From owner-freebsd-current@freebsd.org Sat Jul 1 20:07:20 2017 Return-Path: Delivered-To: freebsd-current@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 1A9B1D9154A for ; Sat, 1 Jul 2017 20:07:20 +0000 (UTC) (envelope-from alan.l.cox@gmail.com) Received: from mail-it0-x22e.google.com (mail-it0-x22e.google.com [IPv6:2607:f8b0:4001:c0b::22e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id D5F30700B8; Sat, 1 Jul 2017 20:07:19 +0000 (UTC) (envelope-from alan.l.cox@gmail.com) Received: by mail-it0-x22e.google.com with SMTP id m68so74516875ith.1; Sat, 01 Jul 2017 13:07:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:reply-to:in-reply-to:references:from:date:message-id :subject:to:cc; bh=YZYP3QJeHE9p44pq0QO7WvI4cNq7YVkqJg9SQMlUsG0=; b=k3YuwrsdB5mGegfUsngarOs6qP0cgglrW/z77jBza8mbW8bRo6Uh9yK4wD82K+cyaD KBKsC6twTwa152NLCt8YPE4YPhYNYyl46Fc5VgMJA3S8yAa5V5n/x4Olml4iHEZqVPHa Nlv5jzg1GIxY/j4Jl6Uq2xH8HQvPKVGPbdXzXOVEVUDSTeNZa7useHrbpUM4eRxpH8gp mWGNepvQv7Y47vi1DKi+gEhy6e5LOEJ4RDt529K5VJ3aVU4uNqzK+K1MjHwpS7atz1Hc 57rYHyBIhijX3eyM+B9FKe2cz6KNuGcyaAC8DaR3bpPlhpE8+tVpNWDanaF/12uxzPvH o8eg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :from:date:message-id:subject:to:cc; bh=YZYP3QJeHE9p44pq0QO7WvI4cNq7YVkqJg9SQMlUsG0=; b=gZW1RUmk6Ii49IJ/5Tj3bEHlDwWlY7wV5NiAhwq328ih/QIwNcEjEDoG1rzMWhoCcA m67RFjJL4hG8EGHqVlUOk0yUrTSu3asM+6qi3FoGmUhVja717lWdv0vsN8DjJwKNfIs1 Db9IOlLfE5iA9UyRRRhDOAJAFWZ9dSS2v82A6DKt0Yh57yEWLtqck0o04BXSVOQbx2SE Kz0CRDhHuq90OJoum072SJXdWQ5YHjn8Vdggj/r5TcT/QRlz9DQCTDT0HGeMmwqss0ga vIPVGRso/Jao9zgf0mVtkiVle0Su/y2NWjN2a2ob0KLU078T3Uzd13bNULNnLB8sZWpo uuDA== X-Gm-Message-State: AIVw111C1S5t8tZikKpp1nwh+C0pC0XfCpVwMRWuHzvMU+w8kkI21U1R vFpqU128UCEyHRJIZG8eTaJfpXQcYw== X-Received: by 10.36.141.134 with SMTP id w128mr2149563itd.84.1498939639037; Sat, 01 Jul 2017 13:07:19 -0700 (PDT) MIME-Version: 1.0 Received: by 10.79.126.27 with HTTP; Sat, 1 Jul 2017 13:07:18 -0700 (PDT) Reply-To: alc@freebsd.org In-Reply-To: References: From: Alan Cox Date: Sat, 1 Jul 2017 15:07:18 -0500 Message-ID: Subject: Re: running binary in chroot using qemu-arm-static fails to mmap after r320318 To: Guy Yur Cc: freebsd-current , kib@freebsd.org, sbruno@freebsd.org Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.23 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 01 Jul 2017 20:07:20 -0000 On Sat, Jul 1, 2017 at 2:46 PM, Guy Yur wrote: > Hi, > > I tried to run armv6 /bin/sh in a chroot on an > amd64 host using qemu-arm-static. > It failed on invalid argument to mmap. > > # cp /usr/local/bin/qemu-arm-static /chroots/armv6/root/ > # chroot /chroots/armv6 /root/qemu-arm-static /bin/sh > /lib/libedit.so.7: mmap of entire address space failed: Invalid argument > > rtld-elf only passes MAP_GUARD but ktrace shows mmap > is called with MAP_FIXED and MAP_ANON too. > I think qemu-user-static adds the flags in bsd-user/mmap.c target_mmap(). > Does the qemu-user-static port need patching to support MAP_GUARD? > > MAP_ANON should not be passed to mmap(2) at the same time as MAP_GUARD. Passing MAP_FIXED at the same time is okay. > ktrace snipet: > 1072 qemu-arm-static CALL > openat(AT_FDCWD,0xf4ff9020,0x300000) > 1072 qemu-arm-static NAMI "/lib/libc.so.7" > 1072 qemu-arm-static RET openat 3 > 1072 qemu-arm-static CALL fstat(0x3,0x7ffffffe9680) > 1072 qemu-arm-static STRU struct stat {dev=687931144, ino=192007, > mode=0100444, nlink=1, uid=0, gid=0, rdev=1548632, > atime=1498921861.605975000, mtime=1498921861.608547000, > ctime=1498921861.609724000, birthtime=1498921861.605973000, > size=1720888, blksize=32768, blocks=3456, flags=0x20000 } > 1072 qemu-arm-static RET fstat 0 > 1072 qemu-arm-static CALL > mmap(0xf4ff7000,0x1000,0x1,0x41012 PRIVATE|MAP_FIXED|MAP_ANON|MAP_PREFAULT_READ>,0xffffffff,0) > 1072 qemu-arm-static RET mmap 4110381056/0xf4ff7000 > 1072 qemu-arm-static CALL > mmap(0xf4ff7000,0x1000,0x1,0x40012 PREFAULT_READ>,0x3,0) > 1072 qemu-arm-static RET mmap 4110381056/0xf4ff7000 > 1072 qemu-arm-static CALL > mmap(0xf4e37000,0x1c0000,0,0x3010 MAP_ANON|MAP_GUARD>,0xffffffff,0) > 1072 qemu-arm-static RET mmap -1 errno 22 Invalid argument > > Thanks, > Guy > _______________________________________________ > freebsd-current@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" >