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6982934e19
When the kernel is compiled with pointer auth instructions, the boot CPU needs to start using address auth very early, so change the cpucap to account for this. Pointer auth must be enabled before we call C functions, because it is not possible to enter a function with pointer auth disabled and exit it with pointer auth enabled. Note, mismatches between architected and IMPDEF algorithms will still be caught by the cpufeature framework (the separate *_ARCH and *_IMP_DEF cpucaps). Note the change in behavior: if the boot CPU has address auth and a late CPU does not, then the late CPU is parked by the cpufeature framework. This is possible as kernel will only have NOP space intructions for PAC so such mismatched late cpu will silently ignore those instructions in C functions. Also, if the boot CPU does not have address auth and the late CPU has then the late cpu will still boot but with ptrauth feature disabled. Leave generic authentication as a "system scope" cpucap for now, since initially the kernel will only use address authentication. Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Reviewed-by: Vincenzo Frascino <Vincenzo.Frascino@arm.com> Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com> [Amit: Re-worked ptrauth setup logic, comments] Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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