Messages in this thread Patch in this message | | | From | Gilad Reti <> | Subject | [PATCH bpf 1/2] bpf: support PTR_TO_MEM{,_OR_NULL} register spilling | Date | Tue, 12 Jan 2021 11:14:03 +0200 |
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Add support for pointer to mem register spilling, to allow the verifier to track pointer to valid memory addresses. Such pointers are returned for example by a successful call of the bpf_ringbuf_reserve helper.
This patch was suggested as a solution by Yonghong Song.
The patch was partially contibuted by CyberArk Software, Inc.
Fixes: 457f44363a88 ("bpf: Implement BPF ring buffer and verifier support for it") Signed-off-by: Gilad Reti <gilad.reti@gmail.com> --- kernel/bpf/verifier.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 17270b8404f1..36af69fac591 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -2217,6 +2217,8 @@ static bool is_spillable_regtype(enum bpf_reg_type type) case PTR_TO_RDWR_BUF: case PTR_TO_RDWR_BUF_OR_NULL: case PTR_TO_PERCPU_BTF_ID: + case PTR_TO_MEM: + case PTR_TO_MEM_OR_NULL: return true; default: return false; -- 2.27.0
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