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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: ed53a0d971 ("x86/alternative: Use .ibt_endbr_seal to seal indirect calls")
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/207f02177a23031091d1a608de6049a9e5e8ff80.1650300597.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf 2022-04-18 09:50:24 -07:00 committed by Peter Zijlstra
parent 1c0513dec4
commit 7a00829f8a
1 changed files with 4 additions and 0 deletions
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4
arch/x86/lib/putuser.S
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@ -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