Jann Horn 55463c60b7 sys: don't hold uts_sem while accessing userspace memory ...

commit 42a0cc3478 upstream.

Holding uts_sem as a writer while accessing userspace memory allows a
namespace admin to stall all processes that attempt to take uts_sem.
Instead, move data through stack buffers and don't access userspace memory
while uts_sem is held.

Cc: stable@vger.kernel.org
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2018-09-09 20:01:24 +02:00

..

bpf

bpf: fix references to free_bpf_prog_info() in comments

2018-08-03 07:55:23 +02:00

configs

config: android: enable CONFIG_SECCOMP

2016-10-11 15:06:32 -07:00

debug

kdb: make "mdr" command repeat

2018-05-30 07:50:51 +02:00

events

perf/core: Fix perf_output_read_group()

2018-05-30 07:50:46 +02:00

gcov

gcov: support GCC 7.1

2017-09-02 07:07:53 +02:00

irq

genirq: Make force irq threading setup more robust

2018-08-09 12:17:57 +02:00

livepatch

livepatch/module: make TAINT_LIVEPATCH module-specific

2016-08-26 14:42:08 +02:00

locking

locking/lockdep: Do not record IRQ state within lockdep code

2018-08-24 13:12:31 +02:00

power

PM / sleep: wakeup: Fix build error caused by missing SRCU support

2018-09-09 20:01:23 +02:00

printk

printk: fix possible reuse of va_list variable

2018-07-03 11:23:10 +02:00

rcu

rcu: Call touch_nmi_watchdog() while printing stall warnings

2018-05-30 07:50:50 +02:00

sched

sched/wait: Remove the lockless swait_active() check in swake_up*()

2018-08-06 16:23:02 +02:00

time

nohz: Fix local_timer_softirq_pending()

2018-08-09 12:17:57 +02:00

trace

uprobes: Use synchronize_rcu() not synchronize_sched()

2018-09-09 20:01:22 +02:00

.gitignore

…

acct.c

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

2018-01-10 09:29:51 +01:00

async.c

kernel/async.c: revert "async: simplify lowest_in_progress()"

2018-02-17 13:21:18 +01:00

audit_fsnotify.c

…

audit_tree.c

…

audit_watch.c

audit: Fix use after free in audit_remove_watch_rule()

2017-08-24 17:12:18 -07:00

audit.c

audit: return on memory error to avoid null pointer dereference

2018-05-30 07:50:49 +02:00

audit.h

…

auditfilter.c

audit: allow not equal op for audit by executable

2018-08-03 07:55:25 +02:00

auditsc.c

audit: allow not equal op for audit by executable

2018-08-03 07:55:25 +02:00

backtracetest.c

…

bounds.c

…

capability.c

ptrace: Capture the ptracer's creds not PT_PTRACE_CAP

2017-01-06 10:40:13 +01:00

cgroup_freezer.c

…

cgroup_pids.c

cgroup/pids: remove spurious suspicious RCU usage warning

2017-03-26 13:05:58 +02:00

cgroup.c

cgroup: fix error return value from cgroup_subtree_control()

2017-08-11 08:49:28 -07:00

compat.c

…

configs.c

…

context_tracking.c

…

cpu_pm.c

…

cpu.c

cpu/hotplug: Non-SMP machines do not make use of booted_once

2018-08-15 18:14:55 +02:00

cpuset.c

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

2017-10-12 11:51:25 +02:00

crash_dump.c

…

cred.c

…

delayacct.c

…

dma.c

…

elfcore.c

…

exec_domain.c

…

exit.c

kernel/exit.c: avoid undefined behaviour when calling wait4()

2018-05-19 10:27:01 +02:00

extable.c

kernel/extable.c: mark core_kernel_text notrace

2017-07-21 07:42:21 +02:00

fork.c

fork: unconditionally clear stack on fork

2018-08-09 12:18:00 +02:00

freezer.c

…

futex_compat.c

…

futex.c

futex: futex_wake_op, fix sign_extend32 sign bits

2018-05-19 10:27:00 +02:00

groups.c

kernel: make groups_sort calling a responsibility group_info allocators

2018-01-10 09:29:52 +01:00

hung_task.c

hung_task: allow hung_task_panic when hung_task_warnings is 0

2016-10-11 15:06:33 -07:00

irq_work.c

…

jump_label.c

jump_label: Invoke jump_label_test() via early_initcall()

