bpf: Fix ref_obj_id for dynptr data slices in verifier

[ Upstream commit 883743422ced8c961ab05dc63ec81b75a4e56052 ]

When a data slice is obtained from a dynptr (through the bpf_dynptr_data API),
the ref obj id of the dynptr must be found and then associated with the data
slice.

The ref obj id of the dynptr must be found *before* the caller saved regs are
reset. Without this fix, the ref obj id tracking is not correct for
dynptrs that are at an offset from the frame pointer.

Please also note that the data slice's ref obj id must be assigned after the
ret types are parsed, since RET_PTR_TO_ALLOC_MEM-type return regs get
zero-marked.

Fixes: 34d4ef5775f7 ("bpf: Add dynptr data slices")
Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Acked-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20220809214055.4050604-1-joannelkoong@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 1141a35216a7ce16f8db3339965dcf2b62cb3e67..c127585ad429c41c4d35044bfc1c021276a31961 100644 (file)
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -504,7 +504,7 @@ static bool is_ptr_cast_function(enum bpf_func_id func_id)
                func_id == BPF_FUNC_skc_to_tcp_request_sock;
 }
 
-static bool is_dynptr_acquire_function(enum bpf_func_id func_id)
+static bool is_dynptr_ref_function(enum bpf_func_id func_id)
 {
        return func_id == BPF_FUNC_dynptr_data;
 }
@@ -518,7 +518,7 @@ static bool helper_multiple_ref_obj_use(enum bpf_func_id func_id,
                ref_obj_uses++;
        if (is_acquire_function(func_id, map))
                ref_obj_uses++;
-       if (is_dynptr_acquire_function(func_id))
+       if (is_dynptr_ref_function(func_id))
                ref_obj_uses++;
 
        return ref_obj_uses > 1;
@@ -7322,6 +7322,23 @@ static int check_helper_call(struct bpf_verifier_env *env, struct bpf_insn *insn
                        }
                }
                break;
+       case BPF_FUNC_dynptr_data:
+               for (i = 0; i < MAX_BPF_FUNC_REG_ARGS; i++) {
+                       if (arg_type_is_dynptr(fn->arg_type[i])) {
+                               if (meta.ref_obj_id) {
+                                       verbose(env, "verifier internal error: meta.ref_obj_id already set\n");
+                                       return -EFAULT;
+                               }
+                               /* Find the id of the dynptr we're tracking the reference of */
+                               meta.ref_obj_id = stack_slot_get_id(env, &regs[BPF_REG_1 + i]);
+                               break;
+                       }
+               }
+               if (i == MAX_BPF_FUNC_REG_ARGS) {
+                       verbose(env, "verifier internal error: no dynptr in bpf_dynptr_data()\n");
+                       return -EFAULT;
+               }
+               break;
        }
 
        if (err)
@@ -7444,7 +7461,7 @@ static int check_helper_call(struct bpf_verifier_env *env, struct bpf_insn *insn
                return -EFAULT;
        }
 
-       if (is_ptr_cast_function(func_id)) {
+       if (is_ptr_cast_function(func_id) || is_dynptr_ref_function(func_id)) {
                /* For release_reference() */
                regs[BPF_REG_0].ref_obj_id = meta.ref_obj_id;
        } else if (is_acquire_function(func_id, meta.map_ptr)) {
@@ -7456,21 +7473,6 @@ static int check_helper_call(struct bpf_verifier_env *env, struct bpf_insn *insn
                regs[BPF_REG_0].id = id;
                /* For release_reference() */
                regs[BPF_REG_0].ref_obj_id = id;
-       } else if (is_dynptr_acquire_function(func_id)) {
-               int dynptr_id = 0, i;
-
-               /* Find the id of the dynptr we're tracking the reference of */
-               for (i = 0; i < MAX_BPF_FUNC_REG_ARGS; i++) {
-                       if (arg_type_is_dynptr(fn->arg_type[i])) {
-                               if (dynptr_id) {
-                                       verbose(env, "verifier internal error: multiple dynptr args in func\n");
-                                       return -EFAULT;
-                               }
-                               dynptr_id = stack_slot_get_id(env, &regs[BPF_REG_1 + i]);
-                       }
-               }
-               /* For release_reference() */
-               regs[BPF_REG_0].ref_obj_id = dynptr_id;
        }
 
        do_refine_retval_range(regs, fn->ret_type, func_id, &meta);