next] bpf: off by one in check_map_func_compatibility()

On 08/13/2015 10:27 PM, Dan Carpenter wrote:
> The loop iterates one space too far, so we might read beyond the end of
> the func_limit[] array.
>
> Fixes: 35578d798400 ('bpf: Implement function bpf_perf_event_read() that get the selected hardware PMU conuter')
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

Thanks for the fix, Dan!

There's however already one queued up here:

https://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=140d8b335a9beb234fd0ed9a15aa6a47f47fd771

> diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
> index 48e1c71..ed12e38 100644
> --- a/kernel/bpf/verifier.c
> +++ b/kernel/bpf/verifier.c
> @@ -853,7 +853,7 @@ static int check_map_func_compatibility(struct bpf_map *map, int func_id)
>   	if (!map)
>   		return 0;
>
> -	for (i = 0; i <= ARRAY_SIZE(func_limit); i++) {
> +	for (i = 0; i < ARRAY_SIZE(func_limit); i++) {
>   		bool_map = (map->map_type == func_limit[i].map_type);
>   		bool_func = (func_id == func_limit[i].func_id);
>   		/* only when map & func pair match it can continue.
> --
> To unsubscribe from this list: send the line "unsubscribe netdev" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html