From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 A08C53AAF6D; Mon, 17 Aug 2026 15:12:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786979566; cv=none; b=oM/sTrE/QCJOBgHYq5+ZNyUkneb+bnLnFS64XILS2bivRvDLluhAifftonzI5ZFMSNEpXAEiAUisWQ0ZjRMT/F566q+8FooMVvMNxLPGsxUXi+1725VGBYCzd3VkxbWTlkAgf3O/koXhYW//NVDE1n7p1mYduwcfRlafJhyKHuE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786979566; c=relaxed/simple; bh=rTWN9RntF2spNWweKetMMCwXaZa3dQjWo4E4KabMTxM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=e0mbYzLLFswwGp0ADAvGP75mWTRUqyEl88tYIy48iFf05djMAuds0NoRUVWSdaFTjnMt5+hFkbr4VAQQtYOkf3aXGJ3dOeLPlpYoPCNPLarEl58X5c5UMmgKQ/tl6mNZZObYHNc1jAj303quYjOTtZWDfVaulV7QLaT6eYP73Yc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=dj4qQGz+; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="dj4qQGz+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EFA7C1F000E9; Mon, 17 Aug 2026 15:12:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786979565; bh=hNu8Kv6MlbUMZFGV4IrK4qS3LjSFJxa6ZzIUifZvaps=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=dj4qQGz+pwHrdbGtk9mnKpSHjXaDBc0yH2HtFpjSuYogNeqz/x+svTiR7BYfOC6Ho TCI+t1bVcHaw/gDoMf7b/h97nHX7IuhyljhDBDMRmJVPTQy9MB/G4aa09eaMdpb5G3 ElD/oHSsamqNhoEKHFKjzbEeZfB/hsE3xnSKI2Gs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Magnus Lindholm , Jann Horn , "Christian Brauner (Amutable)" Subject: [PATCH 6.1 269/609] proc: Fix broken error paths for namespace links Date: Mon, 17 Aug 2026 15:29:25 +0200 Message-ID: <20260817132553.114117963@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260817132543.039278408@linuxfoundation.org> References: <20260817132543.039278408@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jann Horn commit 425224c2d700391729be7fe6929a88ef4e2d7a4e upstream. Don't return the return value of down_read_killable() (0) when a ptrace access check fails, return -EACCES as intended. Reported-by: Magnus Lindholm Closes: https://lore.kernel.org/r/20260706170735.2941493-1-linmag7@gmail.com Fixes: 6650527444da ("proc: protect ptrace_may_access() with exec_update_lock (part 1)") Cc: stable@vger.kernel.org Signed-off-by: Jann Horn Link: https://patch.msgid.link/20260706-procfs-ns-eacces-fix-v1-1-a69ab14c02e6@google.com Tested-by: Magnus Lindholm Signed-off-by: Christian Brauner (Amutable) Signed-off-by: Greg Kroah-Hartman --- fs/proc/namespaces.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/fs/proc/namespaces.c +++ b/fs/proc/namespaces.c @@ -46,7 +46,7 @@ static const char *proc_ns_get_link(stru const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns_ops; struct task_struct *task; struct path ns_path; - int error = -EACCES; + int error; if (!dentry) return ERR_PTR(-ECHILD); @@ -59,6 +59,7 @@ static const char *proc_ns_get_link(stru if (error) goto out_put_task; + error = -EACCES; if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) goto out; @@ -90,6 +91,7 @@ static int proc_ns_readlink(struct dentr if (res) goto out_put_task; + res = -EACCES; if (ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) { res = ns_get_name(name, sizeof(name), task, ns_ops); if (res >= 0)