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| author | Daniel Borkmann <daniel@iogearbox.net> | 2018-06-15 02:30:47 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2018-06-15 11:14:25 -0700 |
| commit | 7d1982b4e335c1b184406b7566f6041bfe313c35 (patch) | |
| tree | 885f83b1f8e96c502c2939838d22e63756c7b011 /include | |
| parent | 26bf8a89d887c0686acef0f44eaadd49abfcab03 (diff) | |
| download | lwn-7d1982b4e335c1b184406b7566f6041bfe313c35.tar.gz lwn-7d1982b4e335c1b184406b7566f6041bfe313c35.zip | |
bpf: fix panic in prog load calls cleanup
While testing I found that when hitting error path in bpf_prog_load()
where we jump to free_used_maps and prog contained BPF to BPF calls
that were JITed earlier, then we never clean up the bpf_prog_kallsyms_add()
done under jit_subprogs(). Add proper API to make BPF kallsyms deletion
more clear and fix that.
Fixes: 1c2a088a6626 ("bpf: x64: add JIT support for multi-function programs")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/filter.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/filter.h b/include/linux/filter.h index 45fc0f5000d8..297c56fa9cee 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -961,6 +961,9 @@ static inline void bpf_prog_kallsyms_del(struct bpf_prog *fp) } #endif /* CONFIG_BPF_JIT */ +void bpf_prog_kallsyms_del_subprogs(struct bpf_prog *fp); +void bpf_prog_kallsyms_del_all(struct bpf_prog *fp); + #define BPF_ANC BIT(15) static inline bool bpf_needs_clear_a(const struct sock_filter *first) |