From: kbuild test robot <lkp@intel.com>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: kbuild-all@01.org, Roman Gushchin <guro@fb.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Khalid Aziz <khalid.aziz@oracle.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linux Memory Management List <linux-mm@kvack.org>
Subject: [rgushchin:fix_vmstats 199/221] lib/strncpy_from_user.c:112:42: warning: passing argument 1 of 'untagged_addr' makes integer from pointer without a cast
Date: Tue, 13 Aug 2019 22:00:38 +0800 [thread overview]
Message-ID: <201908132234.dxi9IQrs%lkp@intel.com> (raw)
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tree: https://github.com/rgushchin/linux.git fix_vmstats
head: 4ec858b5201ae067607e82706b36588631c1b990
commit: f198eb8345ed9cef77b65d1c0edffba3fa3f6d2a [199/221] 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 f198eb8345ed9cef77b65d1c0edffba3fa3f6d2a
# 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@intel.com>
All warnings (new ones prefixed by >>):
lib/strncpy_from_user.c: In function 'strncpy_from_user':
>> lib/strncpy_from_user.c:112:42: warning: passing argument 1 of 'untagged_addr' makes integer from pointer without a cast [-Wint-conversion]
src_addr = (unsigned long)untagged_addr(src);
^~~
In file included from arch/sparc/include/asm/pgtable.h:5:0,
from include/linux/mm.h:99,
from lib/strncpy_from_user.c:9:
arch/sparc/include/asm/pgtable_64.h:1081:29: note: expected 'long unsigned int' but argument is of type 'const char *'
static inline unsigned long untagged_addr(unsigned long start)
^~~~~~~~~~~~~
--
lib/strnlen_user.c: In function 'strnlen_user':
>> lib/strnlen_user.c:113:42: warning: passing argument 1 of 'untagged_addr' makes integer from pointer without a cast [-Wint-conversion]
src_addr = (unsigned long)untagged_addr(str);
^~~
In file included from arch/sparc/include/asm/pgtable.h:5:0,
from include/linux/mm.h:99,
from lib/strnlen_user.c:5:
arch/sparc/include/asm/pgtable_64.h:1081:29: note: expected 'long unsigned int' but argument is of type 'const char *'
static inline unsigned long untagged_addr(unsigned long start)
^~~~~~~~~~~~~
vim +/untagged_addr +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);
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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next reply other threads:[~2019-08-13 14:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-13 14:00 kbuild test robot [this message]
2019-08-13 16:01 ` [rgushchin:fix_vmstats 199/221] lib/strncpy_from_user.c:112:42: warning: passing argument 1 of 'untagged_addr' makes integer from pointer without a cast Andrey Konovalov
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