From patchwork Thu Dec 19 02:34:48 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Yafang Shao X-Patchwork-Id: 13915196 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 66755E77184 for ; Thu, 19 Dec 2024 16:07:29 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0533210ED2E; Thu, 19 Dec 2024 16:07:26 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="HZe8BTSZ"; dkim-atps=neutral Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) by gabe.freedesktop.org (Postfix) with ESMTPS id B661C10E271; Thu, 19 Dec 2024 02:35:06 +0000 (UTC) Received: by mail-pl1-x62a.google.com with SMTP id d9443c01a7336-216395e151bso2164065ad.0; Wed, 18 Dec 2024 18:35:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1734575706; x=1735180506; darn=lists.freedesktop.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=6yZ75uwrgzXS/KAS9XiI4pfcH/Aa7U+Upt9QqSiD0i8=; b=HZe8BTSZyJ+q9OGkdxCCAQx+r1VJ6B4lUDaoZ2M/B4yhqxskkOvNxU6zAC3W3PMT4h KWyW3LYM8S+LqxSmySPt2PCo3ckrAXW+zfg1Ato2Y7CX3Nrrz8iE/1i9a6TKzHCNgkAM NQV4IoqRTDuVNIAUP0YAOG9XWVcgqXsLg8DWhrDupuHE/3a15y04Y25TZSVMNc1juPrp LCeyeAB8U5HXgmuSU0JQsmZFQjy+AGnJHxNLMIOjhQYmn25RICqpgrbivXW6AJngE/Q5 6Rdo1hyUyog0wx3xMeeRevgmDrHUJvHC2B76D4OCvx1KJYTldxkCR0rekTrNkvpjtaqY yxfA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1734575706; x=1735180506; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=6yZ75uwrgzXS/KAS9XiI4pfcH/Aa7U+Upt9QqSiD0i8=; b=cVJBrCDp5SBkUoscNKAeMHaMRaj7aLuWV3DeiWLav+vjezszTjRvPUpOAx3YFFmaZ1 226StqDHF6xinC899zkP7R6l3wZPe4xKwdLgZqMXEIvGPr/Vo2xWS29OQ8UsCkTtQZFG Kst8ILvRAxsJVGLM0ubHVJqv7AAAsntEBgZya3Xh1+cXTpNL+DzuU+HHIoJpAxzryHGr eJDmxBlheEoFVsi5XRSm/pA5eyjgD+wdU1F+MCw46ZMCtnUwDFcYduB5FtNTtjgrHBrM iv5hPCtCQAPxrW+ZsqxBxBe590KKiGF6rkXfrsyzG3+CRIzbcVL3QzmuQMLPtbQTC1jH 5CmQ== X-Forwarded-Encrypted: i=1; AJvYcCVBgPoSAn2KpbigBv3DY4KGBBMY3cBh4DqF9kQ3YCMWCdUiUT4akv96y23TvOtoYG5LnjLJrllxc6g=@lists.freedesktop.org, AJvYcCVRrvozocophIB3uM2gcCkmJLVB60xXhJSTb4/GLTRBz567oSD0HDjas43MdatWuCOdyHm06/eQOZ35@lists.freedesktop.org, AJvYcCW0CxuwCRc1XwfsfZB6w8qu0otKqHN0ulV5+cAU2kE9CLKeRT6VTN82UCQVpjP08i8BA5yfSf02og==@lists.freedesktop.org, AJvYcCXhldZKnKlmJD0Y7TIq5ZlOTcb29dUyPGdvsdW8QgdyoX5z0P4skdYN10vodDT5pkklQKju21iGsBY=@lists.freedesktop.org X-Gm-Message-State: AOJu0YyXA9GyD3/yxKsp6KZqGIh/sPetBIw79a9YKGKtU8ydT7BI0wdN cIBpXFQulhRv/bO4c6n+onMRyvBWBGFdIPjk44RY1kiwfjf2tWbV X-Gm-Gg: ASbGncu+KmTEYn0K1MfqYLN34iq9z+fDiSQNQ4cSeoxGpcmn7zL6Rg8cbCJD08ewNst ZrZcFEBmdUsoZJMyNz6h3ndYxSP9A6NI645H/qn1Hlmu8HqblqRgcmjeJq27AXzfOJ54MZUK+Tm lD4af+Igevk+V5M9ZKF9Mxt5rB101NRw3Qg7lmV/aXFkJBwXyfws6FA1RlKXvQEfCuIW87kPdhH xJjW5CcqJSaaP9FQKjEASi1YRboP4Ur99zoY3EXc53ozrwWtD2mTTOs9Id6ICo0SzKKa3TRG9JB BHpYovQ= X-Google-Smtp-Source: AGHT+IHDUXmWYVlYvXYhHIsD36N49JfOorXAToNFZUciCwG5nEYfG9fZ9g2sYrKUGUIeEzsd5pUGJQ== X-Received: by 2002:a17:902:f689:b0:215:2d2c:dd0c with SMTP id d9443c01a7336-219da5e3b97mr23433885ad.14.1734575706180; Wed, 18 Dec 2024 18:35:06 -0800 (PST) Received: from localhost.localdomain ([180.159.118.224]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-842b821da83sm142163a12.40.2024.12.18.18.35.01 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Wed, 18 Dec 2024 18:35:05 -0800 (PST) From: Yafang Shao To: akpm@linux-foundation.org Cc: torvalds@linux-foundation.org, pmladek@suse.com, kvalo@kernel.org, bp@alien8.de, andriy.shevchenko@linux.intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, x86@kernel.org, linux-snps-arc@lists.infradead.org, linux-wireless@vger.kernel.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, ocfs2-devel@lists.linux.dev, Yafang Shao , Serge Hallyn , Thomas Gleixner , Ingo Molnar , Peter Zijlstra , Darren Hart , Davidlohr Bueso , =?utf-8?q?Andr=C3=A9_Almeida?= Subject: [PATCH v2 1/5] kernel: Remove get_task_comm() and print task comm directly Date: Thu, 19 Dec 2024 10:34:48 +0800 Message-Id: <20241219023452.69907-2-laoar.shao@gmail.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) In-Reply-To: <20241219023452.69907-1-laoar.shao@gmail.com> References: <20241219023452.69907-1-laoar.shao@gmail.com> MIME-Version: 1.0 X-Mailman-Approved-At: Thu, 19 Dec 2024 16:07:24 +0000 X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Since task->comm is guaranteed to be NUL-terminated, we can print it directly without the need to copy it into a separate buffer. This simplifies the code and avoids unnecessary operations. Signed-off-by: Yafang Shao Cc: Serge Hallyn Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Darren Hart Cc: Davidlohr Bueso Cc: "André Almeida" --- kernel/capability.c | 8 ++------ kernel/futex/waitwake.c | 3 +-- 2 files changed, 3 insertions(+), 8 deletions(-) diff --git a/kernel/capability.c b/kernel/capability.c index dac4df77e376..e089d2628c29 100644 --- a/kernel/capability.c +++ b/kernel/capability.c @@ -38,10 +38,8 @@ __setup("no_file_caps", file_caps_disable); static void warn_legacy_capability_use(void) { - char name[sizeof(current->comm)]; - pr_info_once("warning: `%s' uses 32-bit capabilities (legacy support in use)\n", - get_task_comm(name, current)); + current->comm); } /* @@ -62,10 +60,8 @@ static void warn_legacy_capability_use(void) static void warn_deprecated_v2(void) { - char name[sizeof(current->comm)]; - pr_info_once("warning: `%s' uses deprecated v2 capabilities in a way that may be insecure\n", - get_task_comm(name, current)); + current->comm); } /* diff --git a/kernel/futex/waitwake.c b/kernel/futex/waitwake.c index 3a10375d9521..eb86a7ade06a 100644 --- a/kernel/futex/waitwake.c +++ b/kernel/futex/waitwake.c @@ -210,13 +210,12 @@ static int futex_atomic_op_inuser(unsigned int encoded_op, u32 __user *uaddr) if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) { if (oparg < 0 || oparg > 31) { - char comm[sizeof(current->comm)]; /* * kill this print and return -EINVAL when userspace * is sane again */ pr_info_ratelimited("futex_wake_op: %s tries to shift op by %d; fix this program\n", - get_task_comm(comm, current), oparg); + current->comm, oparg); oparg &= 31; } oparg = 1 << oparg;