Gil Kupfer 5ee296fde5 vmw_balloon: fixing double free when batching mode is off ... commit b23220fe05 upstream. The balloon.page field is used for two different purposes if batching is on or off. If batching is on, the field point to the page which is used to communicate with with the hypervisor. If it is off, balloon.page points to the page that is about to be (un)locked. Unfortunately, this dual-purpose of the field introduced a bug: when the balloon is popped (e.g., when the machine is reset or the balloon driver is explicitly removed), the balloon driver frees, unconditionally, the page that is held in balloon.page. As a result, if batching is disabled, this leads to double freeing the last page that is sent to the hypervisor. The following error occurs during rmmod when kernel checkers are on, and the balloon is not empty: [ 42.307653] ------------[ cut here ]------------ [ 42.307657] Kernel BUG at ffffffffba1e4b28 [verbose debug info unavailable] [ 42.307720] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC [ 42.312512] Modules linked in: vmw_vsock_vmci_transport vsock ppdev joydev vmw_balloon(-) input_leds serio_raw vmw_vmci parport_pc shpchp parport i2c_piix4 nfit mac_hid autofs4 vmwgfx drm_kms_helper hid_generic syscopyarea sysfillrect usbhid sysimgblt fb_sys_fops hid ttm mptspi scsi_transport_spi ahci mptscsih drm psmouse vmxnet3 libahci mptbase pata_acpi [ 42.312766] CPU: 10 PID: 1527 Comm: rmmod Not tainted 4.12.0+ #5 [ 42.312803] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 09/30/2016 [ 42.313042] task: ffff9bf9680f8000 task.stack: ffffbfefc1638000 [ 42.313290] RIP: 0010:__free_pages+0x38/0x40 [ 42.313510] RSP: 0018:ffffbfefc163be98 EFLAGS: 00010246 [ 42.313731] RAX: 000000000000003e RBX: ffffffffc02b9720 RCX: 0000000000000006 [ 42.313972] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff9bf97e08e0a0 [ 42.314201] RBP: ffffbfefc163be98 R08: 0000000000000000 R09: 0000000000000000 [ 42.314435] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffc02b97e4 [ 42.314505] R13: ffffffffc02b9748 R14: ffffffffc02b9728 R15: 0000000000000200 [ 42.314550] FS: 00007f3af5fec700(0000) GS:ffff9bf97e080000(0000) knlGS:0000000000000000 [ 42.314599] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.314635] CR2: 00007f44f6f4ab24 CR3: 00000003a7d12000 CR4: 00000000000006e0 [ 42.314864] Call Trace: [ 42.315774] vmballoon_pop+0x102/0x130 [vmw_balloon] [ 42.315816] vmballoon_exit+0x42/0xd64 [vmw_balloon] [ 42.315853] SyS_delete_module+0x1e2/0x250 [ 42.315891] entry_SYSCALL_64_fastpath+0x23/0xc2 [ 42.315924] RIP: 0033:0x7f3af5b0e8e7 [ 42.315949] RSP: 002b:00007fffe6ce0148 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 [ 42.315996] RAX: ffffffffffffffda RBX: 000055be676401e0 RCX: 00007f3af5b0e8e7 [ 42.316951] RDX: 000000000000000a RSI: 0000000000000800 RDI: 000055be67640248 [ 42.317887] RBP: 0000000000000003 R08: 0000000000000000 R09: 1999999999999999 [ 42.318845] R10: 0000000000000883 R11: 0000000000000206 R12: 00007fffe6cdf130 [ 42.319755] R13: 0000000000000000 R14: 0000000000000000 R15: 000055be676401e0 [ 42.320606] Code: c0 74 1c f0 ff 4f 1c 74 02 5d c3 85 f6 74 07 e8 0f d8 ff ff 5d c3 31 f6 e8 c6 fb ff ff 5d c3 48 c7 c6 c8 0f c5 ba e8 58 be 02 00 <0f> 0b 66 0f 1f 44 00 00 66 66 66 66 90 48 85 ff 75 01 c3 55 48 [ 42.323462] RIP: __free_pages+0x38/0x40 RSP: ffffbfefc163be98 [ 42.325735] ---[ end trace 872e008e33f81508 ]--- To solve the bug, we eliminate the dual purpose of balloon.page. Fixes: f220a80f0c ("VMware balloon: add batching to the vmw_balloon.") Cc: stable@vger.kernel.org Reported-by: Oleksandr Natalenko <onatalen@redhat.com> Signed-off-by: Gil Kupfer <gilkup@gmail.com> Signed-off-by: Nadav Amit <namit@vmware.com> Reviewed-by: Xavier Deguillard <xdeguillard@vmware.com> Tested-by: Oleksandr Natalenko <oleksandr@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-06-16 09:45:16 +02:00
..
