https://github.com/torvalds/linux
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Tip revision: f2906aa863381afb0015a9eb7fefad885d4e5a56 authored by Linus Torvalds on 06 June 2022, 00:18:54 UTC
Linux 5.19-rc1
Tip revision: f2906aa
error-inject.c
// SPDX-License-Identifier: GPL-2.0

#include <linux/linkage.h>
#include <linux/error-injection.h>
#include <linux/kprobes.h>
#include <linux/objtool.h>

asmlinkage void just_return_func(void);

asm(
	".text\n"
	".type just_return_func, @function\n"
	".globl just_return_func\n"
	"just_return_func:\n"
		ANNOTATE_NOENDBR
		ASM_RET
	".size just_return_func, .-just_return_func\n"
);

void override_function_with_return(struct pt_regs *regs)
{
	regs->ip = (unsigned long)&just_return_func;
}
NOKPROBE_SYMBOL(override_function_with_return);
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