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authorJessica Yu <jeyu@redhat.com>2016-08-17 20:58:29 -0400
committerJiri Kosina <jkosina@suse.cz>2016-08-18 23:41:55 +0200
commitd4c3e6e1b193497da3a2ce495fb1db0243e41e37 (patch)
tree8d0307b2403b25fd7aa808a01e59d62d6f9fa202 /arch/x86/kernel/Makefile
parent255e732c61dbb6a0bf9e0a3d6bc45f202853c880 (diff)
livepatch/x86: apply alternatives and paravirt patches after relocations
Implement arch_klp_init_object_loaded() for x86, which applies alternatives/paravirt patches. This fixes the order in which relocations and alternatives/paravirt patches are applied. Previously, if a patch module had alternatives or paravirt patches, these were applied first by the module loader before livepatch can apply per-object relocations. The (buggy) sequence of events was: (1) Load patch module (2) Apply alternatives and paravirt patches to patch module * Note that these are applied to the new functions in the patch module (3) Apply per-object relocations to patch module when target module loads. * This clobbers what was written in step 2 This lead to crashes and corruption in general, since livepatch would overwrite or step on previously applied alternative/paravirt patches. The correct sequence of events should be: (1) Load patch module (2) Apply per-object relocations to patch module (3) Apply alternatives and paravirt patches to patch module This is fixed by delaying paravirt/alternatives patching until after relocations are applied. Any .altinstructions or .parainstructions sections are prefixed with ".klp.arch.${objname}" and applied in arch_klp_init_object_loaded(). Signed-off-by: Jessica Yu <jeyu@redhat.com> Acked-by: Miroslav Benes <mbenes@suse.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'arch/x86/kernel/Makefile')
-rw-r--r--arch/x86/kernel/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 0503f5bfb18d..4f656fe156fd 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -83,6 +83,7 @@ obj-$(CONFIG_X86_MPPARSE) += mpparse.o
obj-y += apic/
obj-$(CONFIG_X86_REBOOTFIXUPS) += reboot_fixups_32.o
obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
+obj-$(CONFIG_LIVEPATCH) += livepatch.o
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
obj-$(CONFIG_FTRACE_SYSCALLS) += ftrace.o
obj-$(CONFIG_X86_TSC) += trace_clock.o