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Quentin Perret 6d2f8909a5 sched: Fix out-of-bound access in uclamp 
Util-clamp places tasks in different buckets based on their clamp values
for performance reasons. However, the size of buckets is currently
computed using a rounding division, which can lead to an off-by-one
error in some configurations.

For instance, with 20 buckets, the bucket size will be 1024/20=51. A
task with a clamp of 1024 will be mapped to bucket id 1024/51=20. Sadly,
correct indexes are in range [0,19], hence leading to an out of bound
memory access.

Clamp the bucket id to fix the issue.

Fixes: 69842cba9ace ("sched/uclamp: Add CPU's clamp buckets refcounting")
Suggested-by: Qais Yousef <qais.yousef@arm.com>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Link: https://lkml.kernel.org/r/20210430151412.160913-1-qperret@google.com
2021-05-06 15:33:26 +02:00
..
bpf
selinux/stable-5.13 PR 20210426
2021-04-27 13:42:11 -07:00
cgroup
cgroup: use tsk->in_iowait instead of delayacct_is_task_waiting_on_io()
2021-04-16 16:49:37 -04:00
configs
staging: ION: remove some references to CONFIG_ION
2021-01-06 17:39:38 +01:00
debug
printk changes for 5.13
2021-04-27 18:09:44 -07:00
dma
Merge branch 'stable/for-linus-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb
2021-02-26 13:59:32 -08:00
entry
A trivial cleanup of typo fixes.
2021-04-26 09:41:15 -07:00
events
perf: Extend PERF_TYPE_HARDWARE and PERF_TYPE_HW_CACHE
2021-04-19 20:03:29 +02:00
gcov
Revert "gcov: clang: fix clang-11+ build"
2021-04-19 15:08:49 -07:00
irq
The usual updates from the irq departement:
2021-04-26 09:43:16 -07:00
kcsan
kcsan: Fix printk format string
2021-04-22 14:36:03 +02:00
livepatch
Livepatching changes for 5.13
2021-04-27 18:14:38 -07:00
locking
Locking changes for this cycle were:
2021-04-28 12:37:53 -07:00
power
PM: sleep: fix typos in comments
2021-04-08 19:37:21 +02:00
printk
kernel/printk.c: Fixed mundane typos
2021-03-30 15:34:17 +02:00
rcu
Merge branches 'bitmaprange.2021.03.08a', 'fixes.2021.03.15a', 'kvfree_rcu.2021.03.08a', 'mmdumpobj.2021.03.08a', 'nocb.2021.03.15a', 'poll.2021.03.24a', 'rt.2021.03.08a', 'tasks.2021.03.08a', 'torture.2021.03.08a' and 'torturescript.2021.03.22a' into HEAD
2021-03-24 17:20:18 -07:00
sched
sched: Fix out-of-bound access in uclamp
2021-05-06 15:33:26 +02:00
time
Power management updates for 5.13-rc1
2021-04-26 15:10:25 -07:00
trace
The usual updates from the irq departement:
2021-04-26 09:43:16 -07:00
.gitignore
…
acct.c
kernel/acct.c: use #elif instead of #end and #elif
2020-12-15 22:46:15 -08:00
async.c
treewide: Remove uninitialized_var() usage
2020-07-16 12:35:15 -07:00
audit_fsnotify.c
audit_alloc_mark(): don't open-code ERR_CAST()
2021-02-23 10:25:27 -05:00
audit_tree.c
fsnotify: generalize handle_inode_event()
2020-12-03 14:58:35 +01:00
audit_watch.c
fsnotify: generalize handle_inode_event()
2020-12-03 14:58:35 +01:00
audit.c
lsm: separate security_task_getsecid() into subjective and objective variants
2021-03-22 15:23:32 -04:00
audit.h
audit: avoid -Wempty-body warning
2021-03-24 12:11:48 -04:00
auditfilter.c
lsm: separate security_task_getsecid() into subjective and objective variants
2021-03-22 15:23:32 -04:00
auditsc.c
audit/stable-5.13 PR 20210426
2021-04-27 13:50:58 -07:00
