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Oleg Nesterov 00cd5c37af ptrace: permit ptracing of /sbin/init 
Afaics, currently there are no kernel problems with ptracing init, it can't
lose SIGNAL_UNKILLABLE flag and be killed/stopped by accident.

The ability to strace/debug init can be very useful if you try to figure out
why it does not work as expected.

However, admin should know what he does, "gdb /sbin/init 1" stops init, it
can't reap orphaned zombies or take care of /etc/inittab until continued.  It
is even possible to crash init (and thus the whole system) if you wish,
ptracer has full control.

See also the long discussion: http://marc.info/?t=120628018600001

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Roland McGrath <roland@redhat.com>
Acked-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2008-04-30 08:29:38 -07:00
..
irq kernel: explicitly include required header files under kernel/ 2008-04-29 08:06:04 -07:00
power PM/gxfb: add hook to PM console layer that allows disabling of suspend VT switch 2008-04-28 08:58:36 -07:00
time kernel: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
.gitignore
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Kconfig.hz
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Kconfig.preempt
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Makefile sysctl: allow embedded targets to disable sysctl_check.c 2008-04-29 08:06:22 -07:00
acct.c
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audit.c [patch 2/2] Use find_task_by_vpid in audit code 2008-04-28 06:28:30 -04:00
audit.h [PATCH 1/2] audit: move extern declarations to audit.h 2008-04-28 06:28:04 -04:00
audit_tree.c
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auditfilter.c Merge branch 'audit.b50' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current 2008-04-29 11:41:22 -07:00
auditsc.c [PATCH] new predicate - AUDIT_FILETYPE 2008-04-28 06:28:37 -04:00
backtracetest.c
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bounds.c Add kbuild.h that contains common definitions for kbuild users 2008-04-29 08:06:29 -07:00
capability.c
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cgroup.c cgroups: add an owner to the mm_struct 2008-04-29 08:06:10 -07:00
cgroup_debug.c CGroup API files: move "releasable" to cgroup_debug subsystem 2008-04-29 08:06:09 -07:00
compat.c signals: add set_restore_sigmask 2008-04-30 08:29:37 -07:00
configs.c kernel: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
cpu.c simplify cpu_hotplug_begin()/put_online_cpus() 2008-04-29 08:06:11 -07:00
cpuset.c Cpuset hardwall flag: add a mem_hardwall flag to cpusets 2008-04-29 08:06:11 -07:00
delayacct.c
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dma.c kernel: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
exec_domain.c
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exit.c ptrace: introduce ptrace_reparented() helper 2008-04-30 08:29:38 -07:00
extable.c
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fork.c signals: microoptimize the usage of ->curr_target 2008-04-30 08:29:35 -07:00
futex.c
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futex_compat.c
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hrtimer.c hrtimer: raise softirq unlocked to avoid circular lock dependency 2008-04-28 22:22:21 +02:00
itimer.c
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kallsyms.c kernel: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
kexec.c vmcoreinfo: add page flags values 2008-04-28 08:58:23 -07:00
kfifo.c
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kgdb.c
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kmod.c
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kprobes.c kprobes: add (un)register_jprobes for batch registration 2008-04-28 08:58:32 -07:00
ksysfs.c
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kthread.c kthread: call wake_up_process() without the lock being held 2008-04-29 08:06:04 -07:00
latencytop.c kernel: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
lockdep.c
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lockdep_internals.h
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lockdep_proc.c kernel: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
marker.c kernel: explicitly include required header files under kernel/ 2008-04-29 08:06:04 -07:00
module.c
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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 ipc: re-enable msgmni automatic recomputing msgmni if set to negative 2008-04-29 08:06:13 -07:00
ns_cgroup.c cgroups: kernel/ns_cgroup.c should #include <linux/nsproxy.h> 2008-04-29 08:06:07 -07:00
nsproxy.c ipc: sysvsem: refuse clone(CLONE_SYSVSEM|CLONE_NEWIPC) 2008-04-29 08:06:14 -07:00
panic.c Taint kernel after WARN_ON(condition) 2008-04-29 08:05:59 -07:00
params.c
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pid.c
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pid_namespace.c kernel: fix integer as NULL pointer warnings 2008-04-28 17:29:18 -07:00
pm_qos_params.c
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posix-cpu-timers.c
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posix-timers.c signals: join send_sigqueue() with send_group_sigqueue() 2008-04-30 08:29:36 -07:00
printk.c isolate ratelimit from printk.c for other use 2008-04-29 08:06:06 -07:00
profile.c kernel: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
ptrace.c ptrace: permit ptracing of /sbin/init 2008-04-30 08:29:38 -07:00
rcuclassic.c
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rcupdate.c
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rcupreempt.c
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rcupreempt_trace.c
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rcutorture.c kernel: explicitly include required header files under kernel/ 2008-04-29 08:06:04 -07:00
relay.c Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2008-04-29 08:18:03 -07:00
res_counter.c memcgroup: add the max_usage member on the res_counter 2008-04-29 08:06:10 -07:00
resource.c kernel: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
rtmutex-debug.c
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rtmutex-debug.h
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rtmutex-tester.c
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rtmutex.c
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rtmutex.h
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rtmutex_common.h
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rwsem.c
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sched.c CGroups _s64 files: use read_s64/write_s64 in CFS cgroup for rt_runtime file 2008-04-29 08:06:09 -07:00
sched_debug.c kernel: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
sched_fair.c
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sched_features.h
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sched_idletask.c
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sched_rt.c
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sched_stats.h
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seccomp.c
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semaphore.c
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signal.c signals: add set_restore_sigmask 2008-04-30 08:29:37 -07:00
softirq.c
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softlockup.c
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spinlock.c
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srcu.c
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stacktrace.c
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stop_machine.c
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sys.c k_getrusage: don't take rcu_read_lock() 2008-04-30 08:29:34 -07:00
sys_ni.c
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sysctl.c sysctl: add the ->permissions callback on the ctl_table_root 2008-04-29 08:06:23 -07:00
sysctl_check.c
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taskstats.c
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test_kprobes.c
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time.c kernel: explicitly include required header files under kernel/ 2008-04-29 08:06:04 -07:00
timeconst.pl
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timer.c
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tsacct.c
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uid16.c
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user.c keys: don't generate user and user session keyrings unless they're accessed 2008-04-29 08:06:17 -07:00
user_namespace.c eCryptfs: make key module subsystem respect namespaces 2008-04-29 08:06:07 -07:00
utsname.c kernel: explicitly include required header files under kernel/ 2008-04-29 08:06:04 -07:00
utsname_sysctl.c
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wait.c
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workqueue.c cleanup_workqueue_thread: remove the unneeded "cpu" parameter 2008-04-29 08:06:11 -07:00