1 files changed, 85 insertions, 4 deletions

diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index aa6d98154106..1eb4f1303756 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -105,19 +105,29 @@ struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
 	gfp_t gfp_flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO |
 			  gfp_extra_flags;
 	struct bpf_prog *fp;
+	u32 pages, delta;
+	int ret;
 
 	BUG_ON(fp_old == NULL);
 
 	size = round_up(size, PAGE_SIZE);
-	if (size <= fp_old->pages * PAGE_SIZE)
+	pages = size / PAGE_SIZE;
+	if (pages <= fp_old->pages)
 		return fp_old;
 
+	delta = pages - fp_old->pages;
+	ret = __bpf_prog_charge(fp_old->aux->user, delta);
+	if (ret)
+		return NULL;
+
 	fp = __vmalloc(size, gfp_flags, PAGE_KERNEL);
-	if (fp != NULL) {
+	if (fp == NULL) {
+		__bpf_prog_uncharge(fp_old->aux->user, delta);
+	} else {
 		kmemcheck_annotate_bitfield(fp, meta);
 
 		memcpy(fp, fp_old, fp_old->pages * PAGE_SIZE);
-		fp->pages = size / PAGE_SIZE;
+		fp->pages = pages;
 		fp->aux->prog = fp;
 
 		/* We keep fp->aux from fp_old around in the new
@@ -136,6 +146,76 @@ void __bpf_prog_free(struct bpf_prog *fp)
 	vfree(fp);
 }
 
+int bpf_prog_calc_digest(struct bpf_prog *fp)
+{
+	const u32 bits_offset = SHA_MESSAGE_BYTES - sizeof(__be64);
+	u32 raw_size = bpf_prog_digest_scratch_size(fp);
+	u32 ws[SHA_WORKSPACE_WORDS];
+	u32 i, bsize, psize, blocks;
+	struct bpf_insn *dst;
+	bool was_ld_map;
+	u8 *raw, *todo;
+	__be32 *result;
+	__be64 *bits;
+
+	raw = vmalloc(raw_size);
+	if (!raw)
+		return -ENOMEM;
+
+	sha_init(fp->digest);
+	memset(ws, 0, sizeof(ws));
+
+	/* We need to take out the map fd for the digest calculation
+	 * since they are unstable from user space side.
+	 */
+	dst = (void *)raw;
+	for (i = 0, was_ld_map = false; i < fp->len; i++) {
+		dst[i] = fp->insnsi[i];
+		if (!was_ld_map &&
+		    dst[i].code == (BPF_LD | BPF_IMM | BPF_DW) &&
+		    dst[i].src_reg == BPF_PSEUDO_MAP_FD) {
+			was_ld_map = true;
+			dst[i].imm = 0;
+		} else if (was_ld_map &&
+			   dst[i].code == 0 &&
+			   dst[i].dst_reg == 0 &&
+			   dst[i].src_reg == 0 &&
+			   dst[i].off == 0) {
+			was_ld_map = false;
+			dst[i].imm = 0;
+		} else {
+			was_ld_map = false;
+		}
+	}
+
+	psize = bpf_prog_insn_size(fp);
+	memset(&raw[psize], 0, raw_size - psize);
+	raw[psize++] = 0x80;
+
+	bsize  = round_up(psize, SHA_MESSAGE_BYTES);
+	blocks = bsize / SHA_MESSAGE_BYTES;
+	todo   = raw;
+	if (bsize - psize >= sizeof(__be64)) {
+		bits = (__be64 *)(todo + bsize - sizeof(__be64));
+	} else {
+		bits = (__be64 *)(todo + bsize + bits_offset);
+		blocks++;
+	}
+	*bits = cpu_to_be64((psize - 1) << 3);
+
+	while (blocks--) {
+		sha_transform(fp->digest, todo, ws);
+		todo += SHA_MESSAGE_BYTES;
+	}
+
+	result = (__force __be32 *)fp->digest;
+	for (i = 0; i < SHA_DIGEST_WORDS; i++)
+		result[i] = cpu_to_be32(fp->digest[i]);
+
+	vfree(raw);
+	return 0;
+}
+
 static bool bpf_is_jmp_and_has_target(const struct bpf_insn *insn)
 {
 	return BPF_CLASS(insn->code) == BPF_JMP  &&
@@ -1043,6 +1123,7 @@ const struct bpf_func_proto bpf_map_delete_elem_proto __weak;
 
 const struct bpf_func_proto bpf_get_prandom_u32_proto __weak;
 const struct bpf_func_proto bpf_get_smp_processor_id_proto __weak;
+const struct bpf_func_proto bpf_get_numa_node_id_proto __weak;
 const struct bpf_func_proto bpf_ktime_get_ns_proto __weak;
 
 const struct bpf_func_proto bpf_get_current_pid_tgid_proto __weak;
@@ -1077,7 +1158,7 @@ struct bpf_prog * __weak bpf_int_jit_compile(struct bpf_prog *prog)
 	return prog;
 }
 
-bool __weak bpf_helper_changes_skb_data(void *func)
+bool __weak bpf_helper_changes_pkt_data(void *func)
 {
 	return false;
 }