Messages in this thread | | | From | Torsten Duwe <> | Subject | [PATCH v3 0/2] arm64 live patching | Date | Thu, 11 Aug 2016 18:34:51 +0200 (CEST) |
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V3, including suggestions from the replies and 2 fixes.
Reminder: make sure you have a prolog-pad gcc, and this in your top level Makefile:
ifdef CONFIG_LIVEPATCH KBUILD_CFLAGS += $(call cc-option,-fno-ipa-ra) endif
Tested with v4.8-rc1 + gcc-6.1
Changes since v2: * Do not skip initial NOP conversion for CC_USING_PROLOG_PAD, in other words: don't introduce new #ifdefs into generic code. (as requested by Steven Rostedt after my intermediate suggestion) Instead, check in arm64 whether a call to mcount is to be NOPed, and be strict again about the expected "old" instructions. * issue a warning should the compiler not know about -fprolog-pad= (as suggested by Josh Poimboeuf) Only strip the compiler flag proper, not the cpp flag, for critical files. * fix thinko / bummer in live patch return address change detection. Skip the graph caller if the addresses are _not_ equal!
Changes since v1: * instead of a comment "should be CC_USING_PROLOG_PAD": do it. CC_FLAGS_FTRACE holds it now, and the IPA disabler has become a separate issue (see above).
Torsten Duwe (2): arm64: implement FTRACE_WITH_REGS arm64: implement live patching
arch/arm64/Kconfig | 4 ++ arch/arm64/Makefile | 9 ++++ arch/arm64/include/asm/ftrace.h | 8 +++ arch/arm64/include/asm/livepatch.h | 37 ++++++++++++++ arch/arm64/kernel/Makefile | 6 +-- arch/arm64/kernel/entry-ftrace.S | 102 +++++++++++++++++++++++++++++++++++++ arch/arm64/kernel/ftrace.c | 45 ++++++++++++++-- include/asm-generic/vmlinux.lds.h | 2 +- include/linux/compiler.h | 4 ++ 9 files changed, 209 insertions(+), 8 deletions(-) create mode 100644 arch/arm64/include/asm/livepatch.h
-- 2.6.2
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