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android_kernel_xiaomi_sm8450/kernel
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Linus Torvalds 6b3a707736 Merge branch 'page-refs' (page ref overflow) 
Merge page ref overflow branch.

Jann Horn reported that he can overflow the page ref count with
sufficient memory (and a filesystem that is intentionally extremely
slow).

Admittedly it's not exactly easy.  To have more than four billion
references to a page requires a minimum of 32GB of kernel memory just
for the pointers to the pages, much less any metadata to keep track of
those pointers.  Jann needed a total of 140GB of memory and a specially
crafted filesystem that leaves all reads pending (in order to not ever
free the page references and just keep adding more).

Still, we have a fairly straightforward way to limit the two obvious
user-controllable sources of page references: direct-IO like page
references gotten through get_user_pages(), and the splice pipe page
duplication.  So let's just do that.

* branch page-refs:
  fs: prevent page refcount overflow in pipe_buf_get
  mm: prevent get_user_pages() from overflowing page refcount
  mm: add 'try_get_page()' helper function
  mm: make page ref count overflow check tighter and more explicit
2019-04-14 15:09:40 -07:00
..
bpf
xdp: fix cpumap redirect SKB creation bug
2019-03-29 12:15:02 -07:00
cgroup
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2019-03-12 14:08:19 -07:00
configs
kvm_config: add CONFIG_VIRTIO_MENU
2018-10-24 20:55:56 -04:00
debug
kdb: use bool for binary state indicators
2018-12-30 08:31:52 +00:00
dma
dma-debug: only skip one stackframe entry
2019-04-11 19:29:50 +02:00
events
perf/core: Fix perf_event_disable_inatomic() race
2019-04-12 08:55:55 +02:00
gcov
kernel/gcov/gcc_3_4.c: use struct_size() in kzalloc()
2019-03-07 18:32:02 -08:00
irq
genirq: Respect IRQCHIP_SKIP_SET_WAKE in irq_chip_set_wake_parent()
2019-04-05 17:41:41 +02:00
livepatch
Merge branch 'for-5.1/atomic-replace' into for-linus
2019-03-05 15:56:59 +01:00
locking
locking/lockdep: Zap lock classes even with lock debugging disabled
2019-04-10 13:45:59 +02:00
power
treewide: add checks for the return value of memblock_alloc*()
2019-03-12 10:04:02 -07:00
printk
Merge tag 'fbdev-v5.1' of git://github.com/bzolnier/linux
2019-03-15 14:22:59 -07:00
rcu
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2019-03-06 07:59:36 -08:00
sched
sched/fair: Do not re-read ->h_load_next during hierarchical load calculation
2019-04-03 09:50:22 +02:00
time
alarmtimer: Return correct remaining time
2019-04-10 15:23:26 +02:00
trace
Merge branch 'page-refs' (page ref overflow)
2019-04-14 15:09:40 -07:00
.gitignore
kernel/configs: use .incbin directive to embed config_data.gz
2019-03-07 18:32:02 -08:00
acct.c
kernel/acct.c: fix the acct->needcheck check in check_free_space()
2018-01-04 16:45:09 -08:00
async.c
async: Add support for queueing on specific NUMA node
2019-01-31 14:20:54 +01:00
audit_fsnotify.c
audit: add syscall information to CONFIG_CHANGE records
2019-01-18 17:53:29 -05:00
audit_tree.c
audit: hand taken context to audit_kill_trees for syscall logging
2019-01-14 18:01:05 -05:00
audit_watch.c
audit: add syscall information to CONFIG_CHANGE records
2019-01-18 17:53:29 -05:00
audit.c
audit: remove audit_context when CONFIG_ AUDIT and not AUDITSYSCALL
2019-02-03 17:49:35 -05:00
audit.h
audit: hide auditsc_get_stamp and audit_serial prototypes
2019-02-07 21:44:27 -05:00
auditfilter.c
audit: mark expected switch fall-through
2019-02-12 20:17:13 -05:00
auditsc.c
audit: remove audit_context when CONFIG_ AUDIT and not AUDITSYSCALL
2019-02-03 17:49:35 -05:00
backtracetest.c
kernel/backtracetest.c: replace no level printk by pr_info()
2014-06-04 16:54:14 -07:00
bounds.c
kbuild: fix kernel/bounds.c 'W=1' warning
2018-10-31 08:54:14 -07:00
capability.c
LSM: add SafeSetID module that gates setid calls
2019-01-25 11:22:43 -08:00
compat.c
time: make adjtime compat handling available for 32 bit
2019-02-07 00:13:27 +01:00
configs.c
kernel/configs: use .incbin directive to embed config_data.gz
