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bpf: Support ->fill_link_info for perf_event

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By introducing support for ->fill_link_info to the perf_event link, users
gain the ability to inspect it using `bpftool link show`. While the current
approach involves accessing this information via `bpftool perf show`,
consolidating link information for all link types in one place offers
greater convenience. Additionally, this patch extends support to the
generic perf event, which is not currently accommodated by
`bpftool perf show`. While only the perf type and config are exposed to
userspace, other attributes such as sample_period and sample_freq are
ignored. It's important to note that if kptr_restrict is not permitted, the
probed address will not be exposed, maintaining security measures.

A new enum bpf_perf_event_type is introduced to help the user understand
which struct is relevant.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20230709025630.3735-9-laoar.shao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yafang Shao
2023-07-09 02:56:28 +00:00
committed by Andrii Nakryiko
parent b89ede420b
commit 4cd8e50d37
1 changed files with 35 additions and 0 deletions
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35
include/uapi/linux/bpf.h
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@@ -1057,6 +1057,16 @@ enum bpf_link_type {
MAX_BPF_LINK_TYPE,
};
enum bpf_perf_event_type {
BPF_PERF_EVENT_UNSPEC = 0,
BPF_PERF_EVENT_UPROBE = 1,
BPF_PERF_EVENT_URETPROBE = 2,
BPF_PERF_EVENT_KPROBE = 3,
BPF_PERF_EVENT_KRETPROBE = 4,
BPF_PERF_EVENT_TRACEPOINT = 5,
BPF_PERF_EVENT_EVENT = 6,
};
/* cgroup-bpf attach flags used in BPF_PROG_ATTACH command
*
* NONE(default): No further bpf programs allowed in the subtree.
@@ -6444,6 +6454,31 @@ struct bpf_link_info {
__u32 count; /* in/out: kprobe_multi function count */
__u32 flags;
} kprobe_multi;
struct {
__u32 type; /* enum bpf_perf_event_type */
__u32 :32;
union {
struct {
__aligned_u64 file_name; /* in/out */
__u32 name_len;
__u32 offset; /* offset from file_name */
} uprobe; /* BPF_PERF_EVENT_UPROBE, BPF_PERF_EVENT_URETPROBE */
struct {
__aligned_u64 func_name; /* in/out */
__u32 name_len;
__u32 offset; /* offset from func_name */
__u64 addr;
} kprobe; /* BPF_PERF_EVENT_KPROBE, BPF_PERF_EVENT_KRETPROBE */
struct {
__aligned_u64 tp_name; /* in/out */
__u32 name_len;
} tracepoint; /* BPF_PERF_EVENT_TRACEPOINT */
struct {
__u64 config;
__u32 type;
} event; /* BPF_PERF_EVENT_EVENT */
};
} perf_event;
};
} __attribute__((aligned(8)));