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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id D8C71C61D85 for ; Tue, 21 Nov 2023 17:13:42 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 72DD06B04BD; Tue, 21 Nov 2023 12:13:42 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 6B7BC6B04BE; Tue, 21 Nov 2023 12:13:42 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 557116B04BF; Tue, 21 Nov 2023 12:13:42 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 3FEB36B04BD for ; Tue, 21 Nov 2023 12:13:42 -0500 (EST) Received: from smtpin26.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 1ACB8120A10 for ; Tue, 21 Nov 2023 17:13:42 +0000 (UTC) X-FDA: 81482608284.26.90CF60F Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by imf25.hostedemail.com (Postfix) with ESMTP id 31701A000A for ; Tue, 21 Nov 2023 17:13:39 +0000 (UTC) Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=linutronix.de header.s=2020 header.b=yKoRbjsw; dkim=pass header.d=linutronix.de header.s=2020e header.b=i837O3Jj; dmarc=pass (policy=none) header.from=linutronix.de; spf=pass (imf25.hostedemail.com: domain of tglx@linutronix.de designates 193.142.43.55 as permitted sender) smtp.mailfrom=tglx@linutronix.de ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1700586820; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=I1cohRsqh/gMhQXdMjmF/EuQWloEkKiFSISrxy+k+Yc=; b=X9FZgXPuyvlmxt1QY3qKpRPoF41xu+CtLWdw8LgX7sW0oVT4+vWy34d1eApaRU6YYgxDaO T/USETdaNz7UR9oWM80F7TGSaVvZyt/3LBjhNXRsZnm9jsd6Mj0NuSjQrzwOwfGu/X1XgH 7/9QzR2W5yp3Yxxw2rslQ2dwBuiYEGQ= ARC-Authentication-Results: i=1; imf25.hostedemail.com; dkim=pass header.d=linutronix.de header.s=2020 header.b=yKoRbjsw; dkim=pass header.d=linutronix.de header.s=2020e header.b=i837O3Jj; dmarc=pass (policy=none) header.from=linutronix.de; spf=pass (imf25.hostedemail.com: domain of tglx@linutronix.de designates 193.142.43.55 as permitted sender) smtp.mailfrom=tglx@linutronix.de ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1700586820; a=rsa-sha256; cv=none; b=P1T0sLC/8kK4JlvNfDp24vpt+xmVcQSPNwNYgAB3DHi1x/eUMh/9IFD1x1R0WCYRNP3/bf 0WUJB6SU2qT27WrGHYIV1vlRxPBGoOGIeId0x3ghcc2eXTzeaZrOzyhXtObDkcvRf/fyfT oMMH0XXFcB5jfpzr+Vgk2audfULFgTQ= From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1700586817; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=I1cohRsqh/gMhQXdMjmF/EuQWloEkKiFSISrxy+k+Yc=; b=yKoRbjsw+M17klBqF2oTGsSjab+urRzwkmf3bgaPsgI9SRyvP3MOQsRW73SchXHd+8bDQ7 dekfagNyy3HkIjpcObwWt9cVMGdAXaik7+XrPsUQG/BdvtVOS3tJQQgtiYK9MsZoinXYUe nNiqkC85nrXyE/1Au4nKbrd2GX0IR0XfqT9s7fNhxhdHGqwuPIwURGGD+0RtT/BuqthHDf JRpq3q5QppnAtDvmHLB3YMVKrS8viAl2nsOye3jv766JCtcy3exvkN/5h3tWgJsFVdXG/I PsNLGmndD/Grb30YnMwUJ/2kbH7r1oUfbDwdWLbanRpFPp5Acwrc5eMmYOPeqA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1700586817; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=I1cohRsqh/gMhQXdMjmF/EuQWloEkKiFSISrxy+k+Yc=; b=i837O3Jj13QAzuwzURXhtUBgENdXHytu9f4mzpfzuKO8+CNfdSBX0StCX4uHyyZAcZCwlg KF+oUz4ZAoaLJJDA== To: syzbot , akpm@linux-foundation.org, bp@alien8.de, bp@suse.de, dave.hansen@linux.intel.com, hpa@zytor.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, luto@kernel.org, mingo@redhat.com, netdev@vger.kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com, x86@kernel.org Subject: Re: [syzbot] [mm?] BUG: unable to handle kernel paging request in copy_from_kernel_nofault In-Reply-To: <000000000000c84343060a850bd0@google.com> References: <000000000000c84343060a850bd0@google.com> Date: Tue, 21 Nov 2023 18:13:36 +0100 Message-ID: <87jzqb1133.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain X-Rspamd-Queue-Id: 31701A000A X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: u56bh68mk5dytnasj3f84o6ckti8q5dn X-HE-Tag: 1700586819-675652 X-HE-Meta: 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 gh04wY/1 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sun, Nov 19 2023 at 09:53, syzbot wrote: > HEAD commit: 1fda5bb66ad8 bpf: Do not allocate percpu memory at init st.. > git tree: bpf > console+strace: https://syzkaller.appspot.com/x/log.txt?x=12d99420e80000 > kernel config: https://syzkaller.appspot.com/x/.config?x=2ae0ccd6bfde5eb0 > dashboard link: https://syzkaller.appspot.com/bug?extid=72aa0161922eba61b50e > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16dff22f680000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1027dc70e80000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/3e24d257ce8d/disk-1fda5bb6.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/eaa9caffb0e4/vmlinux-1fda5bb6.xz > kernel image: https://storage.googleapis.com/syzbot-assets/16182bbed726/bzImage-1fda5bb6.xz > > The issue was bisected to: > > commit ca247283781d754216395a41c5e8be8ec79a5f1c > Author: Andy Lutomirski > Date: Wed Feb 10 02:33:45 2021 +0000 > > x86/fault: Don't run fixups for SMAP violations Reverting that makes the Ooops go away, but wrongly so. > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=103d92db680000 > final oops: https://syzkaller.appspot.com/x/report.txt?x=123d92db680000 > console output: https://syzkaller.appspot.com/x/log.txt?x=143d92db680000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+72aa0161922eba61b50e@syzkaller.appspotmail.com > Fixes: ca247283781d ("x86/fault: Don't run fixups for SMAP violations") > > BUG: unable to handle page fault for address: ffffffffff600000 This is VSYSCALL_ADDR. So the real question is why the BPF program tries to copy from the VSYSCALL page, which is not mapped. Thanks, tglx