mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-05 18:39:59 +00:00
![Eduard Zingerman](/assets/img/avatar_default.png)
[ Upstream commit 1ffc85d929
]
Make sure that the following unsafe example is rejected by verifier:
1: r9 = ... some pointer with range X ...
2: r6 = ... unbound scalar ID=a ...
3: r7 = ... unbound scalar ID=b ...
4: if (r6 > r7) goto +1
5: r6 = r7
6: if (r6 > X) goto ...
755 lines
26 KiB
C
755 lines
26 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
|
|
*/
|
|
#ifndef _LINUX_BPF_VERIFIER_H
|
|
#define _LINUX_BPF_VERIFIER_H 1
|
|
|
|
#include <linux/bpf.h> /* for enum bpf_reg_type */
|
|
#include <linux/btf.h> /* for struct btf and btf_id() */
|
|
#include <linux/filter.h> /* for MAX_BPF_STACK */
|
|
#include <linux/tnum.h>
|
|
|
|
/* Maximum variable offset umax_value permitted when resolving memory accesses.
|
|
* In practice this is far bigger than any realistic pointer offset; this limit
|
|
* ensures that umax_value + (int)off + (int)size cannot overflow a u64.
|
|
*/
|
|
#define BPF_MAX_VAR_OFF (1 << 29)
|
|
/* Maximum variable size permitted for ARG_CONST_SIZE[_OR_ZERO]. This ensures
|
|
* that converting umax_value to int cannot overflow.
|
|
*/
|
|
#define BPF_MAX_VAR_SIZ (1 << 29)
|
|
/* size of tmp_str_buf in bpf_verifier.
|
|
* we need at least 306 bytes to fit full stack mask representation
|
|
* (in the "-8,-16,...,-512" form)
|
|
*/
|
|
#define TMP_STR_BUF_LEN 320
|
|
|
|
/* Liveness marks, used for registers and spilled-regs (in stack slots).
|
|
* Read marks propagate upwards until they find a write mark; they record that
|
|
* "one of this state's descendants read this reg" (and therefore the reg is
|
|
* relevant for states_equal() checks).
|
|
* Write marks collect downwards and do not propagate; they record that "the
|
|
* straight-line code that reached this state (from its parent) wrote this reg"
|
|
* (and therefore that reads propagated from this state or its descendants
|
|
* should not propagate to its parent).
|
|
* A state with a write mark can receive read marks; it just won't propagate
|
|
* them to its parent, since the write mark is a property, not of the state,
|
|
* but of the link between it and its parent. See mark_reg_read() and
|
|
* mark_stack_slot_read() in kernel/bpf/verifier.c.
|
|
*/
|
|
enum bpf_reg_liveness {
|
|
REG_LIVE_NONE = 0, /* reg hasn't been read or written this branch */
|
|
REG_LIVE_READ32 = 0x1, /* reg was read, so we're sensitive to initial value */
|
|
REG_LIVE_READ64 = 0x2, /* likewise, but full 64-bit content matters */
|
|
REG_LIVE_READ = REG_LIVE_READ32 | REG_LIVE_READ64,
|
|
REG_LIVE_WRITTEN = 0x4, /* reg was written first, screening off later reads */
|
|
REG_LIVE_DONE = 0x8, /* liveness won't be updating this register anymore */
|
|
};
|
|
|
|
/* For every reg representing a map value or allocated object pointer,
|
|
* we consider the tuple of (ptr, id) for them to be unique in verifier
|
|
* context and conside them to not alias each other for the purposes of
|
|
* tracking lock state.
|
|
*/
|
|
struct bpf_active_lock {
|
|
/* This can either be reg->map_ptr or reg->btf. If ptr is NULL,
|
|
* there's no active lock held, and other fields have no
|
|
* meaning. If non-NULL, it indicates that a lock is held and
|
|
* id member has the reg->id of the register which can be >= 0.
