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John Ogness 8d909b2333 printk: syslog: close window between wait and read 
Syslog's SYSLOG_ACTION_READ is supposed to block until the next
syslog record can be read, and then it should read that record.
However, because @syslog_lock is not held between waking up and
reading the record, another reader could read the record first,
thus causing SYSLOG_ACTION_READ to return with a value of 0, never
having read _anything_.

By holding @syslog_lock between waking up and reading, it can be
guaranteed that SYSLOG_ACTION_READ blocks until it successfully
reads a syslog record (or a real error occurs).

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20210715193359.25946-7-john.ogness@linutronix.de
2021-07-26 15:09:57 +02:00
..
bpf
bpf: Fix leakage under speculation on mispredicted branches
2021-06-14 23:06:10 +02:00
cgroup
Merge branch 'akpm' (patches from Andrew)
2021-06-29 17:29:11 -07:00
configs
drivers/char: remove /dev/kmem for good
2021-05-07 00:26:34 -07:00
debug
printk changes for 5.14
2021-06-29 12:07:18 -07:00
dma
Merge branch 'stable/for-linus-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb
2021-06-23 09:04:07 -07:00
entry
tick/nohz: Only check for RCU deferred wakeup on user/guest entry when needed
2021-05-31 10:14:49 +02:00
events
Merge branch 'akpm' (patches from Andrew)
2021-06-29 17:29:11 -07:00
gcov
gcov: clang: drop support for clang-10 and older
2021-05-07 00:26:32 -07:00
irq
irqchip updates for 5.14
2021-06-28 11:55:20 +02:00
kcsan
sched: Introduce task_is_running()
2021-06-18 11:43:07 +02:00
livepatch
Livepatching changes for 5.13
2021-04-27 18:14:38 -07:00
locking
Scheduler udpates for this cycle:
2021-06-28 12:14:19 -07:00
power
PM: hibernate: remove leading spaces before tabs
2021-06-11 18:52:05 +02:00
printk
printk: syslog: close window between wait and read
2021-07-26 15:09:57 +02:00
rcu
sched: Change task_struct::state
2021-06-18 11:43:09 +02:00
sched
Updates to the tick/nohz code in this cycle:
2021-06-28 12:22:06 -07:00
time
-----BEGIN PGP SIGNATURE-----
2021-06-29 12:31:16 -07:00
trace
printk: remove NMI tracking
2021-07-26 15:09:44 +02:00
.gitignore
.gitignore: prefix local generated files with a slash
2021-05-02 00:43:35 +09:00
acct.c
kernel/acct.c: use #elif instead of #end and #elif
2020-12-15 22:46:15 -08:00
async.c
kernel/async.c: remove async_unregister_domain()
2021-05-07 00:26:33 -07:00
audit_fsnotify.c
audit_alloc_mark(): don't open-code ERR_CAST()
2021-02-23 10:25:27 -05:00
audit_tree.c
fsnotify: generalize handle_inode_event()
2020-12-03 14:58:35 +01:00
audit_watch.c
fsnotify: generalize handle_inode_event()
2020-12-03 14:58:35 +01:00
audit.c
lsm: separate security_task_getsecid() into subjective and objective variants
2021-03-22 15:23:32 -04:00
audit.h
audit: avoid -Wempty-body warning
2021-03-24 12:11:48 -04:00
auditfilter.c
lsm: separate security_task_getsecid() into subjective and objective variants
2021-03-22 15:23:32 -04:00
auditsc.c
audit/stable-5.13 PR 20210426
2021-04-27 13:50:58 -07:00
backtracetest.c
…
bounds.c
…
capability.c
capability: handle idmapped mounts
2021-01-24 14:27:16 +01:00
cfi.c
add support for Clang CFI
2021-04-08 16:04:20 -07:00
compat.c
…
configs.c
…
context_tracking.c
…
cpu_pm.c
…
cpu.c
A fix for the CPU hotplug and cpusets interaction:
2021-06-29 12:23:02 -07:00
crash_core.c
mm: replace CONFIG_FLAT_NODE_MEM_MAP with CONFIG_FLATMEM
2021-06-29 10:53:55 -07:00
crash_dump.c
…
cred.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2021-06-28 20:39:26 -07:00
delayacct.c
delayacct: Add sysctl to enable at runtime
2021-05-12 11:43:25 +02:00
dma.c
…
exec_domain.c
…
exit.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2021-06-28 20:39:26 -07:00
extable.c
…
fail_function.c
fault-injection: handle EI_ETYPE_TRUE
2020-12-15 22:46:19 -08:00
fork.c
Merge branch 'akpm' (patches from Andrew)
2021-06-29 17:29:11 -07:00
freezer.c
sched: Add get_current_state()
2021-06-18 11:43:08 +02:00
futex.c
Locking changes for this cycle:
2021-06-28 11:45:29 -07:00
gen_kheaders.sh
kbuild: redo fake deps at include/config/*.h
2021-04-25 05:26:10 +09:00
groups.c
groups: simplify struct group_info allocation
2021-02-26 09:41:03 -08:00
hung_task.c
sched: Change task_struct::state
2021-06-18 11:43:09 +02:00
iomem.c
…
irq_work.c
irq_work: Make irq_work_queue() NMI-safe again
2021-06-10 10:00:08 +02:00
jump_label.c
jump_label: Free jump_entry::key bit1 for build use
2021-05-12 14:54:55 +02:00
kallsyms.c
kallsyms: strip ThinLTO hashes from static functions
2021-04-08 16:04:21 -07:00
kcmp.c
