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Message-Id: <1331781125-15658-2-git-send-email-wad@chromium.org>
Date: Wed, 14 Mar 2012 22:11:53 -0500
From: Will Drewry <wad@...omium.org>
To: linux-kernel@...r.kernel.org
Cc: linux-arch@...r.kernel.org,
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Will Drewry <wad@...omium.org>
Subject: [PATCH v15 01/13] sk_run_filter: add BPF_S_ANC_SECCOMP_LD_W
Introduces a new BPF ancillary instruction that all LD calls will be
mapped through when skb_run_filter() is being used for seccomp BPF. The
rewriting will be done using a secondary chk_filter function that is run
after skb_chk_filter.
The code change is guarded by CONFIG_SECCOMP_FILTER which is added,
along with the seccomp_bpf_load() function later in this series.
This is based on http://lkml.org/lkml/2012/3/2/141
v15: include seccomp.h explicitly for when seccomp_bpf_load exists.
v14: First cut using a single additional instruction
... v13: made bpf functions generic.
Suggested-by: Indan Zupancic <indan@....nu>
Signed-off-by: Will Drewry <wad@...omium.org>
---
include/linux/filter.h | 1 +
net/core/filter.c | 6 ++++++
2 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 8eeb205..aaa2e80 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -228,6 +228,7 @@ enum {
BPF_S_ANC_HATYPE,
BPF_S_ANC_RXHASH,
BPF_S_ANC_CPU,
+ BPF_S_ANC_SECCOMP_LD_W,
};
#endif /* __KERNEL__ */
diff --git a/net/core/filter.c b/net/core/filter.c
index 5dea452..d775edc 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -39,6 +39,7 @@
#include <linux/filter.h>
#include <linux/reciprocal_div.h>
#include <linux/ratelimit.h>
+#include <linux/seccomp.h>
/* No hurry in this branch */
static void *__load_pointer(const struct sk_buff *skb, int k, unsigned int size)
@@ -350,6 +351,11 @@ load_b:
A = 0;
continue;
}
+#ifdef CONFIG_SECCOMP_FILTER
+ case BPF_S_ANC_SECCOMP_LD_W:
+ A = seccomp_bpf_load(fentry->k);
+ continue;
+#endif
default:
WARN_RATELIMIT(1, "Unknown code:%u jt:%u tf:%u k:%u\n",
fentry->code, fentry->jt,
--
1.7.5.4
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