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authorGustavo A. R. Silva <gustavo@embeddedor.com>2018-07-17 19:39:00 +0200
committerAlex Williamson <alex.williamson@redhat.com>2018-07-18 20:57:25 +0200
commit0e714d27786ce1fb3efa9aac58abc096e68b1c2a (patch)
tree0d46cee8004e651a4cab9262d43373f630c23026 /sound/isa/opti9xx
parentLinux 4.18-rc5 (diff)
downloadlinux-0e714d27786ce1fb3efa9aac58abc096e68b1c2a.tar.xz
linux-0e714d27786ce1fb3efa9aac58abc096e68b1c2a.zip
vfio/pci: Fix potential Spectre v1
info.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/vfio/pci/vfio_pci.c:734 vfio_pci_ioctl() warn: potential spectre issue 'vdev->region' Fix this by sanitizing info.index before indirectly using it to index vdev->region 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> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'sound/isa/opti9xx')
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