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Linaro GCC 4.6-2013.05 incorrectly pads the arpt_arp structure on at least the ar71xx target, resulting in a two bytes shorter struct in the kernel compared to what arptables userspace expects. When comparing sizeof(struct arpt_arp) in kernel and userspace, the former yields 162 byte, while the latter is 164 byte. As a consequence, the subsequent target_offset and next_offset members of the parent arpt_entry structure contain invalid values when processed by the arptables binary, leading to bad memory accesses in the populate_cache() procedure, subsequently causing a segfault. Signed-off-by: Jo-Philipp Wich <jow@openwrt.org> SVN-Revision: 38999 |
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