This is a note to let you know that I've just added the patch titled
samples/bpf: Fix compilation errors with cf-protection option
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
samples-bpf-fix-compilation-errors-with-cf-protectio.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 925b226d2139a5accf5b5b7b769ef5f153d4c927
Author: Jiangshan Yi <yijiangshan@xxxxxxxxxx>
Date: Thu Aug 15 21:55:24 2024 +0800
samples/bpf: Fix compilation errors with cf-protection option
[ Upstream commit fdf1c728fac541891ef1aa773bfd42728626769c ]
Currently, compiling the bpf programs will result the compilation errors
with the cf-protection option as follows in arm64 and loongarch64 machine
when using gcc 12.3.1 and clang 17.0.6. This commit fixes the compilation
errors by limited the cf-protection option only used in x86 platform.
[root@localhost linux]# make M=samples/bpf
......
CLANG-bpf samples/bpf/xdp2skb_meta_kern.o
error: option 'cf-protection=return' cannot be specified on this target
error: option 'cf-protection=branch' cannot be specified on this target
2 errors generated.
CLANG-bpf samples/bpf/syscall_tp_kern.o
error: option 'cf-protection=return' cannot be specified on this target
error: option 'cf-protection=branch' cannot be specified on this target
2 errors generated.
......
Fixes: 34f6e38f58db ("samples/bpf: fix warning with ignored-attributes")
Reported-by: Jiangshan Yi <yijiangshan@xxxxxxxxxx>
Signed-off-by: Jiangshan Yi <yijiangshan@xxxxxxxxxx>
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Tested-by: Qiang Wang <wangqiang1@xxxxxxxxxx>
Link: https://lore.kernel.org/bpf/20240815135524.140675-1-13667453960@xxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 4ccf4236031c1..3fa16412db15c 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -166,6 +166,10 @@ BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/include/asm/mach-generic
endif
endif
+ifeq ($(ARCH), x86)
+BPF_EXTRA_CFLAGS += -fcf-protection
+endif
+
TPROGS_CFLAGS += -Wall -O2
TPROGS_CFLAGS += -Wmissing-prototypes
TPROGS_CFLAGS += -Wstrict-prototypes
@@ -394,7 +398,7 @@ $(obj)/%.o: $(src)/%.c
-Wno-gnu-variable-sized-type-not-at-end \
-Wno-address-of-packed-member -Wno-tautological-compare \
-Wno-unknown-warning-option $(CLANG_ARCH_ARGS) \
- -fno-asynchronous-unwind-tables -fcf-protection \
+ -fno-asynchronous-unwind-tables \
-I$(srctree)/samples/bpf/ -include asm_goto_workaround.h \
-O2 -emit-llvm -Xclang -disable-llvm-passes -c $< -o - | \
$(OPT) -O2 -mtriple=bpf-pc-linux | $(LLVM_DIS) | \
