linux/kernel/entry/Makefile

# SPDX-License-Identifier: GPL-2.0

# Prevent the noinstr section from being pestered by sanitizer and other goodies
# as long as these things cannot be disabled per function.
KASAN_SANITIZE := n
UBSAN_SANITIZE := n
KCOV_INSTRUMENT := n

CFLAGS_REMOVE_common.o	 = -fstack-protector -fstack-protector-strong
CFLAGS_common.o		+= -fno-stack-protector

obj-$(CONFIG_GENERIC_ENTRY) += common.o
entry: Provide generic syscall entry functionality On syscall entry certain work needs to be done: - Establish state (lockdep, context tracking, tracing) - Conditional work (ptrace, seccomp, audit...) This code is needlessly duplicated and different in all architectures. Provide a generic version based on the x86 implementation which has all the RCU and instrumentation bits right. As interrupt/exception entry from user space needs parts of the same functionality, provide a function for this as well. syscall_enter_from_user_mode() and irqentry_enter_from_user_mode() must be called right after the low level ASM entry. The calling code must be non-instrumentable. After the functions returns state is correct and the subsequent functions can be instrumented. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Kees Cook <keescook@chromium.org> Link: https://lkml.kernel.org/r/20200722220519.513463269@linutronix.de 2020-07-22 21:59:56 +00:00			`# SPDX-License-Identifier: GPL-2.0`

			`# Prevent the noinstr section from being pestered by sanitizer and other goodies`
			`# as long as these things cannot be disabled per function.`
			`KASAN_SANITIZE := n`
			`UBSAN_SANITIZE := n`
			`KCOV_INSTRUMENT := n`

			`CFLAGS_REMOVE_common.o = -fstack-protector -fstack-protector-strong`
			`CFLAGS_common.o += -fno-stack-protector`

			`obj-$(CONFIG_GENERIC_ENTRY) += common.o`