2017-12-14 09:28:24 +01:00

kallsyms.c

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kcmp.c

…

Kconfig.freezer

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Kconfig.hz

…

Kconfig.locks

…

Kconfig.preempt

…

kcov.c

kcov: ensure irq code sees a valid area

2018-08-03 07:55:12 +02:00

kexec_core.c

objtool, x86: Add several functions and files to the objtool whitelist

2018-06-05 10:28:57 +02:00

kexec_file.c

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

2016-09-01 17:52:01 -07:00

kexec_internal.h

…

kexec.c

…

kmod.c

…

kprobes.c

kprobes: Make list and blacklist root user read only

2018-09-05 09:20:10 +02:00

ksysfs.c

…

kthread.c

kthread, tracing: Don't expose half-written comm when creating kthreads

2018-08-03 07:55:12 +02:00

latencytop.c

…

Makefile

kernel/watchdog.c: move hardlockup detector to separate file

2017-06-17 06:41:57 +02:00

membarrier.c

Fix: Disable sys_membarrier when nohz_full is enabled

2017-03-12 06:41:45 +01:00

memremap.c

mm: Fix devm_memremap_pages() collision handling

2018-02-28 10:18:34 +01:00

module_signing.c

…

module-internal.h

…

module.c

module: extend 'rodata=off' boot cmdline parameter to module mappings

2018-04-08 12:12:52 +02:00

notifier.c

…

nsproxy.c

…

padata.c

padata: free correct variable

2017-05-20 14:28:40 +02:00

panic.c

kernel/panic.c: add missing \n

2017-07-05 14:40:24 +02:00

params.c

…

pid_namespace.c

pid_ns: Sleep in TASK_INTERRUPTIBLE in zap_pid_ns_processes

2017-05-25 15:44:38 +02:00

pid.c

pidns: disable pid allocation if pid_ns_prepare_proc() is failed in alloc_pid()

2018-04-13 19:47:53 +02:00

profile.c

…

ptrace.c

ptrace: Properly initialize ptracer_cred on fork

2017-06-14 15:05:54 +02:00

range.c

…

reboot.c

…

relay.c

kernel/relay.c: limit kmalloc size to KMALLOC_MAX_SIZE

2018-05-30 07:50:29 +02:00

resource.c

resource: fix integer overflow at reallocation

2018-04-24 09:34:09 +02:00

seccomp.c

seccomp: Move speculation migitation control to arch code

2018-05-22 16:58:02 +02:00

signal.c

kernel/signal.c: avoid undefined behaviour in kill_something_info

2018-05-30 07:50:18 +02:00

smp.c

cpu/hotplug: Fix SMT supported evaluation

2018-08-15 18:14:53 +02:00

smpboot.c

kthread/smpboot: do not park in kthread_create_on_cpu()

2016-10-11 15:06:33 -07:00

smpboot.h

…

softirq.c

Mark HI and TASKLET softirq synchronous

2018-08-15 18:14:42 +02:00

stacktrace.c

stacktrace, lockdep: Fix address, newline ugliness

2017-02-14 15:25:42 -08:00

stop_machine.c

stop_machine: Use raw spinlocks

2018-08-03 07:55:24 +02:00

sys_ni.c

x86/pkeys: Fix pkeys build breakage for some non-x86 arches

2016-09-13 14:41:36 +02:00

sys.c

sys: don't hold uts_sem while accessing userspace memory

2018-09-09 20:01:24 +02:00

sysctl_binary.c

…

sysctl.c

sched/sysctl: Check user input value of sysctl_sched_time_avg

2018-09-05 09:20:04 +02:00

task_work.c

…

taskstats.c

taskstats: fix the length of cgroupstats_cmd_get_policy

2016-11-03 16:55:58 -04:00

test_kprobes.c

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torture.c

…

tracepoint.c

tracepoint: Do not warn on ENOMEM

2018-05-09 09:50:20 +02:00

tsacct.c

…

ucount.c

kernel/ucount.c: mark user_header with kmemleak_ignore()

2017-06-17 06:41:51 +02:00

uid16.c

kernel: make groups_sort calling a responsibility group_info allocators

2018-01-10 09:29:52 +01:00

up.c

smp: Add function to execute a function synchronously on a CPU

2016-09-05 13:52:39 +02:00

user_namespace.c

Merge branch 'nsfs-ioctls' into HEAD

2016-09-22 20:00:36 -05:00

user-return-notifier.c

…

user.c

…

utsname_sysctl.c

sys: don't hold uts_sem while accessing userspace memory

2018-09-09 20:01:24 +02:00

utsname.c

Merge branch 'nsfs-ioctls' into HEAD

2016-09-22 20:00:36 -05:00

watchdog_hld.c

kernel/watchdog: prevent false hardlockup on overloaded system

2017-06-17 06:41:57 +02:00

watchdog.c

kernel/watchdog: prevent false hardlockup on overloaded system

2017-06-17 06:41:57 +02:00

workqueue_internal.h

workqueue: Fix NULL pointer dereference

2017-11-15 15:53:17 +01:00

workqueue.c

workqueue: use put_device() instead of kfree()

2018-05-30 07:50:36 +02:00