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linux/drivers/ptp
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Gustavo A. R. Silva e9dbac3438 ptp: fix Spectre v1 vulnerability 
commit efa61c8cf2 upstream.

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

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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
History 2018-12-16 22:09:42 +00:00
..
Kconfig ptp: ptp_pch depends on x86_32 2014-06-17 15:43:48 -07:00
Makefile supports eg20t ptp clock 2012-03-09 13:55:34 -08:00
ptp_chardev.c ptp: fix Spectre v1 vulnerability 2018-12-16 22:09:42 +00:00
ptp_clock.c ptp: validate the requested frequency adjustment. 2014-04-28 13:28:43 -04:00
ptp_ixp46x.c ptp: drivers: set the number of programmable pins. 2014-03-21 14:21:14 -04:00
ptp_pch.c ptp: drivers: set the number of programmable pins. 2014-03-21 14:21:14 -04:00
ptp_private.h ptp: expose the programmable pins via sysfs 2014-03-21 14:21:14 -04:00
ptp_sysfs.c ptp: expose the programmable pins via sysfs 2014-03-21 14:21:14 -04:00