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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org,
	Sean Christopherson <sean.j.christopherson@intel.com>,
	Paolo Bonzini <pbonzini@redhat.com>
Subject: [PATCH 4.4 40/88] KVM: x86: Use jmp to invoke kvm_spurious_fault() from .fixup
Date: Fri, 11 Jan 2019 15:08:09 +0100
Message-ID: <20190111131051.814377244@linuxfoundation.org> (raw)
In-Reply-To: <20190111131045.137499039@linuxfoundation.org>

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sean Christopherson <sean.j.christopherson@intel.com>

commit e81434995081fd7efb755fd75576b35dbb0850b1 upstream.

____kvm_handle_fault_on_reboot() provides a generic exception fixup
handler that is used to cleanly handle faults on VMX/SVM instructions
during reboot (or at least try to).  If there isn't a reboot in
progress, ____kvm_handle_fault_on_reboot() treats any exception as
fatal to KVM and invokes kvm_spurious_fault(), which in turn generates
a BUG() to get a stack trace and die.

When it was originally added by commit 4ecac3fd6dc2 ("KVM: Handle
virtualization instruction #UD faults during reboot"), the "call" to
kvm_spurious_fault() was handcoded as PUSH+JMP, where the PUSH'd value
is the RIP of the faulting instructing.

The PUSH+JMP trickery is necessary because the exception fixup handler
code lies outside of its associated function, e.g. right after the
function.  An actual CALL from the .fixup code would show a slightly
bogus stack trace, e.g. an extra "random" function would be inserted
into the trace, as the return RIP on the stack would point to no known
function (and the unwinder will likely try to guess who owns the RIP).

Unfortunately, the JMP was replaced with a CALL when the macro was
reworked to not spin indefinitely during reboot (commit b7c4145ba2eb
"KVM: Don't spin on virt instruction faults during reboot").  This
causes the aforementioned behavior where a bogus function is inserted
into the stack trace, e.g. my builds like to blame free_kvm_area().

Revert the CALL back to a JMP.  The changelog for commit b7c4145ba2eb
("KVM: Don't spin on virt instruction faults during reboot") contains
nothing that indicates the switch to CALL was deliberate.  This is
backed up by the fact that the PUSH <insn RIP> was left intact.

Note that an alternative to the PUSH+JMP magic would be to JMP back
to the "real" code and CALL from there, but that would require adding
a JMP in the non-faulting path to avoid calling kvm_spurious_fault()
and would add no value, i.e. the stack trace would be the same.

Using CALL:

------------[ cut here ]------------
kernel BUG at /home/sean/go/src/kernel.org/linux/arch/x86/kvm/x86.c:356!
invalid opcode: 0000 [#1] SMP
CPU: 4 PID: 1057 Comm: qemu-system-x86 Not tainted 4.20.0-rc6+ #75
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
RIP: 0010:kvm_spurious_fault+0x5/0x10 [kvm]
Code: <0f> 0b 66 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 55 49 89 fd 41
RSP: 0018:ffffc900004bbcc8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffffffffffff
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888273fd8000 R08: 00000000000003e8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000784 R12: ffffc90000371fb0
R13: 0000000000000000 R14: 000000026d763cf4 R15: ffff888273fd8000
FS:  00007f3d69691700(0000) GS:ffff888277800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f89bc56fe0 CR3: 0000000271a5a001 CR4: 0000000000362ee0
Call Trace:
 free_kvm_area+0x1044/0x43ea [kvm_intel]
 ? vmx_vcpu_run+0x156/0x630 [kvm_intel]
 ? kvm_arch_vcpu_ioctl_run+0x447/0x1a40 [kvm]
 ? kvm_vcpu_ioctl+0x368/0x5c0 [kvm]
 ? kvm_vcpu_ioctl+0x368/0x5c0 [kvm]
 ? __set_task_blocked+0x38/0x90
 ? __set_current_blocked+0x50/0x60
 ? __fpu__restore_sig+0x97/0x490
 ? do_vfs_ioctl+0xa1/0x620
 ? __x64_sys_futex+0x89/0x180
 ? ksys_ioctl+0x66/0x70
 ? __x64_sys_ioctl+0x16/0x20
 ? do_syscall_64+0x4f/0x100
 ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
Modules linked in: vhost_net vhost tap kvm_intel kvm irqbypass bridge stp llc
---[ end trace 9775b14b123b1713 ]---

Using JMP:

