Toke Høiland-Jørgensen 3aac1ead5e bpf: Move prog->aux->linked_prog and trampoline into bpf_link on attach ... In preparation for allowing multiple attachments of freplace programs, move the references to the target program and trampoline into the bpf_tracing_link structure when that is created. To do this atomically, introduce a new mutex in prog->aux to protect writing to the two pointers to target prog and trampoline, and rename the members to make it clear that they are related. With this change, it is no longer possible to attach the same tracing program multiple times (detaching in-between), since the reference from the tracing program to the target disappears on the first attach. However, since the next patch will let the caller supply an attach target, that will also make it possible to attach to the same place multiple times. Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/160138355059.48470.2503076992210324984.stgit@toke.dk		2020-09-29 13:09:23 -07:00
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iterators	bpf: Move prog->aux->linked_prog and trampoline into bpf_link on attach	2020-09-29 13:09:23 -07:00
.gitignore	bpf/preload: Make sure Makefile cleans up after itself, and add .gitignore	2020-09-29 11:15:01 -07:00
bpf_preload_kern.c	bpf: Add kernel module with user mode driver that populates bpffs.	2020-08-20 16:02:36 +02:00
bpf_preload_umd_blob.S	bpf: Add kernel module with user mode driver that populates bpffs.	2020-08-20 16:02:36 +02:00
bpf_preload.h	bpf: Add kernel module with user mode driver that populates bpffs.	2020-08-20 16:02:36 +02:00
Kconfig	bpf: Disallow BPF_PRELOAD in allmodconfig builds	2020-08-25 15:23:46 -07:00
Makefile	bpf/preload: Make sure Makefile cleans up after itself, and add .gitignore	2020-09-29 11:15:01 -07:00