linux-kernel - [tip: x86/core] x86/ibt,ftrace: Annotate ftrace code patching

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Date:   Tue, 15 Mar 2022 10:43:54 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/core] x86/ibt,ftrace: Annotate ftrace code patching

The following commit has been merged into the x86/core branch of tip:

Commit-ID:     3215de84c06d747bb748b98945add83e3ec8a6e2
Gitweb:        https://git.kernel.org/tip/3215de84c06d747bb748b98945add83e3ec8a6e2
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Tue, 08 Mar 2022 16:30:41 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 15 Mar 2022 10:32:41 +01:00

x86/ibt,ftrace: Annotate ftrace code patching

These are code patching sites, not indirect targets.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
Link: https://lore.kernel.org/r/20220308154318.936599479@infradead.org
---
 arch/x86/kernel/ftrace_64.S | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/x86/kernel/ftrace_64.S b/arch/x86/kernel/ftrace_64.S
index e32b5cd..4ec1360 100644
--- a/arch/x86/kernel/ftrace_64.S
+++ b/arch/x86/kernel/ftrace_64.S
@@ -145,6 +145,7 @@ SYM_FUNC_START(ftrace_caller)
 	movq %rcx, RSP(%rsp)
 
 SYM_INNER_LABEL(ftrace_caller_op_ptr, SYM_L_GLOBAL)
+	ANNOTATE_NOENDBR
 	/* Load the ftrace_ops into the 3rd parameter */
 	movq function_trace_op(%rip), %rdx
 
@@ -155,6 +156,7 @@ SYM_INNER_LABEL(ftrace_caller_op_ptr, SYM_L_GLOBAL)
 	movq $0, CS(%rsp)
 
 SYM_INNER_LABEL(ftrace_call, SYM_L_GLOBAL)
+	ANNOTATE_NOENDBR
 	call ftrace_stub
 
 	/* Handlers can change the RIP */
@@ -169,6 +171,7 @@ SYM_INNER_LABEL(ftrace_call, SYM_L_GLOBAL)
 	 * layout here.
 	 */
 SYM_INNER_LABEL(ftrace_caller_end, SYM_L_GLOBAL)
+	ANNOTATE_NOENDBR
 
 	jmp ftrace_epilogue
 SYM_FUNC_END(ftrace_caller);
@@ -192,6 +195,7 @@ SYM_FUNC_START(ftrace_regs_caller)
 	/* save_mcount_regs fills in first two parameters */
 
 SYM_INNER_LABEL(ftrace_regs_caller_op_ptr, SYM_L_GLOBAL)
+	ANNOTATE_NOENDBR
 	/* Load the ftrace_ops into the 3rd parameter */
 	movq function_trace_op(%rip), %rdx
 
@@ -221,6 +225,7 @@ SYM_INNER_LABEL(ftrace_regs_caller_op_ptr, SYM_L_GLOBAL)
 	leaq (%rsp), %rcx
 
 SYM_INNER_LABEL(ftrace_regs_call, SYM_L_GLOBAL)
+	ANNOTATE_NOENDBR
 	call ftrace_stub
 
 	/* Copy flags back to SS, to restore them */
@@ -248,6 +253,7 @@ SYM_INNER_LABEL(ftrace_regs_call, SYM_L_GLOBAL)
 	 */
 	testq	%rax, %rax
 SYM_INNER_LABEL(ftrace_regs_caller_jmp, SYM_L_GLOBAL)
+	ANNOTATE_NOENDBR
 	jnz	1f
 
 	restore_mcount_regs
@@ -261,6 +267,7 @@ SYM_INNER_LABEL(ftrace_regs_caller_jmp, SYM_L_GLOBAL)
 	 * to the return.
 	 */
 SYM_INNER_LABEL(ftrace_regs_caller_end, SYM_L_GLOBAL)
+	ANNOTATE_NOENDBR
 	jmp ftrace_epilogue
 
 	/* Swap the flags with orig_rax */