From 55309dd3d4cd7420376a3de0526d6ed24ff8fa76 Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Mon, 8 Sep 2014 08:04:48 +0200 Subject: [PATCH] net: bpf: arm: address randomize and write protect JIT code This is the ARM variant for 314beb9bcab ("x86: bpf_jit_comp: secure bpf jit against spraying attacks"). It is now possible to implement it due to commits 75374ad47c64 ("ARM: mm: Define set_memory_* functions for ARM") and dca9aa92fc7c ("ARM: add DEBUG_SET_MODULE_RONX option to Kconfig") which added infrastructure for this facility. Thus, this patch makes sure the BPF generated JIT code is marked RO, as other kernel text sections, and also lets the generated JIT code start at a pseudo random offset instead on a page boundary. The holes are filled with illegal instructions. JIT tested on armv7hl with BPF test suite. Reference: http://mainisusuallyafunction.blogspot.com/2012/11/attacking-hardened-linux-systems-with.html Signed-off-by: Daniel Borkmann Signed-off-by: Alexei Starovoitov Acked-by: Mircea Gherzan Signed-off-by: David S. Miller --- arch/arm/net/bpf_jit_32.c | 32 ++++++++++++++++++++++++++------ 1 file changed, 26 insertions(+), 6 deletions(-) diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c index a76623bcf722..2d1a5b93d91c 100644 --- a/arch/arm/net/bpf_jit_32.c +++ b/arch/arm/net/bpf_jit_32.c @@ -12,7 +12,6 @@ #include #include #include -#include #include #include #include @@ -174,6 +173,15 @@ static inline bool is_load_to_a(u16 inst) } } +static void jit_fill_hole(void *area, unsigned int size) +{ + /* Insert illegal UND instructions. */ + u32 *ptr, fill_ins = 0xe7ffffff; + /* We are guaranteed to have aligned memory. */ + for (ptr = area; size >= sizeof(u32); size -= sizeof(u32)) + *ptr++ = fill_ins; +} + static void build_prologue(struct jit_ctx *ctx) { u16 reg_set = saved_regs(ctx); @@ -859,9 +867,11 @@ b_epilogue: void bpf_jit_compile(struct bpf_prog *fp) { + struct bpf_binary_header *header; struct jit_ctx ctx; unsigned tmp_idx; unsigned alloc_size; + u8 *target_ptr; if (!bpf_jit_enable) return; @@ -897,13 +907,15 @@ void bpf_jit_compile(struct bpf_prog *fp) /* there's nothing after the epilogue on ARMv7 */ build_epilogue(&ctx); #endif - alloc_size = 4 * ctx.idx; - ctx.target = module_alloc(alloc_size); - if (unlikely(ctx.target == NULL)) + header = bpf_jit_binary_alloc(alloc_size, &target_ptr, + 4, jit_fill_hole); + if (header == NULL) goto out; + ctx.target = (u32 *) target_ptr; ctx.idx = 0; + build_prologue(&ctx); build_body(&ctx); build_epilogue(&ctx); @@ -919,6 +931,7 @@ void bpf_jit_compile(struct bpf_prog *fp) /* there are 2 passes here */ bpf_jit_dump(fp->len, alloc_size, 2, ctx.target); + set_memory_ro((unsigned long)header, header->pages); fp->bpf_func = (void *)ctx.target; fp->jited = 1; out: @@ -928,8 +941,15 @@ out: void bpf_jit_free(struct bpf_prog *fp) { - if (fp->jited) - module_free(NULL, fp->bpf_func); + unsigned long addr = (unsigned long)fp->bpf_func & PAGE_MASK; + struct bpf_binary_header *header = (void *)addr; + if (!fp->jited) + goto free_filter; + + set_memory_rw(addr, header->pages); + bpf_jit_binary_free(header); + +free_filter: bpf_prog_unlock_free(fp); }