kernel/sched/psi.c:1193:6: warning: no previous prototype for function 'psi_trigger_destroy'

From: kernel test robot
Date: Mon Jan 24 2022 - 22:24:49 EST

Next message: Wei Yang: "Re: [PATCH] mm: remove offset check on page->compound_head and folio->lru"
Previous message: Phillip Potter: "[PATCH 06/10] staging: r8188eu: remove DBG_88E calls from os_dep/ioctl_linux.c"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: dd81e1c7d5fb126e5fbc5c9e334d7b3ec29a16a0
commit: a06247c6804f1a7c86a2e5398a4c1f1db1471848 psi: Fix uaf issue when psi trigger is destroyed while being polled
date: 7 days ago
config: s390-randconfig-r044-20220124 (https://download.01.org/0day-ci/archive/20220125/202201251121.19DMWalx-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 2e58a18910867ba6795066e044293e6daf89edf5)
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
# install s390 cross compiling tool for clang build
# apt-get install binutils-s390x-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a06247c6804f1a7c86a2e5398a4c1f1db1471848
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout a06247c6804f1a7c86a2e5398a4c1f1db1471848
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash kernel/sched/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

In file included from kernel/sched/psi.c:153:
In file included from kernel/sched/sched.h:17:
In file included from include/linux/sched/isolation.h:6:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:22:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __raw_readb(PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
#define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
#define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
^
In file included from kernel/sched/psi.c:153:
In file included from kernel/sched/sched.h:17:
In file included from include/linux/sched/isolation.h:6:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:22:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
#define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
^
In file included from kernel/sched/psi.c:153:
In file included from kernel/sched/sched.h:17:
In file included from include/linux/sched/isolation.h:6:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:22:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
kernel/sched/psi.c:1123:21: warning: no previous prototype for function 'psi_trigger_create' [-Wmissing-prototypes]
struct psi_trigger *psi_trigger_create(struct psi_group *group,
^
kernel/sched/psi.c:1123:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
struct psi_trigger *psi_trigger_create(struct psi_group *group,
^
static
>> kernel/sched/psi.c:1193:6: warning: no previous prototype for function 'psi_trigger_destroy' [-Wmissing-prototypes]
void psi_trigger_destroy(struct psi_trigger *t)
^
kernel/sched/psi.c:1193:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void psi_trigger_destroy(struct psi_trigger *t)
^
static
kernel/sched/psi.c:1260:10: warning: no previous prototype for function 'psi_trigger_poll' [-Wmissing-prototypes]
__poll_t psi_trigger_poll(void **trigger_ptr,
^
kernel/sched/psi.c:1260:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
__poll_t psi_trigger_poll(void **trigger_ptr,
^
static
15 warnings generated.

vim +/psi_trigger_destroy +1193 kernel/sched/psi.c

1192
> 1193 void psi_trigger_destroy(struct psi_trigger *t)
1194 {
1195 struct psi_group *group;
1196 struct task_struct *task_to_destroy = NULL;
1197
1198 /*
1199 * We do not check psi_disabled since it might have been disabled after
1200 * the trigger got created.
1201 */
1202 if (!t)
1203 return;
1204
1205 group = t->group;
1206 /*
1207 * Wakeup waiters to stop polling. Can happen if cgroup is deleted
1208 * from under a polling process.
1209 */
1210 wake_up_interruptible(&t->event_wait);
1211
1212 mutex_lock(&group->trigger_lock);
1213
1214 if (!list_empty(&t->node)) {
1215 struct psi_trigger *tmp;
1216 u64 period = ULLONG_MAX;
1217
1218 list_del(&t->node);
1219 group->nr_triggers[t->state]--;
1220 if (!group->nr_triggers[t->state])
1221 group->poll_states &= ~(1 << t->state);
1222 /* reset min update period for the remaining triggers */
1223 list_for_each_entry(tmp, &group->triggers, node)
1224 period = min(period, div_u64(tmp->win.size,
1225 UPDATES_PER_WINDOW));
1226 group->poll_min_period = period;
1227 /* Destroy poll_task when the last trigger is destroyed */
1228 if (group->poll_states == 0) {
1229 group->polling_until = 0;
1230 task_to_destroy = rcu_dereference_protected(
1231 group->poll_task,
1232 lockdep_is_held(&group->trigger_lock));
1233 rcu_assign_pointer(group->poll_task, NULL);
1234 del_timer(&group->poll_timer);
1235 }
1236 }
1237
1238 mutex_unlock(&group->trigger_lock);
1239
1240 /*
1241 * Wait for psi_schedule_poll_work RCU to complete its read-side
1242 * critical section before destroying the trigger and optionally the
1243 * poll_task.
1244 */
1245 synchronize_rcu();
1246 /*
1247 * Stop kthread 'psimon' after releasing trigger_lock to prevent a
1248 * deadlock while waiting for psi_poll_work to acquire trigger_lock
1249 */
1250 if (task_to_destroy) {
1251 /*
1252 * After the RCU grace period has expired, the worker
1253 * can no longer be found through group->poll_task.
1254 */
1255 kthread_stop(task_to_destroy);
1256 }
1257 kfree(t);
1258 }
1259

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

Next message: Wei Yang: "Re: [PATCH] mm: remove offset check on page->compound_head and folio->lru"
Previous message: Phillip Potter: "[PATCH 06/10] staging: r8188eu: remove DBG_88E calls from os_dep/ioctl_linux.c"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]