net: bpf: arm: address randomize and write protect JIT code

This is the ARM variant for 51d1d536b5a ("x86: bpf_jit_comp: secure bpf
jit against spraying attacks").

It is now possible to implement it due to commits 93275052c89d ("ARM: mm:
Define set_memory_* functions for ARM") and 581270a40e8b ("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 <dborkman@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Mircea Gherzan <mgherzan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c
index a76623bcf722b2a576469e755ce2c5f301532916..2d1a5b93d91c5e566f3c74964bd21bc247425d93 100644 (file)
--- a/arch/arm/net/bpf_jit_32.c
+++ b/arch/arm/net/bpf_jit_32.c
@@ -12,7 +12,6 @@
 #include <linux/compiler.h>
 #include <linux/errno.h>
 #include <linux/filter.h>
-#include <linux/moduleloader.h>
 #include <linux/netdevice.h>
 #include <linux/string.h>
 #include <linux/slab.h>
@@ -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);
 }