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Date:   Sun, 14 Jun 2020 04:22:39 +0800
From:   kernel test robot <lkp@...el.com>
To:     Dio Putra <dioput12@...il.com>, gregkh@...uxfoundation.org
Cc:     kbuild-all@...ts.01.org, arve@...roid.com, tkjos@...roid.com,
        maco@...roid.com, joel@...lfernandes.org, christian@...uner.io,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: android: ashmem.c: Cleanup

Hi Dio,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on staging/staging-testing]
[cannot apply to aa5af974127d317071d6225a0f3678c5f520e7ce]

url:    https://github.com/0day-ci/linux/commits/Dio-Putra/staging-android-ashmem-c-Cleanup/20200614-013821
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git af7b4801030c07637840191c69eb666917e4135d
config: powerpc-randconfig-r016-20200614 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project c669a1ed6386d57a75a602b53266466dae1e1d84)
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
        # install powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc 

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

All errors (new ones prefixed by >>, old ones prefixed by <<):

^
arch/powerpc/include/asm/io.h:543:56: note: expanded from macro '__do_insw'
#define __do_insw(p, b, n)      readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from drivers/staging/android/ashmem.c:26:
In file included from include/linux/shmem_fs.h:6:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:26:
In file included from include/linux/kernel_stat.h:9:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:605:
arch/powerpc/include/asm/io-defs.h:47:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:602:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al;                                                    ^~~~~~~~~~~~~~
<scratch space>:118:1: note: expanded from here
__do_insl
^
arch/powerpc/include/asm/io.h:544:56: note: expanded from macro '__do_insl'
#define __do_insl(p, b, n)      readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from drivers/staging/android/ashmem.c:26:
In file included from include/linux/shmem_fs.h:6:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:26:
In file included from include/linux/kernel_stat.h:9:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:605:
arch/powerpc/include/asm/io-defs.h:49:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:602:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al;                                                    ^~~~~~~~~~~~~~
<scratch space>:120:1: note: expanded from here
__do_outsb
^
arch/powerpc/include/asm/io.h:545:58: note: expanded from macro '__do_outsb'
#define __do_outsb(p, b, n)     writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from drivers/staging/android/ashmem.c:26:
In file included from include/linux/shmem_fs.h:6:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:26:
In file included from include/linux/kernel_stat.h:9:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:605:
arch/powerpc/include/asm/io-defs.h:51:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:602:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al;                                                    ^~~~~~~~~~~~~~
<scratch space>:122:1: note: expanded from here
__do_outsw
^
arch/powerpc/include/asm/io.h:546:58: note: expanded from macro '__do_outsw'
#define __do_outsw(p, b, n)     writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from drivers/staging/android/ashmem.c:26:
In file included from include/linux/shmem_fs.h:6:
In file included from include/linux/swap.h:9:
In file included from include/linux/memcontrol.h:13:
In file included from include/linux/cgroup.h:26:
In file included from include/linux/kernel_stat.h:9:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:605:
arch/powerpc/include/asm/io-defs.h:53:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:602:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al;                                                    ^~~~~~~~~~~~~~
<scratch space>:124:1: note: expanded from here
__do_outsl
^
