Responding to my own message: It turns out that I had somehow botched the installation of the KASAN-ified kernel, so that the module compilation was using old information that didn't include KASAN. Once I got the KASAN-ified kernel properly installed, my module compiled cleanly with KASAN and KASAN did indeed detect memory problems. Sorry for the false alarm. On Tue, Oct 11, 2022 at 9:43 PM John Ousterhout <ouster@xxxxxxxxxxxxxxx> wrote: > > Responding to my own message: > > It turns out that I had somehow botched the installation of the > KASAN-ified kernel, so that the module compilation was using old > information that didn't include KASAN. Once I got the KASAN-ified > kernel properly installed, my module compiled cleanly with KASAN and > KASAN did indeed detect memory problems. > > Sorry for the false alarm. > > > On Tue, Oct 11, 2022 at 2:47 PM John Ousterhout > <john.ousterhout@xxxxxxxxx> wrote: > > > > I'm trying to use the address sanitizer (KASAN) with a loadable module, but so far haven't been able to make it work. I compiled a kernel with KASAN and tested to see that it detects errors properly with kernel files, but when I compile a loadable module with that kernel, the module is not configured for KASAN (e.g. missing CFLAGS switches). Furthermore, I found that the lib/include/config/auto.conf file in the /lib/modules/xxx directory is different from the one in the kernel build directory. I tried copying the auto.conf file from the kernel directory to lib/modules/xxx, but then the module build fails during the link step with missing symbols such as __asan_handle_no_return. > > > > Is KASAN known to work with modules? If so, is any additional configuration needed for a module to use KASAN? > > > > Thanks in advance for any help you can provide. > > > > -John- _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
