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Zheng Zucheng 12f98cc6fb sched/cputime: Fix mul_u64_u64_div_u64() precision for cputime 
commit 77baa5bafcbe1b2a15ef9c37232c21279c95481c upstream.

In extreme test scenarios:
the 14th field utime in /proc/xx/stat is greater than sum_exec_runtime,
utime = 18446744073709518790 ns, rtime = 135989749728000 ns

In cputime_adjust() process, stime is greater than rtime due to
mul_u64_u64_div_u64() precision problem.
before call mul_u64_u64_div_u64(),
stime = 175136586720000, rtime = 135989749728000, utime = 1416780000.
after call mul_u64_u64_div_u64(),
stime = 135989949653530

unsigned reversion occurs because rtime is less than stime.
utime = rtime - stime = 135989749728000 - 135989949653530
		      = -199925530
		      = (u64)18446744073709518790

Trigger condition:
  1). User task run in kernel mode most of time
  2). ARM64 architecture
  3). TICK_CPU_ACCOUNTING=y
      CONFIG_VIRT_CPU_ACCOUNTING_NATIVE is not set

Fix mul_u64_u64_div_u64() conversion precision by reset stime to rtime

Fixes: 3dc167ba57 ("sched/cputime: Improve cputime_adjust()")
Signed-off-by: Zheng Zucheng <zhengzucheng@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20240726023235.217771-1-zhengzucheng@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2024-08-14 13:58:47 +02:00
..
bpf bpf: Eliminate remaining "make W=1" warnings in kernel/bpf/btf.o 2024-08-03 08:53:43 +02:00
cgroup cgroup/cpuset: Prevent UAF in proc_cpuset_show() 2024-08-03 08:53:22 +02:00
configs Kbuild updates for v6.6 2023-09-05 11:01:47 -07:00
debug kdb: Use the passed prompt in kdb_position_cursor() 2024-08-03 08:54:34 +02:00
dma dma: fix call order in dmam_free_coherent 2024-08-03 08:54:36 +02:00
entry entry: Respect changes to system call number by trace_sys_enter() 2024-04-03 15:28:50 +02:00
events bpf, events: Use prog to emit ksymbol event for main program 2024-08-03 08:54:36 +02:00
futex futex: Don't include process MM in futex key on no-MMU 2023-11-20 11:58:53 +01:00
gcov gcov: add support for GCC 14 2024-06-27 13:49:13 +02:00
irq irqdomain: Fixed unbalanced fwnode get and put 2024-08-03 08:54:25 +02:00
kcsan kcsan: Don't expect 64 bits atomic builtins from 32 bits architectures 2023-06-09 23:29:50 +10:00
livepatch livepatch: Fix missing newline character in klp_resolve_symbols() 2023-11-20 11:59:25 +01:00
locking locking/rwsem: Add __always_inline annotation to __down_write_common() and inlined callers 2024-08-03 08:53:42 +02:00
module modules: wait do_free_init correctly 2024-03-26 18:19:55 -04:00
power PM: s2idle: Make sure CPUs will wakeup directly on resume 2024-04-17 11:19:26 +02:00
printk printk: For @suppress_panic_printk check for other CPU in panic 2024-04-13 13:07:29 +02:00
rcu rcu: Fix rcu_barrier() VS post CPUHP_TEARDOWN_CPU invocation 2024-08-14 13:58:41 +02:00
sched sched/cputime: Fix mul_u64_u64_div_u64() precision for cputime 2024-08-14 13:58:47 +02:00
time tick/broadcast: Make takeover of broadcast hrtimer reliable 2024-08-03 08:54:12 +02:00
trace trace/pid_list: Change gfp flags in pid_list_fill_irq() 2024-08-03 08:54:17 +02:00
.gitignore
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Kconfig.freezer
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Kconfig.hz
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Kconfig.kexec kexec: select CRYPTO from KEXEC_FILE instead of depending on it 2024-01-05 15:19:41 +01:00
Kconfig.locks
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Kconfig.preempt
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Makefile kernel/numa.c: Move logging out of numa.h 2024-06-12 11:11:50 +02:00
acct.c audit/stable-6.6 PR 20230829 2023-08-30 08:17:35 -07:00
async.c async: Introduce async_schedule_dev_nocall() 2024-01-31 16:18:49 -08:00
audit.c audit: Send netlink ACK before setting connection in auditd_set 2024-02-05 20:14:14 +00:00
audit.h audit: correct audit_filter_inodes() definition 2023-07-21 12:17:25 -04:00
audit_fsnotify.c
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audit_tree.c
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audit_watch.c audit: don't WARN_ON_ONCE(!current->mm) in audit_exe_compare() 2023-11-28 17:19:56 +00:00
