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module: preserve Elf information for livepatch modules
For livepatch modules, copy Elf section, symbol, and string information from the load_info struct in the module loader. Persist copies of the original symbol table and string table. Livepatch manages its own relocation sections in order to reuse module loader code to write relocations. Livepatch modules must preserve Elf information such as section indices in order to apply livepatch relocation sections using the module loader's apply_relocate_add() function. In order to apply livepatch relocation sections, livepatch modules must keep a complete copy of their original symbol table in memory. Normally, a stripped down copy of a module's symbol table (containing only "core" symbols) is made available through module->core_symtab. But for livepatch modules, the symbol table copied into memory on module load must be exactly the same as the symbol table produced when the patch module was compiled. This is because the relocations in each livepatch relocation section refer to their respective symbols with their symbol indices, and the original symbol indices (and thus the symtab ordering) must be preserved in order for apply_relocate_add() to find the right symbol. Signed-off-by: Jessica Yu <[email protected]> Reviewed-by: Miroslav Benes <[email protected]> Acked-by: Josh Poimboeuf <[email protected]> Acked-by: Rusty Russell <[email protected]> Reviewed-by: Rusty Russell <[email protected]> Signed-off-by: Jiri Kosina <[email protected]>
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Jessica Yu
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Jiri Kosina
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Apr 1, 2016
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