README.md

openwrt-test-packages

OpenWRT packages feed for test cases for issues I discovered in OpenWRT.

throw-catch-sigsegv

I believe uClibc++ incorrectly implements C++ exception ABI, allocating not enough memory in the "__cxxabiv1::__cxa_allocate_exception" .
That causes memory corruption (buffer overflow) inside "__cxxabiv1::__cxa_throw".
When binary is compiled for OpenWRT's musl standard library, the program crashes with SIGSEGV in the "free" call from "__cxxabiv1::__cxa_free_exception" because musl is very sensitive for memory corruption.

Installing the feed

cd ~/Documents/openwrt
echo "src-git openwrttest https://github.com/coolspot/openwrt-test-packages.git" >> ./feeds.conf
./scripts/feeds update openwrttest
./scripts/feeds install -a -p openwrttest

Building the package

make menuconfig
# In the menuconfig select the package Test/sub-test/throw-catch-sigsegv to be built
make package/throw-catch-sigsegv/install
# Copy the package on the device (or VM)
scp ./bin/malta/packages/openwrttest/throw-catch-sigsegv_2016-02-25_malta_mips.ipk qemu:/tmp/
# on the device (or VM)
root@OpenWrt:~# opkg install /tmp/throw-catch-sigsegv_2016-02-25_malta_mips.ipk

Contact me

Ivan Kold <openwrt at coolspot.33mail.com>