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 X-Spam-Level: X-Spam-Status: No, score=-23.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F4152C433DB for ; Fri, 19 Feb 2021 18:55:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 945E864EB1 for ; Fri, 19 Feb 2021 18:55:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229845AbhBSSyl (ORCPT ); Fri, 19 Feb 2021 13:54:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43682 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229546AbhBSSyg (ORCPT ); Fri, 19 Feb 2021 13:54:36 -0500 Received: from mail-qk1-x72c.google.com (mail-qk1-x72c.google.com [IPv6:2607:f8b0:4864:20::72c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6B7EAC061756 for ; Fri, 19 Feb 2021 10:53:55 -0800 (PST) Received: by mail-qk1-x72c.google.com with SMTP id 81so6545217qkf.4 for ; Fri, 19 Feb 2021 10:53:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=y2ldnUb4nw3qm3loSiner0qi237zYJGyc/9RsX2NuUQ=; b=u+XYV0cbX09MEuP7UgTx9MPpmBzHSAF0r+Anbg4Wmz44sTPbPVavuyisA3LAmRQMPs dmyO8OV4A6WMzbHsVeYkGEB40gCl4YzCTP9ul/k+EOR+/yPuCkIMhhwJuqWV/m0LKYIF 2ddcRT5mBYSMaJLoTdzCPZKDepdVGYl/dvivKzP73hGYJaUOXAazRVsfRoUOrS/LrLey cQ+WKWc16h6aQI0mdhSuoM+Jqum75tWxs0M3dpGfk9D+OtAByc/7WF+FYOpeAGg7KOT6 2NsWgimkA/zl/jMGTHsm4Y/b34q/AZxgjOE6ASQTsXgPrmbqYBS5cisthzsYnSfLtIaG gZdg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=y2ldnUb4nw3qm3loSiner0qi237zYJGyc/9RsX2NuUQ=; b=BMOLJ8xQBqIuRYZh41XF8ixSXa042eDzxaFsHszjP6R9l4QtsOMSoXnZKU8w1dS6Oy jGOCsPMT5eMzV/MpdKbvHanVpDFYqSb/Hdhz6t8+9+PMM9E4X2q1GqZrYn1y2CVSy/FR h0QtvRR1AVU5QAk3wcRC96SuZW1zWkD90lDwRtpUDgWSuTIz4sQCNn7tuo7hGN86Z3EL qepk3RkweV69Nm5Q/fs1PzPfd1ki5jiMeNpKq1TYiL/91O77+QUggIi2xWkiOGvamlL/ HjbGbmCKMpGufaeRXYSX8Nc8y6XQpZBfBTkuoPgg4156YWyTm7/f682w4mo0JVSi1I/5 L1Ig== X-Gm-Message-State: AOAM533MF+KYoC9HhKfKK8dV9BzGGUZqO5R4yAk8Zmz2Gj9x9PdjxLOm kDRIc8dKyLmj56+UIc5Ikzp0x0Q0lNO3MZO5nJrpzQ== X-Google-Smtp-Source: ABdhPJxiltfL9a/F8qzqd1yIqTolah1trITzPV/4LTTKfwHzCRS/D0xADfgJPvBgmVj8DjdDbyFECVDHK3QzSMxSJJc= X-Received: by 2002:a05:620a:410f:: with SMTP id j15mr11057203qko.424.1613760834343; Fri, 19 Feb 2021 10:53:54 -0800 (PST) MIME-Version: 1.0 References: <20210118145310.crnqnh6kax5jqicj@distanz.ch> <6e9ee3a1-0e16-b1fc-a690-f1ca8e9823a5@ghiti.fr> <24857bfc-c557-f141-8ae7-2e3da24f67f5@ghiti.fr> <957f09fb-84f4-2e0a-13ab-f7e4831ee7d0@ghiti.fr> <31dfbbbf-79ff-1204-2e9d-dc62630acd36@ghiti.fr> In-Reply-To: <31dfbbbf-79ff-1204-2e9d-dc62630acd36@ghiti.fr> From: Dmitry Vyukov Date: Fri, 19 Feb 2021 19:53:43 +0100 Message-ID: Subject: Re: riscv+KASAN does not boot To: Alex Ghiti Cc: Albert Ou , Bjorn Topel , Palmer Dabbelt , LKML , nylon7@andestech.com, syzkaller , Andreas Schwab , Paul Walmsley , Tobias Klauser , linux-riscv Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Feb 19, 2021 at 6:01 PM Alex Ghiti wrote: > > Hi Dmitry, > > Le 2/18/21 =C3=A0 6:36 AM, Dmitry Vyukov a =C3=A9crit : > > On Thu, Feb 18, 2021 at 8:54 AM Alex Ghiti wrote: > >> > >> Hi Dmitry, > >> > >>> On Wed, Feb 17, 2021 at 5:36 PM Alex Ghiti wrote: > >>>> > >>>> Le 2/16/21 =C3=A0 11:42 PM, Dmitry Vyukov a =C3=A9crit : > >>>>> On Tue, Feb 16, 2021 at 9:42 PM Alex Ghiti wrote: > >>>>>> > >>>>>> Hi Dmitry, > >>>>>> > >>>>>> Le 2/16/21 =C3=A0 6:25 AM, Dmitry Vyukov a =C3=A9crit : > >>>>>>> On Tue, Feb 16, 2021 at 12:17 PM Dmitry Vyukov wrote: > >>>>>>>> > >>>>>>>> On Fri, Jan 29, 2021 at 9:11 AM Dmitry Vyukov