|
|
*/
|
|
void *ptr;
|
|
/* This will be reg->id */
|
|
u32 id;
|
|
};
|
|
|
|
#define ITER_PREFIX "bpf_iter_"
|
|
|
|
enum bpf_iter_state {
|
|
BPF_ITER_STATE_INVALID, /* for non-first slot */
|
|
BPF_ITER_STATE_ACTIVE,
|
|
BPF_ITER_STATE_DRAINED,
|
|
};
|
|
|
|
struct bpf_reg_state {
|
|
/* Ordering of fields matters. See states_equal() */
|
|
enum bpf_reg_type type;
|
|
/* Fixed part of pointer offset, pointer types only */
|
|
s32 off;
|
|
union {
|
|
/* valid when type == PTR_TO_PACKET */
|
|
int range;
|
|
|
|
/* valid when type == CONST_PTR_TO_MAP | PTR_TO_MAP_VALUE |
|
|
* PTR_TO_MAP_VALUE_OR_NULL
|
|
*/
|
|
struct {
|
|
struct bpf_map *map_ptr;
|
|
/* To distinguish map lookups from outer map
|
|
* the map_uid is non-zero for registers
|
|
* pointing to inner maps.
|
|
*/
|
|
u32 map_uid;
|
|
};
|
|
|
|
/* for PTR_TO_BTF_ID */
|
|
struct {
|
|
struct btf *btf;
|
|
u32 btf_id;
|
|
};
|
|
|
|
struct { /* for PTR_TO_MEM | PTR_TO_MEM_OR_NULL */
|
|
u32 mem_size;
|
|
u32 dynptr_id; /* for dynptr slices */
|
|
};
|
|
|
|
/* For dynptr stack slots */
|
|
struct {
|
|
enum bpf_dynptr_type type;
|
|
/* A dynptr is 16 bytes so it takes up 2 stack slots.
|
|
* We need to track which slot is the first slot
|
|
* to protect against cases where the user may try to
|
|
* pass in an address starting at the second slot of the
|
|
* dynptr.
|
|
*/
|
|
bool first_slot;
|
|
} dynptr;
|
|
|
|
/* For bpf_iter stack slots */
|
|
struct {
|
|
/* BTF container and BTF type ID describing
|
|
* struct bpf_iter_<type> of an iterator state
|
|
*/
|
|
struct btf *btf;
|
|
u32 btf_id;
|
|
/* packing following two fields to fit iter state into 16 bytes */
|
|
enum bpf_iter_state state:2;
|
|
int depth:30;
|
|
} iter;
|
|
|
|
/* Max size from any of the above. */
|
|
struct {
|
|
unsigned long raw1;
|
|
unsigned long raw2;
|
|
} raw;
|
|
|
|
u32 subprogno; /* for PTR_TO_FUNC */
|
|
};
|
|
/* For scalar types (SCALAR_VALUE), this represents our knowledge of
|
|
* the actual value.
|
|
* For pointer types, this represents the variable part of the offset
|
|
* from the pointed-to object, and is shared with all bpf_reg_states
|
|
* with the same id as us.
|
|
*/
|
|
struct tnum var_off;
|
|
/* Used to determine if any memory access using this register will
|
|
* result in a bad access.
|
|
* These refer to the same value as var_off, not necessarily the actual
|
|
* contents of the register.
|
|
*/
|
|
s64 smin_value; /* minimum possible (s64)value */
|
|
s64 smax_value; /* maximum possible (s64)value */
|
|
u64 umin_value; /* minimum possible (u64)value */
|
|
u64 umax_value; /* maximum possible (u64)value */
|
|
s32 s32_min_value; /* minimum possible (s32)value */
|
|
s32 s32_max_value; /* maximum possible (s32)value */
|
|
u32 u32_min_value; /* minimum possible (u32)value */
|
|
u32 u32_max_value; /* maximum possible (u32)value */
|
|
/* For PTR_TO_PACKET, used to find other pointers with the same variable
|
|
* offset, so they can share range knowledge.
|
|
* For PTR_TO_MAP_VALUE_OR_NULL this is used to share which map value we
|
|
* came from, when one is tested for != NULL.
|
|
* For PTR_TO_MEM_OR_NULL this is used to identify memory allocation
|
|
* for the purpose of tracking that it's freed.
|
|
* For PTR_TO_SOCKET this is used to share which pointers retain the
|
|
* same reference to the socket, to determine proper reference freeing.
|
|
* For stack slots that are dynptrs, this is used to track references to
|
|
* the dynptr to determine proper reference freeing.
|
|
* Similarly to dynptrs, we use ID to track "belonging" of a reference
|
|
* to a specific instance of bpf_iter.
|
|
*/
|
|
u32 id;
|
|
/* PTR_TO_SOCKET and PTR_TO_TCP_SOCK could be a ptr returned
|
|
* from a pointer-cast helper, bpf_sk_fullsock() and
|
|
* bpf_tcp_sock().
