linux-hardening - [RFC PATCH 07/17] objtool: arm64: Decode other system instructions

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Date:   Wed, 20 Jan 2021 18:37:50 +0100
From:   Julien Thierry <jthierry@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     catalin.marinas@....com, will@...nel.org, ardb@...nel.org,
        masahiroy@...nel.org, keescook@...omium.org,
        michal.lkml@...kovi.net, jpoimboe@...hat.com, peterz@...radead.org,
        mark.rutland@....com, broonie@...nel.org,
        linux-efi@...r.kernel.org, linux-hardening@...r.kernel.org,
        Julien Thierry <jthierry@...hat.com>
Subject: [RFC PATCH 07/17] objtool: arm64: Decode other system instructions

Decode ERET, BRK and NOPs

Signed-off-by: Julien Thierry <jthierry@...hat.com>
---
 tools/objtool/arch/arm64/decode.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/objtool/arch/arm64/decode.c b/tools/objtool/arch/arm64/decode.c
index 924121b4b466..a4a587c400a1 100644
--- a/tools/objtool/arch/arm64/decode.c
+++ b/tools/objtool/arch/arm64/decode.c
@@ -223,6 +223,13 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
 			/* Remaining branch opcodes are conditional */
 			*type = INSN_JUMP_CONDITIONAL;
 			*immediate = aarch64_get_branch_offset(insn);
+		} else if (aarch64_insn_is_eret(insn)) {
+			*type = INSN_CONTEXT_SWITCH;
+		} else if (aarch64_insn_is_steppable_hint(insn)) {
+			*type = INSN_NOP;
+		} else if (aarch64_insn_is_brk(insn)) {
+			*immediate = aarch64_insn_decode_immediate(AARCH64_INSN_IMM_16, insn);
+			*type = INSN_BUG;
 		} else {
 			*type = INSN_OTHER;
 		}
-- 
2.25.4