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bpf: Support PTR_TO_MEM{,_OR_NULL} register spilling

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Add support for pointer to mem register spilling, to allow the verifier
to track pointers to valid memory addresses. Such pointers are returned
for example by a successful call of the bpf_ringbuf_reserve helper.

The patch was partially contributed by CyberArk Software, Inc.

Fixes: 457f44363a ("bpf: Implement BPF ring buffer and verifier support for it")
Suggested-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Gilad Reti <gilad.reti@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: KP Singh <kpsingh@kernel.org>
Link: https://lore.kernel.org/bpf/20210113053810.13518-1-gilad.reti@gmail.com
This commit is contained in:
Gilad Reti 2021-01-13 07:38:07 +02:00 committed by Alexei Starovoitov
parent 7ac6ad0511
commit 744ea4e388
1 changed files with 2 additions and 0 deletions
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kernel/bpf/verifier.c
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@ -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;