|
|
*
|
|
* Consider the following where "sk" is a reference counted
|
|
* pointer returned from "sk = bpf_sk_lookup_tcp();":
|
|
*
|
|
* 1: sk = bpf_sk_lookup_tcp();
|
|
* 2: if (!sk) { return 0; }
|
|
* 3: fullsock = bpf_sk_fullsock(sk);
|
|
* 4: if (!fullsock) { bpf_sk_release(sk); return 0; }
|
|
* 5: tp = bpf_tcp_sock(fullsock);
|
|
* 6: if (!tp) { bpf_sk_release(sk); return 0; }
|
|
* 7: bpf_sk_release(sk);
|
|
* 8: snd_cwnd = tp->snd_cwnd; // verifier will complain
|
|
*
|
|
* After bpf_sk_release(sk) at line 7, both "fullsock" ptr and
|
|
* "tp" ptr should be invalidated also. In order to do that,
|
|
* the reg holding "fullsock" and "sk" need to remember
|
|
* the original refcounted ptr id (i.e. sk_reg->id) in ref_obj_id
|
|
* such that the verifier can reset all regs which have
|
|
* ref_obj_id matching the sk_reg->id.
|
|
*
|
|
* sk_reg->ref_obj_id is set to sk_reg->id at line 1.
|
|
* sk_reg->id will stay as NULL-marking purpose only.
|
|
* After NULL-marking is done, sk_reg->id can be reset to 0.
|
|
*
|
|
* After "fullsock = bpf_sk_fullsock(sk);" at line 3,
|
|
* fullsock_reg->ref_obj_id is set to sk_reg->ref_obj_id.
|
|
*
|
|
* After "tp = bpf_tcp_sock(fullsock);" at line 5,
|
|
* tp_reg->ref_obj_id is set to fullsock_reg->ref_obj_id
|
|
* which is the same as sk_reg->ref_obj_id.
|
|
*
|
|
* From the verifier perspective, if sk, fullsock and tp
|
|
* are not NULL, they are the same ptr with different
|
|
* reg->type. In particular, bpf_sk_release(tp) is also
|
|
* allowed and has the same effect as bpf_sk_release(sk).
|
|
*/
|
|
u32 ref_obj_id;
|
|
/* parentage chain for liveness checking */
|
|
struct bpf_reg_state *parent;
|
|
/* Inside the callee two registers can be both PTR_TO_STACK like
|
|
* R1=fp-8 and R2=fp-8, but one of them points to this function stack
|
|
* while another to the caller's stack. To differentiate them 'frameno'
|
|
* is used which is an index in bpf_verifier_state->frame[] array
|
|
* pointing to bpf_func_state.
|
|
*/
|
|
u32 frameno;
|
|
/* Tracks subreg definition. The stored value is the insn_idx of the
|
|
* writing insn. This is safe because subreg_def is used before any insn
|
|
* patching which only happens after main verification finished.
|
|
*/
|
|
s32 subreg_def;
|
|
enum bpf_reg_liveness live;
|
|
/* if (!precise && SCALAR_VALUE) min/max/tnum don't affect safety */
|
|
bool precise;
|
|
};
|
|
|
|
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_ZERO, /* BPF program wrote constant zero */
|
|
/* A dynptr is stored in this stack slot. The type of dynptr
|
|
* is stored in bpf_stack_state->spilled_ptr.dynptr.type
|
|
*/
|
|
STACK_DYNPTR,
|
|
STACK_ITER,
|
|
};
|
|
|
|
#define BPF_REG_SIZE 8 /* size of eBPF register in bytes */
|
|
|
|
#define BPF_REGMASK_ARGS ((1 << BPF_REG_1) | (1 << BPF_REG_2) | \
|
|
(1 << BPF_REG_3) | (1 << BPF_REG_4) | \
|
|
(1 << BPF_REG_5))
|
|
|
|
#define BPF_DYNPTR_SIZE sizeof(struct bpf_dynptr_kern)
|
|
#define BPF_DYNPTR_NR_SLOTS (BPF_DYNPTR_SIZE / BPF_REG_SIZE)
|
|
|
|
struct bpf_stack_state {
|
|
struct bpf_reg_state spilled_ptr;
|
|
u8 slot_type[BPF_REG_SIZE];
|
|
};
|
|
|
|
struct bpf_reference_state {
|
|
/* Track each reference created with a unique id, even if the same
|
|
* instruction creates the reference multiple times (eg, via CALL).
