[PATCH v4 00/11] Add CET shadow stack support

Christina Schimpe
2025-06-17T12:14:13Z

Hi all,

this is my v4 of the series to add amd64 shadow stack support to GDB on linux.
It addresses feedback of Thiago and Eli. Also I added a NEWS part and a
fixup for the test of patch #11. So it would be great if Eli could do a
quick review of the docs part again.

v3 can be found here:
https://sourceware.org/pipermail/gdb-patches/2025-May/217731.html

Changes since v3:
- Apply Thiago's feedback for default method and function description of the
gdbarch hook get_shadow_stack pointer.
- Applied the feedback of Eli for the docs parts as discussed here:
https://sourceware.org/pipermail/gdb-patches/2025-May/218163.html
- Added NEWS for patch #5 and #11.
- Fixed the test of patch #11, which failed for gcc 15 due to changed
assembler.
- Changed to consistent naming "Intel Control-Flow Enforcement Technology"
and commit author from "Schimpe, Christina" to "Christina Schimpe"

I am looking forward to your feedback!

Regards,

Christina

Christina Schimpe (10):
gdbserver: Add optional runtime register set type.
gdbserver: Add assert in x86_linux_read_description.
gdb: Sync up x86-gcc-cpuid.h with cpuid.h from gcc 14 branch.
gdb, gdbserver: Use xstate_bv for target description creation on x86.
gdb, gdbserver: Add support of Intel shadow stack pointer register.
gdb: Handle shadow stack pointer register unwinding for amd64 linux.
gdb, gdbarch: Enable inferior calls for shadow stack support.
gdb: Implement amd64 linux shadow stack support for inferior calls.
gdb, gdbarch: Introduce gdbarch method to get the shadow stack
pointer.
gdb: Enable displaced stepping with shadow stack on amd64 linux.

Felix Willgerodt (1):
gdb: amd64 linux coredump support with shadow stack.

gdb/NEWS | 6 +
gdb/amd64-linux-nat.c | 17 ++
gdb/amd64-linux-tdep.c | 218 +++++++++++++++++-
gdb/amd64-tdep.c | 35 ++-
gdb/amd64-tdep.h | 9 +-
gdb/arch-utils.c | 10 +
gdb/arch-utils.h | 5 +
gdb/arch/amd64-linux-tdesc.c | 33 +--
gdb/arch/amd64-linux-tdesc.h | 7 +-
gdb/arch/amd64.c | 25 +-
gdb/arch/amd64.h | 10 +-
gdb/arch/i386-linux-tdesc.c | 29 +--
gdb/arch/i386-linux-tdesc.h | 5 +-
gdb/arch/i386.c | 19 +-
gdb/arch/i386.h | 8 +-
gdb/arch/x86-linux-tdesc-features.c | 60 ++---
gdb/arch/x86-linux-tdesc-features.h | 25 +-
gdb/doc/gdb.texinfo | 42 ++++
gdb/features/Makefile | 2 +
gdb/features/i386/32bit-ssp.c | 14 ++
gdb/features/i386/32bit-ssp.xml | 11 +
gdb/features/i386/64bit-ssp.c | 14 ++
gdb/features/i386/64bit-ssp.xml | 11 +
gdb/gdbarch-gen.c | 54 +++++
gdb/gdbarch-gen.h | 24 ++
gdb/gdbarch_components.py | 31 +++
gdb/i386-tdep.c | 51 +++-
gdb/i386-tdep.h | 11 +-
gdb/infcall.c | 14 +-
gdb/linux-tdep.c | 47 ++++
gdb/linux-tdep.h | 7 +
gdb/nat/x86-gcc-cpuid.h | 153 +++++++++---
gdb/nat/x86-linux-tdesc.c | 20 +-
gdb/nat/x86-linux-tdesc.h | 7 +-
gdb/nat/x86-linux.c | 55 +++++
gdb/nat/x86-linux.h | 4 +
.../gdb.arch/amd64-shadow-stack-cmds.exp | 141 +++++++++++
.../gdb.arch/amd64-shadow-stack-corefile.exp | 50 ++++
.../gdb.arch/amd64-shadow-stack-disp-step.exp | 90 ++++++++
gdb/testsuite/gdb.arch/amd64-shadow-stack.c | 35 +++
gdb/testsuite/gdb.arch/amd64-ssp.exp | 50 ++++
.../gdb.base/inline-frame-cycle-unwind.py | 4 +
gdb/testsuite/lib/gdb.exp | 70 ++++++
gdb/x86-linux-nat.c | 51 +++-
gdb/x86-linux-nat.h | 11 +
gdb/x86-tdep.c | 21 ++
gdb/x86-tdep.h | 9 +
gdbserver/i387-fp.cc | 40 ++--
gdbserver/linux-amd64-ipa.cc | 10 +-
gdbserver/linux-i386-ipa.cc | 6 +-
gdbserver/linux-low.cc | 50 ++--
gdbserver/linux-low.h | 7 +-
gdbserver/linux-x86-low.cc | 44 +++-
gdbsupport/x86-xstate.h | 7 +-
54 files changed, 1574 insertions(+), 215 deletions(-)
create mode 100644 gdb/features/i386/32bit-ssp.c
create mode 100644 gdb/features/i386/32bit-ssp.xml
create mode 100644 gdb/features/i386/64bit-ssp.c
create mode 100644 gdb/features/i386/64bit-ssp.xml
create mode 100644 gdb/testsuite/gdb.arch/amd64-shadow-stack-cmds.exp
create mode 100644 gdb/testsuite/gdb.arch/amd64-shadow-stack-corefile.exp
create mode 100644 gdb/testsuite/gdb.arch/amd64-shadow-stack-disp-step.exp
create mode 100644 gdb/testsuite/gdb.arch/amd64-shadow-stack.c
create mode 100644 gdb/testsuite/gdb.arch/amd64-ssp.exp

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2.34.1

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