2019-03-07 18:32:02 -08:00
context_tracking.c
context_tracking: Switch to new static_branch API
2015-11-24 09:56:43 +01:00
cpu_pm.c
PM / CPU: replace raw_notifier with atomic_notifier
2017-07-31 13:09:49 +02:00
cpu.c
cpu/hotplug: Prevent crash when CPU bringup fails on CONFIG_HOTPLUG_CPU=n
2019-03-28 13:34:58 +01:00
crash_core.c
kexec: export PG_offline to VMCOREINFO
2019-03-05 21:07:14 -08:00
crash_dump.c
crash_dump: Make is_kdump_kernel() accessible from modules
2014-08-25 15:42:19 -07:00
cred.c
SELinux: Remove cred security blob poisoning
2019-01-08 13:18:44 -08:00
delayacct.c
delayacct: track delays from thrashing cache pages
2018-10-26 16:26:32 -07:00
dma.c
proc: introduce proc_create_single{,_data}
2018-05-16 07:23:35 +02:00
elfcore.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
exec_domain.c
proc: introduce proc_create_single{,_data}
2018-05-16 07:23:35 +02:00
exit.c
Merge branch 'for-5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
2019-03-07 10:11:41 -08:00
extable.c
extable: Make init_kernel_text() global
2018-02-21 16:54:06 +01:00
fail_function.c
kernel/fail_function.c: remove meaningless null pointer check before debugfs_remove_recursive
2018-10-31 08:54:12 -07:00
fork.c
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
2019-03-09 15:53:03 -08:00
freezer.c
PM / reboot: Eliminate race between reboot and suspend
2018-08-06 12:35:20 +02:00
futex.c
futex: Ensure that futex address is aligned in handle_futex_death()
2019-03-22 13:05:26 +01:00
groups.c
kernel: make groups_sort calling a responsibility group_info allocators
2017-12-14 16:00:49 -08:00
hung_task.c
kernel/hung_task.c: Use continuously blocked time when reporting.
2019-03-07 18:31:59 -08:00
iomem.c
memremap: split devm_memremap_pages() and memremap() infrastructure
2018-05-15 23:08:33 -07:00
irq_work.c
irq/work: Improve the flag definitions
2018-01-08 19:43:15 +01:00
jump_label.c
jump_label: move 'asm goto' support test to Kconfig
2019-01-06 09:46:51 +09:00
kallsyms.c
bpf: Add module name [bpf] to ksymbols for bpf programs
2019-01-21 17:38:56 -03:00
kcmp.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
Kconfig.freezer
container freezer: implement freezer cgroup subsystem
2008-10-20 08:52:34 -07:00
Kconfig.hz
…
Kconfig.locks
bpf: introduce bpf_spin_lock
2019-02-01 20:55:38 +01:00
Kconfig.preempt
kconfig: warn no new line at end of file
2018-12-15 17:44:35 +09:00
kcov.c
kcov: convert kcov.refcount to refcount_t
2019-03-07 18:32:02 -08:00
kexec_core.c
mm: convert totalram_pages and totalhigh_pages variables to atomic
2018-12-28 12:11:47 -08:00
kexec_file.c
kexec_file: kexec_walk_memblock() only walks a dedicated region at kdump
2018-12-06 14:38:50 +00:00
kexec_internal.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
kexec.c
kexec: add call to LSM hook in original kexec_load syscall
2018-07-16 12:31:57 -07:00
kmod.c
kmod: move #ifdef CONFIG_MODULES wrapper to Makefile
2017-09-08 18:26:51 -07:00
kprobes.c
kprobes: Search non-suffixed symbol in blacklist
2019-02-13 08:16:40 +01:00
ksysfs.c
kexec: move vmcoreinfo out of the kernel's .bss section
2017-07-12 16:25:59 -07:00
kthread.c
Merge branch 'akpm' (patches from Andrew)
2019-03-06 10:31:36 -08:00
latencytop.c
sched/headers: Prepare to move sched_info_on() and force_schedstat_enabled() from <linux/sched.h> to <linux/sched/stat.h>
2017-03-02 08:42:39 +01:00
Makefile
kernel/configs: use .incbin directive to embed config_data.gz
2019-03-07 18:32:02 -08:00
memremap.c
mm/hmm: fix memremap.h, move dev_page_fault_t callback to hmm
2018-12-28 12:11:52 -08:00
module_signing.c
modsign: use all trusted keys to verify module signature
2018-11-07 14:41:41 +01:00
module-internal.h
modsign: log module name in the event of an error
2018-07-02 11:36:17 +02:00
module.c
dynamic_debug: add static inline stub for ddebug_add_module
2019-03-07 18:32:00 -08:00
notifier.c
kernel/notifier.c: simplify expression
2017-02-24 17:46:56 -08:00
nsproxy.c
perf: Add PERF_RECORD_NAMESPACES to include namespaces related info
2017-03-13 15:57:41 -03:00
padata.c
padata: clean an indentation issue, remove extraneous space
