On Thu, 30 Sep 2021 15:27:00 -0700 Kees Cook <keescook@xxxxxxxxxxxx> wrote:
> As already done in GrapheneOS, add the __alloc_size attribute for regular
> kmalloc interfaces, to provide additional hinting for better bounds
> checking, assisting CONFIG_FORTIFY_SOURCE and other compiler
> optimizations.
x86_64 allmodconfig:
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/mmzone.h:8,
from ./include/linux/gfp.h:6,
from ./include/linux/mm.h:10,
from ./include/linux/mman.h:5,
from lib/test_kasan_module.c:10:
In function 'check_copy_size',
inlined from 'copy_user_test' at ./include/linux/uaccess.h:191:6:
./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();
| ^~~~~~~~~~~~~~~
In function 'check_copy_size',
inlined from 'copy_user_test' at ./include/linux/uaccess.h:199:6:
./include/linux/thread_info.h:211:4: error: call to '__bad_copy_from' declared with attribute error: copy source size is too small
211 | __bad_copy_from();
| ^~~~~~~~~~~~~~~~~
make[1]: *** [lib/test_kasan_module.o] Error 1
make: *** [lib] Error 2
