From nobody Mon Aug 29 18:22:23 2022 X-Original-To: riscv@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4MGf1C4fgqz4bdLx for ; Mon, 29 Aug 2022 18:22:23 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4MGf1C2px2z3X6f for ; Mon, 29 Aug 2022 18:22:23 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 4MGf1C1sq7zWZK for ; Mon, 29 Aug 2022 18:22:23 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 27TIMN4k063832 for ; Mon, 29 Aug 2022 18:22:23 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 27TIMNqf063831 for riscv@FreeBSD.org; Mon, 29 Aug 2022 18:22:23 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: riscv@FreeBSD.org Subject: [Bug 266103] ioctl(/dev/mem, MEM_EXTRACT_PADDR, <0x80000000>) on /dev/mem on riscv64 panics Date: Mon, 29 Aug 2022 18:22:23 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: riscv X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: rtm@lcs.mit.edu X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: riscv@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: FreeBSD on the RISC-V instruction set architecture List-Archive: https://lists.freebsd.org/archives/freebsd-riscv List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-riscv@freebsd.org X-BeenThere: freebsd-riscv@freebsd.org MIME-Version: 1.0 ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1661797343; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=Cytz//KhCsw3CJkxcFwrsXi9ecWQiuKzPH+r/nqiWzM=; b=FkMrX0Pp6JNtlM6ceyrm2YyvMoXcZuM3hL9jHRRknpMleASPflcpe+OfCNX51Gjud5iC9q JHpupsAzgH0UbtaX4AwS3A+pGYNWZeyT70rs1v3MEhmoxSi2L9S9eiTdgCBsJqsyuU0sn+ aSaiv1VPAqXkv/jleEa0LKKxQmkTtgFhvKzjsiaeWtmZ83AGzdA3ueWnCqjAjpP922gjkD 8oPfxMrtrWN5UWbiX9WuKbqtVuFj6KRjl3uX74zsACsUA2yltwb8mqHMViUnEs2cpgcfiZ e580vvHyTjKzaTXabVGGZYiZgvURPY3LJsUzunOmXLAIm/Gj/VegD/O9j1D+QQ== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1661797343; a=rsa-sha256; cv=none; b=KagR/FrlIBl3JHjCkb43DBoBzzjPnGxzdt2v5gARHnpnBzSKWiuGrfblInPA9N7/jJGwXz 5kTc+4Rn3LVwrIhqxE/OU0I7kIJls1tkAX6LxTER/JLX0pJym+IzL6GAUK7Iwma+RJZ60K YXM2dhgfZz17PuwbSY22s2k2VyxqvrmNk8tP6cRYbFmlOE+iL7/5wzyJCIkrZIv2QbGEq0 r8XD6XqDxQ0pUux3EBb3JX9LuAL/HjgA4/imQ7G54T+X7RSGDPKHevFnVB65VScW7gFluM ZTHcLlQu5wSDibxg+LImHZ9SD6Ss1xS32OzcdUW0/jOhg37WlbFBVn9FoRHcQA== ARC-Authentication-Results: i=1; mx1.freebsd.org; none X-ThisMailContainsUnwantedMimeParts: N https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D266103 Bug ID: 266103 Summary: ioctl(/dev/mem, MEM_EXTRACT_PADDR, <0x80000000>) on /dev/mem on riscv64 panics Product: Base System Version: CURRENT Hardware: riscv OS: Any Status: New Severity: Affects Some People Priority: --- Component: riscv Assignee: riscv@FreeBSD.org Reporter: rtm@lcs.mit.edu On qemu riscv64, the program below causes "panic: pmap_l2_to_l3: PA out of range, PA: 0x0" on an INVARIANTS kernel, and a kernel page fault without INVARIANTS. The immediate problem seems to be that the l2 PTE that pmap_extract() finds is all zeroes, but pmap_l2_to_l3() assumes it contains a valid physical address. #include #include #include #include #include int main() { int fd =3D open("/dev/mem", 2); struct mem_extract m; memset(&m, 0, sizeof(m)); m.me_vaddr =3D 0x80000000; ioctl(fd, MEM_EXTRACT_PADDR, &m); } # uname -a FreeBSD 14.0-CURRENT FreeBSD 14.0-CURRENT #40 main-n250928-b8170f38ccc7-di= rty: Mon Aug 29 13:09:55 EDT 2022=20=20=20=20 rtm@xxx:/usr/obj/usr/rtm/symbsd/src/riscv.riscv64/sys/RTM riscv # cc x.c # ./a.out panic: Fatal page fault at 0xffffffc000618a18: 0xffffffcf80000000 panic() at panic+0x2a page_fault_handler() at page_fault_handler+0x1d6 do_trap_supervisor() at do_trap_supervisor+0x76 cpu_exception_handler_supervisor() at cpu_exception_handler_supervisor+0x70 --- exception 13, tval =3D 0xffffffcf80000000 pmap_extract() at pmap_extract+0x64 memioctl() at memioctl+0x78 devfs_ioctl() at devfs_ioctl+0xbe VOP_IOCTL_APV() at VOP_IOCTL_APV+0x30 VOP_IOCTL() at VOP_IOCTL+0x36 vn_ioctl() at vn_ioctl+0xba devfs_ioctl_f() at devfs_ioctl_f+0x20 fo_ioctl() at fo_ioctl+0xa kern_ioctl() at kern_ioctl+0x242 sys_ioctl() at sys_ioctl+0x120 syscallenter() at syscallenter+0xec ecall_handler() at ecall_handler+0x18 do_trap_user() at do_trap_user+0xea cpu_exception_handler_user() at cpu_exception_handler_user+0x72 --=20 You are receiving this mail because: You are the assignee for the bug.=