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SubjectRe: Re: [PATCH v1 1/2] sysctl: cap to ULONG_MAX in proc_get_long()
On Mon, Oct 15, 2018 at 12:32 PM, Christian Brauner
<> wrote:
> On Mon, Oct 15, 2018 at 9:27 PM Alexey Dobriyan <> wrote:
>> > int kstrtoul_bounded(const char *s, unsigned int base,
>> > char **trailing, unsigned long long *res)
>> NO! The whole point is not have million variants of slightly different
>> integer parsing functions.
>> Cap it in the sysctl -- noone would care.
> (Please keep the CC list when replying.)
> Whatever works; I prefer the local strtoul_cap_erange() in kernel/sysctl.c as
> well.

This does match the standard of "evolution" for the kernel: there is
only one user currently, so keep it a static in sysctl.c. If we grow a
greater need, we can move it into lib/.

Reviewed-by: Kees Cook <>


Kees Cook
Pixel Security

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