linux-kernel - [tip: x86/urgent] x86/uaccess: Add ENDBR to __put_user

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Date:   Tue, 19 Apr 2022 20:08:37 -0000
From:   "tip-bot2 for Josh Poimboeuf" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/urgent] x86/uaccess: Add ENDBR to __put_user_nocheck*()

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

Commit-ID:     7a00829f8ac3f76b3a3aa5c28ce4ddfd2f977bbe
Gitweb:        https://git.kernel.org/tip/7a00829f8ac3f76b3a3aa5c28ce4ddfd2f977bbe
Author:        Josh Poimboeuf <jpoimboe@...hat.com>
AuthorDate:    Mon, 18 Apr 2022 09:50:24 -07:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 19 Apr 2022 21:58:49 +02:00

x86/uaccess: Add ENDBR to __put_user_nocheck*()

The __put_user_nocheck*() inner labels are exported, so in keeping with
the "allow exported functions to be indirectly called" policy, add
ENDBR.

Fixes: ed53a0d97192 ("x86/alternative: Use .ibt_endbr_seal to seal indirect calls")
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lkml.kernel.org/r/207f02177a23031091d1a608de6049a9e5e8ff80.1650300597.git.jpoimboe@redhat.com
---
 arch/x86/lib/putuser.S | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/lib/putuser.S b/arch/x86/lib/putuser.S
index ecb2049..b7dfd60 100644
--- a/arch/x86/lib/putuser.S
+++ b/arch/x86/lib/putuser.S
@@ -48,6 +48,7 @@ SYM_FUNC_START(__put_user_1)
 	cmp %_ASM_BX,%_ASM_CX
 	jae .Lbad_put_user
 SYM_INNER_LABEL(__put_user_nocheck_1, SYM_L_GLOBAL)
+	ENDBR
 	ASM_STAC
 1:	movb %al,(%_ASM_CX)
 	xor %ecx,%ecx
@@ -62,6 +63,7 @@ SYM_FUNC_START(__put_user_2)
 	cmp %_ASM_BX,%_ASM_CX
 	jae .Lbad_put_user
 SYM_INNER_LABEL(__put_user_nocheck_2, SYM_L_GLOBAL)
+	ENDBR
 	ASM_STAC
 2:	movw %ax,(%_ASM_CX)
 	xor %ecx,%ecx
@@ -76,6 +78,7 @@ SYM_FUNC_START(__put_user_4)
 	cmp %_ASM_BX,%_ASM_CX
 	jae .Lbad_put_user
 SYM_INNER_LABEL(__put_user_nocheck_4, SYM_L_GLOBAL)
+	ENDBR
 	ASM_STAC
 3:	movl %eax,(%_ASM_CX)
 	xor %ecx,%ecx
@@ -90,6 +93,7 @@ SYM_FUNC_START(__put_user_8)
 	cmp %_ASM_BX,%_ASM_CX
 	jae .Lbad_put_user
 SYM_INNER_LABEL(__put_user_nocheck_8, SYM_L_GLOBAL)
+	ENDBR
 	ASM_STAC
 4:	mov %_ASM_AX,(%_ASM_CX)
 #ifdef CONFIG_X86_32