[PATCH 2/2] powerpc: bpf: use memset32() to pre-fill traps in BPF page(s)
From: Naveen N. Rao <hidden>
Date: 2017-03-27 19:38:30
Subsystem:
bpf jit for powerpc (32-bit and 64-bit), bpf [general] (safe dynamic programs and tools), linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Hari Bathini, Christophe Leroy, Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
Use the newly introduced memset32() to pre-fill BPF page(s) with trap instructions. Signed-off-by: Naveen N. Rao <redacted> --- arch/powerpc/net/bpf_jit_comp64.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c
index aee2bb817ac6..1a92ab6c245f 100644
--- a/arch/powerpc/net/bpf_jit_comp64.c
+++ b/arch/powerpc/net/bpf_jit_comp64.c@@ -25,11 +25,7 @@ int bpf_jit_enable __read_mostly; static void bpf_jit_fill_ill_insns(void *area, unsigned int size) { - int *p = area; - - /* Fill whole space with trap instructions */ - while (p < (int *)((char *)area + size)) - *p++ = BREAKPOINT_INSTRUCTION; + memset32(area, BREAKPOINT_INSTRUCTION, size/4); } static inline void bpf_flush_icache(void *start, void *end)
--
2.11.1