Re: [PATCH v1 1/2] mm/memfd: sysctl: fix MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED

From: kernel test robot
Date: Fri Jun 30 2023 - 02:34:36 EST

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@xxxxxxxxx/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@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306301435.dpXv0GwQ-lkp@xxxxxxxxx/

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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