diff options
| author | Kees Cook <keescook@chromium.org> | 2014-06-18 15:34:57 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-06-18 17:04:15 -0700 |
| commit | 6f9a093b66ce7cacc110d8737c03686e80ecfda6 (patch) | |
| tree | 5a53f18d497fc955d613e8aa1d6aee50a5e47fa8 /net/core | |
| parent | ff5e92c1affe7166b3f6e7073e648ed65a6e2e59 (diff) | |
| download | linux-6f9a093b66ce7cacc110d8737c03686e80ecfda6.tar.gz | |
net: filter: fix upper BPF instruction limit
The original checks (via sk_chk_filter) for instruction count uses ">",
not ">=", so changing this in sk_convert_filter has the potential to break
existing seccomp filters that used exactly BPF_MAXINSNS many instructions.
Fixes: bd4cf0ed331a ("net: filter: rework/optimize internal BPF interpreter's instruction set")
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org # v3.15+
Acked-by: Daniel Borkmann <dborkman@redhat.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/filter.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index 735fad897496..a44e12cdde4c 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -840,7 +840,7 @@ int sk_convert_filter(struct sock_filter *prog, int len, BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK); BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG); - if (len <= 0 || len >= BPF_MAXINSNS) + if (len <= 0 || len > BPF_MAXINSNS) return -EINVAL; if (new_prog) { |