bpf: teach verifier to recognize zero initialized stack

programs with function calls are often passing various
pointers via stack. When all calls are inlined llvm
flattens stack accesses and optimizes away extra branches.
When functions are not inlined it becomes the job of
the verifier to recognize zero initialized stack to avoid
exploring paths that program will not take.
The following program would fail otherwise:

ptr = &buffer_on_stack;
*ptr = 0;
...
func_call(.., ptr, ...) {
  if (..)
    *ptr = bpf_map_lookup();
}
...
if (*ptr != 0) {
  // Access (*ptr)->field is valid.
  // Without stack_zero tracking such (*ptr)->field access
  // will be rejected
}

since stack slots are no longer uniform invalid | spill | misc
add liveness marking to all slots, but do it in 8 byte chunks.
So if nothing was read or written in [fp-16, fp-9] range
it will be marked as LIVE_NONE.
If any byte in that range was read, it will be marked LIVE_READ
and stacksafe() check will perform byte-by-byte verification.
If all bytes in the range were written the slot will be
marked as LIVE_WRITTEN.
This significantly speeds up state equality comparison
and reduces total number of states processed.

                    before   after
bpf_lb-DLB_L3.o       2051    2003
bpf_lb-DLB_L4.o       3287    3164
bpf_lb-DUNKNOWN.o     1080    1080
bpf_lxc-DDROP_ALL.o   24980   12361
bpf_lxc-DUNKNOWN.o    34308   16605
bpf_netdev.o          15404   10962
bpf_overlay.o         7191    6679
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

include/linux/bpf_verifier.h

@@ -91,7 +91,8 @@ struct bpf_reg_state {
 enum bpf_stack_slot_type {
 	STACK_INVALID,    /* nothing was stored in this stack slot */
 	STACK_SPILL,      /* register spilled into stack */
-	STACK_MISC	  /* BPF program wrote some data into this slot */
+	STACK_MISC,	  /* BPF program wrote some data into this slot */
+	STACK_ZERO,	  /* BPF program wrote constant zero */
 };
 
 #define BPF_REG_SIZE 8	/* size of eBPF register in bytes */

kernel/bpf/verifier.c

@@ -311,6 +311,8 @@ static void print_verifier_state(struct bpf_verifier_env *env,
 			verbose(env, "=%s",
 				reg_type_str[state->stack[i].spilled_ptr.type]);
 		}
+		if (state->stack[i].slot_type[0] == STACK_ZERO)
+			verbose(env, " fp%d=0", (-i - 1) * BPF_REG_SIZE);
 	}
 	verbose(env, "\n");
 }
@@ -522,6 +524,13 @@ static void __mark_reg_known_zero(struct bpf_reg_state *reg)
 	__mark_reg_known(reg, 0);
 }
 
+static void __mark_reg_const_zero(struct bpf_reg_state *reg)
+{
+	__mark_reg_known(reg, 0);
+	reg->off = 0;
+	reg->type = SCALAR_VALUE;
+}
+
 static void mark_reg_known_zero(struct bpf_verifier_env *env,
 				struct bpf_reg_state *regs, u32 regno)
 {
@@ -937,6 +946,12 @@ static bool is_spillable_regtype(enum bpf_reg_type type)
 	}
 }
 
+/* Does this register contain a constant zero? */
+static bool register_is_null(struct bpf_reg_state *reg)
+{
+	return reg->type == SCALAR_VALUE && tnum_equals_const(reg->var_off, 0);
+}
+
 /* check_stack_read/write functions track spill/fill of registers,
  * stack boundary and alignment are checked in check_mem_access()
  */
@@ -984,12 +999,30 @@ static int check_stack_write(struct bpf_verifier_env *env,
 		for (i = 0; i < BPF_REG_SIZE; i++)
 			state->stack[spi].slot_type[i] = STACK_SPILL;
 	} else {
+		u8 type = STACK_MISC;
+
 		/* regular write of data into stack */
 		state->stack[spi].spilled_ptr = (struct bpf_reg_state) {};
 
