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arm64: add ptrace regsets for ptrauth key management

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Add two new ptrace regsets, which can be used to request and change the
pointer authentication keys of a thread. NT_ARM_PACA_KEYS gives access
to the instruction/data address keys, and NT_ARM_PACG_KEYS to the
generic authentication key. The keys are also part of the core dump file
of the process.

The regsets are only exposed if the kernel is compiled with
CONFIG_CHECKPOINT_RESTORE=y, as the only intended use case is
checkpointing and restoring processes that are using pointer
authentication. (This can be changed later if there are other use
cases.)

Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Kristina Martsenko
2019-01-30 12:02:44 +00:00
committed by Catalin Marinas
parent e2a2e56e40
commit d0a060be57
4 changed files with 167 additions and 0 deletions
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13
arch/arm64/include/uapi/asm/ptrace.h
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@@ -233,6 +233,19 @@ struct user_pac_mask {
__u64 insn_mask;
};
/* pointer authentication keys (NT_ARM_PACA_KEYS, NT_ARM_PACG_KEYS) */
struct user_pac_address_keys {
__uint128_t apiakey;
__uint128_t apibkey;
__uint128_t apdakey;
__uint128_t apdbkey;
};
struct user_pac_generic_keys {
__uint128_t apgakey;
};
#endif /* __ASSEMBLY__ */
#endif /* _UAPI__ASM_PTRACE_H */