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52b3694157
linux/kernel
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Amnon Shiloh 52b3694157 kernel/sys.c: make prctl(PR_SET_MM) generally available 
The purpose of this patch is to allow privileged processes to set
their own per-memory memory-region fields:

      start_code, end_code, start_data, end_data, start_brk, brk,
      start_stack, arg_start, arg_end, env_start, env_end.

This functionality is needed by any application or package that needs to
reconstruct Linux processes, that is, to start them in any way other than
by means of an "execve()" from an executable file.  This includes:

1. Restoring processes from a checkpoint-file (by all potential
   user-level checkpointing packages, not only CRIU's).
2. Restarting processes on another node after process migration.
3. Starting duplicated copies of a running process (for reliability
   and high-availablity).
4. Starting a process from an executable format that is not supported
   by Linux, thus requiring a "manual execve" by a user-level utility.
5. Similarly, starting a process from a networked and/or crypted
   executable that, for confidentiality, licensing or other reasons,
   may not be written to the local file-systems.

The code that does that was already included in the Linux kernel by the
CRIU group, in the form of "prctl(PR_SET_MM)", but prior to this was
enclosed within their private "#ifdef CONFIG_CHECKPOINT_RESTORE", which is
normally disabled.  The patch removes those ifdefs.

Signed-off-by: Amnon Shiloh <u3557@miso.sublimeip.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-04-30 17:04:09 -07:00
..
cpu Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-04-30 08:15:40 -07:00
debug KGDB/KDB fixes and cleanups 2013-03-02 08:31:39 -08:00
events Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-04-30 07:41:01 -07:00
gcov
irq
power
sched workqueue: include workqueue info when printing debug dump of a worker task 2013-04-30 17:04:02 -07:00
time clockevents: Set dummy handler on CPU_DEAD shutdown 2013-04-25 13:57:04 +02:00
trace Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-04-30 07:41:01 -07:00
.gitignore kernel/hz.bc: ignore. 2013-04-22 07:09:06 -07:00
acct.c
async.c async: rename and redefine async_func_ptr 2013-03-12 13:59:14 -07:00
audit_tree.c kernel/audit_tree.c: tree will leak memory when failure occurs in audit_trim_trees() 2013-04-29 15:54:26 -07:00
audit_watch.c
audit.c audit: don't check if kauditd is valid every time 2013-04-29 15:54:26 -07:00
audit.h audit: remove unnecessary #if CONFIG_AUDIT 2013-04-29 15:54:26 -07:00
auditfilter.c kernel/auditfilter.c: tree and watch will memory leak when failure occurs 2013-04-29 15:54:26 -07:00
auditsc.c kernel/auditsc.c: use kzalloc instead of kmalloc+memset 2013-04-29 15:54:26 -07:00
backtracetest.c
bounds.c
capability.c Add file_ns_capable() helper function for open-time capability checking 2013-04-14 10:06:31 -07:00
cgroup_freezer.c
cgroup.c Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-04-30 07:43:28 -07:00
compat.c kernel/compat.c: make do_sysinfo() static 2013-04-30 17:04:03 -07:00
configs.c
context_tracking.c
cpu_pm.c
cpu.c
cpuset.c Merge branch 'for-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 2013-04-29 19:14:20 -07:00
crash_dump.c
cred.c
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c Revert "lockdep: check that no locks held at freeze time" 2013-03-31 11:38:33 -07:00
extable.c extable: Flip the sorting message 2013-04-15 13:25:16 +02:00
fork.c Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-04-30 07:43:28 -07:00
freezer.c
futex_compat.c
futex.c futex: fix kernel-doc notation and spello 2013-03-12 20:42:10 -07:00
groups.c
hrtimer.c Merge branch 'linus' into timers/core 2013-04-24 20:33:54 +02:00
hung_task.c
irq_work.c
itimer.c
jump_label.c
kallsyms.c
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c kexec: Use min() and min_t() to simplify logic 2013-04-30 17:04:07 -07:00
kmod.c kmod: remove call_usermodehelper_fns() 2013-04-30 17:04:06 -07:00
