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=-10.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 B8EFAC48BE5 for ; Fri, 11 Jun 2021 16:30:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 95DFD60D07 for ; Fri, 11 Jun 2021 16:30:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230393AbhFKQcY (ORCPT ); Fri, 11 Jun 2021 12:32:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53120 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229540AbhFKQcW (ORCPT ); Fri, 11 Jun 2021 12:32:22 -0400 Received: from ustc.edu.cn (email6.ustc.edu.cn [IPv6:2001:da8:d800::8]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 5392DC061574; Fri, 11 Jun 2021 09:30:22 -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=loSuEwYH2/ErgrOv9smUX/ZtX7NHKWXh5V A17UsKWAU=; b=NhVTjKTko9VU+2hpWcEKNxkXl/V9ag7IK34UxjNgAagISWU0Mx jJAXOvmiCoLLVYWeTIbEDCIDe1X3fRvA2KApx0kpHJDJUadnCMmfDyAWo2b8KxfG /MgAXtiX1Px1GrwUa2mdpTqlFEUytrLqXxlnBCXMd3QBm1LZztIPXbaEo= Received: from xhacker (unknown [101.86.20.15]) by newmailweb.ustc.edu.cn (Coremail) with SMTP id LkAmygCHj1tUj8NgA0LIAA--.30112S2; Sat, 12 Jun 2021 00:29:09 +0800 (CST) Date: Sat, 12 Jun 2021 00:23:34 +0800 From: Jisheng Zhang To: Andreas Schwab Cc: Paul Walmsley , Palmer Dabbelt , Albert Ou , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Luke Nelson , Xi Wang , 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 7/9] riscv: bpf: Avoid breaking W^X Message-ID: <20210612002334.6af72545@xhacker> In-Reply-To: <87o8ccqypw.fsf@igel.home> References: <20210330022144.150edc6e@xhacker> <20210330022521.2a904a8c@xhacker> <87o8ccqypw.fsf@igel.home> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: LkAmygCHj1tUj8NgA0LIAA--.30112S2 X-Coremail-Antispam: 1UD129KBjvJXoW3AFy3KryxZr4UJr1rCw13CFg_yoW7Wr47pr 4UAr1UGr48tr1UJr18Cr15AF1UAr1UAa13JFnrJrZ5J3WUWw1DJr18JrW7CF1DGr1rJF17 tr1DXr48tr1DGaUanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUkCb7Iv0xC_Kw4lb4IE77IF4wAFF20E14v26ryj6rWUM7CY07I2 0VC2zVCF04k26cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rw A2F7IY1VAKz4vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xII jxv20xvEc7CjxVAFwI0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIE14v26F4j6r4UJwA2z4x0Y4 vEx4A2jsIEc7CjxVAFwI0_Gr1j6F4UJwAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40E FcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr 0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcVAKI48JM4IIrI8v6xkF7I0E8cxan2IY 04v7MxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI 0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVW8ZVWrXwCIc40Y 0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxV W8JVWxJwCI42IY6xAIw20EY4v20xvaj40_WFyUJVCq3wCI42IY6I8E87Iv67AKxVWUJVW8 JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxUg0D7DU UUU X-CM-SenderInfo: xmv2xttqjtqzxdloh3xvwfhvlgxou0/ Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Andreas, On Fri, 11 Jun 2021 16:10:03 +0200 Andreas Schwab wrote: > On M=C3=A4r 30 2021, Jisheng Zhang wrote: >=20 > > From: Jisheng Zhang > > > > We allocate Non-executable pages, then call bpf_jit_binary_lock_ro() > > to enable executable permission after mapping them read-only. This is > > to prepare for STRICT_MODULE_RWX in following patch. =20 >=20 > That breaks booting with > . >=20 Thanks for the bug report. I reproduced an kernel panic with the defconfig on qemu, but I'm not sure w= hether this is the issue you saw, I will check. 