netfilter: x_tables: check for bogus target offset

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We're currently asserting that targetoff + targetsize <= nextoff.

Extend it to also check that targetoff is >= sizeof(xt_entry).
Since this is generic code, add an argument pointing to the start of the
match/target, we can then derive the base structure size from the delta.

We also need the e->elems pointer in a followup change to validate matches.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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Florian Westphal 2016-04-01 14:17:28 +02:00 • committed by Pablo Neira Ayuso

parent 7ed2abddd2

commit ce683e5f9d

5 changed files with 26 additions and 10 deletions

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include/linux/netfilter/x_tables.h

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