------------[ cut here ]------------
kernel BUG at /home/sean/go/src/kernel.org/linux/arch/x86/kvm/x86.c:356!
invalid opcode: 0000 [#1] SMP
CPU: 6 PID: 1067 Comm: qemu-system-x86 Not tainted 4.20.0-rc6+ #75
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
RIP: 0010:kvm_spurious_fault+0x5/0x10 [kvm]
Code: <0f> 0b 66 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 55 49 89 fd 41
RSP: 0018:ffffc90000497cd0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffffffffffff
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88827058bd40 R08: 00000000000003e8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000784 R12: ffffc90000369fb0
R13: 0000000000000000 R14: 00000003c8fc6642 R15: ffff88827058bd40
FS:  00007f3d7219e700(0000) GS:ffff888277900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3d64001000 CR3: 0000000271c6b004 CR4: 0000000000362ee0
Call Trace:
 vmx_vcpu_run+0x156/0x630 [kvm_intel]
 ? kvm_arch_vcpu_ioctl_run+0x447/0x1a40 [kvm]
 ? kvm_vcpu_ioctl+0x368/0x5c0 [kvm]
 ? kvm_vcpu_ioctl+0x368/0x5c0 [kvm]
 ? __set_task_blocked+0x38/0x90
 ? __set_current_blocked+0x50/0x60
 ? __fpu__restore_sig+0x97/0x490
 ? do_vfs_ioctl+0xa1/0x620
 ? __x64_sys_futex+0x89/0x180
 ? ksys_ioctl+0x66/0x70
 ? __x64_sys_ioctl+0x16/0x20
 ? do_syscall_64+0x4f/0x100
 ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
Modules linked in: vhost_net vhost tap kvm_intel kvm irqbypass bridge stp llc
---[ end trace f9daedb85ab3ddba ]---

Fixes: b7c4145ba2eb ("KVM: Don't spin on virt instruction faults during reboot")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/x86/include/asm/kvm_host.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1200,7 +1200,7 @@ asmlinkage void kvm_spurious_fault(void)
 	"cmpb $0, kvm_rebooting \n\t"	      \
 	"jne 668b \n\t"      		      \
 	__ASM_SIZE(push) " $666b \n\t"	      \
-	"call kvm_spurious_fault \n\t"	      \
+	"jmp kvm_spurious_fault \n\t"	      \
 	".popsection \n\t" \
 	_ASM_EXTABLE(666b, 667b)
 



