bpf: Check bloom filter map value size

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[ Upstream commit a8d89feba7 ]

This patch adds a missing check to bloom filter creating, rejecting
values above KMALLOC_MAX_SIZE. This brings the bloom map in line with
many other map types.

The lack of this protection can cause kernel crashes for value sizes
that overflow int's. Such a crash was caught by syzkaller. The next
patch adds more guard-rails at a lower level.

Signed-off-by: Andrei Matei <andreimatei1@gmail.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240327024245.318299-2-andreimatei1@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Andrei Matei 2024-03-26 22:42:44 -04:00 • committed by Greg Kroah-Hartman

parent 41dc679159

commit 608e13706c

2 changed files with 19 additions and 0 deletions

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13

kernel/bpf/bloom_filter.c

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6

tools/testing/selftests/bpf/prog_tests/bloom_filter_map.c

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