wrote: > >>>>>>>>>> I was fixing KASAN support for my sv48 patchset so I took a lo= ok at your > >>>>>>>>>> issue: I built a kernel on top of the branch riscv/fixes using > >>>>>>>>>> https://github.com/google/syzkaller/blob/269d24e857a757d09a898= 086a2fa6fa5d827c3e1/dashboard/config/linux/upstream-riscv64-kasan.config > >>>>>>>>>> and Buildroot 2020.11. I have the warnings regarding the use o= f > >>>>>>>>>> __virt_to_phys on wrong addresses (but that's normal since thi= s function > >>>>>>>>>> is used in virt_addr_valid) but not the segfaults you describe= . > >>>>>>>>> > >>>>>>>>> Hi Alex, > >>>>>>>>> > >>>>>>>>> Let me try to rebuild buildroot image. Maybe there was somethin= g wrong > >>>>>>>>> with my build, though, I did 'make clean' before doing. But at = the > >>>>>>>>> same time it worked back in June... > >>>>>>>>> > >>>>>>>>> Re WARNINGs, they indicate kernel bugs. I am working on setting= up a > >>>>>>>>> syzbot instance on riscv. If there a WARNING during boot then t= he > >>>>>>>>> kernel will be marked as broken. No further testing will happen= . > >>>>>>>>> Is it a mis-use of WARN_ON? If so, could anybody please remove = it or > >>>>>>>>> replace it with pr_err. > >>>>>>>> > >>>>>>>> > >>>>>>>> Hi, > >>>>>>>> > >>>>>>>> I've localized one issue with riscv/KASAN: > >>>>>>>> KASAN breaks VDSO and that's I think the root cause of weird fau= lts I > >>>>>>>> saw earlier. The following patch fixes it. > >>>>>>>> Could somebody please upstream this fix? I don't know how to add= /run > >>>>>>>> tests for this. > >>>>>>>> Thanks > >>>>>>>> > >>>>>>>> diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel= /vdso/Makefile > >>>>>>>> index 0cfd6da784f84..cf3a383c1799d 100644 > >>>>>>>> --- a/arch/riscv/kernel/vdso/Makefile > >>>>>>>> +++ b/arch/riscv/kernel/vdso/Makefile > >>>>>>>> @@ -35,6 +35,7 @@ CFLAGS_REMOVE_vgettimeofday.o =3D $(CC_FLAGS_F= TRACE) -Os > >>>>>>>> # Disable gcov profiling for VDSO code > >>>>>>>> GCOV_PROFILE :=3D n > >>>>>>>> KCOV_INSTRUMENT :=3D n > >>>>>>>> +KASAN_SANITIZE :=3D n > >>>>>>>> > >>>>>>>> # Force dependency > >>>>>>>> $(obj)/vdso.o: $(obj)/vdso.so > >>>>>> > >>>>>> What's weird is that I don't have any issue without this patch wit= h the > >>>>>> following config whereas it indeed seems required for KASAN. But w= hen > >>>>>> looking at the segfaults you got earlier, the segfault address is = 0xbb0 > >>>>>> and the cause is an instruction page fault: this address is the PL= T base > >>>>>> address in vdso.so and an instruction page fault would mean that s= omeone > >>>>>> tried to jump at this address, which is weird. At first sight, tha= t does > >>>>>> not seem related to your patch above, but clearly I may be wrong. > >>>>>> > >>>>>> Tobias, did you observe the same segfaults as Dmitry ? > >>>>> > >>>>> > >>>>> I noticed that not all buildroot images use VDSO, it seems to be > >>>>> dependent on libc settings (at least I think I changed it in the > >>>>> past). > >>>> > >>>> Ok, I used uClibc but then when using glibc, I have the same segfaul= ts, > >>>> only when KASAN is enabled. And your patch fixes the problem. I will= try > >>>> to take a look later to better understand the problem. > >>>> > >>>>> I also booted an image completely successfully including dhcpd/sshd > >>>>> start, but then my executable crashed in clock_gettime. The executa= ble > >>>>> was build on linux/amd64 