Re: [PATCH v4 2/4] fanotify: define struct members to hold response decision context

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On Fri, Aug 19, 2022 at 9:25 AM Richard Guy Briggs <rgb@xxxxxxxxxx> wrote:
>
> On 2022-08-10 22:28, kernel test robot wrote:
> > Hi Richard,
> >
> > Thank you for the patch! Perhaps something to improve:
> >
> > [auto build test WARNING on jack-fs/fsnotify]
> > [also build test WARNING on pcmoore-audit/next linus/master v5.19 next-20220810]
> > [If your patch is applied to the wrong git tree, kindly drop us a note.
> > And when submitting patch, we suggest to use '--base' as documented in
> > https://git-scm.com/docs/git-format-patch#_base_tree_information]
> >
> > url:    https://github.com/intel-lab-lkp/linux/commits/Richard-Guy-Briggs/fanotify-Allow-user-space-to-pass-back-additional-audit-info/20220810-012825
> > base:   https://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs.git fsnotify
> > config: i386-randconfig-a013 (https://download.01.org/0day-ci/archive/20220810/202208102231.qSUdYAdb-lkp@xxxxxxxxx/config)
> > compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 5f1c7e2cc5a3c07cbc2412e851a7283c1841f520)
> > 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://github.com/intel-lab-lkp/linux/commit/a943676abc023c094f05b45f4d61936c567507a2
> >         git remote add linux-review https://github.com/intel-lab-lkp/linux
> >         git fetch --no-tags linux-review Richard-Guy-Briggs/fanotify-Allow-user-space-to-pass-back-additional-audit-info/20220810-012825
> >         git checkout a943676abc023c094f05b45f4d61936c567507a2
> >         # save the config file
> >         mkdir build_dir && cp config build_dir/.config
> >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash fs/notify/fanotify/
> >
> > If you fix the issue, kindly add following tag where applicable
> > Reported-by: kernel test robot <lkp@xxxxxxxxx>
> >
> > All warnings (new ones prefixed by >>):
> >
> > >> fs/notify/fanotify/fanotify_user.c:325:35: warning: format specifies type 'unsigned long' but the argument has type 'size_t' (aka 'unsigned int') [-Wformat]
>
> Interesting.  When I "fix" it, my compiler complains:
>
>         fs/notify/fanotify/fanotify_user.c:324:11: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 8 has type ‘size_t’ {aka ‘long unsigned int’} [-Wformat=]

The correct format specifier for size_t is %zu.  This avoids issues
between ILP32 vs LP64 targets.

