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rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230038AbhFQRzQ (ORCPT ); Thu, 17 Jun 2021 13:55:16 -0400 Received: from ustc.edu.cn (email6.ustc.edu.cn [IPv6:2001:da8:d800::8]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id C40A9C061574; Thu, 17 Jun 2021 10:53:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mail.ustc.edu.cn; s=dkim; h=Received:Date:From:To:Cc:Subject: Message-ID:In-Reply-To:References:MIME-Version:Content-Type: Content-Transfer-Encoding; bh=IOBrKClZen/HSLrZPFTst8mtCS391FCnHC ONgNtWcDk=; b=onNimX813Mz2KtxuDZj7LlBv5jzacztbkb/1HK9x3a2vX8RcE6 pXz+/KuwpoL9WSYX8DM5Mo/9HHoEIjIyx3+VflLhRIDAf0k08wBa3NXsjw2W3Jhe AFf8aphZt6TKRlju9OOYC/N39RGNLsd8q/iVTDTlA67IcgOayylQcRO2s= Received: from xhacker (unknown [101.86.20.15]) by newmailweb.ustc.edu.cn (Coremail) with SMTP id LkAmygC3vIjfi8tgXif3AA--.5330S2; Fri, 18 Jun 2021 01:52:31 +0800 (CST) Date: Fri, 18 Jun 2021 01:46:48 +0800 From: Jisheng Zhang To: Alex Ghiti Cc: Palmer Dabbelt , schwab@linux-m68k.org, Paul Walmsley , aou@eecs.berkeley.edu, ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, bjorn@kernel.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, luke.r.nels@gmail.com, xi.wang@gmail.com, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, netdev@vger.kernel.org, bpf@vger.kernel.org Subject: Re: [PATCH] riscv: Ensure BPF_JIT_REGION_START aligned with PMD size Message-ID: <20210618014648.1857a62a@xhacker> In-Reply-To: <20210618012731.345657bf@xhacker> References: <50ebc99c-f0a2-b4ea-fc9b-cd93a8324697@ghiti.fr> <20210618012731.345657bf@xhacker> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: LkAmygC3vIjfi8tgXif3AA--.5330S2 X-Coremail-Antispam: 1UD129KBjvJXoWfJr48uF48Ar4DAry8Gw48Zwb_yoWDur18pr 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X-CM-SenderInfo: xmv2xttqjtqzxdloh3xvwfhvlgxou0/ Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 18 Jun 2021 01:27:31 +0800 Jisheng Zhang wrote: > On Thu, 17 Jun 2021 16:18:54 +0200 > Alex Ghiti wrote: >=20 > > Le 17/06/2021 =C3=A0 10:09, Alex Ghiti a =C3=A9crit=C2=A0: =20 > > > Le 17/06/2021 =C3=A0 09:30, Palmer Dabbelt a =C3=A9crit=C2=A0: =20 > > >> On Tue, 15 Jun 2021 17:03:28 PDT (-0700), jszhang3@mail.ustc.edu.cn= =20 > > >> wrote: =20 > > >>> On Tue, 15 Jun 2021 20:54:19 +0200 > > >>> Alex Ghiti wrote: > > >>> =20 > > >>>> Hi Jisheng, =20 > > >>> > > >>> Hi Alex, > > >>> =20 > > >>>> > > >>>> Le 14/06/2021 =C3=A0 18:49, Jisheng Zhang a =C3=A9crit=C2=A0: =20 > > >>>> > From: Jisheng Zhang =20 > > >>>> > > Andreas reported commit fc8504765ec5 ("riscv: bpf: Avoid =20 > > >>>> breaking W^X") =20 > > >>>> > breaks booting with one kind of config file, I reproduced a kern= el =20 > > >>>> panic =20 > > >>>> > with the config: =20 > > >>>> > > [=C2=A0=C2=A0=C2=A0 0.138553] Unable to handle kernel paging r= equest at virtual =20 > > >>>> address ffffffff81201220 =20 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.139159] Oops [#1] > > >>>> > [=C2=A0=C2=A0=C2=A0 0.139303] Modules linked in: > > >>>> > [=C2=A0=C2=A0=C2=A0 0.139601] CPU: 0 PID: 1 Comm: swapper/0 Not = tainted =20 > > >>>> 