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Message-Id: <20251120222105.us.687-kees@kernel.org> Date: Thu, 20 Nov 2025 14:21:05 -0800 From: Kees Cook <kees@...nel.org> To: Qing Zhao <qing.zhao@...cle.com> Cc: Kees Cook <kees@...nel.org>, Uros Bizjak <ubizjak@...il.com>, Joseph Myers <josmyers@...hat.com>, Richard Biener <rguenther@...e.de>, Jeff Law <jeffreyalaw@...il.com>, Andrew Pinski <pinskia@...il.com>, Jakub Jelinek <jakub@...hat.com>, Martin Uecker <uecker@...raz.at>, Peter Zijlstra <peterz@...radead.org>, Ard Biesheuvel <ardb@...nel.org>, Jan Hubicka <hubicka@....cz>, Richard Earnshaw <richard.earnshaw@....com>, Richard Sandiford <richard.sandiford@....com>, Marcus Shawcroft <marcus.shawcroft@....com>, Kyrylo Tkachov <kyrylo.tkachov@....com>, Kito Cheng <kito.cheng@...il.com>, Palmer Dabbelt <palmer@...belt.com>, Andrew Waterman <andrew@...ive.com>, Jim Wilson <jim.wilson.gcc@...il.com>, Dan Li <ashimida.1990@...il.com>, Sami Tolvanen <samitolvanen@...gle.com>, Ramon de C Valle <rcvalle@...gle.com>, Joao Moreira <joao@...rdrivepizza.com>, Nathan Chancellor <nathan@...nel.org>, Bill Wendling <morbo@...gle.com>, "Osterlund, Sebastian" <sebastian.osterlund@...el.com>, "Constable, Scott D" <scott.d.constable@...el.com>, gcc-patches@....gnu.org, linux-hardening@...r.kernel.org Subject: [PATCH v8 0/7] Introduce Kernel Control Flow Integrity ABI [PR107048] Hi, This series implements[1][2] the Linux Kernel Control Flow Integrity ABI, which provides a function prototype based forward edge control flow integrity protection by instrumenting every indirect call to check for a hash value before the target function address. If the hash at the call site and the hash at the target do not match, execution will trap. I'm hoping we can land front- and middle-end and do architectures as they also pass review. What do folks think? I'd really like to get this in a position where more people can test with GCC snapshots, etc. Thanks! -Kees Changes since v7[3], thanks to Jeff Law pointing out CI issues[4]: - Fix various code style issues reported by contrib/check_GNU_style.py. - Support more vector types seen with specific RISC-V targets. - Do not inherit nor pollute DEFAULT_CFLAGS from kcfi.exp. [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107048 [2] https://github.com/KSPP/linux/issues/369 [3] https://lore.kernel.org/linux-hardening/20251117201219.makes.617-kees@kernel.org/ [4] https://github.com/ewlu/gcc-precommit-ci/issues/4115#issue-3634981101 Kees Cook (7): typeinfo: Introduce KCFI typeinfo mangling API kcfi: Add core Kernel Control Flow Integrity infrastructure kcfi: Add regression test suite x86: Add x86_64 Kernel Control Flow Integrity implementation aarch64: Add AArch64 Kernel Control Flow Integrity implementation arm: Add ARM 32-bit Kernel Control Flow Integrity implementation riscv: Add RISC-V Kernel Control Flow Integrity implementation gcc/kcfi.h | 59 ++ gcc/kcfi.cc | 696 ++++++++++++++++++ gcc/config/aarch64/aarch64-protos.h | 5 + gcc/config/arm/arm-protos.h | 4 + gcc/config/i386/i386-protos.h | 2 +- gcc/config/i386/i386.h | 3 +- gcc/config/riscv/riscv-protos.h | 3 + gcc/config/aarch64/aarch64.md | 66 +- gcc/config/arm/arm.md | 62 ++ gcc/config/i386/i386.md | 63 +- gcc/config/riscv/riscv.md | 76 +- gcc/config/aarch64/aarch64.cc | 105 +++ gcc/config/arm/arm.cc | 170 +++++ gcc/config/i386/i386-expand.cc | 22 +- gcc/config/i386/i386-options.cc | 13 + gcc/config/i386/i386.cc | 189 ++++- gcc/config/riscv/riscv.cc | 170 +++++ gcc/doc/extend.texi | 137 ++++ gcc/doc/invoke.texi | 127 ++++ gcc/doc/tm.texi | 32 + gcc/testsuite/gcc.dg/kcfi/kcfi.exp | 51 ++ gcc/testsuite/lib/target-supports.exp | 14 + .../gcc.dg/builtin-typeinfo-errors.c | 28 + gcc/testsuite/gcc.dg/builtin-typeinfo.c | 350 +++++++++ gcc/testsuite/gcc.dg/kcfi/kcfi-adjacency.c | 114 +++ gcc/testsuite/gcc.dg/kcfi/kcfi-arm-fixed-ip.c | 15 + .../gcc.dg/kcfi/kcfi-arm-fixed-r12.c | 15 + gcc/testsuite/gcc.dg/kcfi/kcfi-basics.c | 149 ++++ gcc/testsuite/gcc.dg/kcfi/kcfi-call-sharing.c | 90 +++ .../gcc.dg/kcfi/kcfi-cold-partition.c | 126 ++++ .../gcc.dg/kcfi/kcfi-complex-addressing.c | 203 +++++ .../gcc.dg/kcfi/kcfi-complex-addressing.s | 0 .../gcc.dg/kcfi/kcfi-ipa-robustness.c | 54 ++ .../gcc.dg/kcfi/kcfi-move-preservation.c | 118 +++ .../gcc.dg/kcfi/kcfi-no-sanitize-inline.c | 100 +++ gcc/testsuite/gcc.dg/kcfi/kcfi-no-sanitize.c | 39 + .../gcc.dg/kcfi/kcfi-offset-validation.c | 38 + .../gcc.dg/kcfi/kcfi-patchable-entry-only.c | 64 ++ .../gcc.dg/kcfi/kcfi-patchable-incompatible.c | 7 + .../gcc.dg/kcfi/kcfi-patchable-large.c | 54 ++ .../gcc.dg/kcfi/kcfi-patchable-medium.c | 60 ++ .../gcc.dg/kcfi/kcfi-patchable-prefix-only.c | 61 ++ .../gcc.dg/kcfi/kcfi-riscv-fixed-t1.c | 17 + .../gcc.dg/kcfi/kcfi-riscv-fixed-t2.c | 17 + .../gcc.dg/kcfi/kcfi-riscv-fixed-t3.c | 17 + gcc/testsuite/gcc.dg/kcfi/kcfi-runtime.c | 276 +++++++ gcc/testsuite/gcc.dg/kcfi/kcfi-tail-calls.c | 140 ++++ .../gcc.dg/kcfi/kcfi-trap-encoding.c | 69 ++ gcc/testsuite/gcc.dg/kcfi/kcfi-trap-section.c | 29 + gcc/testsuite/gcc.dg/kcfi/kcfi-x86-arity.c | 93 +++ .../gcc.dg/kcfi/kcfi-x86-fixed-r10.c | 17 + .../gcc.dg/kcfi/kcfi-x86-fixed-r11.c | 17 + .../gcc.dg/kcfi/kcfi-x86-retpoline-r11.c | 40 + gcc/Makefile.in | 2 + gcc/c-family/c-common.h | 1 + gcc/flag-types.h | 2 + gcc/gimple.h | 22 + gcc/kcfi-typeinfo.h | 32 + gcc/tree-pass.h | 1 + gcc/c-family/c-attribs.cc | 17 +- gcc/c-family/c-common.cc | 2 + gcc/c/c-parser.cc | 72 ++ gcc/common.opt | 8 + gcc/df-scan.cc | 7 + gcc/doc/tm.texi.in | 12 + gcc/final.cc | 3 + gcc/kcfi-typeinfo.cc | 516 +++++++++++++ gcc/opts.cc | 2 + gcc/passes.cc | 1 + gcc/passes.def | 1 + gcc/rtl.def | 6 + gcc/rtlanal.cc | 5 + gcc/target.def | 39 + gcc/toplev.cc | 12 + gcc/tree-inline.cc | 10 + gcc/varasm.cc | 37 +- 76 files changed, 5244 insertions(+), 52 deletions(-) create mode 100644 gcc/kcfi.h create mode 100644 gcc/kcfi.cc create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi.exp create mode 100644 gcc/testsuite/gcc.dg/builtin-typeinfo-errors.c create mode 100644 gcc/testsuite/gcc.dg/builtin-typeinfo.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-adjacency.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-arm-fixed-ip.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-arm-fixed-r12.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-basics.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-call-sharing.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-cold-partition.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-complex-addressing.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-complex-addressing.s create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-ipa-robustness.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-move-preservation.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-no-sanitize-inline.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-no-sanitize.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-offset-validation.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-patchable-entry-only.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-patchable-incompatible.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-patchable-large.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-patchable-medium.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-patchable-prefix-only.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-riscv-fixed-t1.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-riscv-fixed-t2.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-riscv-fixed-t3.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-runtime.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-tail-calls.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-trap-encoding.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-trap-section.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-x86-arity.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-x86-fixed-r10.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-x86-fixed-r11.c create mode 100644 gcc/testsuite/gcc.dg/kcfi/kcfi-x86-retpoline-r11.c create mode 100644 gcc/kcfi-typeinfo.h create mode 100644 gcc/kcfi-typeinfo.cc -- 2.34.1
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