From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.223.131]) (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 888CB367F2F; Mon, 28 Sep 2026 18:17:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=195.135.223.131 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790619424; cv=none; b=e4edfIqSWLES3Ur0ntlideaMYGE4Y7ULDkiT/ZEgLf5I1t61sMRd0qSu3LVUEzqcxyU9ekEm/yQFezz7CXfJ+UnPUWB46I/wHA0JzXcyrZl1LWW/C9s4z1Emo2Hw/5HIAkORdXWKa24JHpZu8Hx/vpnUM2ZBX6VsMny9A1yk+80= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790619424; c=relaxed/simple; bh=SYVzJO4yzxWfIt2ZjFDBTDCjKXe+MYl187jm/yAY27s=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=OsWy6Aq3cDpT2KujzoqoJdb6Hejvp7maDQ+YR0/UDjjTtAq1d/3q6JllRCo0SKgTO++e+9vJn1N2rkkp80FUeNXCWNvfTY0bGXgVw1CLEauIRt5Zx5DL7/UlBUG2emdT9y9bA+GoH3jPBPg3YqwqCLXSEFdoZixMR2naik1XnzE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de; spf=pass smtp.mailfrom=suse.de; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b=jsqBP4rH; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b=Cob2+ThX; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b=DTqAC8Q/; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b=WQUk4VM/; arc=none smtp.client-ip=195.135.223.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b="jsqBP4rH"; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b="Cob2+ThX"; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b="DTqAC8Q/"; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b="WQUk4VM/" Received: from imap1.dmz-prg2.suse.org (imap1.dmz-prg2.suse.org [IPv6:2a07:de40:b281:104:10:150:64:97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 06BE21F395; Mon, 28 Sep 2026 18:16:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1790619416; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=QhzBhh+sX2UeU6n8oJoJHyQ8DgBeRZdBkkfTngNCVDs=; b=jsqBP4rHDOMeIL+ouVMQQ0LO8ZYp8yC6NJGupeIFv4UwiHU/bX11QSinYhG6AH4K1TMCpd AJL5likiRIyDJ00bu7yGw6sTjrQDQMfIFC6i2mXIH67SL58h6QWiBU3vT2EXIVWCJ4IfRf Wc0ITgoNtn2n6K2wy+vdU2uTkpUrA9Q= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1790619416; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=QhzBhh+sX2UeU6n8oJoJHyQ8DgBeRZdBkkfTngNCVDs=; b=Cob2+ThX0ZnhUeavgoYaEdZ4fkPqAhpnFpLQkaFYZ/WsBXfOtgoYmK5iYukw0JuNpmteBM egk9vEOY4s91VFBQ== Authentication-Results: smtp-out2.suse.de; dkim=pass header.d=suse.de header.s=susede2_rsa header.b="DTqAC8Q/"; dkim=pass header.d=suse.de header.s=susede2_ed25519 header.b="WQUk4VM/" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1790619412; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=QhzBhh+sX2UeU6n8oJoJHyQ8DgBeRZdBkkfTngNCVDs=; b=DTqAC8Q/5I651HSgcOyPutAJHDFqAdHIqNueDifk3hAzlEx8yvJdoV+glaoS0LYqzGSh70 egqInx7JMF/xpnJn0TZHnKLg2hKdJojbqIKRn0mBIm1TAx4z1cPi3H3vzC7dU7bbkliVsK glbkoX5KUj36ocwzx2mzFH3w/5JjgTI= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1790619412; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=QhzBhh+sX2UeU6n8oJoJHyQ8DgBeRZdBkkfTngNCVDs=; b=WQUk4VM/WGEL3cU02YT2ORIz6Fe2zjOtlP5kI0ix/2Vw8prsay7hjX54RuJ/sh5GNZvxO2 3uUjaZnwKRsSEGBg== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 418F8133F1; Mon, 28 Sep 2026 18:16:50 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id IkdFAxKvumoMbAAAD6G6ig (envelope-from ); Mon, 28 Sep 2026 18:16:50 +0000 Date: Mon, 28 Sep 2026 19:16:48 +0100 From: Pedro Falcato To: Hajime Tazaki Cc: linux-mm@kvack.org, liam@infradead.org, rbm@suse.com, akpm@linux-foundation.org, luto@amacapital.net, brendan.jackman@linux.dev, david@kernel.org, liuhangbin@gmail.com, corbet@lwn.net, kees@kernel.org, ljs@kernel.org, broonie@kernel.org, mhocko@suse.com, rppt@kernel.org, shuah@kernel.org, surenb@google.com, vbabka@kernel.org, wad@chromium.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-um@lists.infradead.org, geert@linux-m68k.org, daniel@thingy.jp Subject: Re: [PATCH v3 1/3] selftests: kselftest: avoid cd - in runner Message-ID: References: <20260926010819.604346-1-thehajime@gmail.com> <20260926010819.604346-2-thehajime@gmail.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Spam-Score: -4.51 X-Rspamd-Queue-Id: 06BE21F395 X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spam-Level: X-Rspamd-Action: no action X-Spamd-Result: default: False [-4.51 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; RCPT_COUNT_TWELVE(0.00)[24]; FREEMAIL_TO(0.00)[gmail.com]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; RCVD_TLS_ALL(0.00)[]; TO_DN_SOME(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; FREEMAIL_CC(0.00)[kvack.org,infradead.org,suse.com,linux-foundation.org,amacapital.net,linux.dev,kernel.org,gmail.com,lwn.net,google.com,chromium.org,vger.kernel.org,lists.infradead.org,linux-m68k.org,thingy.jp]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns]; MISSING_XM_UA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; DKIM_TRACE(0.00)[suse.de:+]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from] X-Spam-Flag: NO On Mon, Sep 28, 2026 at 06:27:42PM +0100, Pedro Falcato wrote: > On Sat, Sep 26, 2026 at 10:08:17AM +0900, Hajime Tazaki wrote: > > The kselftest runner currently uses `cd -` to restore its working > > directory after running a test. > > > > This is not supported by the minimal BusyBox hush shell used by some > > NOMMU targets. Store the original directory explicitly and restore it > > with a quoted path instead. > > > > This also avoids printing the directory change performed by `cd -` and > > handles paths containing whitespace correctly. > > > > Cc: Shuah Khan > > Cc: Kees Cook > > Cc: Andy Lutomirski > > Cc: Will Drewry > > Cc: Mark Brown > > Cc: Brendan Jackman > > Cc: Hangbin Liu > > Cc: "Ricardo B. Marliere" > > Cc: linux-kselftest@vger.kernel.org > > Cc: linux-um@lists.infradead.org > > Cc: linux-mm@kvack.org > > Signed-off-by: Hajime Tazaki > > NACK. > > https://pubs.opengroup.org/onlinepubs/009695099/utilities/cd.html > > - > When a hyphen is used as the operand, this shall be equivalent to the command: > cd "$OLDPWD" && pwd > > which changes to the previous working directory and then writes its name. > > > If you're running selftests on !POSIX compliant shells, that's a > you-issue. Fix the shell, or use something decent. ... I realize I was a bit too aggressive but seriously, lets not support broken software, please? -- Pedro