Oleg Nesterov be95f1308f kernel/signal.c: protect the traced SIGNAL_UNKILLABLE tasks from SIGKILL ...

commit 628c1bcba204052d19b686b5bac149a644cdb72e upstream.

The comment in sig_ignored() says "Tracers may want to know about even
ignored signals" but SIGKILL can not be reported to debugger and it is
just wrong to return 0 in this case: SIGKILL should only kill the
SIGNAL_UNKILLABLE task if it comes from the parent ns.

Change sig_ignored() to ignore ->ptrace if sig == SIGKILL and rely on
sig_task_ignored().

SISGTOP coming from within the namespace is not really right too but at
least debugger can intercept it, and we can't drop it here because this
will break "gdb -p 1": ptrace_attach() won't work.  Perhaps we will add
another ->ptrace check later, we will see.

Link: http://lkml.kernel.org/r/20171103184206.GB21036@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Tested-by: Kyle Huey <me@kylehuey.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2018-01-10 09:27:10 +01:00

..

bpf

bpf: don't let ldimm64 leak map addresses on unprivileged

2017-11-21 09:21:17 +01:00

configs

kconfig: tinyconfig: provide whole choice blocks to avoid warnings

2016-09-24 10:07:42 +02:00

debug

kdb: Fix handling of kallsyms_symbol_next() return value

2017-12-16 10:33:49 +01:00

events

bpf: one perf event close won't free bpf program attached by another perf event

2017-10-21 17:09:02 +02:00

gcov

gcov: support GCC 7.1

2017-09-02 07:06:51 +02:00

irq

genirq: Release resources in __setup_irq() error path

2017-06-26 07:13:10 +02:00

livepatch

livepatch: x86: fix relocation computation with kASLR

2015-11-11 17:36:04 +01:00

locking

locking/lockdep: Add nest_lock integrity test

2017-10-21 17:09:03 +02:00

power

sched/cpuset/pm: Fix cpuset vs. suspend-resume bugs

2017-10-12 11:27:35 +02:00

printk

printk: use rcuidle console tracepoint

2017-02-23 17:43:10 +01:00

rcu

rcu: Allow for page faults in NMI handlers

2017-10-18 09:20:41 +02:00

sched

sched/core: Idle_task_exit() shouldn't use switch_mm_irqs_off()

2017-12-25 14:22:09 +01:00

time

nohz: Prevent a timer interrupt storm in tick_nohz_stop_sched_tick()

2018-01-02 20:33:28 +01:00

trace

ring-buffer: Mask out the info bits when returning buffer page length

2018-01-02 20:33:22 +01:00

.gitignore

…

acct.c

kernel/acct.c: fix the acct->needcheck check in check_free_space()

2018-01-10 09:27:08 +01:00

async.c

…

audit_fsnotify.c

…

audit_tree.c

audit: audit_tree_match can be boolean

2015-11-04 08:23:51 -05:00

audit_watch.c

audit: Fix use after free in audit_remove_watch_rule()

2017-08-24 17:02:35 -07:00

audit.c

audit: ensure that 'audit=1' actually enables audit for PID 1

2017-12-16 10:33:56 +01:00

audit.h

audit: audit_tree_match can be boolean

2015-11-04 08:23:51 -05:00

auditfilter.c

audit: fix comment block whitespace

2015-11-04 08:23:51 -05:00

auditsc.c

audit: fix a double fetch in audit_log_single_execve_arg()

2016-08-20 18:09:22 +02:00

backtracetest.c

…

bounds.c

…

capability.c

exec: Ensure mm->user_ns contains the execed files

2017-01-06 11:16:14 +01:00

cgroup_freezer.c

cgroup: fix handling of multi-destination migration from subtree_control enabling

2015-12-03 10:18:21 -05:00

cgroup_pids.c

cgroup_pids: don't account for the root cgroup

2015-12-03 10:18:21 -05:00

cgroup.c

cgroup, kthread: close race window where new kthreads can be migrated to non-root cgroups

2017-04-21 09:30:04 +02:00

compat.c

…

configs.c

…

context_tracking.c

context_tracking: avoid irq_save/irq_restore on guest entry and exit

2015-11-10 12:06:23 +01:00

cpu_pm.c

…

cpu.c

stable-fixup: hotplug: fix unused function warning

2017-01-12 11:22:48 +01:00

cpuset.c

sched/cpuset/pm: Fix cpuset vs. suspend-resume bugs

2017-10-12 11:27:35 +02:00

crash_dump.c

…

cred.c

cred: Reject inodes with invalid ids in set_create_file_as()

