提交 6d2b391b 编写于 作者: P Peter Zijlstra 提交者: Zheng Zengkai

objtool/x86: Ignore __x86_indirect_alt_* symbols

stable inclusion
from stable-v5.10.133
commit f231b2ee8533d79b93bd163e93caf578d991726b
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5PTAS
CVE: CVE-2022-29900,CVE-2022-23816,CVE-2022-29901

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=f231b2ee8533d79b93bd163e93caf578d991726b

--------------------------------

commit 31197d3a upstream.

Because the __x86_indirect_alt* symbols are just that, objtool will
try and validate them as regular symbols, instead of the alternative
replacements that they are.

This goes sideways for FRAME_POINTER=y builds; which generate a fair
amount of warnings.

Fixes: 9bc0bb50 ("objtool/x86: Rewrite retpoline thunk calls")
Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: NIngo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/YNCgxwLBiK9wclYJ@hirez.programming.kicks-ass.netSigned-off-by: NBen Hutchings <ben@decadent.org.uk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NLin Yujun <linyujun809@huawei.com>
Reviewed-by: NZhang Jianhua <chris.zjh@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
上级 351076ee
......@@ -58,12 +58,16 @@ SYM_FUNC_START_NOALIGN(__x86_indirect_alt_call_\reg)
2: .skip 5-(2b-1b), 0x90
SYM_FUNC_END(__x86_indirect_alt_call_\reg)
STACK_FRAME_NON_STANDARD(__x86_indirect_alt_call_\reg)
SYM_FUNC_START_NOALIGN(__x86_indirect_alt_jmp_\reg)
ANNOTATE_RETPOLINE_SAFE
1: jmp *%\reg
2: .skip 5-(2b-1b), 0x90
SYM_FUNC_END(__x86_indirect_alt_jmp_\reg)
STACK_FRAME_NON_STANDARD(__x86_indirect_alt_jmp_\reg)
.endm
/*
......
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