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imf04.hostedemail.com; dkim=none ("invalid DKIM record") header.d=intel.com header.s=Intel header.b=hJoPaoqw; dmarc=pass (policy=none) header.from=intel.com; arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}"); spf=pass (imf04.hostedemail.com: domain of ira.weiny@intel.com designates 192.55.52.115 as permitted sender) smtp.mailfrom=ira.weiny@intel.com ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1660263112; a=rsa-sha256; cv=fail; b=IZNCfT+xdHBLdC2u5vtYjDxbJF3QR9BUqlcjMa7Gz/4qaEZf59WypJajBqRPEDvk+rtdn5 HTo+qbHnNNrwRSDcZ5fMKefoC+9jgN+ctsI2EXE5a2LRh8/e3Z94yGUcFoR/xTpurzPyNd K9OU6OuDpnv8tk89+L7YvwTH4fyayTo= ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1660263112; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=MBhHUTH+9GNdied5TFUcxqx3/6ELyQz6yXp/rza8D8k=; b=FJV/ruwX7WzSWoQ+TIAG3+KDV0U3PdM2nJ/mml3xqigBYCm6K/fqDjr/5Ha3aJS9skxUQ8 kMztwNdNNIiX9I521vPHx9NkR8pVVlEjd7z0pF18mD+sApCh0LMIF9SGY2bE/cV4l6DK2h XdQq7wRmb5UBrjztUtDe7tYKJXvkD2w= X-Rspam-User: Authentication-Results: imf04.hostedemail.com; dkim=none ("invalid DKIM record") header.d=intel.com header.s=Intel header.b=hJoPaoqw; dmarc=pass (policy=none) header.from=intel.com; arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}"); spf=pass (imf04.hostedemail.com: domain of ira.weiny@intel.com designates 192.55.52.115 as permitted sender) smtp.mailfrom=ira.weiny@intel.com X-Stat-Signature: zua6gipxhpoxebpkmdcxpqw6en9b7wem X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 9D93C40030 X-HE-Tag: 1660263111-443660 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: On Thu, Aug 11, 2022 at 02:00:59PM -0700, Kees Cook wrote: > On Thu, Aug 11, 2022 at 11:51:34AM -0700, Ira Weiny wrote: > > On Thu, Aug 11, 2022 at 10:39:29AM -0700, Ira wrote: > > > On Thu, Aug 11, 2022 at 08:33:16AM -0700, Kees Cook wrote: > > > > Hi Fabio, > > > > > > > > It seems likely that the kmap change[1] might be causing this crash. Is > > > > there a boot-time setup race between kmap being available and early umh > > > > usage? > > > > > > I don't see how this is a setup problem with the config reported here. > > > > > > CONFIG_64BIT=y > > > > > > ...and HIGHMEM is not set. > > > ...and PREEMPT_RT is not set. > > > > > > So the kmap_local_page() call in that stack should be a page_address() only. > > > > > > I think the issue must be some sort of race which was being prevented because > > > of the preemption and/or pagefault disable built into kmap_atomic(). > > > > > > Is this reproducable? > > > > > > The hunk below will surely fix it but I think the pagefault_disable() is > > > the only thing that is required. It would be nice to test it. > > > > Fabio and I discussed this. And he also mentioned that pagefault_disable() is > > all that is required. > > Okay, sounds good. > > > Do we have a way to test this? > > It doesn't look like syzbot has a reproducer yet, so its patch testing > system[1] will not work. But if you can send me a patch, I could land it > in -next and we could see if the reproduction frequency drops to zero. > (Looking at the dashboard, it's seen 2 crashes, most recently 8 hours > ago.) Patch sent. https://lore.kernel.org/lkml/20220812000919.408614-1-ira.weiny@intel.com/ But I'm more confused after looking at this again. Ira > > -Kees > > [1] https://github.com/google/syzkaller/blob/master/docs/syzbot.md#testing-patches > > > > > > syzbot found the following issue on: > > > > > > > > > > HEAD commit: bc6c6584ffb2 Add linux-next specific files for 20220810 > > > > > git tree: linux-next > > > > > console output: https://syzkaller.appspot.com/x/log.txt?x=115034c3080000 > > > > > kernel config: https://syzkaller.appspot.com/x/.config?x=5784be4315a4403b > > > > > dashboard link: https://syzkaller.appspot.com/bug?extid=3250d9c8925ef29e975f > > > > > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > > > > > > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > > > > Reported-by: syzbot+3250d9c8925ef29e975f@syzkaller.appspotmail.com > > > > > > > > > > BUG: unable to handle page fault for address: ffffdc0000000000 > > > > > #PF: supervisor read access in kernel mode > > > > > #PF: error_code(0x0000) - not-present page > > > > > PGD 11826067 P4D 11826067 PUD 0 > > > > > Oops: 0000 [#1] PREEMPT SMP KASAN > > > > > CPU: 0 PID: 1100 Comm: kworker/u4:5 Not tainted 5.19.0-next-20220810-syzkaller #0 > > > > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 > > > > > RIP: 0010:strnlen+0x3b/0x70 lib/string.c:504 > > > > > Code: 74 3c 48 bb 00 00 00 00 00 fc ff df 49 89 fc 48 89 f8 eb 09 48 83 c0 01 48 39 e8 74 1e 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 <0f> b6 14 1a 38 ca 7f 04 84 d2 75 11 80 38 00 75 d9 4c 29 e0 48 83 > > > > > RSP: 0000:ffffc90005c5fe10 EFLAGS: 00010246 > > > > > RAX: ffff000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 > > > > > RDX: 1fffe00000000000 RSI: 0000000000020000 RDI: ffff000000000000 > > > > > RBP: ffff000000020000 R08: 0000000000000005 R09: 0000000000000000 > > > > > R10: 0000000000000006 R11: 0000000000000000 R12: ffff000000000000 > > > > > R13: ffff88814764cc00 R14: ffff000000000000 R15: ffff88814764cc00 > > > > > FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 > > > > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > > > > CR2: ffffdc0000000000 CR3: 000000000bc8e000 CR4: 00000000003506f0 > > > > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > > > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > > > Call Trace: > > > > > > > > > > strnlen include/linux/fortify-string.h:119 [inline] > > > > > copy_string_kernel+0x26/0x250 fs/exec.c:616 > > > > > copy_strings_kernel+0xb3/0x190 fs/exec.c:655 > > > > > kernel_execve+0x377/0x500 fs/exec.c:1998 > > > > > call_usermodehelper_exec_async+0x2e3/0x580 kernel/umh.c:112 > > > > > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 > > > > > > > [...] > > > > > --- > > > > > This report is generated by a bot. It may contain errors. > > > > > See https://goo.gl/tpsmEJ for more information about syzbot. > > > > > syzbot engineers can be reached at syzkaller@googlegroups.com. > > > > > > > > > > syzbot will keep track of this issue. See: > > > > > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > -- > Kees Cook