auditfilter.c ima: Avoid blocking in RCU read-side critical section 2024-07-11 12:49:18 +02:00
auditsc.c audit,io_uring: io_uring openat triggers audit reference count underflow 2023-10-13 18:34:46 +02:00
backtracetest.c
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bounds.c bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS 2024-05-02 16:32:50 +02:00
capability.c lsm: constify the 'target' parameter in security_capget() 2023-08-08 16:48:47 -04:00
cfi.c
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compat.c
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configs.c
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context_tracking.c locking/atomic: treewide: use raw_atomic*_<op>() 2023-06-05 09:57:20 +02:00
cpu.c cpu: Fix broken cmdline "nosmp" and "maxcpus=0" 2024-07-11 12:49:14 +02:00
cpu_pm.c
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crash_core.c mm: turn folio_test_hugetlb into a PageType 2024-05-02 16:32:47 +02:00
crash_dump.c
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cred.c cred: get rid of CONFIG_DEBUG_CREDENTIALS 2023-12-20 17:01:51 +01:00
delayacct.c delayacct: track delays from IRQ/SOFTIRQ 2023-04-18 16:39:34 -07:00
dma.c
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exec_domain.c
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exit.c mm: optimize the redundant loop of mm_update_owner_next() 2024-07-11 12:49:15 +02:00
extable.c
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fail_function.c
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fork.c Revert "fork: defer linking file vma until vma is fully initialized" 2024-06-21 14:38:47 +02:00
freezer.c
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gen_kheaders.sh kheaders: explicitly define file modes for archived headers 2024-06-21 14:38:40 +02:00
groups.c
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hung_task.c kernel/hung_task.c: set some hung_task.c variables storage-class-specifier to static 2023-04-08 13:45:37 -07:00
iomem.c kernel/iomem.c: remove __weak ioremap_cache helper 2023-08-21 13:37:28 -07:00
irq_work.c
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jump_label.c jump_label: Fix the fix, brown paper bags galore 2024-08-14 13:58:38 +02:00
kallsyms.c kallsyms: Change func signature for cleanup_symbol_name() 2023-08-25 15:00:36 -07:00
kallsyms_internal.h
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kallsyms_selftest.c Modules changes for v6.6-rc1 2023-08-29 17:32:32 -07:00
kallsyms_selftest.h
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kcmp.c
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kcov.c kcov: don't lose track of remote references during softirqs 2024-06-27 13:49:13 +02:00
kexec.c kernel: kexec: copy user-array safely 2023-11-28 17:19:40 +00:00
kexec_core.c kexec: do syscore_shutdown() in kernel_kexec 2024-01-31 16:18:56 -08:00
kexec_elf.c
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kexec_file.c integrity-v6.6 2023-08-30 09:16:56 -07:00
kexec_internal.h
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kheaders.c
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kprobes.c kprobe/ftrace: fix build error due to bad function definition 2024-06-27 13:49:15 +02:00
ksyms_common.c kallsyms: make kallsyms_show_value() as generic function 2023-06-08 12:27:20 -07:00
ksysfs.c crash: hotplug support for kexec_load() 2023-08-24 16:25:14 -07:00
kthread.c kthread: add kthread_stop_put 2024-06-12 11:12:52 +02:00
latencytop.c
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module_signature.c
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notifier.c notifiers: add tracepoints to the notifiers infrastructure 2023-04-08 13:45:38 -07:00
nsproxy.c nsproxy: Convert nsproxy.count to refcount_t 2023-08-21 11:29:12 -07:00
numa.c kernel/numa.c: Move logging out of numa.h 2024-06-12 11:11:50 +02:00
padata.c padata: Disable BH when taking works lock on MT path 2024-06-27 13:49:00 +02:00
panic.c panic: Flush kernel log buffer at the end 2024-04-13 13:07:29 +02:00
params.c kernel: params: Remove unnecessary ‘0’ values from err 2023-07-10 12:47:01 -07:00
pid.c pidfd: prevent a kernel-doc warning 2023-09-19 13:21:33 -07:00