host with "riscv64-linux-gnu-gcc -static" > >>>>> (10.2.1). > >>>>> > >>>>> > >>>>>>> Second issue I am seeing seems to be related to text segment size= . > >>>>>>> I check out v5.11 and use this config: > >>>>>>> https://gist.github.com/dvyukov/6af25474d455437577a84213b0cc9178 > >>>>>> > >>>>>> This config gave my laptop a hard time ! Finally I was able to boo= t > >>>>>> correctly to userspace, but I realized I used my sv48 branch...Eit= her I > >>>>>> fixed your issue along the way or I can't reproduce it, I'll give = it a > >>>>>> try tomorrow. > >>>>> > >>>>> Where is your branch? I could also test in my setup on your branch. > >>>>> > >>>> > >>>> You can find my branch int/alex/riscv_kernel_end_of_address_space_v2 > >>>> here: https://github.com/AlexGhiti/riscv-linux.git > >>> > >>> No, it does not work for me. > >>> > >>> Source is on b61ab6c98de021398cd7734ea5fc3655e51e70f2 (HEAD, > >>> int/alex/riscv_kernel_end_of_address_space_v2) > >>> Config is https://gist.githubusercontent.com/dvyukov/6af25474d4554375= 77a84213b0cc9178/raw/55b116522c14a8a98a7626d76df740d54f648ce5/gistfile1.txt > >>> > >>> riscv64-linux-gnu-gcc -v > >>> gcc version 10.2.1 20210110 (Debian 10.2.1-6+build1) > >>> > >>> qemu-system-riscv64 --version > >>> QEMU emulator version 5.2.0 (Debian 1:5.2+dfsg-3) > >>> > >>> qemu-system-riscv64 \ > >>> -machine virt -smp 2 -m 2G \ > >>> -device virtio-blk-device,drive=3Dhd0 \ > >>> -drive file=3Dimage-riscv64,if=3Dnone,format=3Draw,id=3Dhd0 \ > >>> -kernel arch/riscv/boot/Image \ > >>> -nographic \ > >>> -device virtio-rng-device,rng=3Drng0 -object > >>> rng-random,filename=3D/dev/urandom,id=3Drng0 \ > >>> -netdev user,id=3Dnet0,host=3D10.0.2.10,hostfwd=3Dtcp::10022-:22 -dev= ice > >>> virtio-net-device,netdev=3Dnet0 \ > >>> -append "root=3D/dev/vda earlyprintk=3Dserial console=3DttyS0 oops=3D= panic > >>> panic_on_warn=3D1 panic=3D86400 earlycon" > >> > >> It still works for me but I had to disable CONFIG_DEBUG_INFO_BTF (I > >> don't think that changes anything at runtime). But your above command > >> line does not work for me as it appears you do not load any firmware, = if > >> I add -bios images/fw_jump.elf, it works. But then I don't know where > >> your opensbi output below comes from... > >> > >> And regarding your issue with calling clock_gettime 'directly' compare= d > >> to using the syscall, I have the same consistent output from both call= s. > >> > >> I have an older gcc (9.3.0) and the same qemu. I think what is missing > >> here is your buildroot config, so that we have the exact same > >> environment: could you post your buildroot config as well ? > > > > I don't think the image is relevant because I don't even get to kernel > > code. If the kernel will complain about no init later, that's fine. > > Re bios, this version of qemu already has OpenSBI bios builtin, you > > can pass -bios default, but that's, well, the default :) > > Here are more reproducible repro instructions that capture gcc and > > qemu. I think gcc version may be potentially relevant as I suspect > > code size. > > > > > > curl https://gist.githubusercontent.com/dvyukov/6af25474d455437577a8421= 3b0cc9178/raw/55b116522c14a8a98a7626d76df740d54f648ce5/gistfile1.txt > >> $KERNEL_SRC/.config > > docker pull gcr.io/syzkaller/syzbot > > docker run -it -v $KERNEL_SRC:/kernel gcr.io/syzkaller/syzbot > > cd /kernel > > make -j72 