linux-kernel - Re: [PATCH v5 4/4] Kselftest for module text allocation benchmarking

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Message-ID: <201809131838.p41CWrms%fengguang.wu@intel.com>
Date:   Thu, 13 Sep 2018 18:36:48 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Rick Edgecombe <rick.p.edgecombe@...el.com>
Cc:     kbuild-all@...org, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com, x86@...nel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, kernel-hardening@...ts.openwall.com,
        daniel@...earbox.net, jannh@...gle.com, keescook@...omium.org,
        alexei.starovoitov@...il.com, kristen@...ux.intel.com,
        dave.hansen@...el.com, arjan@...ux.intel.com,
        Rick Edgecombe <rick.p.edgecombe@...el.com>
Subject: Re: [PATCH v5 4/4] Kselftest for module text allocation benchmarking

Hi Rick,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.19-rc3 next-20180913]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Rick-Edgecombe/KASLR-feature-to-randomize-each-loadable-module/20180913-172302
config: sh-allmodconfig (attached as .config)
compiler: sh4-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.2.0 make.cross ARCH=sh 

All error/warnings (new ones prefixed by >>):

   lib/test_mod_alloc.c: In function 'do_check':
>> lib/test_mod_alloc.c:129:15: error: 'MODULES_VADDR' undeclared (first use in this function); did you mean 'MODULE_SOFTDEP'?
      if (start < MODULES_VADDR ||
                  ^~~~~~~~~~~~~
                  MODULE_SOFTDEP
   lib/test_mod_alloc.c:129:15: note: each undeclared identifier is reported only once for each function it appears in
>> lib/test_mod_alloc.c:130:26: error: 'MODULES_LEN' undeclared (first use in this function); did you mean 'MODULE_ALIGN'?
       end > MODULES_VADDR + MODULES_LEN) {
                             ^~~~~~~~~~~
                             MODULE_ALIGN
   lib/test_mod_alloc.c: In function 'device_file_write':
>> lib/test_mod_alloc.c:404:2: warning: ignoring return value of 'copy_from_user', declared with attribute warn_unused_result [-Wunused-result]
     copy_from_user(buf, user_buf, count);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> lib/test_mod_alloc.c:407:3: warning: ignoring return value of 'kstrtol', declared with attribute warn_unused_result [-Wunused-result]
      kstrtol(buf+1, 10, &new_mod_cnt);
      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   lib/test_mod_alloc.c:422:3: warning: ignoring return value of 'kstrtol', declared with attribute warn_unused_result [-Wunused-result]
      kstrtol(buf + 1, 10, &iter);
      ^~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +129 lib/test_mod_alloc.c

    89	
    90	static int do_check(void *ptr, unsigned long size)
    91	{
    92		int i;
    93		unsigned long start = (unsigned long) ptr;
    94		unsigned long end = calc_end(ptr, size);
    95		unsigned long sum = 0;
    96		unsigned long addr;
    97	
    98		if (!start)
    99			return 1;
   100	
   101		for (i = 0; i < check_alloc_cnt; i++) {
   102			struct check_alloc *cur_alloc = &(check_allocs[i]);
   103	
   104			/* overlap end */
   105			if (start >= cur_alloc->start && start < cur_alloc->vm_end) {
   106				pr_info("overlap end\n");
   107				return 1;
   108			}
   109	
   110			/* overlap start */
   111			if (end >= cur_alloc->start && end < cur_alloc->start) {
   112				pr_info("overlap start\n");
   113				return 1;
   114			}
   115	
   116			/* overlap whole thing */
   117			if (start <= cur_alloc->start && end > cur_alloc->vm_end) {
   118				pr_info("overlap whole thing\n");
   119				return 1;
   120			}
   121	
   122			/* inside */
   123			if (start >= cur_alloc->start && end < cur_alloc->vm_end) {
   124				pr_info("inside\n");
   125				return 1;
   126			}
   127	
   128			/* bounds */
 > 129			if (start < MODULES_VADDR ||
 > 130				end > MODULES_VADDR + MODULES_LEN) {
   131				pr_info("out of bounds\n");
   132				return 1;
   133			}
   134			for (addr = cur_alloc->start;
   135				addr < cur_alloc->real_end;
   136				addr += PAGE_SIZE) {
   137				sum += *((unsigned long *) addr);
   138			}
   139			if (sum != 0)
   140				pr_info("Memory was not zeroed\n");
   141	
   142			kasan_check_read((void *)cur_alloc->start,
   143				cur_alloc->vm_end - cur_alloc->start - PAGE_SIZE);
   144		}
   145		return 0;
   146	}
   147	

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