+		/* only mark the slot as written if all 8 bytes were written
+		 * otherwise read propagation may incorrectly stop too soon
+		 * when stack slots are partially written.
+		 * This heuristic means that read propagation will be
+		 * conservative, since it will add reg_live_read marks
+		 * to stack slots all the way to first state when programs
+		 * writes+reads less than 8 bytes
+		 */
+		if (size == BPF_REG_SIZE)
+			state->stack[spi].spilled_ptr.live |= REG_LIVE_WRITTEN;
+
+		/* when we zero initialize stack slots mark them as such */
+		if (value_regno >= 0 &&
+		    register_is_null(&cur->regs[value_regno]))
+			type = STACK_ZERO;
+
 		for (i = 0; i < size; i++)
 			state->stack[spi].slot_type[(slot - i) % BPF_REG_SIZE] =
-				STACK_MISC;
+				type;
 	}
 	return 0;
 }
@@ -1030,6 +1063,14 @@ static void mark_stack_slot_read(struct bpf_verifier_env *env,
 	bool writes = parent == state->parent; /* Observe write marks */
 
 	while (parent) {
+		if (parent->frame[frameno]->allocated_stack <= slot * BPF_REG_SIZE)
+			/* since LIVE_WRITTEN mark is only done for full 8-byte
+			 * write the read marks are conservative and parent
+			 * state may not even have the stack allocated. In such case
+			 * end the propagation, since the loop reached beginning
+			 * of the function
+			 */
+			break;
 		/* if read wasn't screened by an earlier write ... */
 		if (writes && state->frame[frameno]->stack[slot].spilled_ptr.live & REG_LIVE_WRITTEN)
 			break;
@@ -1077,21 +1118,38 @@ static int check_stack_read(struct bpf_verifier_env *env,
 			 * which resets stack/reg liveness for state transitions
 			 */
 			state->regs[value_regno].live |= REG_LIVE_WRITTEN;
-			mark_stack_slot_read(env, vstate, vstate->parent, spi,
-					     reg_state->frameno);
 		}
+		mark_stack_slot_read(env, vstate, vstate->parent, spi,
+				     reg_state->frameno);
 		return 0;
 	} else {
+		int zeros = 0;
+
 		for (i = 0; i < size; i++) {
-			if (stype[(slot - i) % BPF_REG_SIZE] != STACK_MISC) {
-				verbose(env, "invalid read from stack off %d+%d size %d\n",
-					off, i, size);
-				return -EACCES;
+			if (stype[(slot - i) % BPF_REG_SIZE] == STACK_MISC)
+				continue;
+			if (stype[(slot - i) % BPF_REG_SIZE] == STACK_ZERO) {
+				zeros++;
+				continue;
 			}
+			verbose(env, "invalid read from stack off %d+%d size %d\n",
+				off, i, size);
+			return -EACCES;
+		}
+		mark_stack_slot_read(env, vstate, vstate->parent, spi,
+				     reg_state->frameno);
+		if (value_regno >= 0) {
+			if (zeros == size) {
+				/* any size read into register is zero extended,
+				 * so the whole register == const_zero
+				 */
+				__mark_reg_const_zero(&state->regs[value_regno]);
+			} else {
+				/* have read misc data from the stack */
+				mark_reg_unknown(env, state->regs, value_regno);
+			}
+			state->regs[value_regno].live |= REG_LIVE_WRITTEN;
 		}
-		if (value_regno >= 0)
-			/* have read misc data from the stack */
-			mark_reg_unknown(env, state->regs, value_regno);
 		return 0;
 	}
 }
@@ -1578,12 +1636,6 @@ static int check_xadd(struct bpf_verifier_env *env, int insn_idx, struct bpf_ins
 				BPF_SIZE(insn->code), BPF_WRITE, -1);
 }
 
