bpf: Allow trampoline re-attach for tracing and lsm programs

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Currently we don't allow re-attaching of trampolines. Once
it's detached, it can't be re-attach even when the program
is still loaded.

Adding the possibility to re-attach the loaded tracing and
lsm programs.

Fixing missing unlock with proper cleanup goto jump reported
by Julia.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: KP Singh <kpsingh@kernel.org>
Link: https://lore.kernel.org/bpf/20210414195147.1624932-2-jolsa@kernel.org

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This commit is contained in:

Jiri Olsa 2021-04-14 21:51:41 +02:00 • committed by Alexei Starovoitov

parent 0ea1041bfa

commit f3a9507554

2 changed files with 19 additions and 8 deletions

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23

kernel/bpf/syscall.c

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4

kernel/bpf/trampoline.c

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