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SubjectRe: module: preserve Elf information for livepatch modules
+++ 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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