linux-kernel - Re: [PATCH] perf_counter: fix buffer overflow in perf_copy

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: <19119.14970.129589.518079@cargo.ozlabs.ibm.com>
Date:	Tue, 15 Sep 2009 16:55:54 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf_counter: fix buffer overflow in perf_copy_attr()

Xiao Guangrong writes:

> If we pass a big size data over perf_counter_open syscall, the kernel
> will copy this data to a small buffer, It will cause kernel crash.
> 
> This bug make kernel unsafe and no-root user can trigger it.
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
> ---
>  kernel/perf_counter.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
> index 667ab25..75c46c0 100644
> --- a/kernel/perf_counter.c
> +++ b/kernel/perf_counter.c
> @@ -4216,6 +4216,7 @@ static int perf_copy_attr(struct perf_counter_attr __user *uattr,
>  			if (val)
>  				goto err_size;
>  		}
> +		size = sizeof(*attr);

Looks right to me.

Acked-by: Paul Mackerras <paulus@...ba.org>
--
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/