[PATCH v3 00/11] seq_buf: Add seq_buf_strlen()

[Kees Cook <kees@kernel.org>]

Hi,

While working on seq_buf conversions[1], we found there was a need for
seq_buf_strlen() (since calling strlen(seq_buf_str()) would be a waste
of time: seq_buf already knows the length), seq_buf_init_append() (to
start a seq_buf from an existing string buffer), and seq_buf_terminate()
(as there are many callers using seq_buf_str() just for its termination
side-effect). And while implementing that, we found a bunch of other
related things that needed fixing. This is that ever-growing series,
with tests for each fix.

 v1: https://lore.kernel.org/all/20260917002312.i.923-kees@kernel.org/
 v2: https://lore.kernel.org/all/20260919002658.stay.929-kees@kernel.org/
 v3:
  - add trailers from v2
  - add seq_buf_terminate()
  - drop redundant bpf termination

Thanks!

-Kees

[1] https://lore.kernel.org/all/20260917011359.1585961-1-morbo@google.com/


Bill Wendling (1):
  seq_buf: Add seq_buf_init_append()

Kees Cook (10):
  seq_buf: Do not print an empty line from an overflowed
    seq_buf_do_printk()
  seq_buf: Do not pop from an overflowed seq_buf
  seq_buf: Copy what fits when seq_buf_puts() and seq_buf_putmem()
    overflow
  seq_buf: Clear what a writer did not claim when a seq_buf overflows
  seq_buf: Add seq_buf_strlen()
  seq_buf: Add seq_buf_terminate()
  bpf: Remove dead newline stripping from format_disasm_line()
  powerpc/papr_scm: Return the string length from the sysfs show
    functions
  nvdimm: ndtest: Return the string length from flags_show()
  docs: core-api: Document the seq_buf API

 Documentation/core-api/kernel-api.rst     |   9 +
 include/linux/seq_buf.h                   | 134 +++++-
 include/linux/trace_seq.h                 |   5 +-
 arch/powerpc/platforms/pseries/papr_scm.c |   4 +-
 kernel/bpf/diagnostics.c                  |   8 +-
 kernel/trace/trace_events.c               |   4 +-
 kernel/trace/trace_events_hist.c          |   6 +-
 lib/seq_buf.c                             |  35 +-
 lib/tests/seq_buf_kunit.c                 | 516 +++++++++++++++++++++-
 tools/testing/nvdimm/test/ndtest.c        |   2 +-
 10 files changed, 688 insertions(+), 35 deletions(-)

-- 
2.34.1