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
--
Apollo-NG Mobile Hackerspace
https://apollo.open-resource.org/
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