|
|
*/
|
|
int id;
|
|
/* Instruction where the allocation of this reference occurred. This
|
|
* is used purely to inform the user of a reference leak.
|
|
*/
|
|
int insn_idx;
|
|
/* There can be a case like:
|
|
* main (frame 0)
|
|
* cb (frame 1)
|
|
* func (frame 3)
|
|
* cb (frame 4)
|
|
* Hence for frame 4, if callback_ref just stored boolean, it would be
|
|
* impossible to distinguish nested callback refs. Hence store the
|
|
* frameno and compare that to callback_ref in check_reference_leak when
|
|
* exiting a callback function.
|
|
*/
|
|
int callback_ref;
|
|
};
|
|
|
|
/* state of the program:
|
|
* type of all registers and stack info
|
|
*/
|
|
struct bpf_func_state {
|
|
struct bpf_reg_state regs[MAX_BPF_REG];
|
|
/* index of call instruction that called into this func */
|
|
int callsite;
|
|
/* stack frame number of this function state from pov of
|
|
* enclosing bpf_verifier_state.
|
|
* 0 = main function, 1 = first callee.
|
|
*/
|
|
u32 frameno;
|
|
/* subprog number == index within subprog_info
|
|
* zero == main subprog
|
|
*/
|
|
u32 subprogno;
|
|
/* Every bpf_timer_start will increment async_entry_cnt.
|
|
* It's used to distinguish:
|
|
* void foo(void) { for(;;); }
|
|
* void foo(void) { bpf_timer_set_callback(,foo); }
|
|
*/
|
|
u32 async_entry_cnt;
|
|
bool in_callback_fn;
|
|
struct tnum callback_ret_range;
|
|
bool in_async_callback_fn;
|
|
|
|
/* The following fields should be last. See copy_func_state() */
|
|
int acquired_refs;
|
|
struct bpf_reference_state *refs;
|
|
int allocated_stack;
|
|
struct bpf_stack_state *stack;
|
|
};
|
|
|
|
struct bpf_idx_pair {
|
|
u32 prev_idx;
|
|
u32 idx;
|
|
};
|
|
|
|
#define MAX_CALL_FRAMES 8
|
|
/* Maximum number of register states that can exist at once */
|
|
#define BPF_ID_MAP_SIZE ((MAX_BPF_REG + MAX_BPF_STACK / BPF_REG_SIZE) * MAX_CALL_FRAMES)
|
|
struct bpf_verifier_state {
|
|
/* call stack tracking */
|
|
struct bpf_func_state *frame[MAX_CALL_FRAMES];
|
|
struct bpf_verifier_state *parent;
|
|
/*
|
|
* 'branches' field is the number of branches left to explore:
|
|
* 0 - all possible paths from this state reached bpf_exit or
|
|
* were safely pruned
|
|
* 1 - at least one path is being explored.
|
|
* This state hasn't reached bpf_exit
|
|
* 2 - at least two paths are being explored.
|
|
* This state is an immediate parent of two children.
|
|
* One is fallthrough branch with branches==1 and another
|
|
* state is pushed into stack (to be explored later) also with
|
|
* branches==1. The parent of this state has branches==1.
|
|
* The verifier state tree connected via 'parent' pointer looks like:
|
|
* 1
|
|
* 1
|
|
* 2 -> 1 (first 'if' pushed into stack)
|
|
* 1
|
|
* 2 -> 1 (second 'if' pushed into stack)
|
|
* 1
|
|
* 1
|
|
* 1 bpf_exit.
|
|
*
|
|
* Once do_check() reaches bpf_exit, it calls update_branch_counts()
|
|
* and the verifier state tree will look:
|
|
* 1
|
|
* 1
|
|
* 2 -> 1 (first 'if' pushed into stack)
|
|
* 1
|
|
* 1 -> 1 (second 'if' pushed into stack)
|
|
* 0
|
|
* 0
|
|
* 0 bpf_exit.
|
|
* After pop_stack() the do_check() will resume at second 'if'.
