From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 97091405F7 for ; Fri, 20 Mar 2026 03:51:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773978709; cv=none; b=T46gEOUqlF60s7Qj1svbSXpezWARqyyW764S+b4EmzplxJqKy47LQYdJH1Ns5cv8CmmdpHC0pex/4MlstXR7NyaO0fD4fvu/BU4EfBK2hzT2NsFNFC5j5ddMcureALepvdmzKKzvJ+v/Vjux05ftk275AlaniPJBFECMJwGHrCU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773978709; c=relaxed/simple; bh=icBseSlhWE1Gkk2z2U3iVmemZ/fIuQKk84jxbilTgK4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=AMmhGX2qtoIM26RG2e5ugyUGrMvbvkp41Zr5WTFTbOLIw5UQfQFKNyoQ5kPNf6lant7gvD1VcUmhgZAUNE4OdBPtobOPLxWEVmLJZTwjE9En4n7hGPDEKxrH8gN1dbduS36q21cI/PqOiqvqeItv2KkBDol2veGMExM2T3YcAmY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VXfVF4bw; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="VXfVF4bw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 30C25C4CEF7; Fri, 20 Mar 2026 03:51:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773978709; bh=icBseSlhWE1Gkk2z2U3iVmemZ/fIuQKk84jxbilTgK4=; h=From:To:Cc:Subject:Date:From; b=VXfVF4bwl9aj9BHIiPXazNPf6IBe56jKHWrWsWUSxclrYWgQjU0IdqJbyoD6L+6vB Q0dMsY+Bzr5Cs+K+pomd14/UeeC0ixBjgM1orU7omwIlSuwu3c8mrVzrBX+ht/FGHM 3Ctj1goUapATmPVndDtRxWQaw0PEs9lTjUwiuN0CvfvthvtsEeu6MfR4mM+QiE+GQo NlazbMPb9RZAZmgDx9onpGehkVMX3QvBBRdMmGZGyhEuwBTzjI6QLL0+SZztb2RYc7 eMDkGsbScn2jNbmk/Du8/sBqih2HGPXco3Y6DAtfKUME8mXB+jXjlJYbk6b2BRoqQl 6Af5xVR56uHug== From: "Masami Hiramatsu (Google)" To: Petr Mladek , Steven Rostedt , Andy Shevchenko Cc: Rasmus Villemoes , Sergey Senozhatsky , Andrew Morton , David Laight , linux-kernel@vger.kernel.org Subject: [PATCH 0/1] lib/vsprintf: Date: Fri, 20 Mar 2026 12:51:44 +0900 Message-ID: <177397870465.32028.16886163523113776879.stgit@devnote2> X-Mailer: git-send-email 2.43.0 User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Hi, Here is a pair of patches to fix vsnprintf(). - Fix to limit the size of width and precision. - Warn if the return size is over INT_MAX. Recently we discussed snprintf() usage in bootconfig and found snprintf() design has a problem[1]. It returns the required or printed size in 'int' but the maxlen is passed by 'size_t'. The maxlen is already limited by INT_MAX, but if the expected print size becomes bigger than INT_MAX, it can return negative value. We also found width and precision size check does not work. [1] https://lore.kernel.org/all/20260317121507.30735331@gandalf.local.home/ Thank you, --- Masami Hiramatsu (Google) (2): lib/vsprintf: Fix to check field_width and precision lib/vsprintf: Limit the returning size to INT_MAX lib/vsprintf.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) -- Masami Hiramatsu (Google)