From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f44.google.com (mail-wm1-f44.google.com [209.85.128.44]) (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 8A36A248F57 for ; Sat, 4 Apr 2026 13:47:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.44 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775310473; cv=none; b=UmF9nsjp3kFCs3a5OOg3T0qbKLDvtDy8UJktncPx3RaTO3pVjNX/Ef6OY9zT/h6V3TBZpAH2jDv/exeizK3Mx2b7SHwxIm+zQJqZWGPERYQ27bEYZdHNQwhGnE6/k6pKcfeivZ5sTfNSIwwvwKKn+S9YGIOzgSZ0nbKAp/6JRas= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775310473; c=relaxed/simple; bh=uq0ekskcm1LLoYGE+0NzPOrNZYjEyHzQo7kQCHFrxeI=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=bxmN6jztB9lzmK8e8x/a9O0CC2htYpm7XXqXnk34JJV/Nv+ucWtH6NYQ/2nXbLdjUrRrwKBW8yAE2F0hPB3xZG0G4aA1fMExQSzM+DDsgds306PN5BSZGVSCqWHiFKDCIpFRnJNwNauXZFlpJD8Fauad9ey2DXGDViFWf2836uE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=M/V+D/OU; arc=none smtp.client-ip=209.85.128.44 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="M/V+D/OU" Received: by mail-wm1-f44.google.com with SMTP id 5b1f17b1804b1-4852b81c73aso22451655e9.3 for ; Sat, 04 Apr 2026 06:47:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1775310471; x=1775915271; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=RKsbChh/VnKTH+OmKvRes4T+gJ5uz/EkfVx8lzU6MpQ=; b=M/V+D/OU//6VDzZOaakxu4VylIsXYP1VEDtKxXxOl6x6XcLfPYuSKJQK1e/RWN7GTM bCWnDOVIJ3ohI+CUuwxxmDZnXUl/zLqHDEaSP4ptV0wbRXYww2v1qFLj8+D5R+vSYTcn 6ifWgaNIig55fmCCHDFw/ohpJlmLSTRkkGpjDf2Ys8prl2AE6NRWA1FLT7dvbrR7mr0L z5TFj+lXbUi/Oo7UdPkdovwAnyEmv9WKagjZCH/Eae23JZQwrI+/0Hm+R5it9HvafP67 LE5d5VXsM+u6YhpwmuKBXmsAL8txQg8z4ToqD71iidf2nWf+gInZJO70OK5ta9dBKmRm zKLQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775310471; x=1775915271; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=RKsbChh/VnKTH+OmKvRes4T+gJ5uz/EkfVx8lzU6MpQ=; b=fwJngKFoVDfz1H7gRC/50pFJEUgSYJNefnAU5SCHu1THM8BaxSEiy4SS46z4K6ED+Q eSDfWV+TMPVE7lsoAK4cKVylUOBQiOtTqAThrYn2lBHmgoaQLxGkm7UIu/bZ/wLsUn1U GoPWAHWUQ5ref4LIMI1zGhaucg91KFqaxP5S8/EfWq55y9jJbUVsOvEK8Y+UdNhn8Kze 4Xfa56TaLFeqvXmXWOaqBfCvia75gopZ34LqqN+O1of+UdS257xwP/pDuNzN3hnNlNov XVn6OsD1PtlFd3b3MQQ42q9iwnJc1inW2+2AAcQuYi8uFBCR5EfrYUCZHbfzBawwMGz1 ch0g== X-Forwarded-Encrypted: i=1; AJvYcCWxaz9JxfLwZdERa1GabpF7sPqVpTM21LtwgloB4xCX9DlJiSXpBP3n5IS1sC6UR/Qhxc0/Kr8=@vger.kernel.org X-Gm-Message-State: AOJu0YyrU1lkLV3ErHcA5F3kQpOpKFZCg4EiLQBIOC7IcA3nC8F9umCZ m5tT3qk/a9aL1l0MhIB55gjV4nj1QDzCwf5xA+war6dYpfnabkTJkqcW X-Gm-Gg: AeBDieuouwhxVBD90bpx6bVOHJn3LePrekA3sV4MZ0wPoFXQUqLouKu4Mf4+dxEuJjM EvipOJftb3GJo1UIzvnFEBup1vkW+rVP2IC2HWmDtOc41+aLh7Fb6UVyQh8yQf/4GRtebIMvOgF wE5a+SHEzoSKfQBappgTaVcHNGECsRnj7Y+2zIui9M6X+mgwG1hJSdg+CZgth2Olu76xRFR6whO 1v3r3HTd69YPa6/K5PnRmDKqrjJ1Kko/vw64BOAHCGw5BSL74zxXAyMCcfYYRSHjmVQGIvTrOD5 Ma4Q2raENbHFq9bNdfAVQOPLclI1thE4T4w9DY5pWAlcQUP6vuO6MbHCtOuFTYukZfCrrx+h9Ga jBmhTttHQhiJT8/3V8CxQMWTOhJKdpcWbqVmbPr5DgPbNc/Fh8W54FORyoQ6Mk6EwosJP3HSUx1 o/XUKW1M45qkanXPVIc7WJ7d4T33VdXUj+LQTHPI5JfEjuCxUwTjHPe/ats2QYbV+rymNkAidcw NysKTx7LgkK X-Received: by 2002:a05:600c:4e0b:b0:488:869c:eda6 with SMTP id 5b1f17b1804b1-488997d6b8dmr109572865e9.29.1775310470482; Sat, 04 Apr 2026 06:47:50 -0700 (PDT) Received: from dohko.chello.ie (188-141-5-72.dynamic.upc.ie. [188.141.5.72]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488a8d6e27csm24056165e9.6.2026.04.04.06.47.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 04 Apr 2026 06:47:50 -0700 (PDT) From: David Carlier To: rostedt@goodmis.org, mhiramat@kernel.org Cc: mathieu.desnoyers@efficios.com, kaleshsingh@google.com, linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, David Carlier Subject: [PATCH] tracefs: fix default permissions not being applied on initial mount Date: Sat, 4 Apr 2026 14:47:47 +0100 Message-ID: <20260404134747.98867-1-devnexen@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Commit e4d32142d1de ("tracing: Fix tracefs mount options") moved the option application from tracefs_fill_super() to tracefs_reconfigure() called from tracefs_get_tree(). This fixed mount options being ignored on user-space mounts when the superblock already exists, but introduced a regression for the initial kernel-internal mount. On the first mount (via simple_pin_fs during init), sget_fc() transfers fc->s_fs_info to sb->s_fs_info and sets fc->s_fs_info to NULL. When tracefs_get_tree() then calls tracefs_reconfigure(), it sees a NULL fc->s_fs_info and returns early without applying any options. The root inode keeps mode 0755 from simple_fill_super() instead of the intended TRACEFS_DEFAULT_MODE (0700). Furthermore, even on subsequent user-space mounts without an explicit mode= option, tracefs_apply_options(sb, true) gates the mode behind fsi->opts & BIT(Opt_mode), which is unset for the defaults. So the mode is never corrected unless the user explicitly passes mode=0700. Restore the tracefs_apply_options(sb, false) call in tracefs_fill_super() to apply default permissions on initial superblock creation, matching what debugfs does in debugfs_fill_super(). Fixes: e4d32142d1de ("tracing: Fix tracefs mount options") Cc: stable@vger.kernel.org Signed-off-by: David Carlier --- fs/tracefs/inode.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/tracefs/inode.c b/fs/tracefs/inode.c index edfdf139cb02..36058ba5ee48 100644 --- a/fs/tracefs/inode.c +++ b/fs/tracefs/inode.c @@ -491,6 +491,7 @@ static int tracefs_fill_super(struct super_block *sb, struct fs_context *fc) return err; sb->s_op = &tracefs_super_operations; + tracefs_apply_options(sb, false); set_default_d_op(sb, &tracefs_dentry_operations); return 0; -- 2.53.0