From: Toke Høiland-Jørgensen Date: Mon, 16 Dec 2019 10:38:19 +0000 (+0100) Subject: samples/bpf: Set -fno-stack-protector when building BPF programs X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=450278977acbf494a20367c22fbb38729772d1fc;p=openwrt%2Fstaging%2Fblogic.git samples/bpf: Set -fno-stack-protector when building BPF programs It seems Clang can in some cases turn on stack protection by default, which doesn't work with BPF. This was reported once before[0], but it seems the flag to explicitly turn off the stack protector wasn't added to the Makefile, so do that now. The symptom of this is compile errors like the following: error: :0:0: in function bpf_prog1 i32 (%struct.__sk_buff*): A call to built-in function '__stack_chk_fail' is not supported. [0] https://www.spinics.net/lists/netdev/msg556400.html Signed-off-by: Toke Høiland-Jørgensen Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20191216103819.359535-1-toke@redhat.com --- diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index 227077ae66ed..5b89c0370f33 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -236,6 +236,7 @@ BTF_LLVM_PROBE := $(shell echo "int main() { return 0; }" | \ readelf -S ./llvm_btf_verify.o | grep BTF; \ /bin/rm -f ./llvm_btf_verify.o) +BPF_EXTRA_CFLAGS += -fno-stack-protector ifneq ($(BTF_LLVM_PROBE),) BPF_EXTRA_CFLAGS += -g else