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[v2,08/17] bpf: disable CFI in dispatcher functions

Message ID 20210318171111.706303-9-samitolvanen@google.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Add support for Clang CFI | expand

Checks

Context Check Description
netdev/tree_selection success Not a local patch

Commit Message

Sami Tolvanen March 18, 2021, 5:11 p.m. UTC 
BPF dispatcher functions are patched at runtime to perform direct
instead of indirect calls. Disable CFI for the dispatcher functions to
avoid conflicts.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
---
 include/linux/bpf.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index cccaef1088ea..9acdca574527 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -635,7 +635,7 @@  struct bpf_dispatcher {
 	struct bpf_ksym ksym;
 };
 
-static __always_inline unsigned int bpf_dispatcher_nop_func(
+static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func(
 	const void *ctx,
 	const struct bpf_insn *insnsi,
 	unsigned int (*bpf_func)(const void *,
@@ -663,7 +663,7 @@  void bpf_trampoline_put(struct bpf_trampoline *tr);
 }
 
 #define DEFINE_BPF_DISPATCHER(name)					\
-	noinline unsigned int bpf_dispatcher_##name##_func(		\
+	noinline __nocfi unsigned int bpf_dispatcher_##name##_func(	\
 		const void *ctx,					\
 		const struct bpf_insn *insnsi,				\
 		unsigned int (*bpf_func)(const void *,			\