  parent reply index

Thread overview: 102+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-11 14:07 [PATCH 4.4 00/88] 4.4.170-stable review Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 01/88] USB: hso: Fix OOB memory access in hso_probe/hso_get_config_data Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 02/88] xhci: Dont prevent USB2 bus suspend in state check intended for USB3 only Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 03/88] USB: serial: option: add GosunCn ZTE WeLink ME3630 Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 04/88] USB: serial: option: add HP lt4132 Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 05/88] USB: serial: option: add Simcom SIM7500/SIM7600 (MBIM mode) Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 06/88] USB: serial: option: add Fibocom NL668 series Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 07/88] USB: serial: option: add Telit LN940 series Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 08/88] mmc: core: Reset HPI enabled state during re-init and in case of errors Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 09/88] mmc: omap_hsmmc: fix DMA API warning Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 10/88] gpio: max7301: fix driver for use with CONFIG_VMAP_STACK Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 11/88] Drivers: hv: vmbus: Return -EINVAL for the sys files for unopened channels Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 12/88] x86/mtrr: Dont copy uninitialized gentry fields back to userspace Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 13/88] drm/ioctl: Fix Spectre v1 vulnerabilities Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 14/88] ip6mr: Fix potential Spectre v1 vulnerability Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 15/88] ipv4: " Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 16/88] ax25: fix a use-after-free in ax25_fillin_cb() Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 17/88] ibmveth: fix DMA unmap error in ibmveth_xmit_start error path Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 18/88] ieee802154: lowpan_header_create check must check daddr Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 19/88] ipv6: explicitly initialize udp6_addr in udp_sock_create6() Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 20/88] isdn: fix kernel-infoleak in capi_unlocked_ioctl Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 21/88] netrom: fix locking in nr_find_socket() Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 22/88] packet: validate address length Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 23/88] packet: validate address length if non-zero Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 24/88] sctp: initialize sin6_flowinfo for ipv6 addrs in sctp_inet6addr_event Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 25/88] vhost: make sure used idx is seen before log in vhost_add_used_n() Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 26/88] VSOCK: Send reset control packet when socket is partially bound Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 27/88] xen/netfront: tolerate frags with no data Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 28/88] gro_cell: add napi_disable in gro_cells_destroy Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 29/88] sock: Make sock->sk_stamp thread-safe Greg Kroah-Hartman
2019-01-11 14:07 ` [PATCH 4.4 30/88] ALSA: rme9652: Fix potential Spectre v1 vulnerability Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 31/88] ALSA: emu10k1: Fix potential Spectre v1 vulnerabilities Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 32/88] ALSA: pcm: Fix potential Spectre v1 vulnerability Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 33/88] ALSA: emux: Fix potential Spectre v1 vulnerabilities Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 34/88] ALSA: hda: add mute LED support for HP EliteBook 840 G4 Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 35/88] ALSA: hda/tegra: clear pending irq handlers Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 36/88] USB: serial: pl2303: add ids for Hewlett-Packard HP POS pole displays Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 37/88] USB: serial: option: add Fibocom NL678 series Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 38/88] usb: r8a66597: Fix a possible concurrency use-after-free bug in r8a66597_endpoint_disable() Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 39/88] Input: elan_i2c - add ACPI ID for touchpad in ASUS Aspire F5-573G Greg Kroah-Hartman
2019-01-11 14:08 ` Greg Kroah-Hartman [this message]
2019-01-11 14:08 ` [PATCH 4.4 41/88] perf pmu: Suppress potential format-truncation warning Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 42/88] ext4: fix possible use after free in ext4_quota_enable Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 43/88] ext4: missing unlock/put_page() in ext4_try_to_write_inline_data() Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 44/88] ext4: fix EXT4_IOC_GROUP_ADD ioctl Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 45/88] ext4: force inode writes when nfsd calls commit_metadata() Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 46/88] spi: bcm2835: Fix race on DMA termination Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 47/88] spi: bcm2835: Fix book-keeping of " Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 48/88] spi: bcm2835: Avoid finishing transfer prematurely in IRQ mode Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 49/88] cdc-acm: fix abnormal DATA RX issue for Mediatek Preloader Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 50/88] media: vivid: free bitmap_cap when updating std/timings/etc Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 51/88] MIPS: Ensure pmd_present() returns false after pmd_mknotpresent() Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 52/88] MIPS: Align kernel load address to 64KB Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 53/88] CIFS: Fix error mapping for SMB2_LOCK command which caused OFD lock problem Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 54/88] x86/kvm/vmx: do not use vm-exit instruction length for fast MMIO when running nested Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 55/88] spi: bcm2835: Unbreak the build of esoteric configs Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 56/88] powerpc: Fix COFF zImage booting on old powermacs Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 57/88] ARM: imx: update the cpu power up timing setting on i.mx6sx Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 58/88] Input: restore EV_ABS ABS_RESERVED Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 59/88] checkstack.pl: fix for aarch64 Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 60/88] xfrm: Fix bucket count reported to userspace Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 61/88] scsi: bnx2fc: Fix NULL dereference in error handling Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 62/88] Input: omap-keypad - fix idle configuration to not block SoC idle states Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 63/88] scsi: zfcp: fix posting too many status read buffers leading to adapter shutdown Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 64/88] fork: record start_time late Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 65/88] hwpoison, memory_hotplug: allow hwpoisoned pages to be offlined Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 66/88] mm, devm_memremap_pages: mark devm_memremap_pages() EXPORT_SYMBOL_GPL Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 67/88] mm, devm_memremap_pages: kill mapping "System RAM" support Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 68/88] sunrpc: fix cache_head leak due to queued request Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 69/88] sunrpc: use SVC_NET() in svcauth_gss_* functions Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 70/88] crypto: x86/chacha20 - avoid sleeping with preemption disabled Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 71/88] block: break discard submissions into the user defined size Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 72/88] block: dont deal with discard limit in blkdev_issue_discard() Greg Kroah-Hartman
2019-01-11 14:25   ` Mike Snitzer
2019-01-11 14:34     ` Mike Snitzer
2019-01-11 14:35     ` Greg Kroah-Hartman
2019-01-11 15:06       ` Mike Snitzer
2019-01-11 15:17         ` Greg Kroah-Hartman
2019-01-11 15:23           ` Mike Snitzer
2019-01-11 15:44             ` Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 73/88] ALSA: cs46xx: Potential NULL dereference in probe Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 74/88] ALSA: usb-audio: Avoid access before bLength check in build_audio_procunit() Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 75/88] ALSA: usb-audio: Fix an out-of-bound read in create_composite_quirks Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 76/88] dlm: fixed memory leaks after failed ls_remove_names allocation Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 77/88] dlm: possible memory leak on error path in create_lkb() Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 78/88] dlm: lost put_lkb on error path in receive_convert() and receive_unlock() Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 79/88] dlm: memory leaks on error path in dlm_user_request() Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 80/88] gfs2: Fix loop in gfs2_rbm_find Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 81/88] b43: Fix error in cordic routine Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 82/88] 9p/net: put a lower bound on msize Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 83/88] iommu/vt-d: Handle domain agaw being less than iommu agaw Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 84/88] ceph: dont update importing caps mseq when handing cap export Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 85/88] genwqe: Fix size check Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 86/88] intel_th: msu: Fix an off-by-one in attribute store Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 87/88] power: supply: olpc_battery: correct the temperature units Greg Kroah-Hartman
2019-01-11 14:08 ` [PATCH 4.4 88/88] vhost/vsock: fix uninitialized vhost_vsock->guest_cid Greg Kroah-Hartman
2019-01-11 14:33   ` Greg Kroah-Hartman
2019-01-11 21:46 ` [PATCH 4.4 00/88] 4.4.170-stable review shuah
2019-01-12  8:06 ` Naresh Kamboju
2019-01-12 14:57 ` Harsh Shandilya
2019-01-12 15:46   ` Greg Kroah-Hartman
2019-01-12 17:42 ` Guenter Roeck

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