Re: [CFT][PATCH] ptrace: Properly initialize ptracer_cred on fork

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

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Hi Eric,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.12-rc2 next-20170523]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Eric-W-Biederman/ptrace-Properly-initialize-ptracer_cred-on-fork/20170523-143551
config: alpha-defconfig (attached as .config)
compiler: alpha-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=alpha 

All errors (new ones prefixed by >>):

   In file included from ./arch/alpha/include/generated/asm/current.h:1:0,
                    from include/linux/wait.h:10,
                    from include/linux/mmzone.h:9,
                    from include/linux/gfp.h:5,
                    from include/linux/mm.h:9,
                    from include/linux/pagemap.h:7,
                    from arch/alpha/mm/init.c:9:
   include/linux/ptrace.h: In function 'ptrace_init_task':
>> include/asm-generic/current.h:6:23: error: passing argument 3 of '__ptrace_link' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
    #define get_current() (current_thread_info()->task)
                          ^
   include/asm-generic/current.h:7:17: note: in expansion of macro 'get_current'
    #define current get_current()
                    ^~~~~~~~~~~
   include/linux/ptrace.h:210:41: note: in expansion of macro 'current'
      __ptrace_link(child, current->parent, current->ptracer_cred);
                                            ^~~~~~~
   In file included from arch/alpha/mm/init.c:16:0:
   include/linux/ptrace.h:56:13: note: expected 'struct cred *' but argument is of type 'const struct cred *'
    extern void __ptrace_link(struct task_struct *child,
                ^~~~~~~~~~~~~
   cc1: all warnings being treated as errors

vim +6 include/asm-generic/current.h

aafe4dbe Arnd Bergmann 2009-05-13  1  #ifndef __ASM_GENERIC_CURRENT_H
aafe4dbe Arnd Bergmann 2009-05-13  2  #define __ASM_GENERIC_CURRENT_H
aafe4dbe Arnd Bergmann 2009-05-13  3  
aafe4dbe Arnd Bergmann 2009-05-13  4  #include <linux/thread_info.h>
aafe4dbe Arnd Bergmann 2009-05-13  5  
aafe4dbe Arnd Bergmann 2009-05-13 @6  #define get_current() (current_thread_info()->task)
aafe4dbe Arnd Bergmann 2009-05-13  7  #define current get_current()
aafe4dbe Arnd Bergmann 2009-05-13  8  
aafe4dbe Arnd Bergmann 2009-05-13  9  #endif /* __ASM_GENERIC_CURRENT_H */

:::::: The code at line 6 was first introduced by commit
:::::: aafe4dbed0bf6cbdb2e9f03e1d42f8a540d8541d asm-generic: add generic versions of common headers

:::::: TO: Arnd Bergmann <arnd@arndb.de>
:::::: CC: Arnd Bergmann <arnd@klappe2.(none)>

---
0-DAY kernel test infrastructure                Open Source Technology Center
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