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bpf: Add support for BTF pointers to interpreter

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Pointer to BTF object is a pointer to kernel object or NULL.
The memory access in the interpreter has to be done via probe_kernel_read
to avoid page faults.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20191016032505.2089704-9-ast@kernel.org
This commit is contained in:
Alexei Starovoitov 2019-10-15 20:25:02 -07:00 • committed by Daniel Borkmann
parent ac4414b5ca
commit 2a02759ef5
3 changed files with 30 additions and 0 deletions
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3
include/linux/filter.h
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@ -65,6 +65,9 @@ struct ctl_table_header;
/* unused opcode to mark special call to bpf_tail_call() helper */
#define BPF_TAIL_CALL 0xf0
/* unused opcode to mark special load instruction. Same as BPF_ABS */
#define BPF_PROBE_MEM 0x20
/* unused opcode to mark call to interpreter with arguments */
#define BPF_CALL_ARGS 0xe0