Re: [PATCH v1 RFC Zisslpcfi 08/20] riscv: ELF header parsing in GNU property for riscv zisslpcfi

[kernel test robot <lkp@intel.com>]

Hi Deepak,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on kees/for-next/execve]
[also build test WARNING on linus/master arnd-asm-generic/master v6.2-rc8]
[cannot apply to next-20230213]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Deepak-Gupta/sslp-stubs-shadow-stack-and-landing-pad-stubs/20230213-125630
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/execve
patch link:    https://lore.kernel.org/r/20230213045351.3945824-9-debug%40rivosinc.com
patch subject: [PATCH v1 RFC Zisslpcfi 08/20] riscv: ELF header parsing in GNU property for riscv zisslpcfi
config: riscv-allmodconfig (https://download.01.org/0day-ci/archive/20230214/202302140228.ognw1SO3-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/20f9ba1925526ea13ae4ba4398b2c4a800e63c53
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Deepak-Gupta/sslp-stubs-shadow-stack-and-landing-pad-stubs/20230213-125630
        git checkout 20f9ba1925526ea13ae4ba4398b2c4a800e63c53
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=riscv olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kernel/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202302140228.ognw1SO3-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/riscv/kernel/process.c:203:5: warning: no previous prototype for 'allocate_shadow_stack' [-Wmissing-prototypes]
     203 | int allocate_shadow_stack(unsigned long *shadow_stack_base, unsigned long *shdw_size)
         |     ^~~~~~~~~~~~~~~~~~~~~


vim +/allocate_shadow_stack +203 arch/riscv/kernel/process.c

   201	
   202	
 > 203	int allocate_shadow_stack(unsigned long *shadow_stack_base, unsigned long *shdw_size)
   204	{
   205		int flags = MAP_ANONYMOUS | MAP_PRIVATE;
   206		struct mm_struct *mm = current->mm;
   207		unsigned long addr, populate, size;
   208		*shadow_stack = 0;
   209	
   210		if (!shdw_size)
   211			return -EINVAL;
   212	
   213		size = *shdw_size;
   214	
   215		/* If size is 0, then try to calculate yourself */
   216		if (size == 0)
   217			size = round_up(min_t(unsigned long long, rlimit(RLIMIT_STACK), SZ_4G), PAGE_SIZE);
   218		mmap_write_lock(mm);
   219		addr = do_mmap(NULL, 0, size, PROT_SHADOWSTACK, flags, 0,
   220			       &populate, NULL);
   221		mmap_write_unlock(mm);
   222		if (IS_ERR_VALUE(addr))
   223			return PTR_ERR((void *)addr);
   224		*shadow_stack_base = addr;
   225		*shdw_size = size;
   226		return 0;
   227	}
   228	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests