From mboxrd@z Thu Jan 1 00:00:00 1970 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B8A67C7EE23 for ; Wed, 1 Mar 2023 21:00:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229480AbjCAVAR (ORCPT ); Wed, 1 Mar 2023 16:00:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36318 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229540AbjCAVAQ (ORCPT ); Wed, 1 Mar 2023 16:00:16 -0500 Received: from mail-wr1-x434.google.com (mail-wr1-x434.google.com [IPv6:2a00:1450:4864:20::434]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C848E4E5C2 for ; Wed, 1 Mar 2023 13:00:13 -0800 (PST) Received: by mail-wr1-x434.google.com with SMTP id t15so14608808wrz.7 for ; Wed, 01 Mar 2023 13:00:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=in-reply-to:from:content-language:references:cc:to:subject :user-agent:mime-version:date:message-id:from:to:cc:subject:date :message-id:reply-to; bh=KFtJz9RVp457IWDINHeujMGMxTfe7m0UuqKuNpc/14U=; b=dPyLlYyHygFte6MEZRbZTO5kNWAht6aWcU+ATFw2/F1AHMUo2GnKF9AZ5IEACPfTVz ssJ7PWGp8pNwNE+K9KulxcqpEkm9hoc71b31riU+iG+k2PaS6XPyHIHsb8C+hLWVwQCi 59T6Ba5eYHIAXbO7Yj++1S/fPRW4Ok612Z1+gHjdBRA5yBwOmd1+ETmw2FW0nyfarqB0 aSNzBGN+4zEJkfOQHcnh+PFVQ8gxze0y343E24xB/cMmNU0agXmBdoORTprC44iRohPI k4l/hDjJrNBZubFm98qM0mquA6jZG/nA5mt1d6jXjZbnz7rbdfckNoGDxP4Fhv52WyGt 8ZqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:from:content-language:references:cc:to:subject :user-agent:mime-version:date:message-id:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=KFtJz9RVp457IWDINHeujMGMxTfe7m0UuqKuNpc/14U=; b=gqTHIT0qMk91ltZyG+nExRNIYHTI3pb/PpdNRQt/OHG6KFC3AKm1v3COAMDfilfVEG I2d82ZlQ4HdeNATuRwkklQczl7yYyZI6KEdw0JVVwpIk70ix1B71UpWHU/tztGBGG4GH JGaIDjqs31hwgUWwVENrDERbPwHwz9UMjJL7wt8Jf8Qjra4+SsNM/UsH3yQOKZjecwyM LNbP3CZMJqIYSKyT14KTybwmHUl40FrF7mJ3luOPLsHGV0jvud7kOFH/h4ofJFdPomkN NeLnDgXhC4Nxlb3m17lsdSDUvecBg6XKOOxPhWe+uELNOmKRQm545RbuPigDo3+0Jfuu SdPA== X-Gm-Message-State: AO0yUKXk/nK3NJFh6aov6SDDNbz/rs/EWWV+vnlGp+5irg6Ud5tYCXl9 1Cmv/Iso/wJljyZ5S4kbtag= X-Google-Smtp-Source: AK7set+vHXCSmlUunAyKeq/L43fyD3a19EAJ73ECVCwQLjgj9YXFgDERT9QUNrMVMpdSzvfSDd7Yyg== X-Received: by 2002:a05:6000:1e07:b0:2c7:d7c:7d7 with SMTP id bj7-20020a0560001e0700b002c70d7c07d7mr5733844wrb.22.1677704412169; Wed, 01 Mar 2023 13:00:12 -0800 (PST) Received: from [192.168.0.160] ([170.253.36.171]) by smtp.gmail.com with ESMTPSA id l3-20020a05600012c300b002c5694aef92sm13427310wrx.21.2023.03.01.13.00.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 01 Mar 2023 13:00:11 -0800 (PST) Message-ID: <472f9e40-7259-e7a5-ce5b-c462037cda68@gmail.com> Date: Wed, 1 Mar 2023 22:00:01 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Subject: Re: [PATCH] ptrace.2: Add details about usage of PTRACE_GET_SYSCALL_INFO To: Fotios Valasiadis , linux-man@vger.kernel.org Cc: ldv@strace.io, mtk.manpages@gmail.com, lineprinter0@gmail.com, Nate Eldredge , Alejandro Colomar References: <9f4aaf34-66cc-554f-d45f-73f0bb9b4a94@gmail.com> <20230227191731.15069-1-fvalasiad@gmail.com> Content-Language: en-US From: Alejandro Colomar In-Reply-To: <20230227191731.15069-1-fvalasiad@gmail.