diff options
| author | Ilya Leoshkevich <iii@linux.ibm.com> | 2025-05-12 22:57:30 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2025-05-14 17:48:57 -0700 |
| commit | 94bde253d3ae5d8a01cb958663b12daef1d06574 (patch) | |
| tree | dc34302a635c9c62ad1205e7b12e55110e550816 /kernel/bpf/bpf_struct_ops.c | |
| parent | 5f55f2168432298f5a55294831ab6a76a10cb3c3 (diff) | |
bpf: Pass the same orig_call value to trampoline functions
There is currently some confusion in the s390x JIT regarding whether
orig_call can be NULL and what that means. Originally the NULL value
was used to distinguish the struct_ops case, but this was superseded by
BPF_TRAMP_F_INDIRECT (see commit 0c970ed2f87c ("s390/bpf: Fix indirect
trampoline generation").
The remaining reason to have this check is that NULL can actually be
passed to the arch_bpf_trampoline_size() call - but not to the
respective arch_prepare_bpf_trampoline()! call - by
bpf_struct_ops_prepare_trampoline().
Remove this asymmetry by passing stub_func to both functions, so that
JITs may rely on orig_call never being NULL.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20250512221911.61314-2-iii@linux.ibm.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/bpf/bpf_struct_ops.c')
| -rw-r--r-- | kernel/bpf/bpf_struct_ops.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/bpf/bpf_struct_ops.c b/kernel/bpf/bpf_struct_ops.c index db13ee70d94d..96113633e391 100644 --- a/kernel/bpf/bpf_struct_ops.c +++ b/kernel/bpf/bpf_struct_ops.c @@ -601,7 +601,7 @@ int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks, if (model->ret_size > 0) flags |= BPF_TRAMP_F_RET_FENTRY_RET; - size = arch_bpf_trampoline_size(model, flags, tlinks, NULL); + size = arch_bpf_trampoline_size(model, flags, tlinks, stub_func); if (size <= 0) return size ? : -EFAULT; |