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objtool: Update Retpoline validation
Update retpoline validation with the new CONFIG_RETPOLINE requirement of not having bare naked RET instructions. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Borislav Petkov <bp@suse.de>
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@ -75,6 +75,12 @@
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.popsection
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.endm
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/*
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* (ab)use RETPOLINE_SAFE on RET to annotate away 'bare' RET instructions
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* vs RETBleed validation.
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*/
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#define ANNOTATE_UNRET_SAFE ANNOTATE_RETPOLINE_SAFE
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/*
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* JMP_NOSPEC and CALL_NOSPEC macros can be used instead of a simple
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* indirect jmp/call which may be susceptible to the Spectre variant 2
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@ -66,6 +66,7 @@ SYM_FUNC_START(sme_encrypt_execute)
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pop %rbp
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/* Offset to __x86_return_thunk would be wrong here */
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ANNOTATE_UNRET_SAFE
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ret
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int3
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SYM_FUNC_END(sme_encrypt_execute)
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@ -154,6 +155,7 @@ SYM_FUNC_START(__enc_copy)
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pop %r15
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/* Offset to __x86_return_thunk would be wrong here */
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ANNOTATE_UNRET_SAFE
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ret
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int3
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.L__enc_copy_end:
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@ -26,6 +26,7 @@ SYM_CODE_START(hypercall_page)
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.rept (PAGE_SIZE / 32)
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UNWIND_HINT_FUNC
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ANNOTATE_NOENDBR
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ANNOTATE_UNRET_SAFE
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ret
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/*
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* Xen will write the hypercall page, and sort out ENDBR.
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@ -2115,8 +2115,9 @@ static int read_retpoline_hints(struct objtool_file *file)
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}
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if (insn->type != INSN_JUMP_DYNAMIC &&
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insn->type != INSN_CALL_DYNAMIC) {
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WARN_FUNC("retpoline_safe hint not an indirect jump/call",
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insn->type != INSN_CALL_DYNAMIC &&
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insn->type != INSN_RETURN) {
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WARN_FUNC("retpoline_safe hint not an indirect jump/call/ret",
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insn->sec, insn->offset);
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return -1;
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}
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@ -3526,7 +3527,8 @@ static int validate_retpoline(struct objtool_file *file)
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for_each_insn(file, insn) {
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if (insn->type != INSN_JUMP_DYNAMIC &&
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insn->type != INSN_CALL_DYNAMIC)
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insn->type != INSN_CALL_DYNAMIC &&
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insn->type != INSN_RETURN)
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continue;
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if (insn->retpoline_safe)
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@ -3541,9 +3543,14 @@ static int validate_retpoline(struct objtool_file *file)
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if (!strcmp(insn->sec->name, ".init.text") && !opts.module)
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continue;
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WARN_FUNC("indirect %s found in RETPOLINE build",
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insn->sec, insn->offset,
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insn->type == INSN_JUMP_DYNAMIC ? "jump" : "call");
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if (insn->type == INSN_RETURN) {
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WARN_FUNC("'naked' return found in RETPOLINE build",
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insn->sec, insn->offset);
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} else {
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WARN_FUNC("indirect %s found in RETPOLINE build",
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insn->sec, insn->offset,
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insn->type == INSN_JUMP_DYNAMIC ? "jump" : "call");
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}
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warnings++;
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}
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