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bpf: Introduce bpf_arch_text_invalidate for bpf_prog_pack

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Introduce bpf_arch_text_invalidate and use it to fill unused part of the
bpf_prog_pack with illegal instructions when a BPF program is freed.

Fixes: 57631054fa ("bpf: Introduce bpf_prog_pack allocator")
Fixes: 33c9805860 ("bpf: Introduce bpf_jit_binary_pack_[alloc|finalize|free]")
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220520235758.1858153-4-song@kernel.org
This commit is contained in:
Song Liu 2022-05-20 16:57:53 -07:00 • committed by Daniel Borkmann
parent aadd1b678e
commit fe736565ef
3 changed files with 14 additions and 0 deletions
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include/linux/bpf.h
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@ -2365,6 +2365,7 @@ int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
void *addr1, void *addr2);
void *bpf_arch_text_copy(void *dst, void *src, size_t len);
int bpf_arch_text_invalidate(void *dst, size_t len);
struct btf_id_set;
bool btf_id_set_contains(const struct btf_id_set *set, u32 id);