The following commit has been merged into the x86/entry branch of tip: Commit-ID: c7aadc09321d8f9a1d3bd1e6d8a47222ecddf6c5 Gitweb: https://git.kernel.org/tip/c7aadc09321d8f9a1d3bd1e6d8a47222ecddf6c5 Author: Peter Zijlstra <[email protected]> AuthorDate: Wed, 17 Jun 2020 18:25:57 +02:00 Committer: Peter Zijlstra <[email protected]> CommitterDate: Thu, 25 Jun 2020 13:45:40 +02:00
x86/entry: Increase entry_stack size to a full page 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 <[email protected]> Reported-by: Marco Elver <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Reviewed-by: Lai Jiangshan <[email protected]> Tested-by: Marco Elver <[email protected]> Link: https://lkml.kernel.org/r/[email protected] --- 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 42cd333..03b7c4c 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -370,7 +370,7 @@ struct x86_hw_tss { #define IO_BITMAP_OFFSET_INVALID (__KERNEL_TSS_LIMIT + 1) struct entry_stack { - unsigned long words[64]; + char stack[PAGE_SIZE]; }; struct entry_stack_page {