2018-11-16 14:11:04 +08:00
panic.c
kernel/panic.c: taint: fix debugfs_simple_attr.cocci warnings
2019-03-07 18:31:59 -08:00
params.c
kernel/params.c: downgrade warning for unsafe parameters
2018-04-11 10:28:37 -07:00
pid_namespace.c
signal: Use group_send_sig_info to kill all processes in a pid namespace
2018-09-16 16:08:25 +02:00
pid.c
Fix failure path in alloc_pid()
2018-12-28 12:42:30 -08:00
profile.c
mm: remove include/linux/bootmem.h
2018-10-31 08:54:16 -07:00
ptrace.c
ptrace: take into account saved_sigmask in PTRACE{GET,SET}SIGMASK
2019-03-29 10:01:37 -07:00
range.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
reboot.c
kernel/reboot.c: export pm_power_off_prepare
2018-09-11 16:13:24 +01:00
relay.c
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2019-03-12 13:27:20 -07:00
resource.c
Merge tag 'devdax-for-5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
2019-03-16 13:05:32 -07:00
rseq.c
Remove 'type' argument from access_ok() function
2019-01-03 18:57:57 -08:00
seccomp.c
syscalls: Remove start and number from syscall_get_arguments() args
2019-04-05 09:26:43 -04:00
signal.c
signal: don't silently convert SI_USER signals to non-current pidfd
2019-04-01 23:03:18 +02:00
smp.c
cpu/hotplug: Fix "SMT disabled by BIOS" detection for KVM
2019-01-30 19:27:00 +01:00
smpboot.c
smpboot: Remove cpumask from the API
2018-07-03 09:20:44 +02:00
smpboot.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
softirq.c
softirq: Don't skip softirq execution when softirq thread is parking
2019-02-10 21:51:39 +01:00
stackleak.c
stackleak: Mark stackleak_track_stack() as notrace
2018-12-05 19:31:44 -08:00
stacktrace.c
stacktrace/x86: add function for detecting reliable stack traces
2017-03-08 09:18:02 +01:00
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_ni.c
Merge tag 'pidfd-v5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux
2019-03-16 13:47:14 -07:00
sys.c
Merge branch 'akpm' (patches from Andrew)
2019-03-07 19:25:37 -08:00
sysctl_binary.c
kernel/sysctl: add panic_print into sysctl
2019-01-04 13:13:47 -08:00
sysctl.c
kernel/sysctl.c: fix out-of-bounds access when setting file-max
2019-04-05 16:02:31 -10:00
task_work.c
Merge branch 'linus' into locking/core, to resolve conflicts
2017-11-07 10:32:44 +01:00
taskstats.c
pids: introduce find_get_task_by_vpid() helper
2018-02-06 18:32:46 -08:00
test_kprobes.c
kprobes: Remove jprobe API implementation
2018-06-21 12:33:05 +02:00
torture.c
Merge branches 'doc.2019.01.26a', 'fixes.2019.01.26a', 'sil.2019.01.26a', 'spdx.2019.02.09a', 'srcu.2019.01.26a' and 'torture.2019.01.26a' into HEAD
2019-02-09 08:47:52 -08:00
tracepoint.c
tracing: Replace synchronize_sched() and call_rcu_sched()
2018-11-27 09:21:41 -08:00
tsacct.c
sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>
2017-03-02 08:42:39 +01:00
ucount.c
headers: untangle kmemleak.h from mm.h
2018-04-05 21:36:27 -07:00
uid16.c
fs: add do_fchownat(), ksys_fchown() helpers and ksys_{,l}chown() wrappers
2018-04-02 20:15:59 +02:00
uid16.h
kernel: provide ksys_*() wrappers for syscalls called by kernel/uid16.c
2018-04-02 20:15:30 +02:00
umh.c
umh: add exit routine for UMH process
2019-01-11 18:05:40 -08:00
up.c
smp,cpumask: introduce on_each_cpu_cond_mask
2018-10-09 16:51:11 +02:00
user_namespace.c
userns: also map extents in the reverse map to kernel IDs
2018-11-07 23:51:16 -06:00
user-return-notifier.c
scheduler: Replace __get_cpu_var with this_cpu_ptr
2014-08-26 13:45:45 -04:00
user.c
userns: use irqsave variant of refcount_dec_and_lock()
2018-08-22 10:52:47 -07:00
utsname_sysctl.c
sys: don't hold uts_sem while accessing userspace memory
2018-08-11 02:05:53 -05:00
utsname.c
uts: create "struct uts_namespace" from kmem_cache
2018-04-11 10:28:35 -07:00
watchdog_hld.c
watchdog: Mark watchdog touch functions as notrace
2018-08-30 12:56:40 +02:00
watchdog.c
watchdog: Respect watchdog cpumask on CPU hotplug
2019-03-28 13:32:01 +01:00
workqueue_internal.h
psi: fix aggregation idle shut-off
2019-02-01 15:46:23 -08:00
workqueue.c
workqueue: Only unregister a registered lockdep key
2019-03-21 12:00:18 +01:00