Re: [PATCH v6 6/7] Reimplement RLIMIT_MEMLOCK on top of ucounts

[kernel test robot <lkp@intel.com>]

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Hi Alexey,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on kselftest/next]
[also build test ERROR on linux/master linus/master v5.11 next-20210212]
[cannot apply to hnaz-linux-mm/master]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Alexey-Gladkov/Count-rlimits-in-each-user-namespace/20210215-204524
base:   https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git next
config: xtensa-common_defconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 9.3.0
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
        # https://github.com/0day-ci/linux/commit/f009495a8def89a71b9e0b9025a39379d6f9097d
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Alexey-Gladkov/Count-rlimits-in-each-user-namespace/20210215-204524
        git checkout f009495a8def89a71b9e0b9025a39379d6f9097d
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=xtensa 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   ipc/shm.c: In function 'newseg':
>> ipc/shm.c:653:5: error: passing argument 4 of 'hugetlb_file_setup' from incompatible pointer type [-Werror=incompatible-pointer-types]
     653 |     &shp->mlock_cred, HUGETLB_SHMFS_INODE,
         |     ^~~~~~~~~~~~~~~~
         |     |
         |     const struct cred **
   In file included from ipc/shm.c:30:
   include/linux/hugetlb.h:457:17: note: expected 'struct cred **' but argument is of type 'const struct cred **'
     457 |   struct cred **cred, int creat_flags,
         |   ~~~~~~~~~~~~~~^~~~
   cc1: some warnings being treated as errors


vim +/hugetlb_file_setup +653 ipc/shm.c

   592	
   593	/**
   594	 * newseg - Create a new shared memory segment
   595	 * @ns: namespace
   596	 * @params: ptr to the structure that contains key, size and shmflg
   597	 *
   598	 * Called with shm_ids.rwsem held as a writer.
   599	 */
   600	static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
   601	{
   602		key_t key = params->key;
   603		int shmflg = params->flg;
   604		size_t size = params->u.size;
   605		int error;
   606		struct shmid_kernel *shp;
   607		size_t numpages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
   608		struct file *file;
   609		char name[13];
   610		vm_flags_t acctflag = 0;
   611	
   612		if (size < SHMMIN || size > ns->shm_ctlmax)
   613			return -EINVAL;
   614	
   615		if (numpages << PAGE_SHIFT < size)
   616			return -ENOSPC;
   617	
   618		if (ns->shm_tot + numpages < ns->shm_tot ||
   619				ns->shm_tot + numpages > ns->shm_ctlall)
   620			return -ENOSPC;
   621	
   622		shp = kvmalloc(sizeof(*shp), GFP_KERNEL);
   623		if (unlikely(!shp))
   624			return -ENOMEM;
   625	
   626		shp->shm_perm.key = key;
   627		shp->shm_perm.mode = (shmflg & S_IRWXUGO);
   628		shp->mlock_cred = NULL;
   629	
   630		shp->shm_perm.security = NULL;
   631		error = security_shm_alloc(&shp->shm_perm);
   632		if (error) {
   633			kvfree(shp);
   634			return error;
   635		}
   636	
   637		sprintf(name, "SYSV%08x", key);
   638		if (shmflg & SHM_HUGETLB) {
   639			struct hstate *hs;
   640			size_t hugesize;
   641	
   642			hs = hstate_sizelog((shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK);
   643			if (!hs) {
   644				error = -EINVAL;
   645				goto no_file;
   646			}
   647			hugesize = ALIGN(size, huge_page_size(hs));
   648	
   649			/* hugetlb_file_setup applies strict accounting */
   650			if (shmflg & SHM_NORESERVE)
   651				acctflag = VM_NORESERVE;
   652			file = hugetlb_file_setup(name, hugesize, acctflag,
 > 653					&shp->mlock_cred, HUGETLB_SHMFS_INODE,
   654					(shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK);
   655		} else {
   656			/*
   657			 * Do not allow no accounting for OVERCOMMIT_NEVER, even
   658			 * if it's asked for.
   659			 */
   660			if  ((shmflg & SHM_NORESERVE) &&
   661					sysctl_overcommit_memory != OVERCOMMIT_NEVER)
   662				acctflag = VM_NORESERVE;
   663			file = shmem_kernel_file_setup(name, size, acctflag);
   664		}
   665		error = PTR_ERR(file);
   666		if (IS_ERR(file)) {
   667			shp->mlock_cred = NULL;
   668			goto no_file;
   669		}
   670	
   671		shp->shm_cprid = get_pid(task_tgid(current));
   672		shp->shm_lprid = NULL;
   673		shp->shm_atim = shp->shm_dtim = 0;
   674		shp->shm_ctim = ktime_get_real_seconds();
   675		shp->shm_segsz = size;
   676		shp->shm_nattch = 0;
   677		shp->shm_file = file;
   678		shp->shm_creator = current;
   679	
   680		/* ipc_addid() locks shp upon success. */
   681		error = ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni);
   682		if (error < 0)
   683			goto no_id;
   684	
   685		list_add(&shp->shm_clist, &current->sysvshm.shm_clist);
   686	
   687		/*
   688		 * shmid gets reported as "inode#" in /proc/pid/maps.
   689		 * proc-ps tools use this. Changing this will break them.
   690		 */
   691		file_inode(file)->i_ino = shp->shm_perm.id;
   692	
   693		ns->shm_tot += numpages;
   694		error = shp->shm_perm.id;
   695	
   696		ipc_unlock_object(&shp->shm_perm);
   697		rcu_read_unlock();
   698		return error;
   699	
   700	no_id:
   701		ipc_update_pid(&shp->shm_cprid, NULL);
   702		ipc_update_pid(&shp->shm_lprid, NULL);
   703		if (is_file_hugepages(file) && shp->mlock_cred)
   704			user_shm_unlock(size, shp->mlock_cred);
   705		fput(file);
   706		ipc_rcu_putref(&shp->shm_perm, shm_rcu_free);
   707		return error;
   708	no_file:
   709		call_rcu(&shp->shm_perm.rcu, shm_rcu_free);
   710		return error;
   711	}
   712	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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