From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from zeniv.linux.org.uk (zeniv.linux.org.uk [62.89.141.173]) (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 33FB21D63EF; Sun, 9 Nov 2025 06:37:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=62.89.141.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762670270; cv=none; b=Ed0WTosqXnRV7eZ2F0WkneFk6wS2ZMg22BT1UY9rLNLTZxhCBxk/3J55qM0sD/6wjxsf1dwGDUV8K/4bZPIYy40BK2b+haDbkFAyzQtinuLqutzosFKW+ytT0qiJhSbK5C/yn1r5w1zaiLThkK7Sk7mrtEmKRO4rLCDa9OVXX78= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762670270; c=relaxed/simple; bh=xQ7El2M28M0wHx+P+g8Yo1qBcNgqMr0WmiWcFdzVu9w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=H7/GkYdgHn2d0YEIJ/05NqLPbXyCUEPhU2hIaWbM4fd4MV34I43GrKXqI/fPzdOgB7cjvroRPH3AR7A1aHVu104Rxsk04KXYHMCDZhKNBwQewROmIt/1/jIZ++EA7pvmOf2wh+1iX62bpV2dj/+bT5TXXsW3C48rBdIT194nddY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zeniv.linux.org.uk; spf=none smtp.mailfrom=ftp.linux.org.uk; dkim=pass (2048-bit key) header.d=linux.org.uk header.i=@linux.org.uk header.b=QRWiAEWb; arc=none smtp.client-ip=62.89.141.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zeniv.linux.org.uk Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=ftp.linux.org.uk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linux.org.uk header.i=@linux.org.uk header.b="QRWiAEWb" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=linux.org.uk; s=zeniv-20220401; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=OSmE8RDttZ57sO3CJH0P4rRo3qRd5TrH+VcvqqudS9I=; b=QRWiAEWbTqDI0d8XXO+8WObLQY fjwkapBHYthSg3D0lol0ikoGX2YVObG1KuzxeCmqxkXoBJ7cDLsYQlDIm7KPtGH56MV+XHPalgkIB TyG8aCI/OUr+6DvWjWGWgqTyEQ82uYP/YxLw+unCXcxPcWpzzs4mOcAOMoNIOd57imxlXB22yrtGl RDesBe38i1tBf5BqfaJt2GHPmfQNBfqTfazUE42rXGrW57lg+pqC8XstzyPy3ZZLTHIJd1QYh4ztV bqwC6MTn5JThir4Nor1mqS2c9O5kslWKmi003lsS8aU99nNDia/ibvWiicZ4a47M1hRJNm/eCin/M /ptNBsbQ==; Received: from viro by zeniv.linux.org.uk with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1vHz3a-00000008lc2-1cfz; Sun, 09 Nov 2025 06:37:46 +0000 From: Al Viro To: linux-fsdevel@vger.kernel.org Cc: torvalds@linux-foundation.org, brauner@kernel.org, jack@suse.cz, mjguzik@gmail.com, paul@paul-moore.com, axboe@kernel.dk, audit@vger.kernel.org, io-uring@vger.kernel.org Subject: [RFC][PATCH 06/13] chroot(2): import pathname only once Date: Sun, 9 Nov 2025 06:37:38 +0000 Message-ID: <20251109063745.2089578-7-viro@zeniv.linux.org.uk> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20251109063745.2089578-1-viro@zeniv.linux.org.uk> References: <20251109063745.2089578-1-viro@zeniv.linux.org.uk> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: Al Viro Convert the user_path_at() call inside a retry loop into getname_flags() + filename_lookup() + putname() and leave only filename_lookup() inside the loop. In this case we never pass LOOKUP_EMPTY, so getname_flags() is equivalent to plain getname(). The things could be further simplified by use of cleanup.h stuff, but let's not clutter the patch with that. Signed-off-by: Al Viro --- fs/open.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/open.c b/fs/open.c index 8bc2f313f4a9..e67baae339fc 100644 --- a/fs/open.c +++ b/fs/open.c @@ -603,8 +603,9 @@ SYSCALL_DEFINE1(chroot, const char __user *, filename) struct path path; int error; unsigned int lookup_flags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY; + struct filename *name = getname(filename); retry: - error = user_path_at(AT_FDCWD, filename, lookup_flags, &path); + error = filename_lookup(AT_FDCWD, name, lookup_flags, &path, NULL); if (error) goto out; @@ -628,6 +629,7 @@ SYSCALL_DEFINE1(chroot, const char __user *, filename) goto retry; } out: + putname(name); return error; } -- 2.47.3