On Mon, Feb 08, 2021 at 03:21:53PM -0600, Josh Poimboeuf wrote: > > fs/select.o: warning: objtool: do_sys_poll()+0x8e9: call to __ubsan_handle_sub_overflow() with UACCESS enabled > > lib/iov_iter.o: warning: objtool: iovec_from_user.part.12()+0x2db: call to __ubsan_handle_add_overflow() with UACCESS enabled > > Peter, we need the patch to prevent UBSAN with gcc7? I send it a while ago, Andrey wasn't liking it or something :/ But yes, UBSAN on <GCC8 is buggered. Randy ought to be aware of that though. Maybe he wanted something like the below? > > vmlinux.o: warning: objtool: do_machine_check()+0x7ee: call to queue_task_work() leaves .noinstr.text section > > vmlinux.o: warning: objtool: lock_is_held_type()+0x107: call to warn_bogus_irq_restore() leaves .noinstr.text section > > Peter? The mce one is a rats nest, Boris has that on his todo list. I'll go look at the lockdep one. --- lib/Kconfig.ubsan | 1 + 1 file changed, 1 insertion(+) diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan index 3a0b1c930733..6e4634b3b40e 100644 --- a/lib/Kconfig.ubsan +++ b/lib/Kconfig.ubsan @@ -116,6 +116,7 @@ config UBSAN_SIGNED_OVERFLOW bool "Perform checking for signed arithmetic overflow" default UBSAN depends on $(cc-option,-fsanitize=signed-integer-overflow) + depends on !CC_IS_GCC || GCC_VERSION >= 80000 help This option enables -fsanitize=signed-integer-overflow which checks for overflow of any arithmetic operations with signed integers.
