linux-kernel - [PATCH 0/2] sysctl: fix range-checking in do_proc_dointvec_minmax

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Date:   Thu, 27 Dec 2018 05:12:28 -0600
From:   Zev Weiss <zev@...ilderbeest.net>
To:     Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH 0/2] sysctl: fix range-checking in do_proc_dointvec_minmax_conv()

Hello,

After being left with an unusable system after a typo executing
something like 'echo $((1<<24)) > /proc/sys/vm/max_map_count', I found
that do_proc_dointvec_minmax_conv() was missing a check to ensure that
the converted value actually fits in an int.

The first of the following patches enhances the sysctl selftest such
that it detects this problem; the second fixes it (wasn't entirely
sure if this would meet the criteria of something that should be sent
to -stable; input welcome).

Thanks,
Zev Weiss