|
|
*
|
|
* If is_state_visited() sees a state with branches > 0 it means
|
|
* there is a loop. If such state is exactly equal to the current state
|
|
* it's an infinite loop. Note states_equal() checks for states
|
|
* equivalency, so two states being 'states_equal' does not mean
|
|
* infinite loop. The exact comparison is provided by
|
|
* states_maybe_looping() function. It's a stronger pre-check and
|
|
* much faster than states_equal().
|
|
*
|
|
* This algorithm may not find all possible infinite loops or
|
|
* loop iteration count may be too high.
|
|
* In such cases BPF_COMPLEXITY_LIMIT_INSNS limit kicks in.
|
|
*/
|
|
u32 branches;
|
|
u32 insn_idx;
|
|
u32 curframe;
|
|
|
|
struct bpf_active_lock active_lock;
|
|
bool speculative;
|
|
bool active_rcu_lock;
|
|
|
|
/* first and last insn idx of this verifier state */
|
|
u32 first_insn_idx;
|
|
u32 last_insn_idx;
|
|
/* jmp history recorded from first to last.
|
|
* backtracking is using it to go from last to first.
|
|
* For most states jmp_history_cnt is [0-3].
|
|
* For loops can go up to ~40.
|
|
*/
|
|
struct bpf_idx_pair *jmp_history;
|
|
u32 jmp_history_cnt;
|
|
};
|
|
|
|
#define bpf_get_spilled_reg(slot, frame) \
|
|
(((slot < frame->allocated_stack / BPF_REG_SIZE) && \
|
|
(frame->stack[slot].slot_type[0] == STACK_SPILL)) \
|
|
? &frame->stack[slot].spilled_ptr : NULL)
|
|
|
|
/* Iterate over 'frame', setting 'reg' to either NULL or a spilled register. */
|
|
#define bpf_for_each_spilled_reg(iter, frame, reg) \
|
|
for (iter = 0, reg = bpf_get_spilled_reg(iter, frame); \
|
|
iter < frame->allocated_stack / BPF_REG_SIZE; \
|
|
iter++, reg = bpf_get_spilled_reg(iter, frame))
|
|
|
|
/* Invoke __expr over regsiters in __vst, setting __state and __reg */
|
|
#define bpf_for_each_reg_in_vstate(__vst, __state, __reg, __expr) \
|
|
({ \
|
|
struct bpf_verifier_state *___vstate = __vst; \
|
|
int ___i, ___j; \
|
|
for (___i = 0; ___i <= ___vstate->curframe; ___i++) { \
|
|
struct bpf_reg_state *___regs; \
|
|
__state = ___vstate->frame[___i]; \
|
|
___regs = __state->regs; \
|
|
for (___j = 0; ___j < MAX_BPF_REG; ___j++) { \
|
|
__reg = &___regs[___j]; \
|
|
(void)(__expr); \
|
|
} \
|
|
bpf_for_each_spilled_reg(___j, __state, __reg) { \
|
|
if (!__reg) \
|
|
continue; \
|
|
(void)(__expr); \
|
|
} \
|
|
} \
|
|
})
|
|
|
|
/* linked list of verifier states used to prune search */
|
|
struct bpf_verifier_state_list {
|
|
struct bpf_verifier_state state;
|
|
struct bpf_verifier_state_list *next;
|
|
int miss_cnt, hit_cnt;
|
|
};
|
|
|
|
struct bpf_loop_inline_state {
|
|
unsigned int initialized:1; /* set to true upon first entry */
|
|
unsigned int fit_for_inline:1; /* true if callback function is the same
|
|
* at each call and flags are always zero
|
|
*/
|
|
u32 callback_subprogno; /* valid when fit_for_inline is true */
|
|
};
|
|
|
|
/* Possible states for alu_state member. */
|
|
#define BPF_ALU_SANITIZE_SRC (1U << 0)
