On 10/17/2013 05:40 PM, chrono wrote:
> Ahoi everyone,
>
> it was requested on IRC that I send my solution to the entropy problem
> with the current
> kernel (e.g. having 0 available entropy):
>
> root@OpenWrt:/# cat /proc/sys/kernel/random/entropy_avail
> 0
>
> In the build root I've patched
>
> build_dir/linux-ar71xx_nand/linux-3.3.8/arch/mips/include/asm/timex.h
>
> --- timex.h?id=refs%2Ftags%2Fv3.3.8 2013-10-17 17:23:12.000000000 +0200
> +++ timex.h 2013-10-17 17:07:59.888938183 +0200
> @@ -35,7 +35,13 @@
>
> static inline cycles_t get_cycles(void)
> {
> - return 0;
> +
> + if (cpu_has_counter) {
> + return read_c0_count();
> + }
> + else {
> + return 0; /* no usable counter */
> + }
> }
>
> #endif /* __KERNEL__ */
>
> After applying and rebuilding the kernel:
>
> root@OpenWrt:/# cat /proc/sys/kernel/random/entropy_avail
> 162
>
> This was tested on mips32r2/24kc (Mikrotik Routerboard 450G) but it
> might work
> for others as well. Until this is fixed upstream and openwrt follows up
> with
> the kernel, it might be an easy fix for some people in order to have better
> entropy for SSL/VPN.
>
> Hopefully it will be useful to someone,
>
> chrono
A similar patch was applied to trunk in r38834.
Hauke
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