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-rw-r--r--kernel/bpf/core.c4
-rw-r--r--kernel/bpf/inode.c2
-rw-r--r--kernel/bpf/verifier.c30
3 files changed, 24 insertions, 12 deletions
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index f1e8a0def99b..b94a36550591 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -231,7 +231,7 @@ bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
hdr->pages = size / PAGE_SIZE;
hole = min_t(unsigned int, size - (proglen + sizeof(*hdr)),
PAGE_SIZE - sizeof(*hdr));
- start = (prandom_u32() % hole) & ~(alignment - 1);
+ start = (get_random_int() % hole) & ~(alignment - 1);
/* Leave a random number of instructions before BPF code. */
*image_ptr = &hdr->image[start];
@@ -251,7 +251,7 @@ static int bpf_jit_blind_insn(const struct bpf_insn *from,
struct bpf_insn *to_buff)
{
struct bpf_insn *to = to_buff;
- u32 imm_rnd = prandom_u32();
+ u32 imm_rnd = get_random_int();
s16 off;
BUILD_BUG_ON(BPF_REG_AX + 1 != MAX_BPF_JIT_REG);
diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c
index 71b75d9c81da..04be7021f848 100644
--- a/kernel/bpf/inode.c
+++ b/kernel/bpf/inode.c
@@ -357,7 +357,7 @@ static int bpf_fill_super(struct super_block *sb, void *data, int silent)
static struct dentry *bpf_mount(struct file_system_type *type, int flags,
const char *dev_name, void *data)
{
- return mount_ns(type, flags, current->nsproxy->mnt_ns, bpf_fill_super);
+ return mount_nodev(type, flags, data, bpf_fill_super);
}
static struct file_system_type bpf_fs_type = {
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index a08d66215245..668e07903c8f 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -683,15 +683,11 @@ static int check_packet_access(struct verifier_env *env, u32 regno, int off,
{
struct reg_state *regs = env->cur_state.regs;
struct reg_state *reg = &regs[regno];
- int linear_size = (int) reg->range - (int) reg->off;
- if (linear_size < 0 || linear_size >= MAX_PACKET_OFF) {
- verbose("verifier bug\n");
- return -EFAULT;
- }
- if (off < 0 || off + size > linear_size) {
- verbose("invalid access to packet, off=%d size=%d, allowed=%d\n",
- off, size, linear_size);
+ off += reg->off;
+ if (off < 0 || off + size > reg->range) {
+ verbose("invalid access to packet, off=%d size=%d, R%d(id=%d,off=%d,r=%d)\n",
+ off, size, regno, reg->id, reg->off, reg->range);
return -EACCES;
}
return 0;
@@ -1249,6 +1245,7 @@ static int check_packet_ptr_add(struct verifier_env *env, struct bpf_insn *insn)
struct reg_state *regs = env->cur_state.regs;
struct reg_state *dst_reg = &regs[insn->dst_reg];
struct reg_state *src_reg = &regs[insn->src_reg];
+ struct reg_state tmp_reg;
s32 imm;
if (BPF_SRC(insn->code) == BPF_K) {
@@ -1271,6 +1268,19 @@ add_imm:
*/
dst_reg->off += imm;
} else {
+ if (src_reg->type == PTR_TO_PACKET) {
+ /* R6=pkt(id=0,off=0,r=62) R7=imm22; r7 += r6 */
+ tmp_reg = *dst_reg; /* save r7 state */
+ *dst_reg = *src_reg; /* copy pkt_ptr state r6 into r7 */
+ src_reg = &tmp_reg; /* pretend it's src_reg state */
+ /* if the checks below reject it, the copy won't matter,
+ * since we're rejecting the whole program. If all ok,
+ * then imm22 state will be added to r7
+ * and r7 will be pkt(id=0,off=22,r=62) while
+ * r6 will stay as pkt(id=0,off=0,r=62)
+ */
+ }
+
if (src_reg->type == CONST_IMM) {
/* pkt_ptr += reg where reg is known constant */
imm = src_reg->imm;
@@ -1569,7 +1579,9 @@ static int check_alu_op(struct verifier_env *env, struct bpf_insn *insn)
return 0;
} else if (opcode == BPF_ADD &&
BPF_CLASS(insn->code) == BPF_ALU64 &&
- dst_reg->type == PTR_TO_PACKET) {
+ (dst_reg->type == PTR_TO_PACKET ||
+ (BPF_SRC(insn->code) == BPF_X &&
+ regs[insn->src_reg].type == PTR_TO_PACKET))) {
/* ptr_to_packet += K|X */
return check_packet_ptr_add(env, insn);
} else if (BPF_CLASS(insn->code) == BPF_ALU64 &&