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------Yr6CU79FmknA4EqaDzXRduW5" Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------Yr6CU79FmknA4EqaDzXRduW5 Content-Type: multipart/mixed; boundary="------------pKMIvYxukWAKwKHnGQqYuAGr"; protected-headers="v1" From: Alejandro Colomar To: Fotios Valasiadis , linux-man@vger.kernel.org Cc: ldv@strace.io, mtk.manpages@gmail.com, lineprinter0@gmail.com, Nate Eldredge , Alejandro Colomar Message-ID: <472f9e40-7259-e7a5-ce5b-c462037cda68@gmail.com> Subject: Re: [PATCH] ptrace.2: Add details about usage of PTRACE_GET_SYSCALL_INFO References: <9f4aaf34-66cc-554f-d45f-73f0bb9b4a94@gmail.com> <20230227191731.15069-1-fvalasiad@gmail.com> In-Reply-To: <20230227191731.15069-1-fvalasiad@gmail.com> --------------pKMIvYxukWAKwKHnGQqYuAGr Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi Fotios, On 2/27/23 20:19, =CE=A6=CF=8E=CF=84=CE=B7=CF=82 =CE=92=CE=B1=CE=BB=CE=B1= =CF=83=CE=B9=CE=AC=CE=B4=CE=B7=CF=82 wrote: > Hi Alex! >=20 > Is that good enough? >=20 Yep. Patch applied. Thanks! Alex On 2/27/23 20:17, Fotios Valasiadis wrote: > Document the role of PTRACE_O_TRACESYSGOOD option in connection with > PTRACE_GET_SYSCALL_INFO. >=20 > Came upon this after writing a test program using PTRACE_GET_SYSCALL_IN= FO. > After failing to find what's wrong I posted a StackOverflow question > which you can find right here: > >=20 > Nate Eldredge found out what happens by looking into the kernel's sourc= e > code, here is a link to the relevant part > >=20 > In the code it can be seen that in case of system call entry or > exit stops, the union is filled if and only if the signal matches > "SIGTRAP | 0x80", a signal which is only sent if the PTRACE_O_TRACESYSG= OOD > option is set. You can read about that in the PTRACE_O_TRACESYSGOOD > section of ptrace(2)'s manual. >=20 > Complements: fc91449cb "ptrace.2: Document PTRACE_GET_SYSCALL_INFO" > Cowritten-by: Dmitry V. Levin > Signed-off-by: Dmitry V. Levin > Signed-off-by: Fotios Valasiadis > Acked-by: Nate Eldredge > Cc: Elvira Khabirova > Signed-off-by: Alejandro Colomar > --- > man2/ptrace.2 | 9 +++++++++ > 1 file changed, 9 insertions(+) >=20 > diff --git a/man2/ptrace.2 b/man2/ptrace.2 > index 55d9fd36d..9737b3825 100644 > --- a/man2/ptrace.2 > +++ b/man2/ptrace.2 > @@ -1111,6 +1111,15 @@ stop. > .B PTRACE_SYSCALL_INFO_NONE > No component of the union contains relevant information. > .RE > +.IP > +In case of system call entry or exit stops, > +the data returned by > +.B PTRACE_GET_SYSCALL_INFO > +is limited to type > +.B PTRACE_SYSCALL_INFO_NONE > +unless > +.B PTRACE_O_TRACESYSGOOD > +option is set before the corresponding system call stop has occurred. > .\" > .SS Death under ptrace > When a (possibly multithreaded) process receives a killing signal --=20 GPG key fingerprint: A9348594CE31283A826FBDD8D57633D441E25BB5 --------------pKMIvYxukWAKwKHnGQqYuAGr-- --------------Yr6CU79FmknA4EqaDzXRduW5 Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEE6jqH8KTroDDkXfJAnowa+77/2zIFAmP/vNIACgkQnowa+77/ 2zLp0RAAoARRxBjHjxVliYmFoi4JHpBwh4XCanH5/rWEcbc8buFWC2RHV1RbVRCm kBk1e7g1qcUYB6vwxhu1cWO9Oo/5A2GwfuIKt9S/V0XVT18/VEOMAiGfTVA/xShN Y1up4Y6VHsvIjbmlRLTM96cfO3Z93Jw050Ag2ZwdxkoV3gt02Rfo2TqiMef44F4z 5JYK9vroVPbu+aid48gT46YOjwVbtUiTEww3SMMlXYRpzwddsmsm/605PJxvU5YU shaepIbqNW5koDBv0f7gPQhzFGQR5CpwDYFS9Xk1EOMztiqdgAAQbsQoHoETj3ix SeQ3ueqz2NY0/HYY3Wmh0MLc/4K5SjrEFciih7+tjI2HS8BmCq1XHJCmqbHfma0T ZEpdGJgLds0QDhFD+gK4Gm0RQGKOMqS7YsbxIT86kXXd6Luj6mKHGVLh/gTbsH4B vCzaDGlxwUwCGaX6GoX0XvYj8zoNO1OKXs0jOIDj1Dak+eMSten023EQa/rmgCf2 3buPYFkDZSfrIc+LY9uT3GbDFmMR18tYO5wN/16S0AdEvHYgg43W65LLFnAT2HE3 87/quDz8lLqel+BKrniAAk2xR/vbbT5mS8M7E63IdQIffHxpoktnRLMXfjHk1zr/ O8ieQatJnXTd9iZx33TeGnCgU+vtMyjBwKwrS+2Mlk5dWUAU1uI= =UAk1 -----END PGP SIGNATURE----- --------------Yr6CU79FmknA4EqaDzXRduW5--