0.161959] futex hash table entries: 512 (order: 3, 32768 bytes, linear) [ 0.167028] pinctrl core: initialized pinctrl subsystem [ 0.190727] Unable to handle kernel paging request at virtual address ff= ffffff81651bd8 [ 0.191361] Oops [#1] [ 0.191509] Modules linked in: [ 0.191814] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.13.0-rc5-default= + #3 [ 0.192179] Hardware name: riscv-virtio,qemu (DT) [ 0.192492] epc : __memset+0xc4/0xfc [ 0.192712] ra : skb_flow_dissector_init+0x22/0x86 [ 0.192915] epc : ffffffff803e2700 ra : ffffffff8058f90c sp : ffffffe001= a4fda0 [ 0.193221] gp : ffffffff8156d120 tp : ffffffe001a5b700 t0 : ffffffff81= 651b10 [ 0.193631] t1 : 0000000000000100 t2 : 00000000000003a8 s0 : ffffffe001= a4fdd0 [ 0.194034] s1 : ffffffff80c9e250 a0 : ffffffff81651bd8 a1 : 0000000000= 000000 [ 0.194502] a2 : 000000000000003c a3 : ffffffff81651c10 a4 : 0000000000= 000064 [ 0.195053] a5 : ffffffff803e2700 a6 : 0000000000000040 a7 : 0000000000= 000002 [ 0.195436] s2 : ffffffff81651bd8 s3 : 0000000000000009 s4 : ffffffff81= 56e0c8 [ 0.195723] s5 : ffffffff8156e050 s6 : ffffffff80a105e0 s7 : ffffffff80= a00738 [ 0.195992] s8 : ffffffff80f07be0 s9 : 0000000000000008 s10: ffffffff80= 8000ac [ 0.196257] s11: 0000000000000000 t3 : fffffffffffffffc t4 : 0000000000= 000000 [ 0.196511] t5 : 00000000000003a9 t6 : 00000000000003ff [ 0.196714] status: 0000000000000120 badaddr: ffffffff81651bd8 cause: 00= 0000000000000f [ 0.197103] [] __memset+0xc4/0xfc [ 0.197408] [] init_default_flow_dissectors+0x22/0x60 [ 0.197693] [] do_one_initcall+0x3e/0x168 [ 0.197907] [] kernel_init_freeable+0x25a/0x2c6 [ 0.198157] [] kernel_init+0x12/0x110 [ 0.198351] [] ret_from_exception+0x0/0xc [ 0.198973] Unable to handle kernel paging request at virtual address ff= ffffff8164d860 [ 0.199242] Oops [#2] [ 0.199336] Modules linked in: [ 0.199514] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G D 5.= 13.0-rc5-default+ #3 [ 0.199785] Hardware name: riscv-virtio,qemu (DT) [ 0.199940] epc : _raw_spin_lock_irqsave+0x14/0x4e [ 0.200113] ra : _extract_crng+0x58/0xac [ 0.200264] epc : ffffffff807117ae ra : ffffffff80490774 sp : ffffffe001= a4fa70 [ 0.200489] gp : ffffffff8156d120 tp : ffffffe001a5b700 t0 : ffffffff81= 57c0d7 [ 0.200715] t1 : ffffffff8157c0c8 t2 : 0000000000000000 s0 : ffffffe001= a4fa80 [ 0.200938] s1 : ffffffff8164d818 a0 : 0000000000000022 a1 : ffffffe001= a4fac8 [ 0.201166] a2 : 0000000000000010 a3 : 0000000000000001 a4 : ffffffff81= 64d860 [ 0.201389] a5 : 0000000000000000 a6 : c0000000ffffdfff a7 : ffffffffff= ffffff [ 0.201612] s2 : ffffffff8156e1c0 s3 : ffffffe001a4fac8 s4 : ffffffff81= 64d860 [ 0.201836] s5 : ffffffff8156e0c8 s6 : ffffffff80a105e0 s7 : ffffffff80= a00738 [ 0.202060] s8 : ffffffff80f07be0 s9 : 0000000000000008 s10: ffffffff80= 8000ac [ 0.202295] s11: 0000000000000000 t3 : 000000000000005b t4 : ffffffffff= ffffff [ 0.202519] t5 : 00000000000003a9 t6 : ffffffe001a4f9b8 [ 0.202691] status: 0000000000000100 badaddr: ffffffff8164d860 cause: 00= 0000000000000f [ 0.202940] [] _raw_spin_lock_irqsave+0x14/0x4e [ 0.203326] Unable to handle kernel paging request at virtual address ff= ffffff8164d860 [ 0.203574] Oops [#3] [ 0.203664] Modules linked in: [ 0.203784] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G D 5.