bpf: introduce bpf_get_current_task() helper

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over time there were multiple requests to access different data
structures and fields of task_struct current, so finally add
the helper to access 'current' as-is. Tracing bpf programs will do
the rest of walking the pointers via bpf_probe_read().
Note that current can be null and bpf program has to deal it with,
but even dumb passing null into bpf_probe_read() is still safe.

Suggested-by: Brendan Gregg <brendan.d.gregg@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Alexei Starovoitov 2016-07-06 22:38:36 -07:00 • committed by David S. Miller

parent d390238c4f

commit 606274c5ab

2 changed files with 20 additions and 0 deletions

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7

include/uapi/linux/bpf.h

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13

kernel/trace/bpf_trace.c

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