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Date:   Fri, 30 Jun 2023 14:33:57 +0800
From:   kernel test robot <lkp@intel.com>
To:     jeffxu@chromium.org, skhan@linuxfoundation.org,
        keescook@chromium.org
Cc:     llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
        akpm@linux-foundation.org, dmitry.torokhov@gmail.com,
        dverkamp@chromium.org, asmadeus@codewreck.org, hughd@google.com,
        jeffxu@google.com, jorgelo@chromium.org,
        linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
        linux-mm@kvack.org, jannh@google.com,
        linux-hardening@vger.kernel.org,
        linux-security-module@vger.kernel.org
Subject: Re: [PATCH v1 1/2] mm/memfd: sysctl: fix
 MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED
Message-ID: <202306301435.dpXv0GwQ-lkp@intel.com>
References: <20230630031721.623955-2-jeffxu@google.com>
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In-Reply-To: <20230630031721.623955-2-jeffxu@google.com>
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Hi,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/jeffxu-chromium-org/mm-memfd-sysctl-fix-MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED/20230630-111827
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20230630031721.623955-2-jeffxu%40google.com
patch subject: [PATCH v1 1/2] mm/memfd: sysctl: fix MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED
config: hexagon-randconfig-r005-20230630 (https://download.01.org/0day-ci/archive/20230630/202306301435.dpXv0GwQ-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230630/202306301435.dpXv0GwQ-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306301435.dpXv0GwQ-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from mm/memfd.c:12:
   In file included from include/linux/pagemap.h:11:
   In file included from include/linux/highmem.h:12:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:334:
   include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     547 |         val = __raw_readb(PCI_IOBASE + addr);
         |                           ~~~~~~~~~~ ^
   include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     560 |         val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
      37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
         |                                                   ^
   In file included from mm/memfd.c:12:
   In file included from include/linux/pagemap.h:11:
   In file included from include/linux/highmem.h:12:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:334:
   include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     573 |         val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
      35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
         |                                                   ^
   In file included from mm/memfd.c:12:
   In file included from include/linux/pagemap.h:11:
   In file included from include/linux/highmem.h:12:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/hexagon/include/asm/io.h:334:
   include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     584 |         __raw_writeb(value, PCI_IOBASE + addr);
         |                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     594 |         __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     604 |         __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
>> mm/memfd.c:273:15: error: use of undeclared identifier 'MEMFD_NOEXEC_SCOPE_EXEC'
     273 |         int sysctl = MEMFD_NOEXEC_SCOPE_EXEC;
         |                      ^
>> mm/memfd.c:311:17: error: use of undeclared identifier 'MEMFD_NOEXEC_SCOPE_NOEXEC_SEAL'
     311 |                 if (sysctl == MEMFD_NOEXEC_SCOPE_NOEXEC_SEAL)
         |                               ^
>> mm/memfd.c:321:36: error: use of undeclared identifier 'MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED'
     321 |         if (flags & MFD_EXEC && sysctl >= MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED) {
         |                                           ^
   6 warnings and 3 errors generated.


vim +/MEMFD_NOEXEC_SCOPE_EXEC +273 mm/memfd.c

   270	
   271	static int sysctl_memfd_noexec(void)
   272	{
 > 273		int sysctl = MEMFD_NOEXEC_SCOPE_EXEC;
   274	#ifdef CONFIG_SYSCTL
   275		struct pid_namespace *ns;
   276	
   277		ns = task_active_pid_ns(current);
   278		if (ns)
   279			sysctl = ns->memfd_noexec_scope;
   280	#endif
   281		return sysctl;
   282	}
   283	
   284	SYSCALL_DEFINE2(memfd_create,
   285			const char __user *, uname,
   286			unsigned int, flags)
   287	{
   288		char comm[TASK_COMM_LEN];
   289		unsigned int *file_seals;
   290		struct file *file;
   291		int fd, error;
   292		char *name;
   293		long len;
   294		int sysctl = sysctl_memfd_noexec();
   295	
   296		if (!(flags & MFD_HUGETLB)) {
   297			if (flags & ~(unsigned int)MFD_ALL_FLAGS)
   298				return -EINVAL;
   299		} else {
   300			/* Allow huge page size encoding in flags. */
   301			if (flags & ~(unsigned int)(MFD_ALL_FLAGS |
   302					(MFD_HUGE_MASK << MFD_HUGE_SHIFT)))
   303				return -EINVAL;
   304		}
   305	
   306		/* Invalid if both EXEC and NOEXEC_SEAL are set.*/
   307		if ((flags & MFD_EXEC) && (flags & MFD_NOEXEC_SEAL))
   308			return -EINVAL;
   309	
   310		if (!(flags & (MFD_EXEC | MFD_NOEXEC_SEAL))) {
 > 311			if (sysctl == MEMFD_NOEXEC_SCOPE_NOEXEC_SEAL)
   312				flags |= MFD_NOEXEC_SEAL;
   313			else
   314				flags |= MFD_EXEC;
   315	
   316			pr_warn_once(
   317				"memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=%d '%s'\n",
   318				task_pid_nr(current), get_task_comm(comm, current));
   319		}
   320	
 > 321		if (flags & MFD_EXEC && sysctl >= MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED) {

-- 
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https://github.com/intel/lkp-tests/wiki