>
> >                     group, fd, response, info_buf, count);
> >                                                    ^~~~~
> >    include/linux/printk.h:594:38: note: expanded from macro 'pr_debug'
> >            no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
> >                                        ~~~     ^~~~~~~~~~~
> >    include/linux/printk.h:131:17: note: expanded from macro 'no_printk'
> >                    printk(fmt, ##__VA_ARGS__);             \
> >                           ~~~    ^~~~~~~~~~~
> >    include/linux/printk.h:464:60: note: expanded from macro 'printk'
> >    #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
> >                                                        ~~~    ^~~~~~~~~~~
> >    include/linux/printk.h:436:19: note: expanded from macro 'printk_index_wrap'
> >                    _p_func(_fmt, ##__VA_ARGS__);                           \
> >                            ~~~~    ^~~~~~~~~~~
> >    1 warning generated.
> >
> >
> > vim +325 fs/notify/fanotify/fanotify_user.c
> >
> >    312
> >    313        static int process_access_response(struct fsnotify_group *group,
> >    314                                           struct fanotify_response *response_struct,
> >    315                                           const char __user *buf,
> >    316                                           size_t count)
> >    317        {
> >    318                struct fanotify_perm_event *event;
> >    319                int fd = response_struct->fd;
> >    320                u32 response = response_struct->response;
> >    321                struct fanotify_response_info_header info_hdr;
> >    322                char *info_buf = NULL;
> >    323
> >    324                pr_debug("%s: group=%p fd=%d response=%u buf=%p size=%lu\n", __func__,
> >  > 325                         group, fd, response, info_buf, count);
> >    326                /*
> >    327                 * make sure the response is valid, if invalid we do nothing and either
> >    328                 * userspace can send a valid response or we will clean it up after the
> >    329                 * timeout
> >    330                 */
> >    331                if (response & ~FANOTIFY_RESPONSE_VALID_MASK)
> >    332                        return -EINVAL;
> >    333                switch (response & FANOTIFY_RESPONSE_ACCESS) {
> >    334                case FAN_ALLOW:
> >    335                case FAN_DENY:
> >    336                        break;
> >    337                default:
> >    338                        return -EINVAL;
> >    339                }
> >    340                if ((response & FAN_AUDIT) && !FAN_GROUP_FLAG(group, FAN_ENABLE_AUDIT))
> >    341                        return -EINVAL;
> >    342                if (fd < 0)
> >    343                        return -EINVAL;
> >    344                if (response & FAN_INFO) {
> >    345                        size_t c = count;
> >    346                        const char __user *ib = buf;
> >    347
> >    348                        if (c <= 0)
> >    349                                return -EINVAL;
> >    350                        while (c >= sizeof(info_hdr)) {
> >    351                                if (copy_from_user(&info_hdr, ib, sizeof(info_hdr)))
> >    352                                        return -EFAULT;
> >    353                                if (info_hdr.pad != 0)
> >    354                                        return -EINVAL;
> >    355                                if (c < info_hdr.len)
> >    356                                        return -EINVAL;
> >    357                                switch (info_hdr.type) {
> >    358                                case FAN_RESPONSE_INFO_AUDIT_RULE:
> >    359                                        break;
> >    360                                case FAN_RESPONSE_INFO_NONE:
> >    361                                default:
> >    362                                        return -EINVAL;
> >    363                                }
> >    364                                c -= info_hdr.len;
> >    365                                ib += info_hdr.len;
> >    366                        }
> >    367                        if (c != 0)
> >    368                                return -EINVAL;
> >    369                        /* Simplistic check for now */
> >    370                        if (count != sizeof(struct fanotify_response_info_audit_rule))
> >    371                                return -EINVAL;
> >    372                        info_buf = kmalloc(sizeof(struct fanotify_response_info_audit_rule),
> >    373                                           GFP_KERNEL);
> >    374                        if (!info_buf)
> >    375                                return -ENOMEM;
> >    376                        if (copy_from_user(info_buf, buf, count))
> >    377                                return -EFAULT;
> >    378                }
> >    379                spin_lock(&group->notification_lock);
> >    380                list_for_each_entry(event, &group->fanotify_data.access_list,
> >    381                                    fae.fse.list) {
> >    382                        if (event->fd != fd)
> >    383                                continue;
> >    384
> >    385                        list_del_init(&event->fae.fse.list);
> >    386                        /* finish_permission_event() eats info_buf */
> >    387                        finish_permission_event(group, event, response_struct,
> >    388                                                count, info_buf);
> >    389                        wake_up(&group->fanotify_data.access_waitq);
> >    390                        return 0;
> >    391                }
> >    392                spin_unlock(&group->notification_lock);
> >    393
> >    394                return -ENOENT;
> >    395        }
> >    396
> >
> > --
> > 0-DAY CI Kernel Test Service
> > https://01.org/lkp
> >
>
> - RGB
>
> --
> Richard Guy Briggs <rgb@xxxxxxxxxx>
> Sr. S/W Engineer, Kernel Security, Base Operating Systems
> Remote, Ottawa, Red Hat Canada
> IRC: rgb, SunRaycer
> Voice: +1.647.777.2635, Internal: (81) 32635
>
>


-- 
Thanks,
~Nick Desaulniers




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