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David Herrmann f47542dcc6 shm: add memfd_create() syscall 
memfd_create() is similar to mmap(MAP_ANON), but returns a file-descriptor
that you can pass to mmap().  It can support sealing and avoids any
connection to user-visible mount-points.  Thus, it's not subject to quotas
on mounted file-systems, but can be used like malloc()'ed memory, but with
a file-descriptor to it.

memfd_create() returns the raw shmem file, so calls like ftruncate() can
be used to modify the underlying inode.  Also calls like fstat() will
return proper information and mark the file as regular file.  If you want
sealing, you can specify MFD_ALLOW_SEALING.  Otherwise, sealing is not
supported (like on all other regular files).

Compared to O_TMPFILE, it does not require a tmpfs mount-point and is not
subject to a filesystem size limit.  It is still properly accounted to
memcg limits, though, and to the same overcommit or no-overcommit
accounting as all user memory.

Change-Id: Iaf959293e2c490523aeb46d56cc45b0e7bbe7bf5
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Ryan Lortie <desrt@desrt.ca>
Cc: Lennart Poettering <lennart@poettering.net>
Cc: Daniel Mack <zonque@gmail.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Angelo G. Del Regno <kholk11@gmail.com>
 		2020-03-01 11:35:55 +01:00
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debug Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
events perf/core: Fix concurrent sys_perf_event_open() vs. 'move_group' race 2018-01-13 17:13:44 +03:00
gcov
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irq Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
power Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
sched Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
time sched_clock: Squashed revert of the latest updates 2018-02-20 21:56:17 +03:00
trace Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
.gitignore kernel/hz.bc: ignore. 2016-10-29 23:12:15 +08:00
Kconfig.freezer
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Kconfig.hz
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Kconfig.locks locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage 2012-03-23 13:18:57 +01:00
Kconfig.preempt locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage 2012-03-23 13:18:57 +01:00
Makefile hotplug: Fix UP bug in smpboot hotplug code 2016-10-29 23:12:39 +08:00
acct.c vfs: make path_openat take a struct filename pointer 2018-12-07 22:28:48 +04:00
async.c Fix a dead loop in async_synchronize_full() 2012-10-02 10:30:35 -07:00
audit.c fs: add link restriction audit reporting 2018-12-07 22:28:48 +04:00
audit.h
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audit_tree.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
audit_watch.c get rid of kern_path_parent() 2017-09-22 19:11:54 +03:00
auditfilter.c
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auditsc.c vfs: define struct filename and have getname() return it 2018-12-07 22:28:48 +04:00
backtracetest.c
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bounds.c
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capability.c
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cgroup.c stop passing nameidata to ->lookup() 2018-12-07 22:26:28 +04:00
cgroup_freezer.c cgroup: cgroup_subsys->fork() should be called after the task is added to css_set 2014-03-11 16:10:03 -07:00
compat.c compat: Fix RT signal mask corruption via sigprocmask 2012-05-10 08:58:33 -07:00
configs.c
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cpu.c CPU hotplug: Provide lockless versions of callback registration functions 2018-01-01 21:26:45 +03:00
cpu_pm.c
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cpuset.c cpuset: PF_SPREAD_PAGE and PF_SPREAD_SLAB should be atomic flags 2014-12-01 18:02:38 +08:00
crash_dump.c
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cred.c cred: copy_process() should clear child->replacement_session_keyring 2012-04-11 08:20:11 -07:00
delayacct.c
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dma.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
elfcore.c
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exec_domain.c ANDROID: exec_domains: Disable request_module() call for personalities 2017-12-27 22:46:26 +03:00
exit.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
extable.c
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fork.c seccomp: Replace BUG(!spin_is_locked()) with assert_spin_lock 2017-12-27 22:42:09 +03:00
freezer.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
futex.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
futex_compat.c futex: Revert "futex: Mark get_robust_list as deprecated" 2013-02-28 06:59:01 -08:00
groups.c
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hrtimer.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
hung_task.c
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irq_work.c irq_work: fix compile failure on tile from missing include 2012-04-13 13:15:16 -04:00
itimer.c itimer: Use printk_once instead of WARN_ONCE 2012-04-10 11:00:30 +02:00
jump_label.c
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kallsyms.c vsprintf: Fix %ps on non symbols when using kallsyms 2013-02-08 15:14:22 -08:00
kexec.c Merge branch 'akpm' (Andrew's patch-bomb) 2012-03-28 17:19:28 -07:00
kfifo.c
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kmod.c usermodehelper: check subprocess_info->path != NULL 2013-05-19 10:54:50 -07:00
kprobes.c
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ksysfs.c rcu: Add a module parameter to force use of expedited RCU primitives 2016-10-29 23:12:17 +08:00
kthread.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
latencytop.c
