aio: fix spectre gadget in lookup_ioctx

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commit a538e3ff9d upstream.

Matthew pointed out that the ioctx_table is susceptible to spectre v1,
because the index can be controlled by an attacker.  The below patch
should mitigate the attack for all of the aio system calls.

Reported-by: Matthew Wilcox <willy@infradead.org>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Jeff Moyer 2018-12-11 12:37:49 -05:00 • committed by Ben Hutchings

parent dc1f560d5f

commit ce20cd87c5

1 changed files with 2 additions and 0 deletions

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fs/aio.c

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