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42d038c4fb
Inspired by the commit 7cd01b08d3 ("powerpc: Add support for function
error injection"), this patch supports function error injection for
Arm64.
This patch mainly support two functions: one is regs_set_return_value()
which is used to overwrite the return value; the another function is
override_function_with_return() which is to override the probed
function returning and jump to its caller.
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Will Deacon <will@kernel.org>
18 lines
563 B
C
18 lines
563 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/error-injection.h>
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#include <linux/kprobes.h>
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void override_function_with_return(struct pt_regs *regs)
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{
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/*
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* 'regs' represents the state on entry of a predefined function in
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* the kernel/module and which is captured on a kprobe.
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*
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* When kprobe returns back from exception it will override the end
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* of probed function and directly return to the predefined
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* function's caller.
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*/
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instruction_pointer_set(regs, procedure_link_pointer(regs));
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}
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NOKPROBE_SYMBOL(override_function_with_return);
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