kprobes.c kprobes: Fix a double lock bug of kprobe_mutex 2013-04-18 08:58:38 -07:00
ksysfs.c
kthread.c kthread: implement probe_kthread_data() 2013-04-30 17:04:02 -07:00
latencytop.c
lglock.c
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
lockdep.c lockdep: Consolidate bug messages into a single print_lockdep_off() function 2013-04-26 08:37:22 +02:00
Makefile idle: Provide a generic entry point for the idle code 2013-04-08 17:39:23 +02:00
modsign_certificate.S
modsign_pubkey.c
module_signing.c
module-internal.h
module.c
mutex-debug.c
mutex-debug.h
mutex.c mutex: Back out architecture specific check for negative mutex count 2013-04-19 09:33:36 +02:00
mutex.h
notifier.c
nsproxy.c
padata.c
panic.c dump_stack: implement arch-specific hardware description in task dumps 2013-04-30 17:04:02 -07:00
params.c
pid_namespace.c pid_namespace.c/.h: simplify defines 2013-04-30 17:04:07 -07:00
pid.c pid_namespace.c/.h: simplify defines 2013-04-30 17:04:07 -07:00
posix-cpu-timers.c
posix-timers.c posix-timers: Remove unused variable 2013-04-18 12:51:19 +02:00
printk.c workqueue: include workqueue info when printing debug dump of a worker task 2013-04-30 17:04:02 -07:00
profile.c
ptrace.c ptrace: add ability to retrieve signals without removing from a queue (v4) 2013-04-30 17:04:05 -07:00
range.c kernel/range.c: subtract_range: fix the broken phrase issued by printk 2013-04-30 17:04:01 -07:00
rcu.h
rcupdate.c
rcutiny_plugin.h
rcutiny.c
rcutorture.c
rcutree_plugin.h Merge branches 'doc.2013.03.12a', 'fixes.2013.03.13a' and 'idlenocb.2013.03.26b' into HEAD 2013-03-26 08:07:38 -07:00
rcutree_trace.c rcu: Make RCU_FAST_NO_HZ take advantage of numbered callbacks 2013-03-26 08:04:51 -07:00
rcutree.c Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-04-30 07:39:01 -07:00
rcutree.h Merge branches 'doc.2013.03.12a', 'fixes.2013.03.13a' and 'idlenocb.2013.03.26b' into HEAD 2013-03-26 08:07:38 -07:00
relay.c relay: use macro PAGE_ALIGN instead of FIX_SIZE 2013-04-30 17:04:09 -07:00
res_counter.c
resource.c mem hotunplug: fix kfree() of bootmem memory 2013-04-29 15:54:40 -07:00
rtmutex_common.h
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c locking/rtmutex/tester: Set correct permissions on sysfs files 2013-04-10 14:48:37 +02:00
rtmutex.c
rtmutex.h
rwsem.c
seccomp.c
semaphore.c semaphore: use `bool' type for semaphore_waiter's up 2013-04-30 17:04:08 -07:00
signal.c coredump: only SIGKILL should interrupt the coredumping task 2013-04-30 17:04:06 -07:00
smp.c kernel/smp.c: cleanups 2013-04-30 17:04:03 -07:00
smpboot.c kthread: Prevent unpark race which puts threads on the wrong cpu 2013-04-12 14:18:43 +02:00
smpboot.h
softirq.c kernel/smp.c: remove 'priv' of call_single_data 2013-04-30 17:04:03 -07:00
spinlock.c
srcu.c
stacktrace.c
stop_machine.c
sys_ni.c
sys.c kernel/sys.c: make prctl(PR_SET_MM) generally available 2013-04-30 17:04:09 -07:00
sysctl_binary.c
sysctl.c mm: replace hardcoded 3% with admin_reserve_pages knob 2013-04-29 15:54:36 -07:00
task_work.c
taskstats.c
test_kprobes.c kernel/: rename random32() to prandom_u32() 2013-04-29 18:28:42 -07:00
time.c timekeeping: Use inject_offset in warp_clock 2013-03-15 16:50:20 -07:00
timeconst.bc
timer.c kernel/timer.c: move some non timer related syscalls to kernel/sys.c 2013-04-30 17:04:03 -07:00
tracepoint.c Tracing updates for Linux 3.10 2013-04-29 13:55:38 -07:00
tsacct.c
uid16.c
up.c
user_namespace.c userns: Changing any namespace id mappings should require privileges 2013-04-14 18:11:32 -07:00
user-return-notifier.c
user.c userns: Restrict when proc and sysfs can be mounted 2013-03-27 07:50:08 -07:00
utsname_sysctl.c
utsname.c
wait.c
watchdog.c watchdog: Add comments to explain the watchdog_disabled variable 2013-03-14 08:24:05 +01:00
workqueue_internal.h workqueue: include workqueue info when printing debug dump of a worker task 2013-04-30 17:04:02 -07:00
workqueue.c workqueue: include workqueue info when printing debug dump of a worker task 2013-04-30 17:04:02 -07:00