diff options
| author | Kui-Feng Lee <kuifeng@fb.com> | 2022-05-10 23:59:21 +0300 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2022-05-11 07:58:31 +0300 |
| commit | 2fcc82411e74e5e6aba336561cf56fb899bfae4e (patch) | |
| tree | b56024a482d12e1bb739e561d7d60acf9e7f731e /arch/x86/net | |
| parent | e384c7b7b46d0a5f4bf3c554f963e6e9622d0ab1 (diff) | |
| download | linux-2fcc82411e74e5e6aba336561cf56fb899bfae4e.tar.xz | |
bpf, x86: Attach a cookie to fentry/fexit/fmod_ret/lsm.
Pass a cookie along with BPF_LINK_CREATE requests.
Add a bpf_cookie field to struct bpf_tracing_link to attach a cookie.
The cookie of a bpf_tracing_link is available by calling
bpf_get_attach_cookie when running the BPF program of the attached
link.
The value of a cookie will be set at bpf_tramp_run_ctx by the
trampoline of the link.
Signed-off-by: Kui-Feng Lee <kuifeng@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220510205923.3206889-4-kuifeng@fb.com
Diffstat (limited to 'arch/x86/net')
| -rw-r--r-- | arch/x86/net/bpf_jit_comp.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c index 1fbc5cf1c7a7..a2b6d197c226 100644 --- a/arch/x86/net/bpf_jit_comp.c +++ b/arch/x86/net/bpf_jit_comp.c @@ -1769,9 +1769,10 @@ static int invoke_bpf_prog(const struct btf_func_model *m, u8 **pprog, u8 *jmp_insn; int ctx_cookie_off = offsetof(struct bpf_tramp_run_ctx, bpf_cookie); struct bpf_prog *p = l->link.prog; + u64 cookie = l->cookie; - /* mov rdi, 0 */ - emit_mov_imm64(&prog, BPF_REG_1, 0, 0); + /* mov rdi, cookie */ + emit_mov_imm64(&prog, BPF_REG_1, (long) cookie >> 32, (u32) (long) cookie); /* Prepare struct bpf_tramp_run_ctx. * |