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bef7ec4e8f
Add a section about the requirements of the error injectable functions and the type of errors. Since this section must be read before using ALLOW_ERROR_INJECTION() macro, that section is referred from the comment of the macro too. Link: https://lkml.kernel.org/r/167081321427.387937.15475445689482551048.stgit@devnote3 Link: https://lore.kernel.org/all/20221211115218.2e6e289bb85f8cf53c11aa97@kernel.org/T/#u Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com> Cc: Borislav Petkov (AMD) <bp@alien8.de> Cc: Chris Mason <clm@meta.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Florent Revest <revest@chromium.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Kees Cook <keescook@chromium.org> Cc: KP Singh <kpsingh@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_GENERIC_ERROR_INJECTION_H
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#define _ASM_GENERIC_ERROR_INJECTION_H
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#if defined(__KERNEL__) && !defined(__ASSEMBLY__)
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enum {
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EI_ETYPE_NULL, /* Return NULL if failure */
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EI_ETYPE_ERRNO, /* Return -ERRNO if failure */
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EI_ETYPE_ERRNO_NULL, /* Return -ERRNO or NULL if failure */
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EI_ETYPE_TRUE, /* Return true if failure */
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};
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struct error_injection_entry {
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unsigned long addr;
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int etype;
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};
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struct pt_regs;
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#ifdef CONFIG_FUNCTION_ERROR_INJECTION
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/*
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* Whitelist generating macro. Specify functions which can be error-injectable
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* using this macro. If you unsure what is required for the error-injectable
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* functions, please read Documentation/fault-injection/fault-injection.rst
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* 'Error Injectable Functions' section.
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*/
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#define ALLOW_ERROR_INJECTION(fname, _etype) \
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static struct error_injection_entry __used \
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__section("_error_injection_whitelist") \
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_eil_addr_##fname = { \
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.addr = (unsigned long)fname, \
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.etype = EI_ETYPE_##_etype, \
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}
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void override_function_with_return(struct pt_regs *regs);
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#else
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#define ALLOW_ERROR_INJECTION(fname, _etype)
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static inline void override_function_with_return(struct pt_regs *regs) { }
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#endif
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#endif
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#endif /* _ASM_GENERIC_ERROR_INJECTION_H */
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