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authorGustavo A. R. Silva <gustavo@embeddedor.com>2018-10-16 12:16:45 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-10-17 20:57:55 +0200
commit9ae24af3669111d418242caec8dd4ebd9ba26860 (patch)
tree8101ff2b63f87ade850be0cd1424b5b493ccf69d /tools
parent665c365a77fbfeabe52694aedf3446d5f2f1ce42 (diff)
usb: gadget: storage: Fix Spectre v1 vulnerability
num 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/usb/gadget/function/f_mass_storage.c:3177 fsg_lun_make() warn: potential spectre issue 'fsg_opts->common->luns' [r] (local cap) Fix this by sanitizing num before using it to index fsg_opts->common->luns 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: Felipe Balbi <felipe.balbi@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools')
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