From nobody Sun Jul 2 13:49:47 2023 X-Original-To: bugs@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4Qv9R02TMhz4lcNv for ; Sun, 2 Jul 2023 13:49:48 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (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 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Qv9Qz6cqrz3xTv for ; Sun, 2 Jul 2023 13:49:47 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1688305787; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=gNllo1If3GGUCrERjZPBN43RJAVl+RNxYK0M8T5d6ps=; b=BLSuzFTlb8DS+2acRbJLmiuPbnKyYSb5V9syRomZwgJPIMeSobDFwJcPDpdzQpCyPxX8Qm G2SjM78tYAQWGevbrptHN0FEBL7rns35v8ci3PNu2ikOIITHiACacVJyXk4SZ8mVpm907y FVrwsSWKJoQD/AAS0YBrUJHuWbdx4nkE2qQNGzyiJ8iKbl5BC9RN0feOhhWj54iRNpWzQg xE8o59+MvFt+5zt6trCAEfRHSlG/lwZ6kChm0mm/+OSeG1zR2LQRTS54UERIfHfbOwpKX/ x04S607l/ZGZLsDuPk/FNaW9PQIg/UKqNjua/p6gQVJytCZ95Xxj24jiPXbEzQ== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1688305787; a=rsa-sha256; cv=none; b=Dv4YmktiGbIj+Q8ZATKC6oAO+HbGBTKf9xghD0bI0EjA2VXJdo6Cr3VC1tTTDO5JCNrLnG JBnN6wSOOZdiBu3b+EnRZcg60OBoatY5LS5fipldJqYJn9LUQINgkeA/RAM/9P3HAG02dv QVT/Pz8Lr3mwpJoVXJHbgOUBVNZ510kTlasrffP6AnLAqwoE3VDNPDH78z0GIghwr1Fl1v Pe0qy7OM7Z1ICabhy9cMKZ7MI8R4z89cYFXAniE4hk0H9C+i05MX7tsXWxzO/+LwDj+WHM T6WRiYeEG7hc5J8E3nF/pMpbGlLjFFucHoltY4KLFzB7+gFF7nNR3lGJDIqhug== Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (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) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 4Qv9Qz5jfZz19ZD for ; Sun, 2 Jul 2023 13:49:47 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 362DnlQr000308 for ; Sun, 2 Jul 2023 13:49:47 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 362Dnlcl000307 for bugs@FreeBSD.org; Sun, 2 Jul 2023 13:49:47 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 272332] pipebomb: kern.ipc.maxpipekva exceeded Date: Sun, 02 Jul 2023 13:49:47 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 13.2-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: koston@iki.fi X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter attachments.mimetype attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Bug reports List-Archive: https://lists.freebsd.org/archives/freebsd-bugs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-bugs@freebsd.org MIME-Version: 1.0 X-ThisMailContainsUnwantedMimeParts: N https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D272332 Bug ID: 272332 Summary: pipebomb: kern.ipc.maxpipekva exceeded Product: Base System Version: 13.2-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: koston@iki.fi Attachment #243133 text/plain mime type: Created attachment 243133 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D243133&action= =3Dedit pipe() bomb kern.ipc.maxpipekva sets hard limit on kernel address space allocated to mapping pipe buffers. Exceeding this limit causes pipe() return -1 and "kern.ipc.maxpipekva exceeded" message, as it should. This causes a local denial of service, if the pipe() failure is ignored. Th= is can happen due to buggy software (as it did in my case), or it can be trivi= ally triggered by a malicious local user. Regardless, it is a pain to deal with,= if the offending process doesn't voluntarily give up on it's bad manners. The kernel is already capable and willing to forcibly terminate a process, which has exhausted system memory capacity. Should it do the same for a pro= cess exhausting pipe buffers? Attached C code demonstrating the issue. --=20 You are receiving this mail because: You are the assignee for the bug.=