arch/powerpc/include/asm/io.h:547:58: note: expanded from macro '__do_outsl'
#define __do_outsl(p, b, n)     writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
~~~~~~~~~~~~~~~~~~~~~^
>> drivers/staging/android/ashmem.c:418:16: error: cannot assign to variable 'vmfile_fops' with const-qualified type 'const struct file_operations'
vmfile_fops = *vmfile->f_op;
~~~~~~~~~~~ ^
drivers/staging/android/ashmem.c:370:38: note: variable 'vmfile_fops' declared const here
static const struct file_operations vmfile_fops;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
drivers/staging/android/ashmem.c:419:21: error: cannot assign to variable 'vmfile_fops' with const-qualified type 'const struct file_operations'
vmfile_fops.mmap = ashmem_vmfile_mmap;
~~~~~~~~~~~~~~~~ ^
drivers/staging/android/ashmem.c:370:38: note: variable 'vmfile_fops' declared const here
static const struct file_operations vmfile_fops;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
drivers/staging/android/ashmem.c:420:34: error: cannot assign to variable 'vmfile_fops' with const-qualified type 'const struct file_operations'
vmfile_fops.get_unmapped_area =
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
drivers/staging/android/ashmem.c:370:38: note: variable 'vmfile_fops' declared const here
static const struct file_operations vmfile_fops;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
6 warnings and 3 errors generated.

vim +418 drivers/staging/android/ashmem.c

6d67b0290b4b84 Suren Baghdasaryan 2020-01-27  367  
11980c2ac4ccfa Robert Love        2011-12-20  368  static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
11980c2ac4ccfa Robert Love        2011-12-20  369  {
7fe32ab69ec805 Dio Putra          2020-06-14  370  	static const struct file_operations vmfile_fops;
11980c2ac4ccfa Robert Love        2011-12-20  371  	struct ashmem_area *asma = file->private_data;
11980c2ac4ccfa Robert Love        2011-12-20  372  	int ret = 0;
11980c2ac4ccfa Robert Love        2011-12-20  373  
11980c2ac4ccfa Robert Love        2011-12-20  374  	mutex_lock(&ashmem_mutex);
11980c2ac4ccfa Robert Love        2011-12-20  375  
11980c2ac4ccfa Robert Love        2011-12-20  376  	/* user needs to SET_SIZE before mapping */
59848d6aded59a Alistair Strachan  2018-06-19  377  	if (!asma->size) {
11980c2ac4ccfa Robert Love        2011-12-20  378  		ret = -EINVAL;
11980c2ac4ccfa Robert Love        2011-12-20  379  		goto out;
11980c2ac4ccfa Robert Love        2011-12-20  380  	}
11980c2ac4ccfa Robert Love        2011-12-20  381  
8632c614565d0c Alistair Strachan  2018-06-19  382  	/* requested mapping size larger than object size */
8632c614565d0c Alistair Strachan  2018-06-19  383  	if (vma->vm_end - vma->vm_start > PAGE_ALIGN(asma->size)) {
11980c2ac4ccfa Robert Love        2011-12-20  384  		ret = -EINVAL;
11980c2ac4ccfa Robert Love        2011-12-20  385  		goto out;
11980c2ac4ccfa Robert Love        2011-12-20  386  	}
11980c2ac4ccfa Robert Love        2011-12-20  387  
11980c2ac4ccfa Robert Love        2011-12-20  388  	/* requested protection bits must match our allowed protection mask */
59848d6aded59a Alistair Strachan  2018-06-19  389  	if ((vma->vm_flags & ~calc_vm_prot_bits(asma->prot_mask, 0)) &
59848d6aded59a Alistair Strachan  2018-06-19  390  	    calc_vm_prot_bits(PROT_MASK, 0)) {
11980c2ac4ccfa Robert Love        2011-12-20  391  		ret = -EPERM;
11980c2ac4ccfa Robert Love        2011-12-20  392  		goto out;
11980c2ac4ccfa Robert Love        2011-12-20  393  	}
56f76fc68492af Arve Hjønnevåg     2011-12-20  394  	vma->vm_flags &= ~calc_vm_may_flags(~asma->prot_mask);
11980c2ac4ccfa Robert Love        2011-12-20  395  
11980c2ac4ccfa Robert Love        2011-12-20  396  	if (!asma->file) {
11980c2ac4ccfa Robert Love        2011-12-20  397  		char *name = ASHMEM_NAME_DEF;
11980c2ac4ccfa Robert Love        2011-12-20  398  		struct file *vmfile;
11980c2ac4ccfa Robert Love        2011-12-20  399  
11980c2ac4ccfa Robert Love        2011-12-20  400  		if (asma->name[ASHMEM_NAME_PREFIX_LEN] != '\0')
11980c2ac4ccfa Robert Love        2011-12-20  401  			name = asma->name;
