On 4/14/20 9:35 AM, Magnus Karlsson wrote:
Add a check that the headroom cannot be larger than the available
space in the chunk. In the current code, a malicious user can set the
headroom to a value larger than the chunk size minus the fixed XDP
headroom. That way packets with a length larger than the supported
size in the umem could get accepted and result in an out-of-bounds
write.
Fixes: c0c77d8fb787 ("xsk: add user memory registration support sockopt")
Reported-by: Bui Quang Minh <minhquangbui99@xxxxxxxxx>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=207225
Signed-off-by: Magnus Karlsson <magnus.karlsson@xxxxxxxxx>
Applied, thanks everyone!
