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Clean up Shadow Call Stack patches for 5.8

Will Deacon linux-arm-kernel lkml 1 version In review

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b4 am [email protected]

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  1. v1 Latest6 patches 20 repliesIn review

Patches in v1 No applies recorded yet

#Subject and filesSizeRepliesApplied
1/6arm64: scs: Store absolute SCS stack pointer value in thread_infoarch/arm64/include/asm/scs.h arch/arm64/include/asm/thread_info.h arch/arm64/kernel/asm-offsets.c +2 more+12 -142 replies
2/6scs: Move accounting into alloc/free functionskernel/scs.c+21 -242 replies
3/6arm64: scs: Use 'scs_sp' register alias for x18arch/arm64/include/asm/scs.h arch/arm64/kernel/entry.S arch/arm64/kernel/head.S+10 -83 replies
4/6scs: Move scs_overflow_check() out of architecture codearch/arm64/include/asm/scs.h arch/arm64/kernel/process.c arch/arm64/kernel/scs.c +3 more+8 -245 replies
5/6scs: Remove references to asm/scs.h from core codearch/Kconfig kernel/scs.c+2 -31 reply
6/6scs: Move DEFINE_SCS macro into core codearch/arm64/kernel/scs.c include/linux/scs.h+4 -43 replies

Reviews trailers per patch

All 6 patches have a Reviewed-by or Acked-by.

PatchMark Rutland
1/6R-b
2/6R-b
3/6R-b
4/6R-b
5/6R-b
6/6R-b

Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.

Read the v1 thread

Cover letter [PATCH 0/6] Clean up Shadow Call Stack patches for 5.8

Hi all,

Here's a series of cleanups I hacked together on top of a modified v13 of the Shadow Call Stack patches from Sami:

https://lore.kernel.org/r/20200515172355.GD23334@willie-the-truck

The main changes are:

* Move code out of arch/arm64 and into the core implementation
* Store the full SCS stack pointer instead of the offset
* Code simplification and general style things

I'd like to queue this on top early next week so that it can spend some quality time in linux-next.

Cheers,

Will

Cc Sami Tolvanen <[email protected]>
Cc Kees Cook <[email protected]>
Cc Catalin Marinas <[email protected]>
Cc Mark Rutland <[email protected]>
Cc Jann Horn <[email protected]>
Cc Ard Biesheuvel <[email protected]>
Cc Peter Zijlstra <[email protected]>

--->8

Will Deacon (6):
arm64: scs: Store absolute SCS stack pointer value in thread_info
scs: Move accounting into alloc/free functions
arm64: scs: Use 'scs_sp' register alias for x18
scs: Move scs_overflow_check() out of architecture code
scs: Remove references to asm/scs.h from core code
scs: Move DEFINE_SCS macro into core code

 arch/Kconfig                         |  4 +--
 arch/arm64/include/asm/scs.h         | 29 ++++------------
 arch/arm64/include/asm/thread_info.h |  4 +--
 arch/arm64/kernel/asm-offsets.c      |  2 +-
 arch/arm64/kernel/entry.S            | 10 +++---
 arch/arm64/kernel/head.S             |  2 +-
 arch/arm64/kernel/process.c          |  2 --
 arch/arm64/kernel/scs.c              |  6 +---
 include/linux/scs.h                  | 16 +++++----
 kernel/sched/core.c                  |  3 ++
 kernel/scs.c                         | 52 +++++++++++++---------------
 11 files changed, 55 insertions(+), 75 deletions(-)
Signature · 1 line
2.26.2.761.g0e0b3e54be-goog