5.13.0-rc5-default+ #1 =20 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.139934] Hardware name: riscv-virtio,qemu (= DT) > > >>>> > [=C2=A0=C2=A0=C2=A0 0.140193] epc : __memset+0xc4/0xfc > > >>>> > [=C2=A0=C2=A0=C2=A0 0.140416]=C2=A0 ra : skb_flow_dissector_init= +0x1e/0x82 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.140609] epc : ffffffff8029806c ra : ffffff= ff8033be78 sp : =20 > > >>>> ffffffe001647da0 =20 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.140878]=C2=A0 gp : ffffffff81134b08 tp : f= fffffe001654380 t0 : =20 > > >>>> ffffffff81201158 =20 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.141156]=C2=A0 t1 : 0000000000000002 t2 : 0= 000000000000154 s0 : =20 > > >>>> ffffffe001647dd0 =20 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.141424]=C2=A0 s1 : ffffffff80a43250 a0 : f= fffffff81201220 a1 : =20 > > >>>> 0000000000000000 =20 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.141654]=C2=A0 a2 : 000000000000003c a3 : f= fffffff81201258 a4 : =20 > > >>>> 0000000000000064 =20 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.141893]=C2=A0 a5 : ffffffff8029806c a6 : 0= 000000000000040 a7 : =20 > > >>>> ffffffffffffffff =20 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.142126]=C2=A0 s2 : ffffffff81201220 s3 : 0= 000000000000009 s4 : =20 > > >>>> ffffffff81135088 =20 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.142353]=C2=A0 s5 : ffffffff81135038 s6 : f= fffffff8080ce80 s7 : =20 > > >>>> ffffffff80800438 =20 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.142584]=C2=A0 s8 : ffffffff80bc6578 s9 : 0= 000000000000008 s10: =20 > > >>>> ffffffff806000ac =20 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.142810]=C2=A0 s11: 0000000000000000 t3 : f= ffffffffffffffc t4 : =20 > > >>>> 0000000000000000 =20 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.143042]=C2=A0 t5 : 0000000000000155 t6 : 0= 0000000000003ff > > >>>> > [=C2=A0=C2=A0=C2=A0 0.143220] status: 0000000000000120 badaddr: = ffffffff81201220 =20 > > >>>> cause: 000000000000000f =20 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.143560] [] __memset+0xc4= /0xfc > > >>>> > [=C2=A0=C2=A0=C2=A0 0.143859] [] =20 > > >>>> init_default_flow_dissectors+0x22/0x60 =20 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.144092] [] do_one_initca= ll+0x3e/0x168 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.144278] [] kernel_init_f= reeable+0x1c8/0x224 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.144479] [] kernel_init+0= x12/0x110 > > >>>> > [=C2=A0=C2=A0=C2=A0 0.144658] [] ret_from_exce= ption+0x0/0xc > > >>>> > [=C2=A0=C2=A0=C2=A0 0.145124] ---[ end trace f1e9643daa46d591 ]-= -- =20 > > >>>> > > After some investigation, I think I found the root cause: comm= it =20 > > >>>> > 2bfc6cd81bd ("move kernel mapping outside of linear mapping") mo= ves > > >>>> > BPF JIT region after the kernel: =20 > > >>>> > > The &_end is unlikely aligned with PMD size, so the front bpf = jit =20 > > >>>> > region sits with part of kernel .data section in one PMD size = =20 > > >>>> mapping. =20 > > >>>> > But kernel is mapped in PMD SIZE, when