From e95240ede0cbe3aa35bbb12bf7eb39e93c7c6e61 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Mon, 18 Sep 2023 16:07:27 +0200 Subject: [PATCH] bpf: Disable exceptions when CONFIG_UNWINDER_FRAME_POINTER=y The build with CONFIG_UNWINDER_FRAME_POINTER=y is broken for current exceptions feature as it assumes ORC unwinder specific fields in the unwind_state. Disable exceptions when frame_pointer unwinder is enabled for now. Fixes: fd5d27b70188 ("arch/x86: Implement arch_bpf_stack_walk") Reported-by: Eric Dumazet Signed-off-by: Kumar Kartikeya Dwivedi --- arch/x86/net/bpf_jit_comp.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c index 84005f2114e0..8c10d9abc239 100644 --- a/arch/x86/net/bpf_jit_comp.c +++ b/arch/x86/net/bpf_jit_comp.c @@ -3003,16 +3003,15 @@ void bpf_jit_free(struct bpf_prog *prog) bool bpf_jit_supports_exceptions(void) { /* We unwind through both kernel frames (starting from within bpf_throw - * call) and BPF frames. Therefore we require one of ORC or FP unwinder - * to be enabled to walk kernel frames and reach BPF frames in the stack - * trace. + * call) and BPF frames. Therefore we require ORC unwinder to be enabled + * to walk kernel frames and reach BPF frames in the stack trace. */ - return IS_ENABLED(CONFIG_UNWINDER_ORC) || IS_ENABLED(CONFIG_UNWINDER_FRAME_POINTER); + return IS_ENABLED(CONFIG_UNWINDER_ORC); } void arch_bpf_stack_walk(bool (*consume_fn)(void *cookie, u64 ip, u64 sp, u64 bp), void *cookie) { -#if defined(CONFIG_UNWINDER_ORC) || defined(CONFIG_UNWINDER_FRAME_POINTER) +#if defined(CONFIG_UNWINDER_ORC) struct unwind_state state; unsigned long addr; -- 2.41.0