On Tue, Jun 05, 2018 at 10:42:23AM +0200, Jessica Yu wrote: > Livepatch modules are special in that we preserve their entire symbol > tables in order to be able to apply relocations after module load. The > unwanted side effect of this is that undefined (SHN_UNDEF) symbols of > livepatch modules are accessible via the kallsyms api and this can > confuse symbol resolution in livepatch (klp_find_object_symbol()) and > cause subtle bugs in livepatch. > > Have the module kallsyms api skip over SHN_UNDEF symbols. These symbols > are usually not available for normal modules anyway as we cut down their > symbol tables to just the core (non-undefined) symbols, so this should > really just affect livepatch modules. Note that this patch doesn't > affect the display of undefined symbols in /proc/kallsyms. > > Reported-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> > Tested-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> > Signed-off-by: Jessica Yu <jeyu@xxxxxxxxxx> Reviewed-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> -- Josh -- To unsubscribe from this list: send the line "unsubscribe live-patching" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
