tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: d47175169c28eedd2cc2ab8c01f38764cb0269cc commit: f672e2c217e2d4b2e8fa6568f8d7f49e9dd2b8e6 [13874/13946] lib: untag user pointers in strn*_user config: sparc64-allmodconfig (attached as .config) compiler: sparc64-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout f672e2c217e2d4b2e8fa6568f8d7f49e9dd2b8e6 # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=sparc64 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> All error/warnings (new ones prefixed by >>): mm/gup.c: In function '__get_user_pages_fast': >> mm/gup.c:2321:42: error: expected ')' before ';' token start = untagged_addr(start) & PAGE_MASK; ^ >> mm/gup.c:2350:1: error: expected ';' before '}' token } ^ mm/gup.c:2319:6: warning: unused variable 'nr' [-Wunused-variable] int nr = 0; ^~ mm/gup.c:2318:16: warning: unused variable 'flags' [-Wunused-variable] unsigned long flags; ^~~~~ mm/gup.c:2317:21: warning: unused variable 'end' [-Wunused-variable] unsigned long len, end; ^~~ mm/gup.c:2317:16: warning: unused variable 'len' [-Wunused-variable] unsigned long len, end; ^~~ mm/gup.c: In function 'get_user_pages_fast': mm/gup.c:2401:42: error: expected ')' before ';' token start = untagged_addr(start) & PAGE_MASK; ^ mm/gup.c:2437:1: error: expected ';' before '}' token } ^ mm/gup.c:2396:14: warning: unused variable 'ret' [-Wunused-variable] int nr = 0, ret = 0; ^~~ mm/gup.c:2396:6: warning: unused variable 'nr' [-Wunused-variable] int nr = 0, ret = 0; ^~ mm/gup.c:2395:27: warning: unused variable 'end' [-Wunused-variable] unsigned long addr, len, end; ^~~ mm/gup.c:2395:22: warning: unused variable 'len' [-Wunused-variable] unsigned long addr, len, end; ^~~ mm/gup.c:2395:16: warning: unused variable 'addr' [-Wunused-variable] unsigned long addr, len, end; ^~~~ mm/gup.c: In function '__get_user_pages_fast': >> mm/gup.c:2350:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ mm/gup.c: In function 'get_user_pages_fast': mm/gup.c:2437:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ At top level: mm/gup.c:2353:12: warning: '__gup_longterm_unlocked' defined but not used [-Wunused-function] static int __gup_longterm_unlocked(unsigned long start, int nr_pages, ^~~~~~~~~~~~~~~~~~~~~~~ mm/gup.c:2299:13: warning: 'gup_fast_permitted' defined but not used [-Wunused-function] static bool gup_fast_permitted(unsigned long start, unsigned long end) ^~~~~~~~~~~~~~~~~~ mm/gup.c:2262:13: warning: 'gup_pgd_range' defined but not used [-Wunused-function] static void gup_pgd_range(unsigned long addr, unsigned long end, ^~~~~~~~~~~~~ -- lib/strncpy_from_user.c: In function 'strncpy_from_user': >> lib/strncpy_from_user.c:112:46: error: expected ')' before ';' token src_addr = (unsigned long)untagged_addr(src); ^ >> lib/strncpy_from_user.c:126:1: error: expected ';' before '}' token } ^ >> lib/strncpy_from_user.c:126:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ -- lib/strnlen_user.c: In function 'strnlen_user': >> lib/strnlen_user.c:113:46: error: expected ')' before ';' token src_addr = (unsigned long)untagged_addr(str); ^ >> lib/strnlen_user.c:125:1: error: expected ';' before '}' token } ^ >> lib/strnlen_user.c:125:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ vim +112 lib/strncpy_from_user.c 85 86 /** 87 * strncpy_from_user: - Copy a NUL terminated string from userspace. 88 * @dst: Destination address, in kernel space. This buffer must be at 89 * least @count bytes long. 90 * @src: Source address, in user space. 91 * @count: Maximum number of bytes to copy, including the trailing NUL. 92 * 93 * Copies a NUL-terminated string from userspace to kernel space. 94 * 95 * On success, returns the length of the string (not including the trailing 96 * NUL). 97 * 98 * If access to userspace fails, returns -EFAULT (some data may have been 99 * copied). 100 * 101 * If @count is smaller than the length of the string, copies @count bytes 102 * and returns @count. 103 */ 104 long strncpy_from_user(char *dst, const char __user *src, long count) 105 { 106 unsigned long max_addr, src_addr; 107 108 if (unlikely(count <= 0)) 109 return 0; 110 111 max_addr = user_addr_max(); > 112 src_addr = (unsigned long)untagged_addr(src); 113 if (likely(src_addr < max_addr)) { 114 unsigned long max = max_addr - src_addr; 115 long retval; 116 117 kasan_check_write(dst, count); 118 check_object_size(dst, count, false); 119 if (user_access_begin(src, max)) { 120 retval = do_strncpy_from_user(dst, src, count, max); 121 user_access_end(); 122 return retval; 123 } 124 } 125 return -EFAULT; > 126 } --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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