From patchwork Mon Apr 1 23:48:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Justin Stitt X-Patchwork-Id: 13613145 Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 243C756760 for ; Mon, 1 Apr 2024 23:48:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712015338; cv=none; b=CT9/Pfyq/pjMWfMvwxbvy0bvW1umfD6cb+3z54ryIjFLscsnFYHNOeHrxT4qOe3Ve0G9fH7lQgqDiwAmckGaDk3Br3vjyoe9adMRrRzY5oyuLYKLZNIL6ka2H/A+TCkwKT4qf7TgIVkfk6RYTJ9NjUWLdpDFfP34SVlmIWX2/SY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712015338; c=relaxed/simple; bh=4JhNkEpOiWMttmklKDS6dB8Whz9xSe93GiSKkFueDRI=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=JuYF2rCwNd8c6RSi9XYfzxOm5AqLtCFetx0nedFWpoWtWEHs2nanxqYh6RinOPk7xjpHom2uuQmxwNMtc1cJWEdPwyU+z21+G6Pj0b45owUcH2p4dowfKTZytb2n+kMl9SrBNxRLceVZl4XjhYk42BChjWXH+cJ0gbjIqAQ4Rm8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--justinstitt.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=vfaAFvG+; arc=none smtp.client-ip=209.85.128.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--justinstitt.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="vfaAFvG+" Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-614bc5c53a1so27507887b3.1 for ; Mon, 01 Apr 2024 16:48:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1712015336; x=1712620136; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=BeCArdFCgR6hPIyqHhpmGoh9zohrxgi2vCDzv1Uvsng=; b=vfaAFvG+mOqrKjbH9Ge0oDljZh/cSXm67PclGL+fcN/avO/woLbSPb5FLBQg6uXzLD dSp0OBr2PDyfRibpQSC9Pf+upEsj7RNSFzbFreM7ZqaVhqlhTrQT1xiu2arpA14YTk/u B6i6l0MZe+oOAzJEVDR5uwn+9Si+qJtNHjFZADP9xSHIz8a7epD4LZxRVqqN3WQTw+hc jTptohz3JTm6T1N4n2nnQoH2VXzgbD5gTZmanjnieO1HNHHgLDv+dEVqaLe4025qShDl Fh5+f7Ib09HcHAXUA3IaZB8LaCS/nqGZwikS8+sOb2Zm1mW7SinOyKRevnhJdYOBqSP3 S5xw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1712015336; x=1712620136; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=BeCArdFCgR6hPIyqHhpmGoh9zohrxgi2vCDzv1Uvsng=; b=dBdKjutSqDABMntCT5uu+aF2Jh8OvxHC2HbzVdwKPzUIX4c4PWrHDUqUONwQC9rQoW 7rvdCsFGgHSO9tMNjT7MzvslfWAIxMz4RXgdK9RMyIDHtarRUfQvQyFoaXvIrjVla4A0 h9D82JYFUaK4cHBYF7EXg49jB60fGw3GnEOYpU6+XFoFmBy+l82YkZv+a4MOsBwEzI20 Dmpqy8s6q9xhWLzkoytMpaEemd5TARHSd8Za9axJRSD1Ds0+IlLQ7pcRjq/aJCyRBb4x e+JDGlstnJD6m0q8Qzg7oXYtWGV5TKJhLGMJc68fFichGvL1b6aRxQZGykQi92uuEpUi 0d4Q== X-Gm-Message-State: AOJu0YxzUQsabZlqgX63+WrKLKWasN6VUqjVE5jBrzfpR9/4/zQLJVt1 6BQQYEu+gtCQ8JXYsVItO64cBJ7g45YWLfj372xcBC2ZQNK6KSF5/GJEQO49ECvlzy6/jKUxA9z dldVPS63bQjoeax8f6QSucw== X-Google-Smtp-Source: AGHT+IENg/l0w7lJnqGpT/qHSwpQYol/8NlTdFPuRBHCAciA1BzQJQzDQqMPR1/kH8jhEkZOGWe/9UtkbBomwoKlsA== X-Received: from jstitt-linux1.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:23b5]) (user=justinstitt job=sendgmr) by 2002:a05:6902:1006:b0:dcc:94b7:a7a3 with SMTP id w6-20020a056902100600b00dcc94b7a7a3mr769132ybt.12.1712015336258; Mon, 01 Apr 2024 16:48:56 -0700 (PDT) Date: Mon, 01 Apr 2024 23:48:52 +0000 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAONHC2YC/x3NwQrCMAyA4VcZORvoaq3iq4iHro0uoNlI6nCMv bvF43f5/w2MlMng2m2gtLDxJA39oYM8JnkScmkG73xwwfVoVSXPK7Lk16cQVk2ZkBaSavguPOG ILh39KZ7jEOIFWmlWevD3f7nd9/0HcnYlG3UAAAA= X-Developer-Key: i=justinstitt@google.com; a=ed25519; pk=tC3hNkJQTpNX/gLKxTNQKDmiQl6QjBNCGKJINqAdJsE= X-Developer-Signature: v=1; a=ed25519-sha256; t=1712015335; l=3378; i=justinstitt@google.com; s=20230717; h=from:subject:message-id; bh=4JhNkEpOiWMttmklKDS6dB8Whz9xSe93GiSKkFueDRI=; b=NKg6XG8BN99gUBI3M2EOxgxK+kUU1xCXzro+M6vtMFE/7+A6dbh9K6zgb0yyqbNaih+k6ztsO