altera-stapl
c2port	kmemcheck: remove annotations	2018-02-22 15:42:23 +01:00
cb710
cxl	cxl: Check if PSL data-cache is available before issue flush request	2018-05-30 07:52:33 +02:00
echo
eeprom	eeprom: at24: change nvmem stride to 1	2017-12-20 10:10:21 +01:00
genwqe
ibmasm	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
lis3lv02d	misc: lis3lv02d: constify attribute_group structures.	2017-08-28 16:55:48 +02:00
mei	mei: remove dev_err message on an unsupported ioctl	2018-04-08 14:26:31 +02:00
mic	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
sgi-gru	sgi-gru: update to new mmu_notifier semantic	2017-08-31 16:13:00 -07:00
sgi-xp	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
ti-st	misc: ti-st: constify attribute_group structures.	2017-08-28 16:55:48 +02:00
vmw_vmci	vmci: fix duplicated code for different branches	2017-08-28 16:55:50 +02:00
ad525x_dpot-i2c.c
ad525x_dpot-spi.c
ad525x_dpot.c
ad525x_dpot.h
apds990x.c	misc: apds990x: constify attribute_group structures.	2017-08-28 16:55:49 +02:00
apds9802als.c	misc: apds9802als: constify i2c_device_id	2017-08-28 16:55:49 +02:00
aspeed-lpc-ctrl.c
aspeed-lpc-snoop.c	drivers/misc: (aspeed-lpc-snoop): Add ast2400 to compat	2017-07-17 17:23:16 +02:00
atmel-ssc.c
atmel_tclib.c
bh1770glc.c	misc: bh1770glc: constify attribute_group structures.	2017-08-28 16:55:48 +02:00
cs5535-mfgpt.c
ds1682.c	MISC: add const to bin_attribute structures	2017-08-28 16:55:48 +02:00
dummy-irq.c
enclosure.c
fsa9480.c
hmc6352.c	misc: hmc6352: constify i2c_device_id	2017-08-28 16:55:49 +02:00
hpilo.c	misc: hpilo: constify pci_device_id.	2017-08-28 16:55:48 +02:00
hpilo.h
ics932s401.c
ioc4.c	misc: ioc4: constify pci_device_id.	2017-08-28 16:55:48 +02:00
isl29003.c
isl29020.c	misc: isl29020: constify i2c_device_id	2017-08-28 16:55:49 +02:00
Kconfig
kgdbts.c
lattice-ecp3-config.c
lkdtm.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
lkdtm_bugs.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
lkdtm_core.c	lkdtm: Add -fstack-protector-strong test	2017-08-15 12:27:35 -07:00
lkdtm_heap.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
lkdtm_perms.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
lkdtm_refcount.c	lkdtm: fix spelling mistake: "incremeted" -> "incremented"	2017-08-28 17:47:11 +02:00
lkdtm_rodata.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
lkdtm_usercopy.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
pch_phub.c	MISC: add const to bin_attribute structures	2017-08-28 16:55:48 +02:00
pci_endpoint_test.c	misc: pci_endpoint_test: Avoid triggering a BUG()	2017-12-20 10:10:28 +01:00
phantom.c
pti.c	drivers/misc/intel/pti: Rename the header file to free up the namespace	2017-12-25 14:26:20 +01:00
qcom-coincell.c
spear13xx_pcie_gadget.c
sram-exec.c
sram.c	misc: Convert to using %pOF instead of full_name	2017-08-28 16:55:49 +02:00
sram.h
ti_dac7512.c
tifm_7xx1.c	misc: tifm: constify pci_device_id.	2017-08-28 16:55:48 +02:00
tifm_core.c
tsl2550.c
vexpress-syscfg.c
vmw_balloon.c	vmw_balloon: fixing double free when batching mode is off	2018-06-16 09:45:16 +02:00