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Subject[PATCH 0/2] sysctl: fix range-checking in do_proc_dointvec_minmax_conv()

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).

Zev Weiss

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