Messages in this thread Patch in this message | | | Date | Tue, 1 Dec 2015 03:48:59 -0500 | From | Jessica Yu <> | Subject | Re: module: preserve Elf information for livepatch modules |
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+++ Jessica Yu [30/11/15 23:21 -0500]: >For livepatch modules, copy Elf section, symbol, and string information >from the load_info struct in the module loader. > >Livepatch uses special relocation sections in order to be able to patch >modules that are not yet loaded, as well as apply patches to the kernel >when the addresses of symbols cannot be determined at compile time (for >example, when kaslr is enabled). Livepatch modules must preserve Elf >information such as section indices in order to apply the remaining >relocation sections at the appropriate time (i.e. when the target module >loads). > >Signed-off-by: Jessica Yu <jeyu@redhat.com> >--- > include/linux/module.h | 9 +++++ > kernel/module.c | 98 ++++++++++++++++++++++++++++++++++++++++++++++++-- > 2 files changed, 105 insertions(+), 2 deletions(-) > >diff --git a/include/linux/module.h b/include/linux/module.h >index 3a19c79..9b46256 100644 >--- a/include/linux/module.h >+++ b/include/linux/module.h >@@ -425,6 +425,14 @@ struct module { > > /* Notes attributes */ > struct module_notes_attrs *notes_attrs; >+ >+ /* Elf information (optionally saved) */ >+ Elf_Ehdr *hdr; >+ Elf_Shdr *sechdrs; >+ char *secstrings; >+ struct { >+ unsigned int sym, str, mod, vers, info, pcpu; >+ } index; > #endif > > /* The command line arguments (may be mangled). People like >@@ -461,6 +469,7 @@ struct module { > #endif > > #ifdef CONFIG_LIVEPATCH >+ bool klp; /* Is this a livepatch module? */
Gah. I believe this field should be outside the #ifdef.
Jessica
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