ARCH=3Driscv CROSS_COMPILE=3Driscv64-linux-gnu- olddefconfig > > make -j72 ARCH=3Driscv CROSS_COMPILE=3Driscv64-linux-gnu- > > qemu-system-riscv64 -machine virt -smp 2 -m 4G -kernel > > arch/riscv/boot/Image -nographic -append "earlycon earlyprintk=3Dserial > > console=3DttyS0" > > [this does not, only OpenSBI output] > > > > Indeed the issue was code size, please find the fix below. I will send a > proper patch once I made sure the fix is the right one, but I'm pretty > confident, there's no reason to limit the mapping size to 128MB whereas > we have a whole pgdir. Great you get to the bottom of this! Riscv kernels are going to be YUGE! > diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c > index 9b0592b11a9f..ff2495707edb 100644 > --- a/arch/riscv/mm/init.c > +++ b/arch/riscv/mm/init.c > @@ -287,7 +287,7 @@ pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss= ; > pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss; > pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; > > -#define MAX_EARLY_MAPPING_SIZE SZ_128M > +#define MAX_EARLY_MAPPING_SIZE PGDIR_SIZE > > pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); > > -- > 2.20.1 > > Thanks, > > Alex > > > scripts/config -d KASAN_INLINE -e KASAN_OUTLINE -d > > CC_OPTIMIZE_FOR_PERFORMANCE -e CC_OPTIMIZE_FOR_SIZE > > make -j72 ARCH=3Driscv CROSS_COMPILE=3Driscv64-linux-gnu- > > qemu-system-riscv64 -machine virt -smp 2 -m 4G -kernel > > arch/riscv/boot/Image -nographic -append "earlycon earlyprintk=3Dserial > > console=3DttyS0" > > [this boots fine, at least at to starting init process] > > > > 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AOAM533chD8QvwudZhmkaMytQJjyV7pT77cB5Rg6i25VFfFyn0p6HaB3 RY9+EC+5oA0IGmKr7xp3zEoVnK9p+Pxrebad/CWM/Q== X-Google-Smtp-Source: ABdhPJxiltfL9a/F8qzqd1yIqTolah1trITzPV/4LTTKfwHzCRS/D0xADfgJPvBgmVj8DjdDbyFECVDHK3QzSMxSJJc= X-Received: by 2002:a05:620a:410f:: with SMTP id j15mr11057203qko.424.1613760834343; Fri, 19 Feb 2021 10:53:54 -0800 (PST) MIME-Version: 1.0 References: <20210118145310.crnqnh6kax5jqicj@distanz.ch> <6e9ee3a1-0e16-b1fc-a690-f1ca8e9823a5@ghiti.fr> <24857bfc-c557-f141-8ae7-2e3da24f67f5@ghiti.fr> <957f09fb-84f4-2e0a-13ab-f7e4831ee7d0@ghiti.fr> <31dfbbbf-79ff-1204-2e9d-dc62630acd36@ghiti.fr> In-Reply-To: <31dfbbbf-79ff-1204-2e9d-dc62630acd36@ghiti.fr> From: Dmitry Vyukov Date: Fri, 19 Feb 2021 19:53:43 +0100 Message-ID: Subject: Re: riscv+KASAN does not boot To: Alex Ghiti X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210219_135358_549272_6546D97A X-CRM114-Status: GOOD ( 49.93 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Albert Ou , Bjorn Topel , Palmer Dabbelt , LKML , nylon7@andestech.com, syzkaller , Andreas Schwab , Paul Walmsley , Tobias Klauser , linux-riscv Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gRnJpLCBGZWIgMTksIDIwMjEgYXQgNjowMSBQTSBBbGV4IEdoaXRpIDxhbGV4QGdoaXRpLmZy PiB3cm90ZToKPgo+IEhpIERtaXRyeSwKPgo+IExlIDIvMTgvMjEgw6AgNjozNiBBTSwgRG1pdHJ5 IFZ5dWtvdiBhIMOpY3JpdCA6Cj4gPiBPbiBUaHUsIEZlYiAxOCwgMjAyMSBhdCA4OjU0IEFNIEFs ZXggR2hpdGkgPGFsZXhAZ2hpdGkuZnI+IHdyb3RlOgo+ID4+Cj4gPj4gSGkgRG1pdHJ5LAo+ID4+ Cj4gPj4+IE9uIFdlZCwgRmViIDE3LCAyMDIxIGF0IDU6MzYgUE0gQWxleCBHaGl0aSA8YWxleEBn aGl0aS5mcj4gd3JvdGU6Cj4gPj4+Pgo+ID4+Pj4gTGUgMi8xNi8yMSDDoCAxMTo0MiBQTSwgRG1p dHJ5IFZ5dWtvdiBhIMOpY3JpdCA6Cj4gPj4+Pj4gT24gVHVlLCBGZWIgMTYsIDIwMjEgYXQgOTo0 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