John Ogness 9c0a3aab4b kdb: Do not assume write() callback available ...

commit 6d3e0d8cc6 upstream.

It is allowed for consoles to not provide a write() callback. For
example ttynull does this.

Check if a write() callback is available before using it.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20230717194607.145135-2-john.ogness@linutronix.de
Cc: Brian Norris <briannorris@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2025-03-13 12:50:45 +01:00

..

bpf

bpf: fix potential error return

2025-01-09 13:28:49 +01:00

cgroup

cgroup: fix race between fork and cgroup.kill

2025-03-13 12:50:40 +01:00

configs

…

debug

kdb: Do not assume write() callback available

2025-03-13 12:50:45 +01:00

dma

memblock: drop memblock_free_early_nid() and memblock_free_early()

2025-03-13 12:50:07 +01:00

entry

entry: Respect changes to system call number by trace_sys_enter()

2024-04-10 16:18:46 +02:00

events

uprobes: fix kernel info leak via "[uprobes]" vma

2024-10-17 15:11:45 +02:00

futex

futex: Don't include process MM in futex key on no-MMU

2023-11-20 11:08:13 +01:00

gcov

gcov: add support for GCC 14

2024-07-05 09:14:34 +02:00

irq

genirq: Make handle_enforce_irqctx() unconditionally available

2025-03-13 12:49:52 +01:00

kcsan

kcsan: Turn report_filterlist_lock into a raw_spinlock

2024-12-14 19:51:35 +01:00

livepatch

livepatch: Fix missing newline character in klp_resolve_symbols()

2023-11-20 11:08:25 +01:00

locking

lockdep: fix deadlock issue between lockdep and rcu

2024-10-17 15:11:18 +02:00

power

PM: hibernate: Add error handling for syscore_suspend()

2025-03-13 12:50:12 +01:00

printk

printk: Fix signed integer overflow when defining LOG_BUF_LEN_MAX

2025-03-13 12:50:17 +01:00

rcu

rcu-tasks: Idle tasks on offline CPUs are in quiescent states

2024-12-14 19:50:41 +01:00

sched

sched: Don't try to catch up excess steal time.

2025-03-13 12:50:17 +01:00

time

clocksource: Use migrate_disable() to avoid calling get_random_u32() in atomic context

2025-03-13 12:50:42 +01:00

trace

bpf: Send signals asynchronously if !preemptible

2025-03-13 12:50:02 +01:00

.gitignore

…

acct.c

acct: fix potential integer overflow in encode_comp_t()

2022-12-31 13:14:40 +01:00

async.c

async: Introduce async_schedule_dev_nocall()

2024-02-23 08:54:25 +01:00

audit_fsnotify.c

fsnotify: make allow_dups a property of the group

2024-04-10 16:19:02 +02:00

audit_tree.c

fsnotify: pass flags argument to fsnotify_alloc_group()

2024-04-10 16:19:02 +02:00

audit_watch.c

fsnotify: pass flags argument to fsnotify_alloc_group()

2024-04-10 16:19:02 +02:00

audit.c

audit: Send netlink ACK before setting connection in auditd_set

2024-02-23 08:54:37 +01:00

audit.h

audit: log AUDIT_TIME_* records only from rules

2022-04-08 14:23:06 +02:00

auditfilter.c

ima: Avoid blocking in RCU read-side critical section

2024-07-18 13:07:34 +02:00

auditsc.c

audit: fix possible soft lockup in __audit_inode_child()

2023-09-19 12:22:39 +02:00

backtracetest.c

…

bounds.c

bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS

2024-05-02 16:24:50 +02:00

capability.c

…

cfi.c

cfi: Fix __cfi_slowpath_diag RCU usage with cpuidle

2022-06-22 14:22:04 +02:00

compat.c

sched_getaffinity: don't assume 'cpumask_size()' is fully initialized

2023-04-05 11:24:53 +02:00

configs.c

…

context_tracking.c

…

cpu_pm.c

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cpu.c

hrtimers: Handle CPU state correctly on hotplug

2025-01-23 17:16:02 +01:00

crash_core.c

kernel/crash_core: suppress unknown crashkernel parameter warning

2021-12-29 12:28:49 +01:00

crash_dump.c

…

cred.c

cred: switch to using atomic_long_t

2023-12-20 15:17:37 +01:00

delayacct.c

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dma.c

…

exec_domain.c

…

exit.c

mm: optimize the redundant loop of mm_update_owner_next()

2024-07-18 13:07:32 +02:00

extable.c

…

fail_function.c

kernel/fail_function: fix memory leak with using debugfs_lookup()

2023-03-11 13:57:38 +01:00

fork.c

posix-cpu-timers: Clear TICK_DEP_BIT_POSIX_TIMER on clone

2024-11-14 13:13:39 +01:00

freezer.c

…

gen_kheaders.sh

kheaders: Ignore silly-rename files

2025-01-23 17:16:00 +01:00

groups.c

…

hung_task.c

hung_task: move hung_task sysctl interface to hung_task.c

2025-03-13 12:49:50 +01:00

iomem.c

…

irq_work.c

…

jump_label.c

…

kallsyms.c

kallsyms: Make kallsyms_on_each_symbol generally available

2023-12-13 18:36:45 +01:00

kcmp.c

…

Kconfig.freezer

…

Kconfig.hz

…

Kconfig.locks

…

Kconfig.preempt

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kcov.c

kcov: mark in_softirq_really() as __always_inline

2025-01-09 13:28:50 +01:00

kexec_core.c

kexec: fix a memory leak in crash_shrink_memory()

