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Thomas Gleixner 1881e0a3fe timekeeping/vsyscall: Prevent math overflow in BOOTTIME update 
The VDSO update for CLOCK_BOOTTIME has a overflow issue as it shifts the
nanoseconds based boot time offset left by the clocksource shift. That
overflows once the boot time offset becomes large enough. As a consequence
CLOCK_BOOTTIME in the VDSO becomes a random number causing applications to
misbehave.

Fix it by storing a timespec64 representation of the offset when boot time
is adjusted and add that to the MONOTONIC base time value in the vdso data
page. Using the timespec64 representation avoids a 64bit division in the
update code.

Change-Id: I4bee5af4e14ed1bf6c9623f5cb70f1542d7cc700
Fixes: 44f57d788e7d ("timekeeping: Provide a generic update_vsyscall() implementation")
Reported-by: Chris Clayton <chris2553@googlemail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Chris Clayton <chris2553@googlemail.com>
Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1908221257580.1983@nanos.tec.linutronix.de
Git-commit: b99328a60a482108f5195b4d611f90992ca016ba
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Prateek Sood <prsood@codeaurora.org>
2020-11-02 09:42:42 -08:00
..
bpf This is the 4.19.137 stable release 2020-08-05 12:07:48 +02:00
cgroup Merge android-4.19-stable.146 (443485d) into msm-4.19 2020-10-16 11:06:31 +05:30
configs ANDROID: remove android config fragments 2018-08-28 17:15:17 +05:30
debug Merge android-4.19-stable.136 (204dd19) into msm-4.19 2020-10-14 20:04:29 +05:30
dma Merge android-4.19-stable.125 (a483478) into msm-4.19 2020-09-20 23:45:10 +05:30
events Merge android-4.19-stable.136 (204dd19) into msm-4.19 2020-10-14 20:04:29 +05:30
gcov This is the 4.19.146 stable release 2020-09-17 13:59:19 +02:00
irq Merge android-4.19-stable.146 (443485d) into msm-4.19 2020-10-16 11:06:31 +05:30
livepatch livepatch: Nullify obj->mod in klp_module_coming()'s error path 2019-10-07 18:57:10 +02:00
locking Merge android-4.19-stable.146 (443485d) into msm-4.19 2020-10-16 11:06:31 +05:30
power Merge android-4.19-stable.125 (a483478) into msm-4.19 2020-09-20 23:45:10 +05:30
printk Merge android-4.19-stable.136 (204dd19) into msm-4.19 2020-10-14 20:04:29 +05:30
rcu Merge android-4.19.110 (1984fff) into msm-4.19 2020-05-23 05:08:22 -07:00
sched Merge "sched/tune: Fix improper accounting of tasks" 2020-10-19 15:55:56 -07:00
time timekeeping/vsyscall: Prevent math overflow in BOOTTIME update 2020-11-02 09:42:42 -08:00
trace Merge android-4.19-stable.146 (443485d) into msm-4.19 2020-10-16 11:06:31 +05:30
.gitignore BACKPORT: Provide in-kernel headers to make extending kernel easier 2019-06-12 12:33:20 +00:00
acct.c acct_on(): don't mess with freeze protection 2019-05-31 06:46:05 -07:00
async.c
audit.c audit: fix a net reference leak in audit_list_rules_send() 2020-06-22 09:05:13 +02:00
audit.h audit: fix a net reference leak in audit_list_rules_send() 2020-06-22 09:05:13 +02:00
audit_fsnotify.c
audit_tree.c audit: Embed key into chunk 2019-12-13 08:51:11 +01:00