backtracetest.c
treewide: Replace DECLARE_TASKLET() with DECLARE_TASKLET_OLD()
2020-07-30 11:15:58 -07:00
bounds.c
…
capability.c
capability: handle idmapped mounts
2021-01-24 14:27:16 +01:00
cfi.c
add support for Clang CFI
2021-04-08 16:04:20 -07:00
compat.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
configs.c
…
context_tracking.c
…
cpu_pm.c
notifier: Fix broken error handling pattern
2020-09-01 09:58:03 +02:00
cpu.c
cpumask/hotplug: Fix cpu_dying() state tracking
2021-04-21 13:55:43 +02:00
crash_core.c
kdump: append uts_namespace.name offset to VMCOREINFO
2020-12-15 22:46:18 -08:00
crash_dump.c
…
cred.c
…
delayacct.c
…
dma.c
…
exec_domain.c
…
exit.c
signal: Allow tasks to cache one sigqueue struct
2021-04-14 18:04:08 +02:00
extable.c
…
fail_function.c
fault-injection: handle EI_ETYPE_TRUE
2020-12-15 22:46:19 -08:00
fork.c
for-5.13/io_uring-2021-04-27
2021-04-28 14:56:09 -07:00
freezer.c
Revert "kernel: freezer should treat PF_IO_WORKER like PF_KTHREAD for freezing"
2021-03-27 14:09:10 -06:00
futex.c
Linux 5.12-rc5
2021-03-29 15:56:48 +02:00
gen_kheaders.sh
…
groups.c
groups: simplify struct group_info allocation
2021-02-26 09:41:03 -08:00
hung_task.c
kernel/hung_task.c: make type annotations consistent
2020-11-02 12:14:19 -08:00
iomem.c
…
irq_work.c
irq_work: Optimize irq_work_single()
2020-11-24 16:47:49 +01:00
jump_label.c
static_call: Fix static_call_update() sanity check
2021-03-19 13:16:44 +01:00
kallsyms.c
kallsyms: strip ThinLTO hashes from static functions
2021-04-08 16:04:21 -07:00
kcmp.c
Merge branch 'exec-update-lock-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:36:48 -08:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
preempt: Introduce CONFIG_PREEMPT_DYNAMIC
2021-02-17 14:12:24 +01:00
kcov.c
kernel: make kcov_common_handle consider the current context
2020-11-02 18:00:20 -08:00
kexec_core.c
Merge branch 'work.elf-compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2021-02-21 09:29:23 -08:00
kexec_elf.c
…
kexec_file.c
ima: Free IMA measurement buffer after kexec syscall
2021-02-10 15:49:38 -05:00
kexec_internal.h
kexec: move machine_kexec_post_load() to public interface
2021-02-22 12:33:26 +00:00
kexec.c
LSM: Introduce kernel_post_load_data() hook
2020-10-05 13:37:03 +02:00
kheaders.c
…
kmod.c
kmod: remove redundant "be an" in the comment
2020-08-12 10:58:01 -07:00
kprobes.c
kprobes: Fix to delay the kprobes jump optimization
2021-02-19 14:57:12 -05:00
ksysfs.c
…
kthread.c
Scheduler updates for this cycle are:
2021-04-28 13:33:57 -07:00
latencytop.c
…
Makefile
add support for Clang CFI
2021-04-08 16:04:20 -07:00
module_signature.c
module: harden ELF info handling
2021-01-19 10:24:45 +01:00
module_signing.c
module: harden ELF info handling
2021-01-19 10:24:45 +01:00
module-internal.h
…
module.c
add support for Clang CFI
2021-04-08 16:04:20 -07:00
notifier.c
notifier: Fix broken error handling pattern
2020-09-01 09:58:03 +02:00
nsproxy.c
fixes-v5.11
2020-12-14 16:40:27 -08:00
padata.c
padata: fix possible padata_works_lock deadlock
2020-09-04 17:51:55 +10:00
panic.c
panic: don't dump stack twice on warn
2020-11-14 11:26:04 -08:00
params.c
Modules updates for v5.11
2020-12-17 13:01:31 -08:00
pid_namespace.c
fixes-v5.11
2020-12-14 16:40:27 -08:00
pid.c
