On Mon 2015-11-30 23:21:15, Jessica Yu wrote:
> 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@xxxxxxxxxx>
> ---
> 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
I would hide this into a structure. It is 3 pointers and 6 integers
that are mostly unused. I think about using a pointer to struct load_info
here. We could set the unused stuff to zero and NULL.
Any better idea how to share the definition with struct load_info
is welcome.
Best Regards,
Petr
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