pid_namespace.c zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING 2024-06-21 14:38:50 +02:00
pid_sysctl.h memfd: replace ratcheting feature from vm.memfd_noexec with hierarchy 2023-08-21 13:37:59 -07:00
profile.c profiling: remove profile=sleep support 2024-08-14 13:58:47 +02:00
ptrace.c ptrace: Provide set/get interface for syscall user dispatch 2023-04-16 14:23:07 +02:00
range.c
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reboot.c kernel/reboot: emergency_restart: Set correct system_state 2023-11-28 17:20:04 +00:00
regset.c
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relay.c kernel: relay: remove unnecessary NULL values from relay_open_buf 2023-08-18 10:18:55 -07:00
resource.c kernel/resource: Increment by align value in get_free_mem_region() 2024-01-10 17:16:58 +01:00
resource_kunit.c
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rseq.c
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scftorture.c scftorture: Pause testing after memory-allocation failure 2023-07-14 15:02:57 -07:00
scs.c
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seccomp.c seccomp: Add missing kerndoc notations 2023-08-17 12:32:15 -07:00
signal.c kernel: rerun task_work while freezing in get_signal() 2024-08-03 08:54:13 +02:00
smp.c smp,csd: Throw an error if a CSD lock is stuck for too long 2023-11-28 17:19:36 +00:00
smpboot.c kthread: add kthread_stop_put 2024-06-12 11:12:52 +02:00
smpboot.h
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softirq.c softirq: Fix suspicious RCU usage in __do_softirq() 2024-06-12 11:11:27 +02:00
stackleak.c stackleak: allow to specify arch specific stackleak poison function 2023-04-20 11:36:35 +02:00
stacktrace.c
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static_call.c
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static_call_inline.c
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stop_machine.c
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sys.c prctl: generalize PR_SET_MDWE support check to be per-arch 2024-04-03 15:28:54 +02:00
sys_ni.c syscalls: fix compat_sys_io_pgetevents_time64 usage 2024-07-05 09:34:04 +02:00
sysctl-test.c
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sysctl.c v6.5-rc1-sysctl-next 2023-06-28 16:05:21 -07:00
task_work.c task_work: Introduce task_work_cancel() again 2024-08-03 08:54:16 +02:00
taskstats.c
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torture.c rcutorture: Fix stuttering races and other issues 2023-11-28 17:20:08 +00:00
tracepoint.c
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tsacct.c
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ucount.c sysctl: Add size to register_sysctl 2023-08-15 15:26:17 -07:00
uid16.c
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uid16.h
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umh.c sysctl: fix unused proc_cap_handler() function warning 2023-06-29 15:19:43 -07:00
up.c
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user-return-notifier.c
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user.c
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user_namespace.c
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usermode_driver.c
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utsname.c
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utsname_sysctl.c utsname: simplify one-level sysctl registration for uts_kern_table 2023-04-13 11:49:35 -07:00
vhost_task.c vhost_task: Handle SIGKILL by flushing work and exiting 2024-07-11 12:49:10 +02:00
watch_queue.c kernel: watch_queue: copy user-array safely 2023-11-28 17:19:40 +00:00
watchdog.c watchdog: move softlockup_panic back to early_param 2023-11-28 17:19:57 +00:00
watchdog_buddy.c watchdog/hardlockup: move SMP barriers from common code to buddy code 2023-06-19 16:25:28 -07:00
watchdog_perf.c watchdog/perf: properly initialize the turbo mode timestamp and rearm counter 2024-08-03 08:54:29 +02:00
workqueue.c workqueue: Fix selection of wake_cpu in kick_pool() 2024-05-17 12:02:31 +02:00
workqueue_internal.h workqueue: Drop the special locking rule for worker->flags and worker_pool->flags 2023-08-07 15:57:22 -10:00