Messages in this thread | | | Date | Thu, 21 Jan 2021 17:04:01 +0100 | From | Petr Mladek <> | Subject | [GIT PULL] printk regression fixes for 5.11-rc5 |
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Linus,
please pull three printk fixes from
git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux.git tags/printk-for-5.11-printk-rework-fixup
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- Fix line counting and buffer size calculation. Both regressions caused that a reader buffer might not get filled as much as possible.
- Restore non-documented behavior of printk() reader API and make it official. It did not fill the last byte of the provided buffer before 5.10. Two architectures, powerpc and um, used it to add the trailing '\0'. There might theoretically be more callers depending on this behavior in userspace.
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All three regressions were found and fixed by John when working on another changes.
---------------------------------------------------------------- John Ogness (3): printk: ringbuffer: fix line counting printk: fix kmsg_dump_get_buffer length calulations printk: fix buffer overflow potential for print_text()
Petr Mladek (1): Merge branch 'printk-rework' into for-linus
kernel/printk/printk.c | 40 ++++++++++++++++++++++++++++----------- kernel/printk/printk_ringbuffer.c | 2 +- 2 files changed, 30 insertions(+), 12 deletions(-)
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