On 06/07/2012 12:41 PM, Jean-Yves Avenard wrote: > Hello > > This is my first post here, so hopefully I'm doing it the right way. > > I recently an Asus RT-N66U router, powered by a Broadcom BCM5300. MIPS > based obviously. > > I am an infrequent committer of the Tomato firmware team. > One issue was reported that caused quite surprising problems. We call > it the "ug" bug. > > In a shell: > cd /tmp > echo "#!/bin/sh" >bug > echo 'echo -n $1.' >>bug > chmod +x bug > for i in 0 1 2 3 4 5 6 7 8 9; do bug $i; done > > would result in random data being output. > Typically it would look something like: > ug.1.ug.3.ug.5.ug.ug.ug.ug.root@RT-N66U:/tmp# > > This issue affects a few other firmware (ddwrt) in particular. This > doesn't affect Asus stock firmware > > After a short investigation, I ruled out that the problem was either > in uclibc or busybox and is something related to an issue in the > kernel > > Looking at the kernel shipped with the Asus, they have made some > modifications in how pages are initialised... > > The following patch, is a port of the required changes that fix the > memory corruption exposed by the "ug" bug... > > Let me know if you would like this patch to be submitted differently. > Not knowing the submit policy, I put it inline, but due to the > presence of tabs (ugh!) it may not come out properly. > > The patch is for the linux that ships with Tomato obviously, but > checking the linux git repository, it will apply with minor mod. Let > me know if you want me to do those mods for you.. > > Best regards > Jean-Yves Avenard Hi, this is a little late but I haven't seen this earlier. I just tried your script and had no problems on my Asus RT-N66U running OpenWrt with kernel 3.10.24. This problem was either cause by some other non upstream Broadcom modification or was already fixed in mainline kernel. root@OpenWrt:~# cd /tmp root@OpenWrt:/tmp# echo "#!/bin/sh" >bug root@OpenWrt:/tmp# echo 'echo -n $1.' >>bug root@OpenWrt:/tmp# cat bug #!/bin/sh echo -n $1. root@OpenWrt:/tmp# chmod +x bug root@OpenWrt:/tmp# for i in 0 1 2 3 4 5 6 7 8 9; do ./bug $i; done 0.1.2.3.4.5.6.7.8.9.root@OpenWrt:/tmp# root@OpenWrt:/tmp# Hauke
