e5b0d06d9b
`struct vmci_event_qp` allocated by qp_notify_peer() contains padding,
which may carry uninitialized data to the userspace, as observed by
KMSAN:
BUG: KMSAN: kernel-infoleak in instrument_copy_to_user ./include/linux/instrumented.h:121
instrument_copy_to_user ./include/linux/instrumented.h:121
_copy_to_user+0x5f/0xb0 lib/usercopy.c:33
copy_to_user ./include/linux/uaccess.h:169
vmci_host_do_receive_datagram drivers/misc/vmw_vmci/vmci_host.c:431
vmci_host_unlocked_ioctl+0x33d/0x43d0 drivers/misc/vmw_vmci/vmci_host.c:925
vfs_ioctl fs/ioctl.c:51
...
Uninit was stored to memory at:
kmemdup+0x74/0xb0 mm/util.c:131
dg_dispatch_as_host drivers/misc/vmw_vmci/vmci_datagram.c:271
vmci_datagram_dispatch+0x4f8/0xfc0 drivers/misc/vmw_vmci/vmci_datagram.c:339
qp_notify_peer+0x19a/0x290 drivers/misc/vmw_vmci/vmci_queue_pair.c:1479
qp_broker_attach drivers/misc/vmw_vmci/vmci_queue_pair.c:1662
qp_broker_alloc+0x2977/0x2f30 drivers/misc/vmw_vmci/vmci_queue_pair.c:1750
vmci_qp_broker_alloc+0x96/0xd0 drivers/misc/vmw_vmci/vmci_queue_pair.c:1940
vmci_host_do_alloc_queuepair drivers/misc/vmw_vmci/vmci_host.c:488
vmci_host_unlocked_ioctl+0x24fd/0x43d0 drivers/misc/vmw_vmci/vmci_host.c:927
...
Local variable ev created at:
qp_notify_peer+0x54/0x290 drivers/misc/vmw_vmci/vmci_queue_pair.c:1456
qp_broker_attach drivers/misc/vmw_vmci/vmci_queue_pair.c:1662
qp_broker_alloc+0x2977/0x2f30 drivers/misc/vmw_vmci/vmci_queue_pair.c:1750
Bytes 28-31 of 48 are uninitialized
Memory access of size 48 starts at ffff888035155e00
Data copied to user address 0000000020000100
Use memset() to prevent the infoleaks.
Also speculatively fix qp_notify_peer_local(), which may suffer from the
same problem.
Reported-by: syzbot+39be4da489ed2493ba25@syzkaller.appspotmail.com
Cc: stable <stable@kernel.org>
Fixes:
|
||
|---|---|---|
| .. | ||
| altera-stapl | ||
| bcm-vk | ||
| c2port | ||
| cardreader | ||
| cb710 | ||
| cxl | ||
| echo | ||
| eeprom | ||
| genwqe | ||
| habanalabs | ||
| ibmasm | ||
| lis3lv02d | ||
| lkdtm | ||
| mchp_pci1xxxx | ||
| mei | ||
| ocxl | ||
| pvpanic | ||
| sgi-gru | ||
| sgi-xp | ||
| ti-st | ||
| uacce | ||
| vmw_vmci | ||
| Kconfig | ||
| Makefile | ||
| ad525x_dpot-i2c.c | ||
| ad525x_dpot-spi.c | ||
| ad525x_dpot.c | ||
| ad525x_dpot.h | ||
| apds990x.c | ||
| apds9802als.c | ||
| atmel-ssc.c | ||
| bh1770glc.c | ||
| cs5535-mfgpt.c | ||
| ds1682.c | ||
| dummy-irq.c | ||
| dw-xdata-pcie.c | ||
| enclosure.c | ||
| fastrpc.c | ||
| gehc-achc.c | ||
| hi6421v600-irq.c | ||
| hisi_hikey_usb.c | ||
| hmc6352.c | ||
| hpilo.c | ||
| hpilo.h | ||
| ibmvmc.c | ||
| ibmvmc.h | ||
| ics932s401.c | ||
| isl29003.c | ||
| isl29020.c | ||
| kgdbts.c | ||
| lattice-ecp3-config.c | ||
| open-dice.c | ||
| pch_phub.c | ||
| pci_endpoint_test.c | ||
| phantom.c | ||
| qcom-coincell.c | ||
| sram-exec.c | ||
| sram.c | ||
| sram.h | ||
| tifm_7xx1.c | ||
| tifm_core.c | ||
| tsl2550.c | ||
| vcpu_stall_detector.c | ||
| vmw_balloon.c | ||
| xilinx_sdfec.c | ||