2016-09-15 08:27:49 +02:00

delayacct.c

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dma.c

…

elfcore.c

…

exec_domain.c

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exit.c

wait/ptrace: assume __WALL if the child is traced

2016-06-07 18:14:35 -07:00

extable.c

kernel/extable.c: mark core_kernel_text notrace

2017-07-21 07:44:56 +02:00

fork.c

kaiser: stack map PAGE_SIZE at THREAD_SIZE-PAGE_SIZE

2018-01-05 15:44:23 +01:00

freezer.c

…

futex_compat.c

ptrace: use fsuid, fsgid, effective creds for fs access checks

2016-02-25 12:01:16 -08:00

futex.c

futex: Add missing error handling to FUTEX_REQUEUE_PI

2017-03-22 12:04:19 +01:00

groups.c

kernel: make groups_sort calling a responsibility group_info allocators

2018-01-10 09:27:10 +01:00

hung_task.c

…

irq_work.c

treewide: Remove old email address

2015-11-23 09:44:58 +01:00

jump_label.c

jump_label: Invoke jump_label_test() via early_initcall()

2017-12-16 10:33:55 +01:00

kallsyms.c

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kcmp.c

ptrace: use fsuid, fsgid, effective creds for fs access checks

2016-02-25 12:01:16 -08:00

Kconfig.freezer

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Kconfig.hz

…

Kconfig.locks

…

Kconfig.preempt

…

kexec_core.c

kexec: use file name as the output message prefix

2015-11-06 17:50:42 -08:00

kexec_file.c

kexec: fix double-free when failing to relocate the purgatory

2016-09-24 10:07:36 +02:00

kexec_internal.h

…

kexec.c

kexec: use file name as the output message prefix

2015-11-06 17:50:42 -08:00

kmod.c

…

kprobes.c

tracing/kprobes: Enforce kprobes teardown after testing

2017-05-25 14:30:17 +02:00

ksysfs.c

…

kthread.c

cgroup, kthread: close race window where new kthreads can be migrated to non-root cgroups

2017-04-21 09:30:04 +02:00

latencytop.c

…

Makefile

…

membarrier.c

Fix: Disable sys_membarrier when nohz_full is enabled

2017-03-12 06:37:26 +01:00

memremap.c

mm: fix devm_memremap_pages crash, use mem_hotplug_{begin, done}

2017-01-19 20:17:18 +01:00

module_signing.c

…

module-internal.h

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module.c

module: Invalidate signatures on force-loaded modules

2016-08-20 18:09:27 +02:00

notifier.c

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nsproxy.c

…

padata.c

padata: free correct variable

2017-05-20 14:27:02 +02:00

panic.c

kernel/panic.c: add missing \n

2017-07-05 14:37:19 +02:00

params.c

Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

2015-11-09 15:53:39 -08:00

pid_namespace.c

pid_ns: Sleep in TASK_INTERRUPTIBLE in zap_pid_ns_processes

2017-05-25 14:30:11 +02:00

pid.c

pids: make task_tgid_nr_ns() safe

2017-08-24 17:02:36 -07:00

profile.c

…

ptrace.c

ptrace: Properly initialize ptracer_cred on fork

2017-06-14 13:16:20 +02:00

range.c

…

reboot.c

…

relay.c

…

resource.c

/proc/iomem: only expose physical resource addresses to privileged users

2017-08-06 19:19:42 -07:00

seccomp.c

seccomp: fix the usage of get/put_seccomp_filter() in seccomp_get_filter()

2017-10-05 09:41:46 +02:00

signal.c

kernel/signal.c: protect the traced SIGNAL_UNKILLABLE tasks from SIGKILL

2018-01-10 09:27:10 +01:00

smp.c

mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd

2015-11-06 17:50:42 -08:00

smpboot.c

…

smpboot.h

…

softirq.c

…

stacktrace.c

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stop_machine.c

kernel: remove stop_machine() Kconfig dependency

2015-12-12 10:15:34 -08:00

sys_ni.c

mm: mlock: add new mlock system call

2015-11-05 19:34:48 -08:00

sys.c

prctl: take mmap sem for writing to protect against others

2016-02-25 12:01:25 -08:00

sysctl_binary.c

fs/coredump: prevent fsuid=0 dumps into user-controlled directories

2016-04-12 09:08:58 -07:00

sysctl.c

timer/sysclt: Restrict timer migration sysctl values to 0 and 1

2017-10-05 09:41:47 +02:00

task_work.c

…

taskstats.c

…

test_kprobes.c

…

torture.c

…

tracepoint.c

…

tsacct.c

…

uid16.c

kernel: make groups_sort calling a responsibility group_info allocators

2018-01-10 09:27:10 +01:00

up.c

…

user_namespace.c

…

user-return-notifier.c

…

user.c

…

utsname_sysctl.c

…

utsname.c

…

watchdog.c

kernel/watchdog: use nmi registers snapshot in hardlockup handler

2017-01-06 11:16:16 +01:00

workqueue_internal.h

workqueue: Fix NULL pointer dereference

2017-11-15 17:13:11 +01:00

workqueue.c

workqueue: trigger WARN if queue_delayed_work() is called with NULL @wq

2017-12-16 10:33:52 +01:00