audit_watch.c audit_get_nd(): don't unlock parent too early 2019-12-13 08:51:02 +01:00
auditfilter.c audit: fix a net reference leak in audit_list_rules_send() 2020-06-22 09:05:13 +02:00
auditsc.c audit: print empty EXECVE args 2019-12-01 09:17:17 +01:00
backtracetest.c
bounds.c kbuild: fix kernel/bounds.c 'W=1' warning 2018-11-13 11:08:47 -08:00
capability.c LSM: generalize flag passing to security_capable 2020-01-23 08:21:29 +01:00
cfi.c ANDROID: cfi: fix export symbol types 2020-04-29 19:16:15 +02:00
compat.c make 'user_access_begin()' do 'access_ok()' 2020-06-22 09:04:58 +02:00
configs.c
context_tracking.c
cpu.c Merge android-4.19-stable.136 (204dd19) into msm-4.19 2020-10-14 20:04:29 +05:30
cpu_pm.c Merge android-4.19-stable.136 (204dd19) into msm-4.19 2020-10-14 20:04:29 +05:30
crash_core.c kernel/crash_core.c: print timestamp using time64_t 2018-08-22 10:52:47 -07:00
crash_dump.c
cred.c memcg: account security cred as well to kmemcg 2020-01-09 10:19:00 +01:00
delayacct.c UPSTREAM: delayacct: track delays from thrashing cache pages 2019-03-21 16:25:26 -07:00
dma.c
elfcore.c kernel/elfcore.c: include proper prototypes 2019-10-11 18:21:23 +02:00
exec_domain.c
exit.c Merge android-4.19-stable.136 (204dd19) into msm-4.19 2020-10-14 20:04:29 +05:30
extable.c
fail_function.c
fork.c Merge android-4.19-stable.146 (443485d) into msm-4.19 2020-10-16 11:06:31 +05:30
freezer.c PM / reboot: Eliminate race between reboot and suspend 2018-08-06 12:35:20 +02:00
futex.c futex: Unbreak futex hashing 2020-03-25 08:06:14 +01:00
gen_kheaders.sh kheaders: include only headers into kheaders_data.tar.xz 2020-06-11 05:00:06 -07:00
groups.c
hung_task.c hung task: check specific tasks for long uninterruptible sleep state 2019-08-02 12:42:25 -07:00
iomem.c
irq_work.c irq_work: Do not raise an IPI when queueing work on the local CPU 2019-05-31 06:46:19 -07:00
jump_label.c jump_label: move 'asm goto' support test to Kconfig 2019-06-04 08:02:34 +02:00
kallsyms.c Merge 4.19.133 into android-4.19-stable 2020-07-17 07:54:52 +02:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks locking/rwsem: for rwsem prio aware enhancement 2019-05-24 15:32:11 +08:00
Kconfig.preempt kconfig: include kernel/Kconfig.preempt from init/Kconfig 2018-08-02 08:06:54 +09:00
kcov.c UPSTREAM: kcov: remote coverage support 2020-01-15 14:51:23 +00:00
kexec.c
kexec_core.c kexec: Allocate decrypted control pages for kdump if SME is enabled 2019-11-24 08:20:29 +01:00
kexec_file.c
kexec_internal.h
kheaders.c BACKPORT: kheaders: Move from proc to sysfs 2019-06-12 12:33:54 +00:00
kmod.c kmod: make request_module() return an error when autoloading is disabled 2020-04-17 10:48:52 +02:00
kprobes.c kprobes: Fix NULL pointer dereference at kprobe_ftrace_handler 2020-08-21 11:05:33 +02:00
ksysfs.c
kthread.c This is the 4.19.142 stable release 2020-08-26 11:07:03 +02:00
latencytop.c
Makefile Merge android-4.19.95 (5da1114) into msm-4.19 2020-03-27 10:48:20 -07:00
memremap.c mm/memory_hotplug: shrink zones when offlining memory 2020-01-29 16:43:27 +01:00
