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net: filter: fix upper BPF instruction limit

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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: bd4cf0ed33 ("net: filter: rework/optimize internal BPF interpreter's instruction set")
Signed-off-by: Kees Cook <[email protected]>
Cc: [email protected] # v3.15+
Acked-by: Daniel Borkmann <[email protected]>
Acked-by: Alexei Starovoitov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Kees Cook 2014-06-18 15:34:57 -07:00 • committed by David S. Miller
commit 6f9a093b66
1 changed files with 1 additions and 1 deletions
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2
net/core/filter.c
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@ -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) {