linux-kernel - Re: [PATCH v5 10/10] lkdtm: Add test for XPFO

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Message-ID: <201708130545.e1CG6Ins%fengguang.wu@intel.com>
Date:   Sun, 13 Aug 2017 05:05:23 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Tycho Andersen <tycho@...ker.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, kernel-hardening@...ts.openwall.com,
        Marco Benatto <marco.antonio.780@...il.com>,
        Juerg Haefliger <juerg.haefliger@...onical.com>,
        Juerg Haefliger <juerg.haefliger@....com>,
        Tycho Andersen <tycho@...ker.com>
Subject: Re: [PATCH v5 10/10] lkdtm: Add test for XPFO

Hi Juerg,

[auto build test ERROR on arm64/for-next/core]
[also build test ERROR on v4.13-rc4]
[cannot apply to next-20170811]
[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/Tycho-Andersen/Add-support-for-eXclusive-Page-Frame-Ownership/20170813-035705
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
config: xtensa-allmodconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 4.9.0
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=xtensa 

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

   drivers//misc/lkdtm_xpfo.c: In function 'read_user_with_flags':
   drivers//misc/lkdtm_xpfo.c:31:2: error: implicit declaration of function 'user_virt_to_phys' [-Werror=implicit-function-declaration]
     phys_addr = user_virt_to_phys(user_addr);
     ^
>> drivers//misc/lkdtm_xpfo.c:37:2: error: implicit declaration of function 'phys_to_virt' [-Werror=implicit-function-declaration]
     virt_addr = phys_to_virt(phys_addr);
     ^
>> drivers//misc/lkdtm_xpfo.c:37:12: warning: assignment makes pointer from integer without a cast
     virt_addr = phys_to_virt(phys_addr);
               ^
>> drivers//misc/lkdtm_xpfo.c:38:2: error: implicit declaration of function 'virt_to_phys' [-Werror=implicit-function-declaration]
     if (phys_addr != virt_to_phys(virt_addr)) {
     ^
   cc1: some warnings being treated as errors

vim +/phys_to_virt +37 drivers//misc/lkdtm_xpfo.c

    10	
    11	void read_user_with_flags(unsigned long flags)
    12	{
    13		unsigned long user_addr, user_data = 0xdeadbeef;
    14		phys_addr_t phys_addr;
    15		void *virt_addr;
    16	
    17		user_addr = vm_mmap(NULL, 0, PAGE_SIZE,
    18				    PROT_READ | PROT_WRITE | PROT_EXEC,
    19				    flags, 0);
    20		if (user_addr >= TASK_SIZE) {
    21			pr_warn("Failed to allocate user memory\n");
    22			return;
    23		}
    24	
    25		if (copy_to_user((void __user *)user_addr, &user_data,
    26				 sizeof(user_data))) {
    27			pr_warn("copy_to_user failed\n");
    28			goto free_user;
    29		}
    30	
  > 31		phys_addr = user_virt_to_phys(user_addr);
    32		if (!phys_addr) {
    33			pr_warn("Failed to get physical address of user memory\n");
    34			goto free_user;
    35		}
    36	
  > 37		virt_addr = phys_to_virt(phys_addr);
  > 38		if (phys_addr != virt_to_phys(virt_addr)) {
    39			pr_warn("Physical address of user memory seems incorrect\n");
    40			goto free_user;
    41		}
    42	
    43		pr_info("Attempting bad read from kernel address %p\n", virt_addr);
    44		if (*(unsigned long *)virt_addr == user_data)
    45			pr_info("Huh? Bad read succeeded?!\n");
    46		else
    47			pr_info("Huh? Bad read didn't fail but data is incorrect?!\n");
    48	
    49	 free_user:
    50		vm_munmap(user_addr, PAGE_SIZE);
    51	}
    52	

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