bpf_jit_binary_lock_ro() = is > > >>>> > called to make the first bpf jit prog ROX, we will make part of = =20 > > >>>> kernel =20 > > >>>> > .data section RO too, so when we write to, for example memset the > > >>>> > .data section, MMU will trigger a store page fault. =20 > > >>>> Good catch, we make sure no physical allocation happens between _e= nd=20 > > >>>> and the next PMD aligned address, but I missed this one. > > >>>> =20 > > >>>> > > To fix the issue, we need to ensure the BPF JIT region is PMD = size =20 > > >>>> > aligned. This patch acchieve this goal by restoring the BPF JIT = =20 > > >>>> region =20 > > >>>> > to original position, I.E the 128MB before kernel .text section.= =20 > > >>>> But I disagree with your solution: I made sure modules and BPF=20 > > >>>> programs get their own virtual regions to avoid worst case scenari= o=20 > > >>>> where one could allocate all the space and leave nothing to the=20 > > >>>> other (we are limited to +- 2GB offset). Why don't just align=20 > > >>>> BPF_JIT_REGION_START to the next PMD aligned address? =20 > > >>> > > >>> Originally, I planed to fix the issue by aligning=20 > > >>> BPF_JIT_REGION_START, but > > >>> IIRC, BPF experts are adding (or have added) "Calling kernel=20 > > >>> functions from BPF" > > >>> feature, there's a risk that BPF JIT region is beyond the 2GB of=20 > > >>> module region: > > >>> > > >>> ------ > > >>> module > > >>> ------ > > >>> kernel > > >>> ------ > > >>> BPF_JIT > > >>> > > >>> So I made this patch finally. In this patch, we let BPF JIT region = sit > > >>> between module and kernel. > > >>> > > >>> To address "make sure modules and BPF programs get their own virtua= l=20 > > >>> regions", > > >>> what about something as below (applied against this patch)? > > >>> > > >>> diff --git a/arch/riscv/include/asm/pgtable.h=20 > > >>> b/arch/riscv/include/asm/pgtable.h > > >>> index 380cd3a7e548..da1158f10b09 100644 > > >>> --- a/arch/riscv/include/asm/pgtable.h > > >>> +++ b/arch/riscv/include/asm/pgtable.h > > >>> @@ -31,7 +31,7 @@ > > >>> =C2=A0#define BPF_JIT_REGION_SIZE=C2=A0=C2=A0=C2=A0 (SZ_128M) > > >>> =C2=A0#ifdef CONFIG_64BIT > > >>> =C2=A0#define BPF_JIT_REGION_START=C2=A0=C2=A0=C2=A0 (BPF_JIT_REGIO= N_END -=20 > > >>> BPF_JIT_REGION_SIZE) > > >>> -#define BPF_JIT_REGION_END=C2=A0=C2=A0=C2=A0 (MODULES_END) > > >>> +#define BPF_JIT_REGION_END=C2=A0=C2=A0=C2=A0 (PFN_ALIGN((unsigned = long)&_start)) > > >>> =C2=A0#else > > >>> =C2=A0#define BPF_JIT_REGION_START=C2=A0=C2=A0=C2=A0 (PAGE_OFFSET -= BPF_JIT_REGION_SIZE) > > >>> =C2=A0#define BPF_JIT_REGION_END=C2=A0=C2=A0=C2=A0 (VMALLOC_END) > > >>> @@ -40,7 +40,7 @@ > > >>> =C2=A0/* Modules always live before the kernel */ > > >>> =C2=A0#ifdef CONFIG_64BIT > > >>> =C2=A0#define MODULES_VADDR=C2=A0=C2=A0=C2=A0 (PFN_ALIGN((unsigned = long)&_end) - SZ_2G) > > >>> -#define MODULES_END=C2=A0=C2=A0=C2=A0 (PFN_ALIGN((unsigned long)&_= start)) > > >>> +#define MODULES_END=C2=A0=C2=A0=C2=A0 (BPF_JIT_REGION_END) > > >>> =C2=A0#endif > > >>> > > >>> > > >>> =20 > > >>>> > > >>>> Again, good catch, thanks, > > >>>> > > >>>> Alex > > >>>> =20 > > >>>> > > Reported-by: Andreas Schwab =20 > > >>>> > Signed-off-by: Jisheng Zhang > > >>>> > --- > > >>>> >=C2=A0=C2=A0 arch/riscv/include/asm/pgtable.h | 5 ++--- > > >>>> >=C2=A0=C2=A0 1 file changed, 2 insertions(+), 3 deletions(-) =20 > > >>>> > > diff --git a/arch/riscv/include/asm/pgtable.h =20 > > >>>> b/arch/riscv/include/asm/pgtable.h =20 > > >>>> > index 9469f464e71a..380cd3a7e548 100644 > > >>>> > --- a/arch/riscv/include/asm/pgtable.h > > >>>> > +++ b/arch/riscv/include/asm/pgtable.h > > >>>> > @@ -30,9 +30,8 @@ =20 > > >>>> > >=C2=A0=C2=A0 #define BPF_JIT_REGION_SIZE=C2=A0=C2=A0=C2=A0 (SZ_= 128M) =20 > > >>>> >=C2=A0=C2=A0 #ifdef CONFIG_64BIT > > >>>> > -/* KASLR should leave at least 128MB for BPF after the kernel */ > > >>>> > -#define BPF_JIT_REGION_START=C2=A0=C2=A0=C2=A0 PFN_ALIGN((unsig= ned long)&_end) > > >>>> > -#define BPF_JIT_REGION_END=C2=A0=C2=A0=C2=A0 (BPF_JIT_REGION_ST= ART + =20 > > >>>> BPF_JIT_REGION_SIZE) =20 > > >>>> > +#define BPF_JIT_REGION_START=C2=A0=C2=A0=C2=A0 (BPF_JIT_REGION_= END - =20 > > >>>> BPF_JIT_REGION_SIZE) =20 > > >>>> > +#define BPF_JIT_REGION_END=C2=A0=C2=A0=C2=A0 (MODULES_END) > > >>>> >=C2=A0=C2=A0 #else > > >>>> >=C2=A0=C2=A0 #define BPF_JIT_REGION_START=C2=A0=C2=A0=C2=A0 (PAGE= _OFFSET - BPF_JIT_REGION_SIZE) > > >>>> >=C2=A0=C2=A0 #define BPF_JIT_REGION_END=C2=A0=C2=A0=C2=A0 (VMALLO= C_END) > > >>>> > =20 > > >> > > >> This, when applied onto fixes, is breaking early boot on KASAN=20 > > >> configurations for me. =20 >=20 > I can reproduce this issue. >=20 > > >=20 > > > Not surprising, I took a shortcut when initializing KASAN for modules= ,=20 > > > kernel and BPF: > > >=20 > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 kasan_populate(kasan_mem_= to_shadow((const void *)MODULES_VADDR), > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 kasan_me= m_to_shadow((const void=20 > > > *)BPF_JIT_REGION_END)); > > >=20 > > > The kernel is then not covered, I'm taking a look at how to fix that= =20 > > > properly. > > > =20 > >=20 > > The following based on "riscv: Introduce structure that group all=20 > > variables regarding kernel mapping" fixes the issue: > >=20 > > diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c > > index 9daacae93e33..2a45ea909e7f 100644 > > --- a/arch/riscv/mm/kasan_init.c > > +++ b/arch/riscv/mm/kasan_init.c > > @@ -199,9 +199,12 @@ void __init kasan_init(void) > > kasan_populate(kasan_mem_to_shadow(start),=20 > > kasan_mem_to_shadow(end)); > > } > >=20 > > - /* Populate kernel, BPF, modules mapping */ > > + /* Populate BPF and modules mapping: modules mapping encompasse= s=20 > > BPF mapping */ > > kasan_populate(kasan_mem_to_shadow((const void *)MODULES_VADDR= ), > > - kasan_mem_to_shadow((const void=20 > > *)BPF_JIT_REGION_END)); > > + kasan_mem_to_shadow((const void *)MODULES_END)); > > + /* Populate kernel mapping */ > > + kasan_populate(kasan_mem_to_shadow((const void=20 > > *)kernel_map.virt_addr), > > + kasan_mem_to_shadow((const void=20 > > *)kernel_map.virt_addr + kernel_map.size)); > > =20 > If this patch works, maybe we can still use one kasan_populate() to cover > kernel, bpf, and module: >=20 > kasan_populate(kasan_mem_to_shadow((const void *)MODULES_VADDR), > - kasan_mem_to_shadow((const void *)BPF_JIT_REGION_E= ND)); > + kasan_mem_to_shadow((const void *)MODULES_VADDR + = SZ_2G)); >=20 I made a mistake. Below patch works: kasan_populate(kasan_mem_to_shadow((const void *)MODULES_VADDR), - kasan_mem_to_shadow((const void *)BPF_JIT_REGION_END= )); + kasan_mem_to_shadow((const void *)(MODULES_VADDR + S= Z_2G))); > However, both can't solve the early boot hang issue. I'm not sure what's = missing. >=20 > I applied your patch on rc6 + solution below "replace kernel_map.virt_add= r with kernel_virt_addr and > kernel_map.size with load_sz" >=20 >=20 > Thanks > =20 > >=20 > > Without the mentioned patch, replace kernel_map.virt_addr with=20 > > kernel_virt_addr and kernel_map.size with load_sz. Note that load_sz wa= s=20 > > re-exposed in v6 of the patchset "Map the kernel with correct=20 > > permissions the first time". > > =20 >=20 >=20 > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv 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=-13.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 67663C49361 for ; Thu, 17 Jun 2021 17:53:32 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using 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bh=IOBrKClZen/HSLrZPFTst8mtCS391FCnHC ONgNtWcDk=; b=onNimX813Mz2KtxuDZj7LlBv5jzacztbkb/1HK9x3a2vX8RcE6 pXz+/KuwpoL9WSYX8DM5Mo/9HHoEIjIyx3+VflLhRIDAf0k08wBa3NXsjw2W3Jhe AFf8aphZt6TKRlju9OOYC/N39RGNLsd8q/iVTDTlA67IcgOayylQcRO2s= Received: from xhacker (unknown [101.86.20.15]) by newmailweb.ustc.edu.cn (Coremail) with SMTP id LkAmygC3vIjfi8tgXif3AA--.5330S2; Fri, 18 Jun 2021 01:52:31 +0800 (CST) Date: Fri, 18 Jun 2021 01:46:48 +0800 From: Jisheng Zhang To: Alex Ghiti Cc: Palmer Dabbelt , schwab@linux-m68k.org, Paul Walmsley , aou@eecs.berkeley.edu, ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, bjorn@kernel.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, luke.r.nels@gmail.com, xi.wang@gmail.com, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, netdev@vger.kernel.org, bpf@vger.kernel.org Subject: Re: [PATCH] riscv: Ensure BPF_JIT_REGION_START aligned with PMD size Message-ID: <20210618014648.1857a62a@xhacker> In-Reply-To: <20210618012731.345657bf@xhacker> References: <50ebc99c-f0a2-b4ea-fc9b-cd93a8324697@ghiti.fr> <20210618012731.345657bf@xhacker> MIME-Version: 1.0 X-CM-TRANSID: LkAmygC3vIjfi8tgXif3AA--.5330S2 X-Coremail-Antispam: 1UD129KBjvJXoWfJr48uF48Ar4DAry8Gw48Zwb_yoWDur18pr 1kJF43GrWrJr18X342qry5Cryjyw1UAasFqrn8Ja4rJF9rKF1jqr1jqFy3urnFqF48A3W2 yr4DJrZIv345A3DanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUkCb7Iv0xC_Kw4lb4IE77IF4wAFF20E14v26ryj6rWUM7CY07I2 0VC2zVCF04k26cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rw A2F7IY1VAKz4vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Gr0_Xr1l84ACjcxK6xII jxv20xvEc7CjxVAFwI0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVW8Jr0_Cr1UM28EF7xvwV C2z280aVCY1x0267AKxVW8Jr0_Cr1UM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVAC Y4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJV 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