2023-07-23 13:46:52 +02:00

kexec_elf.c

…

kexec_file.c

kexec: support purgatories with .text.hot sections

2023-06-21 15:59:14 +02:00

kexec_internal.h

panic, kexec: make __crash_kexec() NMI safe

2023-04-20 12:13:57 +02:00

kexec.c

kernel: kexec: copy user-array safely

2023-11-28 16:56:16 +00:00

kheaders.c

kheaders: Use array declaration instead of char

2023-05-11 23:00:17 +09:00

kmod.c

…

kprobes.c

kprobes: Fix to check symbol prefixes correctly

2024-08-19 05:45:42 +02:00

ksysfs.c

kexec: turn all kexec_mutex acquisitions into trylocks

2023-04-20 12:13:57 +02:00

kthread.c

kthread: unpark only parked kthread

2024-10-17 15:12:00 +02:00

latencytop.c

…

Makefile

futex: Move to kernel/futex/

2022-12-31 13:14:04 +01:00

module_signature.c

…

module_signing.c

…

module-internal.h

…

module.c

NFSD: Remove svc_serv_ops::svo_module

2024-04-10 16:19:01 +02:00

notifier.c

…

nsproxy.c

…

padata.c

padata: avoid UAF for reorder_work

2025-03-13 12:50:02 +01:00

panic.c

panic: Flush kernel log buffer at the end

2024-04-13 13:01:43 +02:00

params.c

…

pid_namespace.c

zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING

2024-07-05 09:14:24 +02:00

pid.c

…

profile.c

profiling: remove profile=sleep support

2024-08-19 05:45:39 +02:00

ptrace.c

ptrace: Reimplement PTRACE_KILL by always sending SIGKILL

2022-06-09 10:22:29 +02:00

range.c

…

reboot.c

kernel/reboot: emergency_restart: Set correct system_state

2023-11-28 16:56:31 +00:00

regset.c

…

relay.c

relayfs: fix out-of-bounds access in relay_file_read

2023-05-11 23:00:18 +09:00

resource_kunit.c

…

resource.c

resource: fix region_intersects() vs add_memory_driver_managed()

2024-10-17 15:11:59 +02:00

rseq.c

rseq: Remove broken uapi field layout on 32-bit little endian

2022-04-08 14:23:10 +02:00

scftorture.c

scftorture: Forgive memory-allocation failure if KASAN

2023-09-23 11:09:55 +02:00

scs.c

scs: Release kasan vmalloc poison in scs_free process

2021-11-18 19:16:29 +01:00

seccomp.c

seccomp: Invalidate seccomp mode to catch death failures

2022-02-16 12:56:38 +01:00

signal.c

signal: Replace BUG_ON()s

2024-10-17 15:11:27 +02:00

smp.c

smp: Add missing destroy_work_on_stack() call in smp_call_on_cpu()

2024-09-12 11:07:49 +02:00

smpboot.c

…

smpboot.h

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softirq.c

softirq: Fix suspicious RCU usage in __do_softirq()

2024-06-16 13:39:15 +02:00

stackleak.c

gcc-plugins/stackleak: Use noinstr in favor of notrace

2022-02-23 12:03:07 +01:00

stacktrace.c

stacktrace: move filter_irq_stacks() to kernel/stacktrace.c

2022-04-13 20:59:28 +02:00

static_call_inline.c

x86/static-call: provide a way to do very early static-call updates

2024-12-19 18:07:22 +01:00

static_call.c

static_call: Don't make __static_call_return0 static

2022-04-13 20:59:28 +02:00

stop_machine.c

…

sys_ni.c

syscalls: fix compat_sys_io_pgetevents_time64 usage

2024-07-05 09:14:50 +02:00

sys.c

getrusage: use sig->stats_lock rather than lock_task_sighand()

2024-03-15 10:48:22 -04:00

sysctl-test.c

…

sysctl.c

fs: move fs stat sysctls to file_table.c

2025-03-13 12:49:50 +01:00

task_work.c

task_work: Introduce task_work_cancel() again

2024-08-19 05:45:13 +02:00

taskstats.c

…

test_kprobes.c

…

torture.c

torture: Fix hang during kthread shutdown phase

2023-08-30 16:18:19 +02:00

tracepoint.c

…

tsacct.c

taskstats: Cleanup the use of task->exit_code

2022-01-27 11:05:35 +01:00

ucount.c

ucounts: fix counter leak in inc_rlimit_get_ucounts()

2024-11-14 13:13:42 +01:00

uid16.c

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uid16.h

…

umh.c

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up.c

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user_namespace.c

ucounts: Fix systemd LimitNPROC with private users regression

2022-03-08 19:12:42 +01:00

user-return-notifier.c

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user.c

…

usermode_driver.c

…

utsname_sysctl.c

…

utsname.c

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watch_queue.c

kernel: watch_queue: copy user-array safely

2023-11-28 16:56:16 +00:00

watchdog_hld.c

watchdog/perf: properly initialize the turbo mode timestamp and rearm counter

2024-08-19 05:45:20 +02:00

watchdog.c

watchdog: move softlockup_panic back to early_param

2023-11-28 16:56:28 +00:00

workqueue_internal.h

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workqueue.c

workqueue: Improve scalability of workqueue watchdog touch

2024-09-12 11:07:52 +02:00