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| /freebsd-10.2-release/sys/kern/ | ||
| H A D | link_elf.c | diff 240997 Thu Sep 27 14:55:29 MDT 2012 trociny Kernel and modules have "set_vnet" linker set, where virtualized global variables are placed. When a module is loaded by link_elf linker its variables from "set_vnet" linker set are copied to the kernel "set_vnet" ("modspace") and all references to these variables inside the module are relocated accordingly. The issue is when a module is loaded that has references to global variables from another, previously loaded module: these references are not relocated so an invalid address is used when the module tries to access the variable. The example is V_layer3_chain, defined in ipfw module and accessed from ipfw_nat. The same issue is with DPCPU variables, which use "set_pcpu" linker set. Fix this making the link_elf linker on a module load recognize "external" DPCPU/VNET variables defined in the previously loaded modules and relocate them accordingly. For this set_pcpu_list and set_vnet_list are used, where the addresses of modules' "set_pcpu" and "set_vnet" linker sets are stored. Note, archs that use link_elf_obj (amd64) were not affected by this issue. Reviewed by: jhb, julian, zec (initial version) MFC after: 1 month |
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