|
|
#define BPF_ALU_SANITIZE_DST (1U << 1)
|
|
#define BPF_ALU_NEG_VALUE (1U << 2)
|
|
#define BPF_ALU_NON_POINTER (1U << 3)
|
|
#define BPF_ALU_IMMEDIATE (1U << 4)
|
|
#define BPF_ALU_SANITIZE (BPF_ALU_SANITIZE_SRC | \
|
|
BPF_ALU_SANITIZE_DST)
|
|
|
|
struct bpf_insn_aux_data {
|
|
union {
|
|
enum bpf_reg_type ptr_type; /* pointer type for load/store insns */
|
|
unsigned long map_ptr_state; /* pointer/poison value for maps */
|
|
s32 call_imm; /* saved imm field of call insn */
|
|
u32 alu_limit; /* limit for add/sub register with pointer */
|
|
struct {
|
|
u32 map_index; /* index into used_maps[] */
|
|
u32 map_off; /* offset from value base address */
|
|
};
|
|
struct {
|
|
enum bpf_reg_type reg_type; /* type of pseudo_btf_id */
|
|
union {
|
|
struct {
|
|
struct btf *btf;
|
|
u32 btf_id; /* btf_id for struct typed var */
|
|
};
|
|
u32 mem_size; /* mem_size for non-struct typed var */
|
|
};
|
|
} btf_var;
|
|
/* if instruction is a call to bpf_loop this field tracks
|
|
* the state of the relevant registers to make decision about inlining
|
|
*/
|
|
struct bpf_loop_inline_state loop_inline_state;
|
|
};
|
|
union {
|
|
/* remember the size of type passed to bpf_obj_new to rewrite R1 */
|
|
u64 obj_new_size;
|
|
/* remember the offset of node field within type to rewrite */
|
|
u64 insert_off;
|
|
};
|
|
struct btf_struct_meta *kptr_struct_meta;
|
|
u64 map_key_state; /* constant (32 bit) key tracking for maps */
|
|
int ctx_field_size; /* the ctx field size for load insn, maybe 0 */
|
|
u32 seen; /* this insn was processed by the verifier at env->pass_cnt */
|
|
bool sanitize_stack_spill; /* subject to Spectre v4 sanitation */
|
|
bool zext_dst; /* this insn zero extends dst reg */
|
|
bool storage_get_func_atomic; /* bpf_*_storage_get() with atomic memory alloc */
|
|
bool is_iter_next; /* bpf_iter_<type>_next() kfunc call */
|
|
u8 alu_state; /* used in combination with alu_limit */
|
|
|
|
/* below fields are initialized once */
|
|
unsigned int orig_idx; /* original instruction index */
|
|
bool jmp_point;
|
|
bool prune_point;
|
|
/* ensure we check state equivalence and save state checkpoint and
|
|
* this instruction, regardless of any heuristics
|
|
*/
|
|
bool force_checkpoint;
|
|
};
|
|
|
|
#define MAX_USED_MAPS 64 /* max number of maps accessed by one eBPF program */
|
|
#define MAX_USED_BTFS 64 /* max number of BTFs accessed by one BPF program */
|
|
|
|
#define BPF_VERIFIER_TMP_LOG_SIZE 1024
|
|
|
|
struct bpf_verifier_log {
|
|
/* Logical start and end positions of a "log window" of the verifier log.
|
|
* start_pos == 0 means we haven't truncated anything.
|
|
* Once truncation starts to happen, start_pos + len_total == end_pos,
|
|
* except during log reset situations, in which (end_pos - start_pos)
|
|
* might get smaller than len_total (see bpf_vlog_reset()).
|
|
* Generally, (end_pos - start_pos) gives number of useful data in
|
|
* user log buffer.
