Re: [PATCH] kernel: Expose SYS_kcmp by default

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Hi Chris,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linux/master]
[also build test ERROR on kees/for-next/seccomp kees/for-next/pstore linus/master v5.11-rc6 next-20210125]
[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/Chris-Wilson/kernel-Expose-SYS_kcmp-by-default/20210206-004006
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2ab38c17aac10bf55ab3efde4c4db3893d8691d2
config: powerpc-randconfig-r023-20210205 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476)
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
        # https://github.com/0day-ci/linux/commit/f7694e48ae81aac5a226e74421dbda1dcdc3ca92
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Chris-Wilson/kernel-Expose-SYS_kcmp-by-default/20210206-004006
        git checkout f7694e48ae81aac5a226e74421dbda1dcdc3ca92
        # 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@xxxxxxxxx>

All error/warnings (new ones prefixed by >>):

   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:619:
   arch/powerpc/include/asm/io-defs.h:45:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
   DEF_PCI_AC_NORET(insw, (unsigned long p, void *b, unsigned long c),
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:190:1: note: expanded from here
   __do_insw
   ^
   arch/powerpc/include/asm/io.h:557:56: 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 kernel/kcmp.c:3:
   In file included from include/linux/syscalls.h:84:
   In file included from include/trace/syscall.h:7:
   In file included from include/linux/trace_events.h:9:
   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:619:
   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:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:192:1: note: expanded from here
   __do_insl
   ^
   arch/powerpc/include/asm/io.h:558:56: 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 kernel/kcmp.c:3:
   In file included from include/linux/syscalls.h:84:
   In file included from include/trace/syscall.h:7:
   In file included from include/linux/trace_events.h:9:
   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:619:
   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:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:194:1: note: expanded from here
   __do_outsb
   ^
   arch/powerpc/include/asm/io.h:559:58: 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 kernel/kcmp.c:3:
   In file included from include/linux/syscalls.h:84:
   In file included from include/trace/syscall.h:7:
   In file included from include/linux/trace_events.h:9:
   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:619:
   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:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:196:1: note: expanded from here
   __do_outsw
   ^
   arch/powerpc/include/asm/io.h:560:58: 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 kernel/kcmp.c:3:
   In file included from include/linux/syscalls.h:84:
   In file included from include/trace/syscall.h:7:
   In file included from include/linux/trace_events.h:9:
   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:619:
   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:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:198:1: note: expanded from here
   __do_outsl
   ^
   arch/powerpc/include/asm/io.h:561:58: note: expanded from macro '__do_outsl'
   #define __do_outsl(p, b, n)     writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
                                           ~~~~~~~~~~~~~~~~~~~~~^
>> kernel/kcmp.c:117:13: error: implicit declaration of function 'get_epoll_tfile_raw_ptr' [-Werror,-Wimplicit-function-declaration]
           filp_tgt = get_epoll_tfile_raw_ptr(filp_epoll, slot.tfd, slot.toff);
                      ^
   kernel/kcmp.c:117:13: note: did you mean 'get_file_raw_ptr'?
   kernel/kcmp.c:62:1: note: 'get_file_raw_ptr' declared here
   get_file_raw_ptr(struct task_struct *task, unsigned int idx)
   ^
>> kernel/kcmp.c:117:11: warning: incompatible integer to pointer conversion assigning to 'struct file *' from 'int' [-Wint-conversion]
           filp_tgt = get_epoll_tfile_raw_ptr(filp_epoll, slot.tfd, slot.toff);
                    ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   13 warnings and 1 error generated.


vim +/get_epoll_tfile_raw_ptr +117 kernel/kcmp.c

d97b46a64674a2 Cyrill Gorcunov   2012-05-31   96  
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12   97  #ifdef CONFIG_EPOLL
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12   98  static int kcmp_epoll_target(struct task_struct *task1,
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12   99  			     struct task_struct *task2,
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  100  			     unsigned long idx1,
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  101  			     struct kcmp_epoll_slot __user *uslot)
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  102  {
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  103  	struct file *filp, *filp_epoll, *filp_tgt;
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  104  	struct kcmp_epoll_slot slot;
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  105  
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  106  	if (copy_from_user(&slot, uslot, sizeof(slot)))
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  107  		return -EFAULT;
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  108  
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  109  	filp = get_file_raw_ptr(task1, idx1);
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  110  	if (!filp)
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  111  		return -EBADF;
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  112  
f43c283a89a7dc Eric W. Biederman 2020-11-20  113  	filp_epoll = fget_task(task2, slot.efd);
f43c283a89a7dc Eric W. Biederman 2020-11-20  114  	if (!filp_epoll)
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  115  		return -EBADF;
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  116  
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12 @117  	filp_tgt = get_epoll_tfile_raw_ptr(filp_epoll, slot.tfd, slot.toff);
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  118  	fput(filp_epoll);
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  119  
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  120  	if (IS_ERR(filp_tgt))
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  121  		return PTR_ERR(filp_tgt);
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  122  
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  123  	return kcmp_ptr(filp, filp_tgt, KCMP_FILE);
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  124  }
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  125  #else
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  126  static int kcmp_epoll_target(struct task_struct *task1,
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  127  			     struct task_struct *task2,
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  128  			     unsigned long idx1,
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  129  			     struct kcmp_epoll_slot __user *uslot)
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  130  {
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  131  	return -EOPNOTSUPP;
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  132  }
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  133  #endif
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  134  

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