kernel_optimize_test/drivers/ptp
Gustavo A. R. Silva efa61c8cf2 ptp: fix Spectre v1 vulnerability
pin_index can be indirectly controlled by user-space, hence leading
to a potential exploitation of the Spectre variant 1 vulnerability.

This issue was detected with the help of Smatch:

drivers/ptp/ptp_chardev.c:253 ptp_ioctl() warn: potential spectre issue
'ops->pin_config' [r] (local cap)

Fix this by sanitizing pin_index before using it to index
ops->pin_config, and before passing it as an argument to
function ptp_set_pinfunc(), in which it is used to index
info->pin_config.

Notice that given that speculation windows are large, the policy is
to kill the speculation on the first load and not worry if it can be
completed with a dependent load/store [1].

[1] https://marc.info/?l=linux-kernel&m=152449131114778&w=2

Cc: stable@vger.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-10-17 22:00:22 -07:00
..
Kconfig ptp: support DPAA FMan 1588 timer in ptp_qoriq 2018-06-26 22:15:14 +09:00
Makefile ptp: rework gianfar_ptp as QorIQ common PTP driver 2018-05-28 23:05:11 -04:00
ptp_chardev.c ptp: fix Spectre v1 vulnerability 2018-10-17 22:00:22 -07:00
ptp_clock.c ptp: introduce ptp auxiliary worker 2017-08-01 15:22:55 -07:00
ptp_dte.c headers: separate linux/mod_devicetable.h from linux/platform_device.h 2018-07-07 17:52:26 +02:00
ptp_ixp46x.c ptp: make ptp_clock_info const 2017-08-22 11:04:51 -07:00
ptp_kvm.c x86/pvclock: add setter for pvclock_pvti_cpu0_va 2017-11-08 16:33:14 -05:00
ptp_pch.c ptp_pch: use helpers function for converting between ns and timespec 2018-04-27 15:22:28 -04:00
ptp_private.h the rest of drivers/*: annotate ->poll() instances 2017-11-28 11:06:58 -05:00
ptp_qoriq.c ptp_qoriq: use div_u64/div_u64_rem for 64-bit division 2018-08-06 10:43:35 -07:00
ptp_sysfs.c ptp: create "pins" together with the rest of attributes 2017-02-17 11:03:06 -05:00