On Thu, Sep 09, 2021 at 11:49:55AM +0800, kernel test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > head: 999569d59a0aa2509ae4a67ecc266c1134e37e7b > commit: f5b1a5d922d3199e0637349239b43aed6c7656b9 [12105/12116] mm/vmalloc: add __alloc_size attributes for better bounds checking > config: i386-randconfig-a002-20200329 (attached as .config) > compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 > reproduce (this is a W=1 build): > # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=f5b1a5d922d3199e0637349239b43aed6c7656b9 > git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git > git fetch --no-tags linux-next master > git checkout f5b1a5d922d3199e0637349239b43aed6c7656b9 > # save the attached .config to linux build tree > mkdir build_dir > make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/rapidio/devices/ > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <lkp@xxxxxxxxx> > > All errors (new ones prefixed by >>): > > In file included from arch/x86/include/asm/preempt.h:7, > from include/linux/preempt.h:78, > from include/linux/spinlock.h:55, > from include/linux/mm_types.h:9, > from include/linux/buildid.h:5, > from include/linux/module.h:14, > from drivers/rapidio/devices/rio_mport_cdev.c:13: > In function 'check_copy_size', > inlined from 'copy_from_user' at include/linux/uaccess.h:191:6, > inlined from 'rio_mport_transfer_ioctl' at drivers/rapidio/devices/rio_mport_cdev.c:983:6: > >> include/linux/thread_info.h:213:4: error: call to '__bad_copy_to' declared with attribute error: copy destination size is too small > 213 | __bad_copy_to(); > | ^~~~~~~~~~~~~~~ transfer = vmalloc(array_size(sizeof(*transfer), transaction.count)); if (!transfer) return -ENOMEM; if (unlikely(copy_from_user(transfer, (void __user *)(uintptr_t)transaction.block, array_size(sizeof(*transfer), transaction.count)))) { Uhhhmm... allocation size and copy size are identical... array_size(sizeof(*transfer), transaction.count) array_size(sizeof(*transfer), transaction.count) -- Kees Cook
