linux/kernel/printk, branch v5.11

Merge branch 'printk-rework' into for-linus

2021-01-25T13:29:35Z

printk: fix string termination for record_print_text()

2021-01-25T09:37:08Z

Commit f0e386ee0c0b ("printk: fix buffer overflow potential for print_text()") added string termination in record_print_text(). However it used the wrong base pointer for adding the terminator. This led to a 0-byte being written somewhere beyond the buffer. Use the correct base pointer when adding the terminator. Fixes: f0e386ee0c0b ("printk: fix buffer overflow potential for print_text()") Reported-by: Sven Schnelle Signed-off-by: John Ogness Signed-off-by: Petr Mladek Link: https://lore.kernel.org/r/20210124202728.4718-1-john.ogness@linutronix.de

Merge branch 'printk-rework' into for-linus

2021-01-21T15:06:21Z

printk: fix buffer overflow potential for print_text()

2021-01-19T10:42:14Z

Before the commit 896fbe20b4e2333fb55 ("printk: use the lockless ringbuffer"), msg_print_text() would only write up to size-1 bytes into the provided buffer. Some callers expect this behavior and append a terminator to returned string. In particular: arch/powerpc/xmon/xmon.c:dump_log_buf() arch/um/kernel/kmsg_dump.c:kmsg_dumper_stdout() msg_print_text() has been replaced by record_print_text(), which currently fills the full size of the buffer. This causes a buffer overflow for the above callers. Change record_print_text() so that it will only use size-1 bytes for text data. Also, for paranoia sakes, add a terminator after the text data. And finally, document this behavior so that it is clear that only size-1 bytes are used and a terminator is added. Fixes: 896fbe20b4e2333fb55 ("printk: use the lockless ringbuffer") Cc: stable@vger.kernel.org # 5.10+ Signed-off-by: John Ogness Reviewed-by: Petr Mladek Acked-by: Sergey Senozhatsky Signed-off-by: Petr Mladek Link: https://lore.kernel.org/r/20210114170412.4819-1-john.ogness@linutronix.de

printk: fix kmsg_dump_get_buffer length calulations

2021-01-15T10:32:52Z

kmsg_dump_get_buffer() uses @syslog to determine if the syslog prefix should be written to the buffer. However, when calculating the maximum number of records that can fit into the buffer, it always counts the bytes from the syslog prefix. Use @syslog when calculating the maximum number of records that can fit into the buffer. Fixes: e2ae715d66bf ("kmsg - kmsg_dump() use iterator to receive log buffer content") Signed-off-by: John Ogness Reviewed-by: Petr Mladek Acked-by: Sergey Senozhatsky Signed-off-by: Petr Mladek Link: https://lore.kernel.org/r/20210113164413.1599-1-john.ogness@linutronix.de

printk: ringbuffer: fix line counting

2021-01-15T10:30:03Z

Counting text lines in a record simply involves counting the number of newline characters (+1). However, it is searching the full data block for newline characters, even though the text data can be (and often is) a subset of that area. Since the extra area in the data block was never initialized, the result is that extra newlines may be seen and counted. Restrict newline searching to the text data length. Fixes: b6cf8b3f3312 ("printk: add lockless ringbuffer") Signed-off-by: John Ogness Reviewed-by: Petr Mladek Acked-by: Sergey Senozhatsky Signed-off-by: Petr Mladek Link: https://lore.kernel.org/r/20210113144234.6545-1-john.ogness@linutronix.de

Merge tag 'printk-for-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

2020-12-16T18:45:11Z

Pull printk updates from Petr Mladek: - Finally allow parallel writes and reads into/from the lockless ringbuffer. But it is not a complete solution. Readers are still serialized against each other. And nested writes are still prevented by printk_safe per-CPU buffers. - Use ttynull as the ultimate fallback for /dev/console. - Officially allow disabling console output by using console="" or console=null - A few code cleanups * tag 'printk-for-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux: printk: remove logbuf_lock writer-protection of ringbuffer printk: inline log_output(),log_store() in vprintk_store() printk: remove obsolete dead assignment printk/console: Allow to disable console output by using console="" or console=null init/console: Use ttynull as a fallback when there is no console printk: ringbuffer: Reference text_data_ring directly in callees.

Merge tag 'sched-core-2020-12-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2020-12-15T02:29:11Z

Pull scheduler updates from Thomas Gleixner: - migrate_disable/enable() support which originates from the RT tree and is now a prerequisite for the new preemptible kmap_local() API which aims to replace kmap_atomic(). - A fair amount of topology and NUMA related improvements - Improvements for the frequency invariant calculations - Enhanced robustness for the global CPU priority tracking and decision making - The usual small fixes and enhancements all over the place * tag 'sched-core-2020-12-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (61 commits) sched/fair: Trivial correction of the newidle_balance() comment sched/fair: Clear SMT siblings after determining the core is not idle sched: Fix kernel-doc markup x86: Print ratio freq_max/freq_base used in frequency invariance calculations x86, sched: Use midpoint of max_boost and max_P for frequency invariance on AMD EPYC x86, sched: Calculate frequency invariance for AMD systems irq_work: Optimize irq_work_single() smp: Cleanup smp_call_function*() irq_work: Cleanup sched: Limit the amount of NUMA imbalance that can exist at fork time sched/numa: Allow a floating imbalance between NUMA nodes sched: Avoid unnecessary calculation of load imbalance at clone time sched/numa: Rename nr_running and break out the magic number sched: Make migrate_disable/enable() independent of RT sched/topology: Condition EAS enablement on FIE support arm64: Rebuild sched domains on invariance status changes sched/topology,schedutil: Wrap sched domains rebuild sched/uclamp: Allow to reset a task uclamp constraint value sched/core: Fix typos in comments Documentation: scheduler: fix information on arch SD flags, sched_domain and sched_debug ...

Merge branch 'for-5.11' into for-linus

2020-12-14T14:15:07Z

Merge branch 'for-5.11-null-console' into for-linus

2020-12-14T14:14:57Z