Messages in this thread Patch in this message | | | From | Will Drewry <> | Subject | [PATCH v14 01/13] sk_run_filter: add BPF_S_ANC_SECCOMP_LD_W | Date | Mon, 12 Mar 2012 16:28:23 -0500 |
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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
v14: First cut using a single additional instruction ... v13: made bpf functions generic.
Suggested-by: Indan Zupancic <indan@nul.nu> Signed-off-by: Will Drewry <wad@chromium.org> --- include/linux/filter.h | 1 + net/core/filter.c | 5 +++++ 2 files changed, 6 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..3000931 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -350,6 +350,11 @@ 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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