module-internal.h
module.c Merge android-4.19-stable.146 (443485d) into msm-4.19 2020-10-16 11:06:31 +05:30
module_signing.c
notifier.c Merge "Merge android-4.19-stable.113 (2b82910d) into msm-4.19" 2020-07-24 22:21:24 -07:00
nsproxy.c
padata.c padata: purge get_cpu and reorder_via_wq from padata_do_serial 2020-05-27 17:37:36 +02:00
panic.c Merge android-4.19-stable.125 (a483478) into msm-4.19 2020-09-20 23:45:10 +05:30
params.c ANDROID: GKI: export symbols from abi_gki_aarch64_qcom_whitelist 2020-04-13 21:36:41 +00:00
pid.c UPSTREAM: pid: add pidfd_open() 2019-08-12 13:36:37 -04:00
pid_namespace.c signal/pid_namespace: Fix reboot_pid_ns to use send_sig not force_sig 2019-07-26 09:14:01 +02:00
profile.c
ptrace.c ptrace: reintroduce usage of subjective credentials in ptrace_has_cap() 2020-01-23 08:21:29 +01:00
range.c
reboot.c UPSTREAM: GKI: panic/reboot: allow specifying reboot_mode for panic only 2020-04-17 05:00:40 +00:00
relay.c kernel/relay.c: fix memleak on destroy relay channel 2020-08-26 10:30:59 +02:00
resource.c resource: fix locking in find_next_iomem_res() 2019-09-16 08:22:20 +02:00
rseq.c
scs.c FROMLIST: scs: add support for stack usage debugging 2019-11-27 12:37:25 -08:00
seccomp.c LSM: generalize flag passing to security_capable 2020-01-23 08:21:29 +01:00
signal.c Merge android-4.19-stable.146 (443485d) into msm-4.19 2020-10-16 11:06:31 +05:30
smp.c smp: Wake up all idle CPUs when suspending to idle 2019-03-15 01:59:15 -07:00
smpboot.c
smpboot.h
softirq.c trace: Add trace points for tasklet entry/exit 2020-01-28 20:45:01 -08:00
stacktrace.c
stop_machine.c Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-08-13 11:25:07 -07:00
sys.c UPSTREAM: arm64: Tighten the PR_{SET, GET}_TAGGED_ADDR_CTRL prctl() unused arguments 2019-10-07 15:27:39 -04:00
sys_ni.c UPSTREAM: signal: support CLONE_PIDFD with pidfd_send_signal 2019-08-12 13:36:37 -04:00
sysctl.c sched/walt: Improve the scheduler 2020-10-06 12:41:10 +05:30
sysctl_binary.c netfilter: nf_defrag_ipv4: Add sysctl to disable per interface 2018-12-03 15:57:38 -08:00
task_work.c
taskstats.c taskstats: extended taskstats2 with acct fields 2020-05-13 22:59:08 -07:00
test_kprobes.c
torture.c
tracepoint.c tracepoint: Fix tracepoint array element size mismatch 2018-10-17 15:35:29 -04:00
tsacct.c
ucount.c
uid16.c
uid16.h
umh.c coredump: fix crash when umh is disabled 2020-05-14 07:57:21 +02:00
up.c
user-return-notifier.c
user.c ANDROID: proc: Add /proc/uid directory 2019-03-06 15:59:21 +00:00
user_namespace.c userns: also map extents in the reverse map to kernel IDs 2018-11-13 11:09:00 -08:00
utsname.c
utsname_sysctl.c sys: don't hold uts_sem while accessing userspace memory 2018-08-11 02:05:53 -05:00
watchdog.c Merge android-4.19.110 (1984fff) into msm-4.19 2020-05-23 05:08:22 -07:00
watchdog_hld.c watchdog: Mark watchdog touch functions as notrace 2018-08-30 12:56:40 +02:00
workqueue.c Merge android-4.19-stable.125 (a483478) into msm-4.19 2020-09-20 23:45:10 +05:30
workqueue_internal.h UPSTREAM: psi: fix aggregation idle shut-off 2019-03-21 16:25:27 -07:00