On 12/17/18 6:03 PM, Anders Roxell wrote: > When booting an allmodconfig kernel, there are a lot of false-positives. > With a message like this 'UBSAN: Undefined behaviour in...' with a call > trace that follows. > > Reworked so that when building a allmodconfig kernel that turns > everything into '=m' or '=y' will turn off UBSAN_ALIGNMENT. > > Suggested-by: Arnd Bergmann <[email protected]> > Signed-off-by: Anders Roxell <[email protected]> > --- Acked-by: Andrey Ryabinin <[email protected]> > lib/Kconfig.ubsan | 14 +++++++++----- > 1 file changed, 9 insertions(+), 5 deletions(-) > > diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan > index 98fa559ebd80..a2ae4a8e4fa6 100644 > --- a/lib/Kconfig.ubsan > +++ b/lib/Kconfig.ubsan > @@ -27,15 +27,19 @@ config UBSAN_SANITIZE_ALL > Enabling this option will get kernel image size increased > significantly. > > -config UBSAN_ALIGNMENT > - bool "Enable checking of pointers alignment" > +config UBSAN_NO_ALIGNMENT > + bool "Disable checking of pointers alignment" > depends on UBSAN > - default y if !HAVE_EFFICIENT_UNALIGNED_ACCESS > + default y if HAVE_EFFICIENT_UNALIGNED_ACCESS > help > - This option enables detection of unaligned memory accesses. > - Enabling this option on architectures that support unaligned > + This option disables the check of unaligned memory accesses. > + This option should be used when building allmodconfig. > + Disabling this option on architectures that support unaligned > accesses may produce a lot of false positives. > > +config UBSAN_ALIGNMENT > + def_bool !UBSAN_NO_ALIGNMENT > + > config TEST_UBSAN > tristate "Module for testing for undefined behavior detection" > depends on m && UBSAN >
