linux-kernel - [tip: x86/core] x86/ibt,crypto: Add ENDBR for the jump-table entries

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Message-ID: <164681250431.16921.1083016919469715985.tip-bot2@tip-bot2>
Date:   Wed, 09 Mar 2022 07:55:04 -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,crypto: Add ENDBR for the jump-table entries

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

Commit-ID:     db76667e784428a927cc86b5a6d0cbade416c9e8
Gitweb:        https://git.kernel.org/tip/db76667e784428a927cc86b5a6d0cbade416c9e8
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Tue, 08 Mar 2022 16:30:27 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 08 Mar 2022 23:53:31 +01:00

x86/ibt,crypto: Add ENDBR for the jump-table entries

The code does:

	## branch into array
	mov     jump_table(,%rax,8), %bufp
	JMP_NOSPEC bufp

resulting in needing to mark the jump-table entries with ENDBR.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
Link: https://lore.kernel.org/r/20220308154318.110500806@infradead.org
---
 arch/x86/crypto/crc32c-pcl-intel-asm_64.S | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/crypto/crc32c-pcl-intel-asm_64.S b/arch/x86/crypto/crc32c-pcl-intel-asm_64.S
index 80c0d22..ec35915 100644
--- a/arch/x86/crypto/crc32c-pcl-intel-asm_64.S
+++ b/arch/x86/crypto/crc32c-pcl-intel-asm_64.S
@@ -195,6 +195,7 @@ crc_array:
 .altmacro
 LABEL crc_ %i
 .noaltmacro
+	ENDBR
 	crc32q   -i*8(block_0), crc_init
 	crc32q   -i*8(block_1), crc1
 	crc32q   -i*8(block_2), crc2
@@ -204,6 +205,7 @@ LABEL crc_ %i
 .altmacro
 LABEL crc_ %i
 .noaltmacro
+	ENDBR
 	crc32q   -i*8(block_0), crc_init
 	crc32q   -i*8(block_1), crc1
 # SKIP  crc32  -i*8(block_2), crc2 ; Don't do this one yet
@@ -237,6 +239,7 @@ LABEL crc_ %i
 	################################################################
 
 LABEL crc_ 0
+	ENDBR
 	mov     tmp, len
 	cmp     $128*24, tmp
 	jae     full_block