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Thu, 17 Feb 2022 04:03:59 +0000 Date: Thu, 17 Feb 2022 12:03:01 +0800 From: kernel test robot To: Kees Cook Cc: llvm@lists.linux.dev, kbuild-all@lists.01.org, linux-kernel@vger.kernel.org Subject: [kees:for-next/lkdtm 3/4] drivers/misc/lkdtm/usercopy.c:74:39: error: use of undeclared identifier 'current_stack_pointer' Message-ID: <202202171116.tFKzkUFI-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org tree: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/lkdtm head: 2223f39d57e495531165ed5bf1d94bf4f1be7963 commit: d89624a74df284274743400bb318dba7246250a4 [3/4] lkdtm/usercopy: Expand size of "out of frame" object config: riscv-randconfig-r004-20220216 (https://download.01.org/0day-ci/archive/20220217/202202171116.tFKzkUFI-lkp@intel.com/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0bad7cb56526f2572c74449fcf97c1fcda42b41d) 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 # install riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?id=d89624a74df284274743400bb318dba7246250a4 git remote add kees https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git git fetch --no-tags kees for-next/lkdtm git checkout d89624a74df284274743400bb318dba7246250a4 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/misc/lkdtm/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All errors (new ones prefixed by >>): >> drivers/misc/lkdtm/usercopy.c:74:39: error: use of undeclared identifier 'current_stack_pointer' pr_info("stack : %px\n", (void *)current_stack_pointer); ^ 1 error generated. vim +/current_stack_pointer +74 drivers/misc/lkdtm/usercopy.c 53 54 static noinline void do_usercopy_stack(bool to_user, bool bad_frame) 55 { 56 unsigned long user_addr; 57 unsigned char good_stack[32]; 58 unsigned char *bad_stack; 59 int i; 60 61 /* Exercise stack to avoid everything living in registers. */ 62 for (i = 0; i < sizeof(good_stack); i++) 63 good_stack[i] = test_text[i % sizeof(test_text)]; 64 65 /* This is a pointer to outside our current stack frame. */ 66 if (bad_frame) { 67 bad_stack = do_usercopy_stack_callee((uintptr_t)&bad_stack); 68 } else { 69 /* Put start address just inside stack. */ 70 bad_stack = task_stack_page(current) + THREAD_SIZE; 71 bad_stack -= sizeof(unsigned long); 72 } 73 > 74 pr_info("stack : %px\n", (void *)current_stack_pointer); 75 pr_info("good_stack: %px-%px\n", good_stack, good_stack + sizeof(good_stack)); 76 pr_info("bad_stack : %px-%px\n", bad_stack, bad_stack + sizeof(good_stack)); 77 78 user_addr = vm_mmap(NULL, 0, PAGE_SIZE, 79 PROT_READ | PROT_WRITE | PROT_EXEC, 80 MAP_ANONYMOUS | MAP_PRIVATE, 0); 81 if (user_addr >= TASK_SIZE) { 82 pr_warn("Failed to allocate user memory\n"); 83 return; 84 } 85 86 if (to_user) { 87 pr_info("attempting good copy_to_user of local stack\n"); 88 if (copy_to_user((void __user *)user_addr, good_stack, 89 unconst + sizeof(good_stack))) { 90 pr_warn("copy_to_user failed unexpectedly?!\n"); 91 goto free_user; 92 } 93 94 pr_info("attempting bad copy_to_user of distant stack\n"); 95 if (copy_to_user((void __user *)user_addr, bad_stack, 96 unconst + sizeof(good_stack))) { 97 pr_warn("copy_to_user failed, but lacked Oops\n"); 98 goto free_user; 99 } 100 } else { 101 /* 102 * There isn't a safe way to not be protected by usercopy 103 * if we're going to write to another thread's stack. 104 */ 105 if (!bad_frame) 106 goto free_user; 107 108 pr_info("attempting good copy_from_user of local stack\n"); 109 if (copy_from_user(good_stack, (void __user *)user_addr, 110 unconst + sizeof(good_stack))) { 111 pr_warn("copy_from_user failed unexpectedly?!\n"); 112 goto free_user; 113 } 114 115 pr_info("attempting bad copy_from_user of distant stack\n"); 116 if (copy_from_user(bad_stack, (void __user *)user_addr, 117 unconst + sizeof(good_stack))) { 118 pr_warn("copy_from_user failed, but lacked Oops\n"); 119 goto free_user; 120 } 121 } 122 123 free_user: 124 vm_munmap(user_addr, PAGE_SIZE); 125 } 126 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org