Merge branch 'exec-update-lock-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:36:48 -08:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
sched: Add CONFIG_SCHED_CORE help text
2021-06-01 16:00:10 +02:00
kcov.c
kernel: make kcov_common_handle consider the current context
2020-11-02 18:00:20 -08:00
kexec_core.c
printk: remove safe buffers
2021-07-26 15:09:34 +02:00
kexec_elf.c
…
kexec_file.c
kernel: kexec_file: fix error return code of kexec_calculate_store_digests()
2021-05-07 00:26:32 -07:00
kexec_internal.h
kexec: move machine_kexec_post_load() to public interface
2021-02-22 12:33:26 +00:00
kexec.c
…
kheaders.c
…
kmod.c
modules: add CONFIG_MODPROBE_PATH
2021-05-07 00:26:33 -07:00
kprobes.c
kprobes: Remove kprobe::fault_handler
2021-06-01 16:00:08 +02:00
ksysfs.c
…
kthread.c
Merge branch 'akpm' (patches from Andrew)
2021-06-29 17:29:11 -07:00
latencytop.c
…
Makefile
kbuild: update config_data.gz only when the content of .config is changed
2021-05-02 00:43:35 +09:00
module_signature.c
module: harden ELF info handling
2021-01-19 10:24:45 +01:00
module_signing.c
module: harden ELF info handling
2021-01-19 10:24:45 +01:00
module-internal.h
…
module.c
module: limit enabling module.sig_enforce
2021-06-22 11:13:19 -07:00
notifier.c
…
nsproxy.c
fixes-v5.11
2020-12-14 16:40:27 -08:00
padata.c
…
panic.c
printk: remove safe buffers
2021-07-26 15:09:34 +02:00
params.c
Modules updates for v5.11
2020-12-17 13:01:31 -08:00
pid_namespace.c
fixes-v5.11
2020-12-14 16:40:27 -08:00
pid.c
Merge branch 'exec-update-lock-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:36:48 -08:00
profile.c
kernel: Initialize cpumask before parsing
2021-04-10 13:35:54 +02:00
ptrace.c
sched: Change task_struct::state
2021-06-18 11:43:09 +02:00
range.c
…
reboot.c
reboot: Add hardware protection power-off
2021-06-21 13:08:36 +01:00
regset.c
…
relay.c
relay: allow the use of const callback structs
2020-12-15 22:46:18 -08:00
resource_kunit.c
resource: provide meaningful MODULE_LICENSE() in test suite
2020-11-25 18:52:35 +01:00
resource.c
kernel/resource: fix return code check in __request_free_mem_region
2021-05-14 19:41:32 -07:00
rseq.c
rseq: Optimise rseq_get_rseq_cs() and clear_rseq_cs()
2021-04-14 18:04:09 +02:00
scftorture.c
scftorture: Add debug output for wrong-CPU warning
2021-01-04 13:53:41 -08:00
scs.c
scs: switch to vmapped shadow stacks
2020-12-01 10:30:28 +00:00
seccomp.c
seccomp: Support atomic "addfd + send reply"
2021-06-28 12:49:52 -07:00
signal.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2021-06-28 20:39:26 -07:00
smp.c
smp: Fix smp_call_function_single_async prototype
2021-05-06 15:33:49 +02:00
smpboot.c
sched/core: Initialize the idle task with preemption disabled
2021-05-12 13:01:45 +02:00
smpboot.h
…
softirq.c
sched: Introduce task_is_running()
2021-06-18 11:43:07 +02:00
stackleak.c
…
stacktrace.c
…
static_call.c
static_call: Fix unused variable warn w/o MODULE
2021-04-09 13:22:12 +02:00
stop_machine.c
stop_machine: Add caller debug info to queue_stop_cpus_work
2021-03-23 16:01:58 +01:00
sys_ni.c
Add Landlock, a new LSM from Mickaël Salaün <mic@linux.microsoft.com>
2021-05-01 18:50:44 -07:00
sys.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2021-06-28 20:39:26 -07:00
sysctl-test.c
…
sysctl.c
Merge branch 'akpm' (patches from Andrew)
2021-06-29 17:29:11 -07:00
task_work.c
kasan: record task_work_add() call stack
2021-04-30 11:20:42 -07:00
taskstats.c
treewide: rename nla_strlcpy to nla_strscpy.
2020-11-16 08:08:54 -08:00
test_kprobes.c
…
torture.c
torture: Replace torture_init_begin string with %s
2021-03-08 14:22:28 -08:00
tracepoint.c
tracepoints: Code clean up
2021-02-09 12:27:29 -05:00
tsacct.c
…
ucount.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2021-06-28 20:39:26 -07:00
uid16.c
…
uid16.h
…
umh.c
kernel/umh.c: fix some spelling mistakes
2021-05-07 00:26:34 -07:00
up.c
A set of locking related fixes and updates:
2021-05-09 13:07:03 -07:00
user_namespace.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2021-06-28 20:39:26 -07:00
user-return-notifier.c
…
user.c
Reimplement RLIMIT_MEMLOCK on top of ucounts
2021-04-30 14:14:02 -05:00
usermode_driver.c
bpf: Fix umd memory leak in copy_process()
2021-03-19 22:23:19 +01:00
utsname_sysctl.c
…
utsname.c
…
watch_queue.c
watch_queue: rectify kernel-doc for init_watch()
2021-01-26 11:16:34 +00:00
watchdog_hld.c
…
watchdog.c
kernel: watchdog: modify the explanation related to watchdog thread
2021-06-29 10:53:46 -07:00
workqueue_internal.h
…
workqueue.c
wq: handle VM suspension in stall detection
2021-05-20 12:58:30 -04:00