Implement bpf_arch_text_invalidate and use it to fill unused part of the bpf_prog_pack with trap instructions when a BPF program is freed.
Signed-off-by: Hari Bathini <[email protected]> --- arch/powerpc/net/bpf_jit_comp.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index 4f896222c579..c0036eb171f0 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -313,3 +313,18 @@ void *bpf_arch_text_copy(void *dst, void *src, size_t len) return ret; } + +int bpf_arch_text_invalidate(void *dst, size_t len) +{ + u32 insn = BREAKPOINT_INSTRUCTION; + void *ret; + + if (WARN_ON_ONCE(core_kernel_text((unsigned long)dst))) + return -EINVAL; + + mutex_lock(&text_mutex); + ret = bpf_patch_instructions(dst, &insn, len, true); + mutex_unlock(&text_mutex); + + return IS_ERR(ret) ? PTR_ERR(ret) : 0; +} -- 2.41.0
