This is a note to let you know that I've just added the patch titled
net: filter: fix upper BPF instruction limit
to the 3.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-filter-fix-upper-bpf-instruction-limit.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From foo@baz Sat Jul 26 10:16:13 PDT 2014
From: Kees Cook <[email protected]>
Date: Wed, 18 Jun 2014 15:34:57 -0700
Subject: net: filter: fix upper BPF instruction limit
From: Kees Cook <[email protected]>
[ Upstream commit 6f9a093b66ce7cacc110d8737c03686e80ecfda6 ]
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 <[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]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/core/filter.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -872,7 +872,7 @@ int sk_convert_filter(struct sock_filter
BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK);
BUILD_BUG_ON(FP_REG + 1 != MAX_BPF_REG);
- if (len <= 0 || len >= BPF_MAXINSNS)
+ if (len <= 0 || len > BPF_MAXINSNS)
return -EINVAL;
if (new_prog) {
Patches currently in stable-queue which might be from [email protected] are
queue-3.15/net-filter-fix-upper-bpf-instruction-limit.patch
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