11980c2ac4ccfa Robert Love        2011-12-20  402  
11980c2ac4ccfa Robert Love        2011-12-20  403  		/* ... and allocate the backing shmem file */
11980c2ac4ccfa Robert Love        2011-12-20  404  		vmfile = shmem_file_setup(name, asma->size, vma->vm_flags);
7f44cb0ba88b40 Viresh Kumar       2015-07-31  405  		if (IS_ERR(vmfile)) {
11980c2ac4ccfa Robert Love        2011-12-20  406  			ret = PTR_ERR(vmfile);
11980c2ac4ccfa Robert Love        2011-12-20  407  			goto out;
11980c2ac4ccfa Robert Love        2011-12-20  408  		}
97fbfef6bd5978 Shuxiao Zhang      2017-04-06  409  		vmfile->f_mode |= FMODE_LSEEK;
11980c2ac4ccfa Robert Love        2011-12-20  410  		asma->file = vmfile;
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27  411  		/*
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27  412  		 * override mmap operation of the vmfile so that it can't be
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27  413  		 * remapped which would lead to creation of a new vma with no
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27  414  		 * asma permission checks. Have to override get_unmapped_area
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27  415  		 * as well to prevent VM_BUG_ON check for f_ops modification.
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27  416  		 */
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27  417  		if (!vmfile_fops.mmap) {
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27 @418  			vmfile_fops = *vmfile->f_op;
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27  419  			vmfile_fops.mmap = ashmem_vmfile_mmap;
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27  420  			vmfile_fops.get_unmapped_area =
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27  421  					ashmem_vmfile_get_unmapped_area;
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27  422  		}
6d67b0290b4b84 Suren Baghdasaryan 2020-01-27  423  		vmfile->f_op = &vmfile_fops;
11980c2ac4ccfa Robert Love        2011-12-20  424  	}
11980c2ac4ccfa Robert Love        2011-12-20  425  	get_file(asma->file);
11980c2ac4ccfa Robert Love        2011-12-20  426  
11980c2ac4ccfa Robert Love        2011-12-20  427  	/*
11980c2ac4ccfa Robert Love        2011-12-20  428  	 * XXX - Reworked to use shmem_zero_setup() instead of
11980c2ac4ccfa Robert Love        2011-12-20  429  	 * shmem_set_file while we're in staging. -jstultz
11980c2ac4ccfa Robert Love        2011-12-20  430  	 */
11980c2ac4ccfa Robert Love        2011-12-20  431  	if (vma->vm_flags & VM_SHARED) {
11980c2ac4ccfa Robert Love        2011-12-20  432  		ret = shmem_zero_setup(vma);
11980c2ac4ccfa Robert Love        2011-12-20  433  		if (ret) {
11980c2ac4ccfa Robert Love        2011-12-20  434  			fput(asma->file);
11980c2ac4ccfa Robert Love        2011-12-20  435  			goto out;
11980c2ac4ccfa Robert Love        2011-12-20  436  		}
44960f2a7b63e2 John Stultz        2018-07-31  437  	} else {
44960f2a7b63e2 John Stultz        2018-07-31  438  		vma_set_anonymous(vma);
11980c2ac4ccfa Robert Love        2011-12-20  439  	}
11980c2ac4ccfa Robert Love        2011-12-20  440  
11980c2ac4ccfa Robert Love        2011-12-20  441  	if (vma->vm_file)
11980c2ac4ccfa Robert Love        2011-12-20  442  		fput(vma->vm_file);
11980c2ac4ccfa Robert Love        2011-12-20  443  	vma->vm_file = asma->file;
11980c2ac4ccfa Robert Love        2011-12-20  444  
11980c2ac4ccfa Robert Love        2011-12-20  445  out:
11980c2ac4ccfa Robert Love        2011-12-20  446  	mutex_unlock(&ashmem_mutex);
11980c2ac4ccfa Robert Love        2011-12-20  447  	return ret;
11980c2ac4ccfa Robert Love        2011-12-20  448  }
11980c2ac4ccfa Robert Love        2011-12-20  449  

:::::: The code at line 418 was first introduced by commit
:::::: 6d67b0290b4b84c477e6a2fc6e005e174d3c7786 staging: android: ashmem: Disallow ashmem memory from being remapped

:::::: TO: Suren Baghdasaryan <surenb@...gle.com>
:::::: CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

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