-/* Does this register contain a constant zero? */
-static bool register_is_null(struct bpf_reg_state *reg)
-{
-	return reg->type == SCALAR_VALUE && tnum_equals_const(reg->var_off, 0);
-}
-
 /* when register 'regno' is passed into function that will read 'access_size'
  * bytes from that pointer, make sure that it's within stack boundary
  * and all elements of stack are initialized.
@@ -1633,15 +1685,30 @@ static int check_stack_boundary(struct bpf_verifier_env *env, int regno,
 	}
 
 	for (i = 0; i < access_size; i++) {
+		u8 *stype;
+
 		slot = -(off + i) - 1;
 		spi = slot / BPF_REG_SIZE;
-		if (state->allocated_stack <= slot ||
-		    state->stack[spi].slot_type[slot % BPF_REG_SIZE] !=
-			STACK_MISC) {
-			verbose(env, "invalid indirect read from stack off %d+%d size %d\n",
-				off, i, access_size);
-			return -EACCES;
+		if (state->allocated_stack <= slot)
+			goto err;
+		stype = &state->stack[spi].slot_type[slot % BPF_REG_SIZE];
+		if (*stype == STACK_MISC)
+			goto mark;
+		if (*stype == STACK_ZERO) {
+			/* helper can write anything into the stack */
+			*stype = STACK_MISC;
+			goto mark;
 		}
+err:
+		verbose(env, "invalid indirect read from stack off %d+%d size %d\n",
+			off, i, access_size);
+		return -EACCES;
+mark:
+		/* reading any byte out of 8-byte 'spill_slot' will cause
+		 * the whole slot to be marked as 'read'
+		 */
+		mark_stack_slot_read(env, env->cur_state, env->cur_state->parent,
+				     spi, state->frameno);
 	}
 	return update_stack_depth(env, state, off);
 }
@@ -4022,8 +4089,19 @@ static bool stacksafe(struct bpf_func_state *old,
 	for (i = 0; i < old->allocated_stack; i++) {
 		spi = i / BPF_REG_SIZE;
 
+		if (!(old->stack[spi].spilled_ptr.live & REG_LIVE_READ))
+			/* explored state didn't use this */
+			return true;
+
 		if (old->stack[spi].slot_type[i % BPF_REG_SIZE] == STACK_INVALID)
 			continue;
+		/* if old state was safe with misc data in the stack
+		 * it will be safe with zero-initialized stack.
+		 * The opposite is not true
+		 */
+		if (old->stack[spi].slot_type[i % BPF_REG_SIZE] == STACK_MISC &&
+		    cur->stack[spi].slot_type[i % BPF_REG_SIZE] == STACK_ZERO)
+			continue;
 		if (old->stack[spi].slot_type[i % BPF_REG_SIZE] !=
 		    cur->stack[spi].slot_type[i % BPF_REG_SIZE])
 			/* Ex: old explored (safe) state has STACK_SPILL in
@@ -4164,10 +4242,6 @@ static int propagate_liveness(struct bpf_verifier_env *env,
 		parent = vparent->frame[frame];
 		for (i = 0; i < state->allocated_stack / BPF_REG_SIZE &&
 			    i < parent->allocated_stack / BPF_REG_SIZE; i++) {
-			if (parent->stack[i].slot_type[0] != STACK_SPILL)
-				continue;
-			if (state->stack[i].slot_type[0] != STACK_SPILL)
-				continue;
 			if (parent->stack[i].spilled_ptr.live & REG_LIVE_READ)
 				continue;
 			if (state->stack[i].spilled_ptr.live & REG_LIVE_READ)
@@ -4247,8 +4321,7 @@ static int is_state_visited(struct bpf_verifier_env *env, int insn_idx)
 		struct bpf_func_state *frame = cur->frame[j];
 
 		for (i = 0; i < frame->allocated_stack / BPF_REG_SIZE; i++)
-			if (frame->stack[i].slot_type[0] == STACK_SPILL)
-				frame->stack[i].spilled_ptr.live = REG_LIVE_NONE;
+			frame->stack[i].spilled_ptr.live = REG_LIVE_NONE;
 	}
 	return 0;
 }