diff mbox series

[v6,08/18] bpf: disable CFI in dispatcher functions

Message ID 20210408182843.1754385-9-samitolvanen@google.com (mailing list archive)
State Awaiting Upstream
Delegated to: BPF
Headers show
Series Add support for Clang CFI | expand


Context Check Description
netdev/tree_selection success Not a local patch

Commit Message

Sami Tolvanen April 8, 2021, 6:28 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>
Tested-by: Nathan Chancellor <nathan@kernel.org>
 include/linux/bpf.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series


diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 3625f019767d..2f46f98479e1 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -650,7 +650,7 @@  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 *,
@@ -678,7 +678,7 @@  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 *,			\