|
|
*/
|
|
u64 start_pos;
|
|
u64 end_pos;
|
|
char __user *ubuf;
|
|
u32 level;
|
|
u32 len_total;
|
|
u32 len_max;
|
|
char kbuf[BPF_VERIFIER_TMP_LOG_SIZE];
|
|
};
|
|
|
|
#define BPF_LOG_LEVEL1 1
|
|
#define BPF_LOG_LEVEL2 2
|
|
#define BPF_LOG_STATS 4
|
|
#define BPF_LOG_FIXED 8
|
|
#define BPF_LOG_LEVEL (BPF_LOG_LEVEL1 | BPF_LOG_LEVEL2)
|
|
#define BPF_LOG_MASK (BPF_LOG_LEVEL | BPF_LOG_STATS | BPF_LOG_FIXED)
|
|
#define BPF_LOG_KERNEL (BPF_LOG_MASK + 1) /* kernel internal flag */
|
|
#define BPF_LOG_MIN_ALIGNMENT 8U
|
|
#define BPF_LOG_ALIGNMENT 40U
|
|
|
|
static inline bool bpf_verifier_log_needed(const struct bpf_verifier_log *log)
|
|
{
|
|
return log && log->level;
|
|
}
|
|
|
|
#define BPF_MAX_SUBPROGS 256
|
|
|
|
struct bpf_subprog_info {
|
|
/* 'start' has to be the first field otherwise find_subprog() won't work */
|
|
u32 start; /* insn idx of function entry point */
|
|
u32 linfo_idx; /* The idx to the main_prog->aux->linfo */
|
|
u16 stack_depth; /* max. stack depth used by this function */
|
|
bool has_tail_call;
|
|
bool tail_call_reachable;
|
|
bool has_ld_abs;
|
|
bool is_async_cb;
|
|
};
|
|
|
|
struct bpf_verifier_env;
|
|
|
|
struct backtrack_state {
|
|
struct bpf_verifier_env *env;
|
|
u32 frame;
|
|
u32 reg_masks[MAX_CALL_FRAMES];
|
|
u64 stack_masks[MAX_CALL_FRAMES];
|
|
};
|
|
|
|
struct bpf_id_pair {
|
|
u32 old;
|
|
u32 cur;
|
|
};
|
|
|
|
struct bpf_idmap {
|
|
u32 tmp_id_gen;
|
|
struct bpf_id_pair map[BPF_ID_MAP_SIZE];
|
|
};
|
|
|
|
struct bpf_idset {
|
|
u32 count;
|
|
u32 ids[BPF_ID_MAP_SIZE];
|
|
};
|
|
|
|
/* single container for all structs
|
|
* one verifier_env per bpf_check() call
|
|
*/
|
|
struct bpf_verifier_env {
|
|
u32 insn_idx;
|
|
u32 prev_insn_idx;
|
|
struct bpf_prog *prog; /* eBPF program being verified */
|
|
const struct bpf_verifier_ops *ops;
|
|
struct bpf_verifier_stack_elem *head; /* stack of verifier states to be processed */
|
|
int stack_size; /* number of states to be processed */
|
|
bool strict_alignment; /* perform strict pointer alignment checks */
|
|
bool test_state_freq; /* test verifier with different pruning frequency */
|
|
struct bpf_verifier_state *cur_state; /* current verifier state */
|
|
struct bpf_verifier_state_list **explored_states; /* search pruning optimization */
|
|
struct bpf_verifier_state_list *free_list;
|
|
struct bpf_map *used_maps[MAX_USED_MAPS]; /* array of map's used by eBPF program */
|
|
struct btf_mod_pair used_btfs[MAX_USED_BTFS]; /* array of BTF's used by BPF program */
|
|
u32 used_map_cnt; /* number of used maps */
|
|
u32 used_btf_cnt; /* number of used BTF objects */
|
|
u32 id_gen; /* used to generate unique reg IDs */
|
|
bool explore_alu_limits;
|
|
bool allow_ptr_leaks;
|
|
bool allow_uninit_stack;
|
|
bool bpf_capable;
|
|
bool bypass_spec_v1;
|
|
bool bypass_spec_v4;
|
|
bool seen_direct_write;
|
|
struct bpf_insn_aux_data *insn_aux_data; /* array of per-insn state */
|
|
const struct bpf_line_info *prev_linfo;
|
|
struct bpf_verifier_log log;
|
|
struct bpf_subprog_info subprog_info[BPF_MAX_SUBPROGS + 1];
|
|
union {
|
|
struct bpf_idmap idmap_scratch;
|
|
struct bpf_idset idset_scratch;
|
|
};
|
|
struct {
|
|
int *insn_state;
|
|
int *insn_stack;
|
|
int cur_stack;
|
|
} cfg;
|
|
struct backtrack_state bt;
|
|
u32 pass_cnt; /* number of times do_check() was called */
|
|
u32 subprog_cnt;
|
|
/* number of instructions analyzed by the verifier */
|
|
u32 prev_insn_processed, insn_processed;
|
|
/* number of jmps, calls, exits analyzed so far */
|
|
u32 prev_jmps_processed, jmps_processed;
|
|
/* total verification time */
|
|
u64 verification_time;
|
|
/* maximum number of verifier states kept in 'branching' instructions */
|
|
u32 max_states_per_insn;
|
|
/* total number of allocated verifier states */
|
|
u32 total_states;
|
|
/* some states are freed during program analysis.
