From: Peter Zijlstra peterz@infradead.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@amacapital.net Reported-by: Marco Elver elver@google.com Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Reviewed-by: Lai Jiangshan jiangshanlai@gmail.com Tested-by: Marco Elver elver@google.com Link: https://lkml.kernel.org/r/20200618144801.819246178@infradead.org Signed-off-by: Sasha Levin sashal@kernel.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 54f5d54280f60..a07dfdf7759ec 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -334,7 +334,7 @@ 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 {