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lglock.c brlocks/lglocks: turn into functions 2015-07-13 11:17:40 -07:00
lockdep.c lockdep: remove task argument from debug_check_no_locks_held 2013-07-12 14:22:56 -07:00
lockdep_internals.h
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lockdep_proc.c
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lockdep_states.h
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module.c module: Fix locking in symbol_put_addr() 2016-04-27 18:55:19 +08:00
mutex-debug.c
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mutex-debug.h
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mutex.c
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mutex.h
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notifier.c
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nsproxy.c userns: make each net (net_ns) belong to a user_ns 2017-09-01 13:38:07 +03:00
padata.c padata: Fix cpu hotplug 2012-03-29 19:52:46 +08:00
panic.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
params.c params: <level>_initcall-like kernel parameters 2012-03-26 12:50:51 +10:30
pid.c BACKPORT: FROMLIST: pids: make task_tgid_nr_ns() safe 2018-01-13 17:13:41 +03:00
pid_namespace.c proc: Usable inode numbers for the namespace file descriptors. 2015-07-13 11:18:01 -07:00
posix-cpu-timers.c posix-cpu-timers: Fix nanosleep task_struct leak 2013-02-28 06:58:59 -08:00
posix-timers.c posix-timers: Fix stack info leak in timer_create() 2015-02-02 17:05:05 +08:00
printk.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
profile.c
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ptrace.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
range.c
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rcu.h rcu: Add a module parameter to force use of expedited RCU primitives 2016-10-29 23:12:17 +08:00
rcupdate.c rcu: Make exit_rcu() more precise and consolidate 2016-10-29 23:12:17 +08:00
rcutiny.c rcu: Correctly handle non-empty Tiny RCU callback list with none ready 2015-10-22 09:20:02 +08:00
rcutiny_plugin.h rcu: Make exit_rcu() more precise and consolidate 2016-10-29 23:12:17 +08:00
rcutorture.c
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rcutree.c rcu: Use smp_hotplug_thread facility for RCUs per-CPU kthread 2016-10-29 23:12:39 +08:00
rcutree.h rcu: Use smp_hotplug_thread facility for RCUs per-CPU kthread 2016-10-29 23:12:39 +08:00
rcutree_plugin.h rcu: Use smp_hotplug_thread facility for RCUs per-CPU kthread 2016-10-29 23:12:39 +08:00
rcutree_trace.c rcu: Use smp_hotplug_thread facility for RCUs per-CPU kthread 2016-10-29 23:12:39 +08:00
relay.c splice: fix racy pipe->buffers uses 2012-07-16 09:04:42 -07:00
res_counter.c
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resource.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
rtmutex-debug.c
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rtmutex-debug.h rtmutex: Handle deadlock detection smarter 2014-07-17 15:39:50 -07:00
rtmutex-tester.c
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rtmutex.c rtmutex: Plug slow unlock race 2014-07-17 15:39:50 -07:00
rtmutex.h rtmutex: Handle deadlock detection smarter 2014-07-17 15:39:50 -07:00
rtmutex_common.h
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rwsem.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
seccomp.c seccomp: Replace BUG(!spin_is_locked()) with assert_spin_lock 2017-12-27 22:42:09 +03:00
semaphore.c
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signal.c BACKPORT: signal: allow to send any siginfo to itself 2017-12-27 22:49:08 +03:00
smp.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
smpboot.c smpboot: use kmemleak_not_leak for smpboot_thread_data 2016-10-29 23:12:40 +08:00
smpboot.h smpboot: Provide infrastructure for percpu hotplug threads 2016-10-29 23:12:39 +08:00
softirq.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
spinlock.c locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage 2012-03-23 13:18:57 +01:00
srcu.c
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stacktrace.c
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stop_machine.c stop_machine: Mark per cpu stopper enabled early 2016-10-29 23:12:39 +08:00
sys.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
sys_ni.c shm: add memfd_create() syscall 2020-03-01 11:35:55 +01:00
sysctl.c fs: add link restrictions 2018-12-07 22:28:48 +04:00
sysctl_binary.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
taskstats.c
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test_kprobes.c
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time.c jiffies: Fix timeval conversion to jiffies 2016-10-29 23:12:15 +08:00
timeconst.bc kernel: Replace timeconst.pl with a bc script 2016-10-29 23:12:15 +08:00
timer.c tick: Upstream fixes 2017-08-25 20:00:22 +03:00
tracepoint.c tracepoint: Do not waste memory on mods with no tracepoints 2014-05-18 05:25:56 -07:00
tsacct.c
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uid16.c
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up.c
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user-return-notifier.c
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user.c proc: Usable inode numbers for the namespace file descriptors. 2015-07-13 11:18:01 -07:00
user_namespace.c proc: Usable inode numbers for the namespace file descriptors. 2015-07-13 11:18:01 -07:00
utsname.c proc: Usable inode numbers for the namespace file descriptors. 2015-07-13 11:18:01 -07:00
utsname_sysctl.c
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wait.c
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watchdog.c kernel/watchdog.c: touch_nmi_watchdog should only touch local cpu not every one 2016-03-21 09:17:57 +08:00
workqueue.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
workqueue_sched.h
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