Merge branch 'exec-update-lock-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:36:48 -08:00
profile.c
kernel: Initialize cpumask before parsing
2021-04-10 13:35:54 +02:00
ptrace.c
Linux 5.12-rc8
2021-04-20 10:13:58 +02:00
range.c
kernel.h: split out min()/max() et al. helpers
2020-10-16 11:11:19 -07:00
reboot.c
Revert "PM: ACPI: reboot: Use S5 for reboot"
2021-03-18 16:58:02 +01:00
regset.c
regset: kill ->get()
2020-07-27 14:31:12 -04:00
relay.c
relay: allow the use of const callback structs
2020-12-15 22:46:18 -08:00
resource_kunit.c
resource: provide meaningful MODULE_LICENSE() in test suite
2020-11-25 18:52:35 +01:00
resource.c
resource: Move devmem revoke code to resource framework
2021-01-12 14:26:31 +01:00
rseq.c
rseq: Optimise rseq_get_rseq_cs() and clear_rseq_cs()
2021-04-14 18:04:09 +02:00
scftorture.c
scftorture: Add debug output for wrong-CPU warning
2021-01-04 13:53:41 -08:00
scs.c
scs: switch to vmapped shadow stacks
2020-12-01 10:30:28 +00:00
seccomp.c
seccomp: Fix "cacheable" typo in comments
2021-03-30 22:34:30 -07:00
signal.c
Scheduler updates for this cycle are:
2021-04-28 13:33:57 -07:00
smp.c
Merge branch 'locking/core' into x86/mm, to resolve conflict
2021-03-06 13:00:58 +01:00
smpboot.c
kthread: Extract KTHREAD_IS_PER_CPU
2021-01-22 15:09:42 +01:00
smpboot.h
…
softirq.c
RCU changes for this cycle were:
2021-04-28 12:00:13 -07:00
stackleak.c
stackleak: let stack_erasing_sysctl take a kernel pointer buffer
2020-09-19 13:13:39 -07:00
stacktrace.c
stacktrace: Remove reliable argument from arch_stack_walk() callback
2020-09-18 14:24:16 +01:00
static_call.c
static_call: Fix unused variable warn w/o MODULE
2021-04-09 13:22:12 +02:00
stop_machine.c
stop_machine: Add caller debug info to queue_stop_cpus_work
2021-03-23 16:01:58 +01:00
sys_ni.c
quota: wire up quotactl_path
2021-03-17 15:51:17 +01:00
sys.c
arm64: Introduce prctl(PR_PAC_{SET,GET}_ENABLED_KEYS)
2021-04-13 17:31:44 +01:00
sysctl-test.c
…
sysctl.c
\n
2021-04-29 11:06:13 -07:00
task_work.c
task_work: add helper for more targeted task_work canceling
2021-04-11 19:30:25 -06:00
taskstats.c
treewide: rename nla_strlcpy to nla_strscpy.
2020-11-16 08:08:54 -08:00
test_kprobes.c
…
torture.c
torture: Replace torture_init_begin string with %s
2021-03-08 14:22:28 -08:00
tracepoint.c
tracepoints: Code clean up
2021-02-09 12:27:29 -05:00
tsacct.c
…
ucount.c
fanotify: configurable limits via sysfs
2021-03-16 16:49:31 +01:00
uid16.c
…
uid16.h
…
umh.c
usermodehelper: reset umask to default before executing user process
2020-10-06 10:31:52 -07:00
up.c
smp: Inline on_each_cpu_cond() and on_each_cpu()
2021-03-06 12:59:10 +01:00
user_namespace.c
capabilities: require CAP_SETFCAP to map uid 0
2021-04-20 14:28:33 -07:00
user-return-notifier.c
…
user.c
user: Use generic ns_common::count
2020-08-19 14:14:12 +02:00
usermode_driver.c
bpf: Fix umd memory leak in copy_process()
2021-03-19 22:23:19 +01:00
utsname_sysctl.c
…
utsname.c
uts: Use generic ns_common::count
2020-08-19 14:13:20 +02:00
watch_queue.c
watch_queue: rectify kernel-doc for init_watch()
2021-01-26 11:16:34 +00:00
watchdog_hld.c
…
watchdog.c
workqueue/watchdog: Make unbound workqueues aware of touch_softlockup_watchdog()
2021-04-04 13:26:49 -04:00
workqueue_internal.h
…
workqueue.c
CFI on arm64 series for v5.13-rc1
2021-04-27 10:16:46 -07:00