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bpf: Fix ref_obj_id for dynptr data slices in verifier 

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: 34d4ef5775 ("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>
This commit is contained in:
Joanne Koong 2022-08-09 14:40:54 -07:00 committed by Alexei Starovoitov
parent a7be0ab1eb
commit 883743422c
1 changed files with 20 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
kernel/bpf/verifier.c
View File

@ -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;
@ -7320,6 +7320,23 @@ 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)
@ -7457,7 +7474,7 @@ 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)) {
@ -7469,21 +7486,6 @@ 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);