x86/ibt: Add ANNOTATE_NOENDBR
In order to have objtool warn about code references to !ENDBR instruction, we need an annotation to allow this for non-control-flow instances -- consider text range checks, text patching, or return trampolines etc. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Kees Cook <keescook@chromium.org> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Link: https://lore.kernel.org/r/20220308154317.578968224@infradead.org
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@ -77,6 +77,12 @@ struct unwind_hint {
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#define STACK_FRAME_NON_STANDARD_FP(func)
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#endif
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#define ANNOTATE_NOENDBR \
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"986: \n\t" \
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".pushsection .discard.noendbr\n\t" \
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_ASM_PTR " 986b\n\t" \
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".popsection\n\t"
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#else /* __ASSEMBLY__ */
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/*
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@ -129,6 +135,13 @@ struct unwind_hint {
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.popsection
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.endm
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.macro ANNOTATE_NOENDBR
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.Lhere_\@:
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.pushsection .discard.noendbr
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.quad .Lhere_\@
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.popsection
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.endm
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#endif /* __ASSEMBLY__ */
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#else /* !CONFIG_STACK_VALIDATION */
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@ -139,12 +152,15 @@ struct unwind_hint {
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"\n\t"
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#define STACK_FRAME_NON_STANDARD(func)
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#define STACK_FRAME_NON_STANDARD_FP(func)
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#define ANNOTATE_NOENDBR
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#else
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#define ANNOTATE_INTRA_FUNCTION_CALL
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.macro UNWIND_HINT sp_reg:req sp_offset=0 type:req end=0
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.endm
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.macro STACK_FRAME_NON_STANDARD func:req
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.endm
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.macro ANNOTATE_NOENDBR
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.endm
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#endif
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#endif /* CONFIG_STACK_VALIDATION */
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@ -77,6 +77,12 @@ struct unwind_hint {
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#define STACK_FRAME_NON_STANDARD_FP(func)
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#endif
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#define ANNOTATE_NOENDBR \
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"986: \n\t" \
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".pushsection .discard.noendbr\n\t" \
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_ASM_PTR " 986b\n\t" \
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".popsection\n\t"
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#else /* __ASSEMBLY__ */
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/*
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@ -129,6 +135,13 @@ struct unwind_hint {
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.popsection
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.endm
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.macro ANNOTATE_NOENDBR
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.Lhere_\@:
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.pushsection .discard.noendbr
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.quad .Lhere_\@
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.popsection
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.endm
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#endif /* __ASSEMBLY__ */
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#else /* !CONFIG_STACK_VALIDATION */
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@ -139,12 +152,15 @@ struct unwind_hint {
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"\n\t"
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#define STACK_FRAME_NON_STANDARD(func)
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#define STACK_FRAME_NON_STANDARD_FP(func)
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#define ANNOTATE_NOENDBR
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#else
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#define ANNOTATE_INTRA_FUNCTION_CALL
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.macro UNWIND_HINT sp_reg:req sp_offset=0 type:req end=0
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.endm
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.macro STACK_FRAME_NON_STANDARD func:req
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.endm
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.macro ANNOTATE_NOENDBR
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.endm
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#endif
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#endif /* CONFIG_STACK_VALIDATION */
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