bX+IDfR2tSbBc3Hz4yHOB8t7lA0pR91YNefcOSR+Ppvq3Y+FZM5/PuR X-Mailer: b4 0.12.3 Message-ID: <20240401-strncpy-include-trace-events-mdio-h-v1-1-9cb5a4cda116@google.com> Subject: [PATCH] trace: events: cleanup deprecated strncpy uses From: Justin Stitt To: Andrew Lunn , Heiner Kallweit , Russell King , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Chuck Lever , Jeff Layton , Neil Brown , Olga Kornievskaia , Dai Ngo , Tom Talpey Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-hardening@vger.kernel.org, Justin Stitt strncpy() is deprecated for use on NUL-terminated destination strings [1] and as such we should prefer more robust and less ambiguous string interfaces. For 2 out of 3 of these changes we can simply swap in strscpy() as it guarantess NUL-termination which is needed for the following trace print. trace_rpcgss_context() should use memcpy as its format specifier %.*s allows for the length to be specifier (__entry->len). Due to this, acceptor does not technically need to be NUL-terminated. Moreover, swapping in strscpy() and keeping everything else the same could result in truncation of the source string by one byte. To remedy this, we could use `len + 1` but I am unsure of the size of the destination buffer so a simple memcpy should suffice. | TP_printk("win_size=%u expiry=%lu now=%lu timeout=%u acceptor=%.*s", | __entry->window_size, __entry->expiry, __entry->now, | __entry->timeout, __entry->len, __get_str(acceptor)) I suspect acceptor not to naturally be a NUL-terminated string due to the presence of some stringify methods. | .crstringify_acceptor = gss_stringify_acceptor, Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Signed-off-by: Justin Stitt Acked-by: Chuck Lever --- Note: build-tested only. Found with: $ rg "strncpy\(" --- include/trace/events/mdio.h | 2 +- include/trace/events/rpcgss.h | 2 +- include/trace/events/sock.h | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) --- base-commit: 928a87efa42302a23bb9554be081a28058495f22 change-id: 20240401-strncpy-include-trace-events-mdio-h-0a325676b468 Best regards, -- Justin Stitt diff --git a/include/trace/events/mdio.h b/include/trace/events/mdio.h index 0f241cbe00ab..285b3e4f83ba 100644 --- a/include/trace/events/mdio.h +++ b/include/trace/events/mdio.h @@ -25,7 +25,7 @@ TRACE_EVENT_CONDITION(mdio_access, ), TP_fast_assign( - strncpy(__entry->busid, bus->id, MII_BUS_ID_SIZE); + strscpy(__entry->busid, bus->id, MII_BUS_ID_SIZE); __entry->read = read; __entry->addr = addr; __entry->regnum = regnum; diff --git a/include/trace/events/rpcgss.h b/include/trace/events/rpcgss.h index ba2d96a1bc2f..274c297f1b15 100644 --- a/include/trace/events/rpcgss.h +++ b/include/trace/events/rpcgss.h @@ -618,7 +618,7 @@ TRACE_EVENT(rpcgss_context, __entry->timeout = timeout; __entry->window_size = window_size; __entry->len = len; - strncpy(__get_str(acceptor), data, len); + memcpy(__get_str(acceptor), data, len); ), TP_printk("win_size=%u expiry=%lu now=%lu timeout=%u acceptor=%.*s", diff --git a/include/trace/events/sock.h b/include/trace/events/sock.h index fd206a6ab5b8..1d0b98e6b2cc 100644 --- a/include/trace/events/sock.h +++ b/include/trace/events/sock.h @@ -109,7 +109,7 @@ TRACE_EVENT(sock_exceed_buf_limit, ), TP_fast_assign( - strncpy(__entry->name, prot->name, 32); + strscpy(__entry->name, prot->name, 32); __entry->sysctl_mem[0] = READ_ONCE(prot->sysctl_mem[0]); __entry->sysctl_mem[1] = READ_ONCE(prot->sysctl_mem[1]); __entry->sysctl_mem[2] = READ_ONCE(prot->sysctl_mem[2]);