From: Peter Zijlstra <peterz@xxxxxxxxxxxxx> [ 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@xxxxxxxxxxxxxx> Reported-by: Marco Elver <elver@xxxxxxxxxx> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Reviewed-by: Lai Jiangshan <jiangshanlai@xxxxxxxxx> Tested-by: Marco Elver <elver@xxxxxxxxxx> Link: https://lkml.kernel.org/r/20200618144801.819246178@xxxxxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- 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
