linux-kernel - Re: [PATCH 2/5] selftests/x86: fix vDSO selftest segfault for vsyscall=none

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Message-ID: <20180211112153.f2ni5mcuut6f6zvq@gmail.com>
Date:   Sun, 11 Feb 2018 12:21:53 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Dominik Brodowski <linux@...inikbrodowski.net>
Cc:     linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        x86@...nel.org, shuah@...nel.org,
        Andrew Lutomirski <luto@...nel.org>
Subject: Re: [PATCH 2/5] selftests/x86: fix vDSO selftest segfault for
 vsyscall=none


* Dominik Brodowski <linux@...inikbrodowski.net> wrote:

> +		char name[128];
> +		if (sscanf(line, "%p-%p %c-%cp %*x %*x:%*x %*u %s",
> +			   &start, &end, &r, &x, name) != 5)

So that's a buffer overflow waiting to happen, if a line in 'maps' gets too large, 
right?

Thanks,

	Ingo