11:55 a.m.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git set_fs
head: 2a0bc55bf1de54742196464620860bbc46592f11
commit: e7e49ac844a31b9eebb95e85b0e20696aa646280 [6/11] uaccess: generalize access_ok()
config: arc-randconfig-s031-20220213
(https://download.01.org/0day-ci/archive/20220214/202202140815.nUkV6yfz-lk...)
compiler: arc-elf-gcc (GCC) 11.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O
~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-dirty
#
https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git/commi...
git remote add arnd-playground
https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git
git fetch --no-tags arnd-playground set_fs
git checkout e7e49ac844a31b9eebb95e85b0e20696aa646280
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1
CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arc SHELL=/bin/bash
arch/arc/kernel/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com>
sparse warnings: (new ones prefixed by >>)
> arch/arc/kernel/process.c:63:15: sparse: sparse: incorrect type
in argument 1 (different address spaces) @@ expected void const [noderef] __user *ptr
@@ got int *uaddr @@
arch/arc/kernel/process.c:63:15: sparse: expected
void const [noderef] __user *ptr
arch/arc/kernel/process.c:63:15: sparse: got int *uaddr
arch/arc/kernel/process.c:70:15: sparse: sparse: incorrect type in argument 1
(different address spaces) @@ expected void const volatile [noderef] __user *ptr @@
got int *uaddr @@
arch/arc/kernel/process.c:70:15: sparse: expected void const volatile [noderef]
__user *ptr
arch/arc/kernel/process.c:70:15: sparse: got int *uaddr
arch/arc/kernel/process.c:77:15: sparse: sparse: incorrect type in argument 1
(different address spaces) @@ expected void const volatile [noderef] __user *ptr @@
got int *uaddr @@
arch/arc/kernel/process.c:77:15: sparse: expected void const volatile [noderef]
__user *ptr
arch/arc/kernel/process.c:77:15: sparse: got int *uaddr
vim +63 arch/arc/kernel/process.c
bf90e1eab682dc Vineet Gupta 2013-01-18 45
91e040a79df73d Vineet Gupta 2016-10-20 46 SYSCALL_DEFINE3(arc_usr_cmpxchg, int *,
uaddr, int, expected, int, new)
91e040a79df73d Vineet Gupta 2016-10-20 47 {
e6e335bf3a400b Vineet Gupta 2016-11-07 48 struct pt_regs *regs =
current_pt_regs();
e8708786d4fe21 Peter Zijlstra 2018-06-19 49 u32 uval;
e8708786d4fe21 Peter Zijlstra 2018-06-19 50 int ret;
91e040a79df73d Vineet Gupta 2016-10-20 51
91e040a79df73d Vineet Gupta 2016-10-20 52 /*
f79f7a2d96769d Bhaskar Chowdhury 2021-03-22 53 * This is only for old cores lacking
LLOCK/SCOND, which by definition
91e040a79df73d Vineet Gupta 2016-10-20 54 * can't possibly be SMP. Thus
doesn't need to be SMP safe.
