tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 7fc7222d9680366edeecc219c21ca96310bdbc10 commit: ec5290a178b787b2f8b21581fdadc919bd004e12 [5435/5912] bpf: Prevent KASAN false positive with bpf_throw config: arc-randconfig-002-20230919 (https://download.01.org/0day-ci/archive/20230919/202309190741.A98l02ua-lkp@xxxxxxxxx/config) compiler: arc-elf-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230919/202309190741.A98l02ua-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202309190741.A98l02ua-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): kernel/bpf/helpers.c: In function 'bpf_throw': >> kernel/bpf/helpers.c:2491:41: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] 2491 | kasan_unpoison_task_stack_below((void *)ctx.sp); | ^ vim +2491 kernel/bpf/helpers.c 2476 2477 __bpf_kfunc void bpf_throw(u64 cookie) 2478 { 2479 struct bpf_throw_ctx ctx = {}; 2480 2481 arch_bpf_stack_walk(bpf_stack_walker, &ctx); 2482 WARN_ON_ONCE(!ctx.aux); 2483 if (ctx.aux) 2484 WARN_ON_ONCE(!ctx.aux->exception_boundary); 2485 WARN_ON_ONCE(!ctx.bp); 2486 WARN_ON_ONCE(!ctx.cnt); 2487 /* Prevent KASAN false positives for CONFIG_KASAN_STACK by unpoisoning 2488 * deeper stack depths than ctx.sp as we do not return from bpf_throw, 2489 * which skips compiler generated instrumentation to do the same. 2490 */ > 2491 kasan_unpoison_task_stack_below((void *)ctx.sp); 2492 ctx.aux->bpf_exception_cb(cookie, ctx.sp, ctx.bp); 2493 } 2494 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
