From: Borislav Petkov <[email protected]> Hi all,
this is something which hpa and I talked about recently: the ability for the alternatives code to add padding to the original instruction in case the replacement is longer and also to be able to simply write "jmp" and not care about which JMP exactly the compiler generates and whether the relative offsets are correct. So this is a stab at it, it seems to boot in kvm here but it needs more staring to make sure we're actually generating the proper code at all times. Thus the RFC tag, comments/suggestions are welcome. Thanks. Borislav Petkov (4): x86, copy_user: Remove FIX_ALIGNMENT define x86, alternatives: Cleanup DPRINTK macro alternatives: Add instruction padding alternatives: Make JMPs more robust arch/x86/include/asm/alternative-asm.h | 38 ++++++++++ arch/x86/include/asm/alternative.h | 34 +++++---- arch/x86/include/asm/cpufeature.h | 12 +-- arch/x86/kernel/alternative.c | 130 +++++++++++++++++++++++++++------ arch/x86/lib/copy_page_64.S | 34 ++++----- arch/x86/lib/copy_user_64.S | 44 ++--------- 6 files changed, 193 insertions(+), 99 deletions(-) -- 2.2.0.33.gc18b867 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