= 13.0-rc5-default+ #3 [ 0.204046] Hardware name: riscv-virtio,qemu (DT) [ 0.204201] epc : _raw_spin_lock_irqsave+0x14/0x4e [ 0.204371] ra : _extract_crng+0x58/0xac [ 0.204519] epc : ffffffff807117ae ra : ffffffff80490774 sp : ffffffe001= a4f740 [ 0.204819] gp : ffffffff8156d120 tp : ffffffe001a5b700 t0 : ffffffff81= 57c0d7 [ 0.205089] t1 : ffffffff8157c0c8 t2 : 0000000000000000 s0 : ffffffe001= a4f750 [ 0.205330] s1 : ffffffff8164d818 a0 : 0000000000000102 a1 : ffffffe001= a4f798 [ 0.205553] a2 : 0000000000000010 a3 : 0000000000000001 a4 : ffffffff81= 64d860 [ 0.205768] a5 : 0000000000000000 a6 : c0000000ffffdfff a7 : ffffffff81= 408a40 [ 0.205981] s2 : ffffffff8156e1c0 s3 : ffffffe001a4f798 s4 : ffffffff81= 64d860 [ 0.206197] s5 : ffffffff8156e0c8 s6 : ffffffff80a105e0 s7 : ffffffff80= a00738 [ 0.206411] s8 : ffffffff80f07be0 s9 : 0000000000000008 s10: ffffffff80= 8000ac [ 0.206633] s11: 0000000000000000 t3 : 000000000000005b t4 : ffffffffff= ffffff [ 0.206849] t5 : 00000000000003a9 t6 : ffffffe001a4f688 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=-8.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,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 B3780C48BD1 for ; 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bh=loSuEwYH2/ErgrOv9smUX/ZtX7NHKWXh5V A17UsKWAU=; b=NhVTjKTko9VU+2hpWcEKNxkXl/V9ag7IK34UxjNgAagISWU0Mx jJAXOvmiCoLLVYWeTIbEDCIDe1X3fRvA2KApx0kpHJDJUadnCMmfDyAWo2b8KxfG /MgAXtiX1Px1GrwUa2mdpTqlFEUytrLqXxlnBCXMd3QBm1LZztIPXbaEo= Received: from xhacker (unknown [101.86.20.15]) by newmailweb.ustc.edu.cn (Coremail) with SMTP id LkAmygCHj1tUj8NgA0LIAA--.30112S2; Sat, 12 Jun 2021 00:29:09 +0800 (CST) Date: Sat, 12 Jun 2021 00:23:34 +0800 From: Jisheng Zhang To: Andreas Schwab Cc: Paul Walmsley , Palmer Dabbelt , Albert Ou , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Luke Nelson , Xi Wang , 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 7/9] riscv: bpf: Avoid breaking W^X Message-ID: <20210612002334.6af72545@xhacker> In-Reply-To: <87o8ccqypw.fsf@igel.home> References: <20210330022144.150edc6e@xhacker> <20210330022521.2a904a8c@xhacker> <87o8ccqypw.fsf@igel.home> MIME-Version: 1.0 X-CM-TRANSID: LkAmygCHj1tUj8NgA0LIAA--.30112S2 X-Coremail-Antispam: 1UD129KBjvJXoW3AFy3KryxZr4UJr1rCw13CFg_yoW7Wr47pr 4UAr1UGr48tr1UJr18Cr15AF1UAr1UAa13JFnrJrZ5J3WUWw1DJr18JrW7CF1DGr1rJF17 tr1DXr48tr1DGaUanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUkCb7Iv0xC_Kw4lb4IE77IF4wAFF20E14v26ryj6rWUM7CY07I2 0VC2zVCF04k26cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rw A2F7IY1VAKz4vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xII jxv20xvEc7CjxVAFwI0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIE14v26F4j6r4UJwA2z4x0Y4 vEx4A2jsIEc7CjxVAFwI0_Gr1j6F4UJwAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40E FcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr 0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcVAKI48JM4IIrI8v6xkF7I0E8cxan2IY 04v7MxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI 0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVW8ZVWrXwCIc40Y 0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxV W8JVWxJwCI42IY6xAIw20EY4v20xvaj40_WFyUJVCq3wCI42IY6I8E87Iv67AKxVWUJVW8 JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxUg0D7DU UUU X-CM-SenderInfo: xmv2xttqjtqzxdloh3xvwfhvlgxou0/ X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210611_093014_457590_F4BF7F5D X-CRM114-Status: UNSURE ( 9.61 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 SGkgQW5kcmVhcywKCk9uIEZyaSwgMTEgSnVuIDIwMjEgMTY6MTA6MDMgKzAyMDAKQW5kcmVhcyBT Y2h3YWIgPHNjaHdhYkBsaW51eC1tNjhrLm9yZz4gd3JvdGU6Cgo+IE9uIE3DpHIgMzAgMjAyMSwg SmlzaGVuZyBaaGFuZyB3cm90ZToKPiAKPiA+IEZyb206IEppc2hlbmcgWmhhbmcgPGpzemhhbmdA a2VybmVsLm9yZz4KPiA+Cj4gPiBXZSBhbGxvY2F0ZSBOb24tZXhlY3V0YWJsZSBwYWdlcywgdGhl biBjYWxsIGJwZl9qaXRfYmluYXJ5X2xvY2tfcm8oKQo+ID4gdG8gZW5hYmxlIGV4ZWN1dGFibGUg cGVybWlzc2lvbiBhZnRlciBtYXBwaW5nIHRoZW0gcmVhZC1vbmx5LiBUaGlzIGlzCj4gPiB0byBw cmVwYXJlIGZvciBTVFJJQ1RfTU9EVUxFX1JXWCBpbiBmb2xsb3dpbmcgcGF0Y2guICAKPiAKPiBU aGF0IGJyZWFrcyBib290aW5nIHdpdGgKPiA8aHR0cHM6Ly9naXRodWIuY29tL29wZW5TVVNFL2tl 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