+++ 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@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
/* 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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