kernel/arch/arm/include/asm/spectre.h, branch linux-rolling-stable

ARM: 9304/1: add prototype for function called only from asm

2023-06-19T08:35:52Z

When building with 'make W=1', the compiler warns about any function definition that does not come with a prototype in a header, to ensure it matches what the caller expects. This includes functions that are only ever caller from assembly code and don't technically need a declaration: arch/arm/kernel/ftrace.c:227:6: error: no previous prototype for 'prepare_ftrace_return' arch/arm/kernel/ptrace.c:850:16: error: no previous prototype for 'syscall_trace_enter' arch/arm/kernel/ptrace.c:878:17: error: no previous prototype for 'syscall_trace_exit' arch/arm/kernel/signal.c:601:1: error: no previous prototype for 'do_work_pending' arch/arm/kernel/signal.c:672:17: error: no previous prototype for 'do_rseq_syscall' arch/arm/kernel/suspend.c:75:6: error: no previous prototype for '__cpu_suspend_save' arch/arm/kernel/traps.c:451:17: error: no previous prototype for 'do_undefinstr' arch/arm/kernel/traps.c:516:39: error: no previous prototype for 'handle_fiq_as_nmi' arch/arm/kernel/traps.c:535:17: error: no previous prototype for 'bad_mode' arch/arm/kernel/traps.c:608:16: error: no previous prototype for 'arm_syscall' arch/arm/kernel/traps.c:734:1: error: no previous prototype for 'baddataabort' arch/arm/kernel/traps.c:774:17: error: no previous prototype for '__div0' arch/arm/kernel/traps.c:97:6: error: no previous prototype for 'dump_backtrace_stm' arch/arm/kernel/unwind.c:40:6: error: no previous prototype for '__aeabi_unwind_cpp_pr0' arch/arm/kernel/unwind.c:45:6: error: no previous prototype for '__aeabi_unwind_cpp_pr1' arch/arm/kernel/unwind.c:50:6: error: no previous prototype for '__aeabi_unwind_cpp_pr2' arch/arm/mm/fault.c:554:1: error: no previous prototype for 'do_DataAbort' arch/arm/mm/fault.c:584:1: error: no previous prototype for 'do_PrefetchAbort' arch/arm/mm/proc-v7-bugs.c:280:6: error: no previous prototype for 'cpu_v7_ca8_ibe' arch/arm/mm/proc-v7-bugs.c:293:6: error: no previous prototype for 'cpu_v7_bugs_init' arch/arm/vdso/vgettimeofday.c:36:6: error: no previous prototype for '__aeabi_unwind_cpp_pr0' arch/arm/vdso/vgettimeofday.c:40:6: error: no previous prototype for '__aeabi_unwind_cpp_pr1' arch/arm/vdso/vgettimeofday.c:44:6: error: no previous prototype for '__aeabi_unwind_cpp_pr2' arch/arm/vfp/vfpmodule.c:323:6: error: no previous prototype for 'VFP_bounce' Add the prototypes anyway, to allow enabling this warning by default in the future. Reviewed-by: Kees Cook Signed-off-by: Arnd Bergmann Signed-off-by: Russell King (Oracle)

ARM: Spectre-BHB: provide empty stub for non-config

2022-03-11T20:42:49Z

When CONFIG_GENERIC_CPU_VULNERABILITIES is not set, references to spectre_v2_update_state() cause a build error, so provide an empty stub for that function when the Kconfig option is not set. Fixes this build error: arm-linux-gnueabi-ld: arch/arm/mm/proc-v7-bugs.o: in function `cpu_v7_bugs_init': proc-v7-bugs.c:(.text+0x52): undefined reference to `spectre_v2_update_state' arm-linux-gnueabi-ld: proc-v7-bugs.c:(.text+0x82): undefined reference to `spectre_v2_update_state' Fixes: b9baf5c8c5c3 ("ARM: Spectre-BHB workaround") Signed-off-by: Randy Dunlap Reported-by: kernel test robot Cc: Russell King Cc: Catalin Marinas Cc: linux-arm-kernel@lists.infradead.org Cc: patches@armlinux.org.uk Acked-by: Russell King (Oracle) Signed-off-by: Linus Torvalds

ARM: Spectre-BHB workaround

2022-03-05T10:42:07Z

Workaround the Spectre BHB issues for Cortex-A15, Cortex-A57, Cortex-A72, Cortex-A73 and Cortex-A75. We also include Brahma B15 as well to be safe, which is affected by Spectre V2 in the same ways as Cortex-A15. Reviewed-by: Catalin Marinas Signed-off-by: Russell King (Oracle)

ARM: report Spectre v2 status through sysfs

2022-03-05T10:41:22Z

As per other architectures, add support for reporting the Spectre vulnerability status via sysfs CPU. Acked-by: Catalin Marinas Signed-off-by: Russell King (Oracle)