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author | Song Liu <song@kernel.org> | 2022-07-19 17:21:26 -0700 |
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committer | Daniel Borkmann <daniel@iogearbox.net> | 2022-07-22 22:04:37 +0200 |
commit | 00963a2e75a872e5fce4d0115ac2786ec86b57a6 (patch) | |
tree | 91073f9e37c12cf4321a60f5c1b20c307c64e199 /kernel/platform-feature.c | |
parent | 316cba62dfb7878b7353177e6a7da9cc0c979cde (diff) | |
download | linux-00963a2e75a872e5fce4d0115ac2786ec86b57a6.tar.bz2 |
bpf: Support bpf_trampoline on functions with IPMODIFY (e.g. livepatch)
When tracing a function with IPMODIFY ftrace_ops (livepatch), the bpf
trampoline must follow the instruction pointer saved on stack. This needs
extra handling for bpf trampolines with BPF_TRAMP_F_CALL_ORIG flag.
Implement bpf_tramp_ftrace_ops_func and use it for the ftrace_ops used
by BPF trampoline. This enables tracing functions with livepatch.
This also requires moving bpf trampoline to *_ftrace_direct_mult APIs.
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/all/20220602193706.2607681-2-song@kernel.org/
Link: https://lore.kernel.org/bpf/20220720002126.803253-5-song@kernel.org
Diffstat (limited to 'kernel/platform-feature.c')
0 files changed, 0 insertions, 0 deletions