https://github.com/torvalds/linux
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Tip revision: 521a547ced6477c54b4b0cc206000406c221b4d6 authored by Linus Torvalds on 18 September 2022, 20:44:14 UTC
Linux 6.0-rc6
Tip revision: 521a547
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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