blob: 8986d90ab94221ee6b64cec9357c867e15c368bb [file] [log] [blame]
From 3c62e24c8c6469e06613ef5be49a3ed85d7db944 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= <>
Date: Mon, 16 Dec 2019 11:38:19 +0100
Subject: [PATCH] samples/bpf: Set -fno-stack-protector when building BPF
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commit 450278977acbf494a20367c22fbb38729772d1fc upstream.
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: <unknown>:0:0: in function bpf_prog1 i32 (%struct.__sk_buff*): A call to built-in function '__stack_chk_fail' is not supported.
Signed-off-by: Toke Høiland-Jørgensen <>
Signed-off-by: Alexei Starovoitov <>
Signed-off-by: Paul Gortmaker <>
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 491ef40ade0a..84ff0a116fe6 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -217,6 +217,7 @@ 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),)