91e040a79df73d Vineet Gupta 2016-10-20 55 * And this also helps reduce the
overhead for serializing in
91e040a79df73d Vineet Gupta 2016-10-20 56 * the UP case
91e040a79df73d Vineet Gupta 2016-10-20 57 */
91e040a79df73d Vineet Gupta 2016-10-20 58 WARN_ON_ONCE(IS_ENABLED(CONFIG_SMP));
91e040a79df73d Vineet Gupta 2016-10-20 59
f79f7a2d96769d Bhaskar Chowdhury 2021-03-22 60 /* Z indicates to userspace if
operation succeeded */
e6e335bf3a400b Vineet Gupta 2016-11-07 61 regs->status32 &=
~STATUS_Z_MASK;
e6e335bf3a400b Vineet Gupta 2016-11-07 62
96d4f267e40f95 Linus Torvalds 2019-01-03 @63 ret = access_ok(uaddr,
sizeof(*uaddr));
e8708786d4fe21 Peter Zijlstra 2018-06-19 64 if (!ret)
e8708786d4fe21 Peter Zijlstra 2018-06-19 65 goto fail;
91e040a79df73d Vineet Gupta 2016-10-20 66
e8708786d4fe21 Peter Zijlstra 2018-06-19 67 again:
91e040a79df73d Vineet Gupta 2016-10-20 68 preempt_disable();
91e040a79df73d Vineet Gupta 2016-10-20 69
e8708786d4fe21 Peter Zijlstra 2018-06-19 70 ret = __get_user(uval, uaddr);
e8708786d4fe21 Peter Zijlstra 2018-06-19 71 if (ret)
e8708786d4fe21 Peter Zijlstra 2018-06-19 72 goto fault;
e8708786d4fe21 Peter Zijlstra 2018-06-19 73
e8708786d4fe21 Peter Zijlstra 2018-06-19 74 if (uval != expected)
e8708786d4fe21 Peter Zijlstra 2018-06-19 75 goto out;
e8708786d4fe21 Peter Zijlstra 2018-06-19 76
e8708786d4fe21 Peter Zijlstra 2018-06-19 77 ret = __put_user(new, uaddr);
e8708786d4fe21 Peter Zijlstra 2018-06-19 78 if (ret)
e8708786d4fe21 Peter Zijlstra 2018-06-19 79 goto fault;
91e040a79df73d Vineet Gupta 2016-10-20 80
e6e335bf3a400b Vineet Gupta 2016-11-07 81 regs->status32 |= STATUS_Z_MASK;
91e040a79df73d Vineet Gupta 2016-10-20 82
e8708786d4fe21 Peter Zijlstra 2018-06-19 83 out:
91e040a79df73d Vineet Gupta 2016-10-20 84 preempt_enable();
e6e335bf3a400b Vineet Gupta 2016-11-07 85 return uval;
e8708786d4fe21 Peter Zijlstra 2018-06-19 86
e8708786d4fe21 Peter Zijlstra 2018-06-19 87 fault:
e8708786d4fe21 Peter Zijlstra 2018-06-19 88 preempt_enable();
e8708786d4fe21 Peter Zijlstra 2018-06-19 89
e8708786d4fe21 Peter Zijlstra 2018-06-19 90 if (unlikely(ret != -EFAULT))
e8708786d4fe21 Peter Zijlstra 2018-06-19 91 goto fail;
e8708786d4fe21 Peter Zijlstra 2018-06-19 92
d8ed45c5dcd455 Michel Lespinasse 2020-06-08 93 mmap_read_lock(current->mm);
64019a2e467a28 Peter Xu 2020-08-11 94 ret = fixup_user_fault(current->mm,
(unsigned long) uaddr,
e8708786d4fe21 Peter Zijlstra 2018-06-19 95 FAULT_FLAG_WRITE, NULL);
d8ed45c5dcd455 Michel Lespinasse 2020-06-08 96 mmap_read_unlock(current->mm);
e8708786d4fe21 Peter Zijlstra 2018-06-19 97
e8708786d4fe21 Peter Zijlstra 2018-06-19 98 if (likely(!ret))
e8708786d4fe21 Peter Zijlstra 2018-06-19 99 goto again;
e8708786d4fe21 Peter Zijlstra 2018-06-19 100
e8708786d4fe21 Peter Zijlstra 2018-06-19 101 fail:
3cf5d076fb4d48 Eric W. Biederman 2019-05-23 102 force_sig(SIGSEGV);
e8708786d4fe21 Peter Zijlstra 2018-06-19 103 return ret;
91e040a79df73d Vineet Gupta 2016-10-20 104 }
91e040a79df73d Vineet Gupta 2016-10-20 105
:::::: The code at line 63 was first introduced by commit
:::::: 96d4f267e40f9509e8a66e2b39e8b95655617693 Remove 'type' argument from
access_ok() function
:::::: TO: Linus Torvalds <torvalds(a)linux-foundation.org>
:::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org