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a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790999961; bh=Iz/iiVNpot9SQ40RqImswFHFAvzYEcM0QzTbuF87koc=; h=From:To:Cc:Subject:Date; b=CRVgJThudtPmKx6F0fS4quTB6ZiwftEwgVcOt/oHDqi+Wn2qlzhoua4NO+MWxwfBC AUkTUiMJAB971ZujH1Qwb77P9vmmtTCavBRXqeD3nBxron5keUmi4osrVSbA9ye4vi xkx7wyrgAisAXoGB4hCq+OFUyvEh0uZIQkHIvrHIOhX4Fn8kxrFCEv5jbzsJGDchpF YLHXfTDd8d8dmQR7xjAnDdeDcCBUBARDhoGYRnSMRocz51A+hxE8TLXwutTCGCP3S+ SRPBHGyASdeC/cOIaIyWlmyE6GtduVzcCfdM9VsEnp2ePSNAJsCM6J8CzPNjrmUB4x KgwaXD6h4BXhQ== From: Kees Cook To: Bill Wendling Cc: Kees Cook , Jonathan Corbet , Andrew Morton , David Gow , Petr Mladek , Sergey Senozhatsky , Shuvam Pandey , Steven Rostedt , =?UTF-8?q?G=C3=BCnther=20Noack?= , "Matthew Wilcox (Oracle)" , =?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?= , Andy Shevchenko , Masami Hiramatsu , Mathieu Desnoyers , Jiri Kosina , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , Ihor Solodrai , "Christophe Leroy (CS GROUP)" , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Shivaprasad G Bhat , Thorsten Blum , Alison Schofield , Dave Jiang , Greg Kroah-Hartman , Guangshuo Li , Ira Weiny , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Vishal Verma , Randy Dunlap , Shuah Khan , linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-security-module@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, nvdimm@lists.linux.dev, linux-doc@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH v4 00/11] seq_buf: Add seq_buf_strlen() Date: Fri, 2 Oct 2026 20:59:05 -0700 Message-ID: <20261003035906.too.263-kees@kernel.org> X-Mailer: git-send-email 2.55.0 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Developer-Signature: v=1; a=openpgp-sha256; l=2797; i=kees@kernel.org; h=from:subject:message-id; bh=o5V36NyfVK3hMKB+tbhdWbAituk8g3ITmVsNRW2Bu78=; b=owGbwMvMwCVmps19z/KJym7G02pJDFkHaic49f89dz/sTb7grdS7PYYOekF5J5isN2ulunw+8 +nK1huBHaUsDGJcDLJiiixBdu5xLh5v28Pd5yrCzGFlAhnCwMUpABN5vYThf2CNoetRRdvahU66 ermb7AoqdxeEHfrHJzBd2e/l4Zs9WxkZ9kmwzppgN1Vy0c6VPYzx5rZBptFpqeecN+7U1fsc+u8 DKwA= X-Developer-Key: i=kees@kernel.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit 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. v4: - add trailers from v3 - 03/11, 04/11: export seq_buf_putmem() and seq_buf_path(), which the tests call, so they also build as a module - 08/11: start out overflowed when the buffer has no NUL within its size, as strlcat() treats it as already truncated (Andy) - 09/11: use seq_buf_strlen() for flags_show()'s check whether any flag was printed, too (Madhavan) - 01/11, 05/11: drop doubled blank lines and re-wrap a declaration in the tests (Andy) - v3..v4 diff: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/diff/?id=dev/v7.3-rc2/seq_buf/v4&id2=dev/v7.3-rc2/seq_buf/v3 v3: https://lore.kernel.org/all/20260930235231.out.387-kees@kernel.org/ v2: https://lore.kernel.org/all/20260919002658.stay.929-kees@kernel.org/ v1: https://lore.kernel.org/all/20260917002312.i.923-kees@kernel.org/ 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 | 139 +++++- include/linux/trace_seq.h | 5 +- arch/powerpc/platforms/pseries/papr_scm.c | 6 +- kernel/bpf/diagnostics.c | 8 +- kernel/trace/trace_events.c | 4 +- kernel/trace/trace_events_hist.c | 6 +- lib/seq_buf.c | 37 +- lib/tests/seq_buf_kunit.c | 528 +++++++++++++++++++++- tools/testing/nvdimm/test/ndtest.c | 2 +- 10 files changed, 708 insertions(+), 36 deletions(-) -- 2.55.0