linux-kernel - [PATCH AUTOSEL 4.14 16/17] x86/entry: Increase entry

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Date:   Wed,  1 Jul 2020 21:26:48 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...capital.net>,
        Marco Elver <elver@...gle.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.14 16/17] x86/entry: Increase entry_stack size to a full page

From: Peter Zijlstra <peterz@...radead.org>

[ Upstream commit c7aadc09321d8f9a1d3bd1e6d8a47222ecddf6c5 ]

Marco crashed in bad_iret with a Clang11/KCSAN build due to
overflowing the stack. Now that we run C code on it, expand it to a
full page.

Suggested-by: Andy Lutomirski <luto@...capital.net>
Reported-by: Marco Elver <elver@...gle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Lai Jiangshan <jiangshanlai@...il.com>
Tested-by: Marco Elver <elver@...gle.com>
Link: https://lkml.kernel.org/r/20200618144801.819246178@infradead.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/x86/include/asm/processor.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 6a87eda9691e4..56a89519dc144 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -344,7 +344,7 @@ struct x86_hw_tss {
 #define INVALID_IO_BITMAP_OFFSET	0x8000
 
 struct entry_stack {
-	unsigned long		words[64];
+	char	stack[PAGE_SIZE];
 };
 
 struct entry_stack_page {
-- 
2.25.1