agp: fix arbitrary kernel memory writes

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pg_start is copied from userspace on AGPIOC_BIND and AGPIOC_UNBIND ioctl
cmds of agp_ioctl() and passed to agpioc_bind_wrap().  As said in the
comment, (pg_start + mem->page_count) may wrap in case of AGPIOC_BIND,
and it is not checked at all in case of AGPIOC_UNBIND.  As a result, user
with sufficient privileges (usually "video" group) may generate either
local DoS or privilege escalation.

Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

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Vasiliy Kulikov 2011-04-14 20:55:16 +04:00 • committed by Dave Airlie

parent b522f02184

commit 194b3da873

1 changed files with 8 additions and 3 deletions

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11

drivers/char/agp/generic.c

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