This series reworks arm64's syscall handling to minimize the propagation of user-controlled register values into speculated code paths. As with x86 [1], a wrapper is generated for each syscall, which extracts the argument from a struct pt_regs. During kernel entry from userspace, registers are zeroed. The arm64 kernel code directly invokes some syscalls which the x86 code doesn't, so I've added ksys_* wrappers for these, following the x86 example. The rest of the series is arm64-specific. I've pushed the series out to my arm64/syscall-regs branch [2] on kernel.org. Thanks, Mark. [1] https://lkml.kernel.org/r/20180330093720.6780-1-linux@xxxxxxxxxxxxxxxxxxxx [2] git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git Mark Rutland (18): arm64: consistently use unsigned long for thread flags arm64: move SCTLR_EL{1,2} assertions to <asm/sysreg.h> arm64: introduce sysreg_clear_set() arm64: kill config_sctlr_el1() arm64: kill change_cpacr() arm64: move sve_user_{enable,disable} to <asm/fpsimd.h> arm64: remove sigreturn wrappers arm64: convert raw syscall invocation to C arm64: convert syscall trace logic to C arm64: convert native/compat syscall entry to C arm64: zero GPRs upon entry from EL0 kernel: add ksys_personality() kernel: add kcompat_sys_{f,}statfs64() arm64: remove in-kernel call to sys_personality() arm64: use {COMPAT,}SYSCALL_DEFINE0 for sigreturn arm64: use SYSCALL_DEFINE6() for mmap arm64: convert compat wrappers to C arm64: implement syscall wrappers arch/arm64/Kconfig | 1 + arch/arm64/include/asm/fpsimd.h | 17 ++++- arch/arm64/include/asm/syscall_wrapper.h | 80 ++++++++++++++++++++ arch/arm64/include/asm/sysreg.h | 33 ++++---- arch/arm64/include/asm/unistd32.h | 26 +++---- arch/arm64/kernel/Makefile | 5 +- arch/arm64/kernel/armv8_deprecated.c | 8 +- arch/arm64/kernel/cpu_errata.c | 3 +- arch/arm64/kernel/entry.S | 126 +++---------------------------- arch/arm64/kernel/entry32.S | 121 ----------------------------- arch/arm64/kernel/fpsimd.c | 20 ----- arch/arm64/kernel/signal.c | 5 +- arch/arm64/kernel/signal32.c | 6 +- arch/arm64/kernel/sys.c | 19 +++-- arch/arm64/kernel/sys32.c | 116 ++++++++++++++++++++++++---- arch/arm64/kernel/syscall.c | 113 +++++++++++++++++++++++++++ arch/arm64/kernel/traps.c | 4 +- arch/arm64/mm/fault.c | 2 +- fs/statfs.c | 14 +++- include/linux/syscalls.h | 9 +++ kernel/exec_domain.c | 7 +- 21 files changed, 411 insertions(+), 324 deletions(-) create mode 100644 arch/arm64/include/asm/syscall_wrapper.h delete mode 100644 arch/arm64/kernel/entry32.S create mode 100644 arch/arm64/kernel/syscall.c -- 2.11.0
