Hi Oleg and Kees- I meant to cc you on this in the first place, but I failed. If you have a few minutes, want to take a peek at these and see if you can poke any holes in them? I'm reasonably confident that they're a considerable improvement over the old state of affairs, but they might still not be perfect. Let me know if you want me to email out a fresh copy. This series applies to tip:x86/asm. --Andy On Mon, Dec 14, 2015 at 10:31 AM, Andy Lutomirski <luto@xxxxxxxxxx> wrote: > This applies on top of the earlier vdso pvclock series I sent out. > Once that lands in -tip, this will apply to -tip. > > This series cleans up the hack that is our vvar mapping. We currently > initialize the vvar mapping as a special mapping vma backed by nothing > whatsoever and then we abuse remap_pfn_range to populate it. > > This cheats the mm core, probably breaks under various evil madvise > workloads, and prevents handling faults in more interesting ways. > > To clean it up, this series: > > - Adds a special mapping .fault operation > - Adds a vm_insert_pfn_prot helper > - Uses the new .fault infrastructure in x86's vdso and vvar mappings > - Hardens the HPET mapping, mitigating an HW attack surface that bothers me > > akpm, can you ack patck 1? > > Changes from v1: > - Lots of changelog clarification requested by akpm > - Minor tweaks to style and comments in the first two patches > > Andy Lutomirski (6): > mm: Add a vm_special_mapping .fault method > mm: Add vm_insert_pfn_prot > x86/vdso: Track each mm's loaded vdso image as well as its base > x86,vdso: Use .fault for the vdso text mapping > x86,vdso: Use .fault instead of remap_pfn_range for the vvar mapping > x86/vdso: Disallow vvar access to vclock IO for never-used vclocks > > arch/x86/entry/vdso/vdso2c.h | 7 -- > arch/x86/entry/vdso/vma.c | 124 ++++++++++++++++++++------------ > arch/x86/entry/vsyscall/vsyscall_gtod.c | 9 ++- > arch/x86/include/asm/clocksource.h | 9 +-- > arch/x86/include/asm/mmu.h | 3 +- > arch/x86/include/asm/vdso.h | 3 - > arch/x86/include/asm/vgtod.h | 6 ++ > include/linux/mm.h | 2 + > include/linux/mm_types.h | 22 +++++- > mm/memory.c | 25 ++++++- > mm/mmap.c | 13 ++-- > 11 files changed, 151 insertions(+), 72 deletions(-) > > -- > 2.5.0 > -- Andy Lutomirski AMA Capital Management, LLC -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>