Re: [PATCH] Staging : android: Struct file_operations should be const
From: kernel test robot
Date: Mon Feb 07 2022 - 03:33:44 EST
Hi Leonardo,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on staging/staging-testing]
[also build test ERROR on linux/master linus/master v5.17-rc3 next-20220204]
[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/Leonardo-Araujo/Staging-android-Struct-file_operations-should-be-const/20220207-140301
base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git 74e69e95f13f91c57c9322c7754a85a0e13e9b90
config: s390-randconfig-r044-20220207 (https://download.01.org/0day-ci/archive/20220207/202202071653.db3wZIpH-lkp@xxxxxxxxx/config)
compiler: s390-linux-gcc (GCC) 11.2.0
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/64cb13193a6a834c5cc3118068cf0ea5670bae8d
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Leonardo-Araujo/Staging-android-Struct-file_operations-should-be-const/20220207-140301
git checkout 64cb13193a6a834c5cc3118068cf0ea5670bae8d
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=s390 SHELL=/bin/bash drivers/staging/android/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
All errors (new ones prefixed by >>):
drivers/staging/android/ashmem.c: In function 'ashmem_mmap':
>> drivers/staging/android/ashmem.c:431:37: error: assignment of read-only variable 'vmfile_fops'
431 | vmfile_fops = *vmfile->f_op;
| ^
>> drivers/staging/android/ashmem.c:432:42: error: assignment of member 'mmap' in read-only object
432 | vmfile_fops.mmap = ashmem_vmfile_mmap;
| ^
>> drivers/staging/android/ashmem.c:433:55: error: assignment of member 'get_unmapped_area' in read-only object
433 | vmfile_fops.get_unmapped_area =
| ^
vim +/vmfile_fops +431 drivers/staging/android/ashmem.c
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 377
11980c2ac4ccfa Robert Love 2011-12-20 378 static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
11980c2ac4ccfa Robert Love 2011-12-20 379 {
64cb13193a6a83 Leonardo Araujo 2022-02-07 380 static const struct file_operations vmfile_fops;
11980c2ac4ccfa Robert Love 2011-12-20 381 struct ashmem_area *asma = file->private_data;
11980c2ac4ccfa Robert Love 2011-12-20 382 int ret = 0;
11980c2ac4ccfa Robert Love 2011-12-20 383
11980c2ac4ccfa Robert Love 2011-12-20 384 mutex_lock(&ashmem_mutex);
11980c2ac4ccfa Robert Love 2011-12-20 385
11980c2ac4ccfa Robert Love 2011-12-20 386 /* user needs to SET_SIZE before mapping */
59848d6aded59a Alistair Strachan 2018-06-19 387 if (!asma->size) {
11980c2ac4ccfa Robert Love 2011-12-20 388 ret = -EINVAL;
11980c2ac4ccfa Robert Love 2011-12-20 389 goto out;
11980c2ac4ccfa Robert Love 2011-12-20 390 }
11980c2ac4ccfa Robert Love 2011-12-20 391
8632c614565d0c Alistair Strachan 2018-06-19 392 /* requested mapping size larger than object size */
8632c614565d0c Alistair Strachan 2018-06-19 393 if (vma->vm_end - vma->vm_start > PAGE_ALIGN(asma->size)) {
11980c2ac4ccfa Robert Love 2011-12-20 394 ret = -EINVAL;
11980c2ac4ccfa Robert Love 2011-12-20 395 goto out;
11980c2ac4ccfa Robert Love 2011-12-20 396 }
11980c2ac4ccfa Robert Love 2011-12-20 397
11980c2ac4ccfa Robert Love 2011-12-20 398 /* requested protection bits must match our allowed protection mask */
59848d6aded59a Alistair Strachan 2018-06-19 399 if ((vma->vm_flags & ~calc_vm_prot_bits(asma->prot_mask, 0)) &
59848d6aded59a Alistair Strachan 2018-06-19 400 calc_vm_prot_bits(PROT_MASK, 0)) {
11980c2ac4ccfa Robert Love 2011-12-20 401 ret = -EPERM;
11980c2ac4ccfa Robert Love 2011-12-20 402 goto out;
11980c2ac4ccfa Robert Love 2011-12-20 403 }
56f76fc68492af Arve Hjønnevåg 2011-12-20 404 vma->vm_flags &= ~calc_vm_may_flags(~asma->prot_mask);
11980c2ac4ccfa Robert Love 2011-12-20 405
11980c2ac4ccfa Robert Love 2011-12-20 406 if (!asma->file) {
11980c2ac4ccfa Robert Love 2011-12-20 407 char *name = ASHMEM_NAME_DEF;
