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ARM: 9279/1: support function error injection

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This enables HAVE_FUNCTION_ERROR_INJECTION by adding necessary
regs_set_return_value() and override_function_with_return().

Simply tested according to Documentation/fault-injection/fault-injection.rst.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Wang Kefeng 2022-12-04 04:46:40 +01:00 • committed by Russell King (Oracle)
parent ba290d4f1f
commit aaa4dd1b47
4 changed files with 17 additions and 0 deletions
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1
arch/arm/Kconfig
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@ -97,6 +97,7 @@ config ARM
select HAVE_EXIT_THREAD
select HAVE_FAST_GUP if ARM_LPAE
select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL
select HAVE_FUNCTION_ERROR_INJECTION
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FUNCTION_TRACER if !XIP_KERNEL
select HAVE_GCC_PLUGINS

4
arch/arm/include/asm/ptrace.h
View file

@ -163,6 +163,10 @@ static inline unsigned long user_stack_pointer(struct pt_regs *regs)
((current_stack_pointer | (THREAD_SIZE - 1)) - 7) - 1; \
})
static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
{
regs->ARM_r0 = rc;
}
/*
* Update ITSTATE after normal execution of an IT block instruction.

2
arch/arm/lib/Makefile
View file

@ -44,3 +44,5 @@ ifeq ($(CONFIG_KERNEL_MODE_NEON),y)
CFLAGS_xor-neon.o += $(NEON_FLAGS)
obj-$(CONFIG_XOR_BLOCKS) += xor-neon.o
endif
obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o

10
arch/arm/lib/error-inject.c Normal file
View file

@ -0,0 +1,10 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/error-injection.h>
#include <linux/kprobes.h>
void override_function_with_return(struct pt_regs *regs)
{
instruction_pointer_set(regs, regs->ARM_lr);
}
NOKPROBE_SYMBOL(override_function_with_return);