On 05/18/2013 04:37 AM, Eric Dumazet wrote:
From: Eric Dumazet <[email protected]>
hpa bringed into my attention some security related issues
with BPF JIT on x86.
This patch makes sure the bpf generated code is marked read only,
as other kernel text sections.
It also splits the unused space (we vmalloc() and only use a fraction of
the page) in two parts, so that the generated bpf code not starts at a
known offset in the page, but a pseudo random one.
Refs:
http://mainisusuallyafunction.blogspot.com/2012/11/attacking-hardened-linux-systems-with.html
Reported-by: H. Peter Anvin <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Great work !
Probably other archs could later on follow-up with setting to read-only, too.
Reviewed-by: Daniel Borkmann <[email protected]>
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