11980c2ac4ccfa Robert Love 2011-12-20 408 struct file *vmfile;
3e338d3c95c735 Suren Baghdasaryan 2020-07-30 409 struct inode *inode;
11980c2ac4ccfa Robert Love 2011-12-20 410
11980c2ac4ccfa Robert Love 2011-12-20 411 if (asma->name[ASHMEM_NAME_PREFIX_LEN] != '\0')
11980c2ac4ccfa Robert Love 2011-12-20 412 name = asma->name;
11980c2ac4ccfa Robert Love 2011-12-20 413
11980c2ac4ccfa Robert Love 2011-12-20 414 /* ... and allocate the backing shmem file */
11980c2ac4ccfa Robert Love 2011-12-20 415 vmfile = shmem_file_setup(name, asma->size, vma->vm_flags);
7f44cb0ba88b40 Viresh Kumar 2015-07-31 416 if (IS_ERR(vmfile)) {
11980c2ac4ccfa Robert Love 2011-12-20 417 ret = PTR_ERR(vmfile);
11980c2ac4ccfa Robert Love 2011-12-20 418 goto out;
11980c2ac4ccfa Robert Love 2011-12-20 419 }
97fbfef6bd5978 Shuxiao Zhang 2017-04-06 420 vmfile->f_mode |= FMODE_LSEEK;
3e338d3c95c735 Suren Baghdasaryan 2020-07-30 421 inode = file_inode(vmfile);
3e338d3c95c735 Suren Baghdasaryan 2020-07-30 422 lockdep_set_class(&inode->i_rwsem, &backing_shmem_inode_class);
11980c2ac4ccfa Robert Love 2011-12-20 423 asma->file = vmfile;
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 424 /*
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 425 * override mmap operation of the vmfile so that it can't be
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 426 * remapped which would lead to creation of a new vma with no
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 427 * asma permission checks. Have to override get_unmapped_area
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 428 * as well to prevent VM_BUG_ON check for f_ops modification.
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 429 */
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 430 if (!vmfile_fops.mmap) {
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 @431 vmfile_fops = *vmfile->f_op;
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 @432 vmfile_fops.mmap = ashmem_vmfile_mmap;
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 @433 vmfile_fops.get_unmapped_area =
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 434 ashmem_vmfile_get_unmapped_area;
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 435 }
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 436 vmfile->f_op = &vmfile_fops;
11980c2ac4ccfa Robert Love 2011-12-20 437 }
11980c2ac4ccfa Robert Love 2011-12-20 438 get_file(asma->file);
11980c2ac4ccfa Robert Love 2011-12-20 439
11980c2ac4ccfa Robert Love 2011-12-20 440 /*
11980c2ac4ccfa Robert Love 2011-12-20 441 * XXX - Reworked to use shmem_zero_setup() instead of
11980c2ac4ccfa Robert Love 2011-12-20 442 * shmem_set_file while we're in staging. -jstultz
11980c2ac4ccfa Robert Love 2011-12-20 443 */
11980c2ac4ccfa Robert Love 2011-12-20 444 if (vma->vm_flags & VM_SHARED) {
11980c2ac4ccfa Robert Love 2011-12-20 445 ret = shmem_zero_setup(vma);
11980c2ac4ccfa Robert Love 2011-12-20 446 if (ret) {
11980c2ac4ccfa Robert Love 2011-12-20 447 fput(asma->file);
11980c2ac4ccfa Robert Love 2011-12-20 448 goto out;
11980c2ac4ccfa Robert Love 2011-12-20 449 }
44960f2a7b63e2 John Stultz 2018-07-31 450 } else {
44960f2a7b63e2 John Stultz 2018-07-31 451 vma_set_anonymous(vma);
11980c2ac4ccfa Robert Love 2011-12-20 452 }
11980c2ac4ccfa Robert Love 2011-12-20 453
295992fb815e79 Christian König 2020-09-14 454 vma_set_file(vma, asma->file);
295992fb815e79 Christian König 2020-09-14 455 /* XXX: merge this with the get_file() above if possible */
295992fb815e79 Christian König 2020-09-14 456 fput(asma->file);
11980c2ac4ccfa Robert Love 2011-12-20 457
11980c2ac4ccfa Robert Love 2011-12-20 458 out:
11980c2ac4ccfa Robert Love 2011-12-20 459 mutex_unlock(&ashmem_mutex);
11980c2ac4ccfa Robert Love 2011-12-20 460 return ret;
11980c2ac4ccfa Robert Love 2011-12-20 461 }
11980c2ac4ccfa Robert Love 2011-12-20 462
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