Pointer Authentication (PAuth) is a security feature introduced in ARMv8.3. It introduces instructions to sign addresses and later check for potential corruption using a second modifier value and one of a set of keys. The signature, in the form of the Pointer Authentication Code (PAC), is stored in some of the top unused bits of the virtual address (e.g. [54: 49] if TBID0 is enabled and TnSZ is set to use a 48 bit VA space). A set of controls are present to enable/disable groups of instructions (which use certain keys) for compatibility with libraries that do not utilize the feature. PAuth is used to verify the integrity of return addresses on the stack with less memory than the stack canary.
This patchset adds kselftests to verify the kernel's configuration of the feature and its runtime behaviour. There are 7 tests which verify that: * an authentication failure leads to a SIGSEGV * the data/instruction instruction groups are enabled * the generic instructions are enabled * all 5 keys are unique for a single thread * exec() changes all keys to new unique ones * context switching preserves the 4 data/instruction keys * context switching preserves the generic keys
The tests have been verified to work on qemu without a working PAUTH Implementation and on ARM's FVP with a full or partial PAuth implementation.
Changes in v2: * remove extra lines at end of files * Patch 1: "kselftests: add a basic arm64 Pointer Authentication test" * add checks for a compatible compiler in Makefile * Patch 4: "kselftests: add PAuth tests for single threaded consistency and key uniqueness" * rephrase comment for clarity in pac.c
Cc: Shuah Khan shuah@kernel.org Cc: Catalin Marinas catalin.marinas@arm.com Cc: Will Deacon will@kernel.org Reviewed-by: Vincenzo Frascino Vincenzo.Frascino@arm.com Reviewed-by: Amit Daniel Kachhap amit.kachhap@arm.com Signed-off-by: Boyan Karatotev boyan.karatotev@arm.com
Boyan Karatotev (4): kselftests/arm64: add a basic Pointer Authentication test kselftests/arm64: add nop checks for PAuth tests kselftests/arm64: add PAuth test for whether exec() changes keys kselftests/arm64: add PAuth tests for single threaded consistency and key uniqueness
tools/testing/selftests/arm64/Makefile | 2 +- .../testing/selftests/arm64/pauth/.gitignore | 2 + tools/testing/selftests/arm64/pauth/Makefile | 39 ++ .../selftests/arm64/pauth/exec_target.c | 35 ++ tools/testing/selftests/arm64/pauth/helper.c | 40 ++ tools/testing/selftests/arm64/pauth/helper.h | 29 ++ tools/testing/selftests/arm64/pauth/pac.c | 348 ++++++++++++++++++ .../selftests/arm64/pauth/pac_corruptor.S | 35 ++ 8 files changed, 529 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/arm64/pauth/.gitignore create mode 100644 tools/testing/selftests/arm64/pauth/Makefile create mode 100644 tools/testing/selftests/arm64/pauth/exec_target.c create mode 100644 tools/testing/selftests/arm64/pauth/helper.c create mode 100644 tools/testing/selftests/arm64/pauth/helper.h create mode 100644 tools/testing/selftests/arm64/pauth/pac.c create mode 100644 tools/testing/selftests/arm64/pauth/pac_corruptor.S
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