Randy Dunlap f64b0e4547 printk: fix return value of printk.devkmsg __setup handler ...

[ Upstream commit b665eae7a7 ]

If an invalid option value is used with "printk.devkmsg=<value>",
it is silently ignored.
If a valid option value is used, it is honored but the wrong return
value (0) is used, indicating that the command line option had an
error and was not handled. This string is not added to init's
environment strings due to init/main.c::unknown_bootoption()
checking for a '.' in the boot option string and then considering
that string to be an "Unused module parameter".

Print a warning message if a bad option string is used.
Always return 1 from the __setup handler to indicate that the command
line option has been handled.

Fixes: 750afe7bab ("printk: add kernel parameter to control writes to /dev/kmsg")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Igor Zhbanov <i.zhbanov@omprussia.ru>
Link: lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@omprussia.ru
Cc: Borislav Petkov <bp@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: John Ogness <john.ogness@linutronix.de>
Reviewed-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20220228220556.23484-1-rdunlap@infradead.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

2022-04-20 09:06:33 +02:00

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bpf

bpf: Add kconfig knob for disabling unpriv bpf by default

2022-02-16 12:43:54 +01:00

configs

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debug

kdb: Make memory allocations more robust

2021-03-03 17:44:31 +01:00

events

perf/core: Fix address filter parser for multiple filters

2022-04-20 09:06:32 +02:00

gcov

gcov: add support for GCC 10.1

2020-09-23 08:46:14 +02:00

irq

genirq: Disable interrupts for force threaded handlers

2021-03-24 10:59:26 +01:00

livepatch

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locking

locking/lockdep: Avoid RCU-induced noinstr fail

2021-11-26 11:48:27 +01:00

power

PM: suspend: fix return value of __setup handler

2022-04-20 09:06:31 +02:00

printk

printk: fix return value of printk.devkmsg __setup handler

2022-04-20 09:06:33 +02:00

rcu

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sched

sched/debug: Remove mpol_get/put and task_lock/unlock from sched_show_numa

2022-04-20 09:06:32 +02:00

time

timekeeping: Really make sure wall_to_monotonic isn't positive

2021-12-22 09:05:14 +01:00

trace

tracing: Ensure trace buffer is at least 4096 bytes large

2022-03-16 12:49:01 +01:00

.gitignore

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acct.c

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async.c

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audit_fsnotify.c

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audit_tree.c

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audit_watch.c

audit: CONFIG_CHANGE don't log internal bookkeeping as an event

2020-10-01 20:40:07 +02:00

audit.c

audit: fix a net reference leak in audit_list_rules_send()

2021-04-07 12:05:41 +02:00

audit.h

audit: fix a net reference leak in audit_list_rules_send()

2021-04-07 12:05:41 +02:00

auditfilter.c

audit: fix a net reference leak in audit_list_rules_send()

2021-04-07 12:05:41 +02:00

auditsc.c

audit: print empty EXECVE args

2019-11-28 18:28:55 +01:00

backtracetest.c

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bounds.c

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capability.c

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cgroup_freezer.c

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cgroup_pids.c

cgroup: pids: use atomic64_t for pids->limit

2019-12-21 10:42:02 +01:00

cgroup.c

cgroup-v1: Require capabilities to set release_agent

2022-02-11 08:41:17 +01:00

compat.c

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configs.c

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context_tracking.c

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cpu_pm.c

kernel/cpu_pm: Fix uninitted local in cpu_pm

2020-06-20 10:24:21 +02:00

cpu.c

kernel/cpu: add arch override for clear_tasks_mm_cpumask() mm handling

2020-12-29 13:44:50 +01:00

cpuset.c

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crash_dump.c

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cred.c

memcg: account security cred as well to kmemcg

2020-01-12 11:24:13 +01:00

delayacct.c

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dma.c

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exec_domain.c

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exit.c

futex: Mark the begin of futex exit explicitly

2021-02-03 23:19:49 +01:00

extable.c

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fork.c

mm/hugetlb: initialize hugetlb_usage in mm_init

2021-09-22 11:43:08 +02:00

freezer.c

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futex.c

mm, futex: fix shared futex pgoff on shmem huge page

2021-07-11 12:46:40 +02:00

groups.c

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hung_task.c

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irq_work.c

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jump_label.c

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kallsyms.c

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kcmp.c

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Kconfig.freezer

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Kconfig.hz

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Kconfig.locks

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Kconfig.preempt

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kcov.c

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kexec_core.c

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kexec_file.c

kernel: kexec_file: fix error return code of kexec_calculate_store_digests()

2021-05-22 10:40:31 +02:00

kexec_internal.h

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kexec.c

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kmod.c

usermodehelper: reset umask to default before executing user process

2020-10-14 09:48:14 +02:00

kprobes.c

kprobes: Limit max data_size of the kretprobe instances

2021-12-08 08:45:06 +01:00

ksysfs.c

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kthread.c

kthread: prevent deadlock when kthread_mod_delayed_work() races with kthread_cancel_delayed_work_sync()

2021-07-11 12:46:41 +02:00

latencytop.c

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Makefile

elfcore: fix building with clang

2021-02-10 09:09:25 +01:00

membarrier.c

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memremap.c

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module_signing.c

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module-internal.h

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module.c

module: Ignore _GLOBAL_OFFSET_TABLE_ when warning for undefined symbols

2021-03-03 17:44:44 +01:00

notifier.c

x86/mm: split vmalloc_sync_all()

2020-04-02 17:20:26 +02:00

nsproxy.c

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padata.c

padata: purge get_cpu and reorder_via_wq from padata_do_serial

2020-05-27 16:41:53 +02:00

panic.c

panic: ensure preemption is disabled during panic()

2019-10-17 13:42:25 -07:00

params.c

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pid_namespace.c

memcg: enable accounting for pids in nested pid namespaces

2021-09-22 11:43:08 +02:00

pid.c

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profile.c

profiling: fix shift-out-of-bounds bugs

2021-09-26 13:36:18 +02:00

ptrace.c

ptrace: Check PTRACE_O_SUSPEND_SECCOMP permission on PTRACE_SEIZE

2022-04-20 09:06:28 +02:00

range.c

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reboot.c

reboot: fix overflow parsing reboot cpu number

2020-11-18 18:26:32 +01:00

relay.c

kernel/relay.c: fix memleak on destroy relay channel

2020-08-26 10:29:03 +02:00

resource.c

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seccomp.c

seccomp: Add missing return in non-void function

2021-03-03 17:44:43 +01:00

signal.c

signal: Remove the bogus sigkill_pending in ptrace_stop

2021-11-26 11:48:24 +01:00

smp.c

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smpboot.c

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smpboot.h

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softirq.c

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stacktrace.c

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stop_machine.c

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sys_ni.c

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sys.c

prctl: allow to setup brk for et_dyn executables

2021-09-26 13:36:18 +02:00

sysctl_binary.c

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sysctl.c

x86/speculation: Include unprivileged eBPF status in Spectre v2 mitigation reporting

2022-03-11 10:03:31 +01:00

task_work.c

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taskstats.c

taskstats: fix data-race

2020-01-12 11:24:12 +01:00

test_kprobes.c

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torture.c

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tracepoint.c

tracepoint: Do not fail unregistering a probe due to memory failure

2021-03-03 17:44:38 +01:00

tsacct.c

taskstats: Cleanup the use of task->exit_code

2022-02-23 11:56:40 +01:00

ucount.c

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uid16.c

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up.c

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user_namespace.c

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user-return-notifier.c

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user.c

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utsname_sysctl.c

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utsname.c

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watchdog_hld.c

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watchdog.c

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workqueue_internal.h

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workqueue.c

workqueue: fix UAF in pwq_unbound_release_workfn()

2021-08-04 11:58:01 +02:00