From 0c970ed2f87c058fe3ddeb4d7d8f64f72cf41d7a Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Fri, 15 Dec 2023 16:45:49 -0800 Subject: [PATCH] s390/bpf: Fix indirect trampoline generation The func_addr used to be NULL for indirect trampolines used by struct_ops. Now func_addr is a valid function pointer. Hence use BPF_TRAMP_F_INDIRECT flag to detect such condition. Fixes: 2cd3e3772e41 ("x86/cfi,bpf: Fix bpf_struct_ops CFI") Signed-off-by: Alexei Starovoitov Signed-off-by: Daniel Borkmann Reviewed-by: Ilya Leoshkevich Link: https://lore.kernel.org/bpf/20231216004549.78355-1-alexei.starovoitov@gmail.com --- arch/s390/net/bpf_jit_comp.c | 3 ++- tools/testing/selftests/bpf/DENYLIST.s390x | 2 -- 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c index cc129617480a2..7f0a7b97ef4ce 100644 --- a/arch/s390/net/bpf_jit_comp.c +++ b/arch/s390/net/bpf_jit_comp.c @@ -2362,7 +2362,8 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, return -ENOTSUPP; /* Return to %r14, since func_addr and %r0 are not available. */ - if (!func_addr && !(flags & BPF_TRAMP_F_ORIG_STACK)) + if ((!func_addr && !(flags & BPF_TRAMP_F_ORIG_STACK)) || + (flags & BPF_TRAMP_F_INDIRECT)) flags |= BPF_TRAMP_F_SKIP_FRAME; /* diff --git a/tools/testing/selftests/bpf/DENYLIST.s390x b/tools/testing/selftests/bpf/DENYLIST.s390x index d27aa42d11a49..1a63996c0304b 100644 --- a/tools/testing/selftests/bpf/DENYLIST.s390x +++ b/tools/testing/selftests/bpf/DENYLIST.s390x @@ -1,7 +1,5 @@ # TEMPORARY # Alphabetical order -dummy_st_ops/dummy_init_ret_value -dummy_st_ops/dummy_init_ptr_arg exceptions # JIT does not support calling kfunc bpf_throw (exceptions) get_stack_raw_tp # user_stack corrupted user stack (no backchain userspace) stacktrace_build_id # compare_map_keys stackid_hmap vs. stackmap err -2 errno 2 (?) -- 2.30.2