1:39 p.m.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
linux-4.4.y
head: 38c92ba3580f0d00e57a55caf8f880aa1a0f2a50
commit: ade5180681d778d36b569ad35cc175ab22196c5f [1449/1774] Input: joydev - prevent
potential read overflow in ioctl
config: h8300-randconfig-r031-20210718 (attached as .config)
compiler: h8300-linux-gcc (GCC) 10.3.0
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
#
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.gi...
git remote add linux-stable-rc
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
git fetch --no-tags linux-stable-rc linux-4.4.y
git checkout ade5180681d778d36b569ad35cc175ab22196c5f
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=h8300
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com>
All warnings (new ones prefixed by >>):
In file included from arch/h8300/include/generated/asm/uaccess.h:1,
from include/linux/poll.h:11,
from drivers/input/joydev.c:27:
include/asm-generic/uaccess.h: In function '__put_user_fn':
include/asm-generic/uaccess.h:178:16: warning: operand of '?:' changes
signedness from 'int' to 'size_t' {aka 'long unsigned int'} due to
unsignedness of other operand [-Wsign-compare]
178 | return size ? -EFAULT : size;
drivers/input/joydev.c: In function 'joydev_handle_JSIOCSAXMAP':
drivers/input/joydev.c:451:16: warning: comparison of integer expressions of different
signedness: 'int' and 'size_t' {aka 'long unsigned int'}
[-Wsign-compare]
451 | for (i = 0; i < len && i < joydev->nabs; i++) {
| ^
drivers/input/joydev.c: In function 'joydev_handle_JSIOCSBTNMAP':
> drivers/input/joydev.c:485:16: warning: comparison of integer
expressions of different signedness: 'int' and 'long unsigned int'
[-Wsign-compare]
485 | for (i = 0; i < (len / 2) && i <
joydev->nkey; i++) {
| ^
drivers/input/joydev.c: In function 'joydev_ioctl_common':
drivers/input/joydev.c:566:52: warning: operand of '?:' changes signedness from
'int' to 'size_t' {aka 'long unsigned int'} due to unsignedness of
other operand [-Wsign-compare]
566 | return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len;
drivers/input/joydev.c:573:52: warning: operand of '?:' changes signedness from
'int' to 'size_t' {aka 'long unsigned int'} due to unsignedness of
other operand [-Wsign-compare]
573 | return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len;
drivers/input/joydev.c:581:42: warning: operand of '?:' changes signedness from
'int' to 'size_t' {aka 'long unsigned int'} due to unsignedness of
other operand [-Wsign-compare]
581 | return copy_to_user(argp, name, len) ? -EFAULT : len;
vim +485 drivers/input/joydev.c
467
468 static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
469 void __user *argp, size_t len)
470 {
471 __u16 *keypam;
472 int i;
473 int retval = 0;
474
475 if (len % sizeof(*keypam))
476 return -EINVAL;
477
478 len = min(len, sizeof(joydev->keypam));
479
480 /* Validate the map. */
481 keypam = memdup_user(argp, len);
482 if (IS_ERR(keypam))
483 return PTR_ERR(keypam);
484
485 for (i = 0; i < (len / 2) && i < joydev->nkey;
i++) {
486 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) {
487 retval = -EINVAL;
488 goto out;
489 }
490 }
491
492 memcpy(joydev->keypam, keypam, len);
493
494 for (i = 0; i < joydev->nkey; i++)
495 joydev->keymap[keypam[i] - BTN_MISC] = i;
496
497 out:
498 kfree(keypam);
499 return retval;
500 }
501
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org