linux-stable.git/arch/s390/include/asm/livepatch.h, branch linux-4.7.y

livepatch: reuse module loader code to write relocations

2016-04-01T13:00:11+00:00

Reuse module loader code to write relocations, thereby eliminating the need
for architecture specific relocation code in livepatch. Specifically, reuse
the apply_relocate_add() function in the module loader to write relocations
instead of duplicating functionality in livepatch's arch-dependent
klp_write_module_reloc() function.

In order to accomplish this, livepatch modules manage their own relocation
sections (marked with the SHF_RELA_LIVEPATCH section flag) and
livepatch-specific symbols (marked with SHN_LIVEPATCH symbol section
index). To apply livepatch relocation sections, livepatch symbols
referenced by relocs are resolved and then apply_relocate_add() is called
to apply those relocations.

In addition, remove x86 livepatch relocation code and the s390
klp_write_module_reloc() function stub. They are no longer needed since
relocation work has been offloaded to module loader.

Lastly, mark the module as a livepatch module so that the module loader
canappropriately identify and initialize it.

Signed-off-by: Jessica Yu 
Reviewed-by: Miroslav Benes 
Acked-by: Josh Poimboeuf 
Acked-by: Heiko Carstens    # for s390 changes
Signed-off-by: Jiri Kosina

klp: remove CONFIG_LIVEPATCH dependency from klp headers

2016-03-06T21:22:10+00:00

There is no need for livepatch.h (generic and arch-specific) to depend
on CONFIG_LIVEPATCH. Remove that superfluous dependency.

Reported-by: Josh Poimboeuf 
Signed-off-by: Jiri Kosina

klp: remove superfluous errors in asm/livepatch.h

2016-03-06T21:19:26+00:00

There is an #error in asm/livepatch.h for both x86 and s390 in
!CONFIG_LIVEPATCH cases. It does not make much sense as pointed out by
Michael Ellerman. One can happily include asm/livepatch.h with
CONFIG_LIVEPATCH. Remove it as useless.

Suggested-by: Michael Ellerman 
Signed-off-by: Miroslav Benes 
Acked-by: Josh Poimboeuf 
Signed-off-by: Jiri Kosina

livepatch: change the error message in asm/livepatch.h header files

2016-01-18T20:35:43+00:00

If anyone includes asm/livepatch.h when CONFIG_LIVEPATCH=n the build
fails with the existing error message. Change it to something saner.

[jkosina@suse.cz: fixed changelog typo spotted by Josh]
Suggested-by: Andrew Morton 
Signed-off-by: Miroslav Benes 
Acked-by: Josh Poimboeuf 
Signed-off-by: Jiri Kosina

livepatch: add support on s390

2015-03-27T14:05:32+00:00

This is a trivial port from kGraft. Module relocations are not supported yet.

Signed-off-by: Jiri Slaby 
Acked-by: Josh Poimboeuf 
Acked-by: Heiko Carstens 
Signed-off-by: Jiri Kosina