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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/arm64/kernel/probes/decode-insn.c
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@@ -1,16 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * arch/arm64/kernel/probes/decode-insn.c
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  *
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  * Copyright (C) 2013 Linaro Limited.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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- * General Public License for more details.
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  */
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 #include <linux/kernel.h>
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@@ -37,7 +29,8 @@
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 		    aarch64_insn_is_msr_imm(insn) ||
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 		    aarch64_insn_is_msr_reg(insn) ||
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 		    aarch64_insn_is_exception(insn) ||
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-		    aarch64_insn_is_eret(insn))
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+		    aarch64_insn_is_eret(insn) ||
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+		    aarch64_insn_is_eret_auth(insn))
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 			return false;
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 		/*
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@@ -50,11 +43,13 @@
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 			     != AARCH64_INSN_SPCLREG_DAIF;
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 		/*
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-		 * The HINT instruction is is problematic when single-stepping,
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-		 * except for the NOP case.
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+		 * The HINT instruction is steppable only if it is in whitelist
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+		 * and the rest of other such instructions are blocked for
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+		 * single stepping as they may cause exception or other
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+		 * unintended behaviour.
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 		 */
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 		if (aarch64_insn_is_hint(insn))
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-			return aarch64_insn_is_nop(insn);
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+			return aarch64_insn_is_steppable_hint(insn);
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 		return true;
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 	}