|
|
* this is peak number of states. this number dominates kernel
|
|
* memory consumption during verification
|
|
*/
|
|
u32 peak_states;
|
|
/* longest register parentage chain walked for liveness marking */
|
|
u32 longest_mark_read_walk;
|
|
bpfptr_t fd_array;
|
|
|
|
/* bit mask to keep track of whether a register has been accessed
|
|
* since the last time the function state was printed
|
|
*/
|
|
u32 scratched_regs;
|
|
/* Same as scratched_regs but for stack slots */
|
|
u64 scratched_stack_slots;
|
|
u64 prev_log_pos, prev_insn_print_pos;
|
|
/* buffer used to generate temporary string representations,
|
|
* e.g., in reg_type_str() to generate reg_type string
|
|
*/
|
|
char tmp_str_buf[TMP_STR_BUF_LEN];
|
|
};
|
|
|
|
__printf(2, 0) void bpf_verifier_vlog(struct bpf_verifier_log *log,
|
|
const char *fmt, va_list args);
|
|
__printf(2, 3) void bpf_verifier_log_write(struct bpf_verifier_env *env,
|
|
const char *fmt, ...);
|
|
__printf(2, 3) void bpf_log(struct bpf_verifier_log *log,
|
|
const char *fmt, ...);
|
|
int bpf_vlog_init(struct bpf_verifier_log *log, u32 log_level,
|
|
char __user *log_buf, u32 log_size);
|
|
void bpf_vlog_reset(struct bpf_verifier_log *log, u64 new_pos);
|
|
int bpf_vlog_finalize(struct bpf_verifier_log *log, u32 *log_size_actual);
|
|
|
|
static inline struct bpf_func_state *cur_func(struct bpf_verifier_env *env)
|
|
{
|
|
struct bpf_verifier_state *cur = env->cur_state;
|
|
|
|
return cur->frame[cur->curframe];
|
|
}
|
|
|
|
static inline struct bpf_reg_state *cur_regs(struct bpf_verifier_env *env)
|
|
{
|
|
return cur_func(env)->regs;
|
|
}
|
|
|
|
int bpf_prog_offload_verifier_prep(struct bpf_prog *prog);
|
|
int bpf_prog_offload_verify_insn(struct bpf_verifier_env *env,
|
|
int insn_idx, int prev_insn_idx);
|
|
int bpf_prog_offload_finalize(struct bpf_verifier_env *env);
|
|
void
|
|
bpf_prog_offload_replace_insn(struct bpf_verifier_env *env, u32 off,
|
|
struct bpf_insn *insn);
|
|
void
|
|
bpf_prog_offload_remove_insns(struct bpf_verifier_env *env, u32 off, u32 cnt);
|
|
|
|
int check_ptr_off_reg(struct bpf_verifier_env *env,
|
|
const struct bpf_reg_state *reg, int regno);
|
|
int check_func_arg_reg_off(struct bpf_verifier_env *env,
|
|
const struct bpf_reg_state *reg, int regno,
|
|
enum bpf_arg_type arg_type);
|
|
int check_mem_reg(struct bpf_verifier_env *env, struct bpf_reg_state *reg,
|
|
u32 regno, u32 mem_size);
|
|
|
|
/* this lives here instead of in bpf.h because it needs to dereference tgt_prog */
|
|
static inline u64 bpf_trampoline_compute_key(const struct bpf_prog *tgt_prog,
|
|
struct btf *btf, u32 btf_id)
|
|
{
|
|
if (tgt_prog)
|
|
return ((u64)tgt_prog->aux->id << 32) | btf_id;
|
|
else
|
|
return ((u64)btf_obj_id(btf) << 32) | 0x80000000 | btf_id;
|
|
}
|
|
|
|
/* unpack the IDs from the key as constructed above */
|
|
static inline void bpf_trampoline_unpack_key(u64 key, u32 *obj_id, u32 *btf_id)
|
|
{
|
|
if (obj_id)
|
|
*obj_id = key >> 32;
|
|
if (btf_id)
|
|
*btf_id = key & 0x7FFFFFFF;
|
|
}
|
|
|
|
int bpf_check_attach_target(struct bpf_verifier_log *log,
|
|
const struct bpf_prog *prog,
|
|
const struct bpf_prog *tgt_prog,
|
|
u32 btf_id,
|
|
struct bpf_attach_target_info *tgt_info);
|
|
void bpf_free_kfunc_btf_tab(struct bpf_kfunc_btf_tab *tab);
|
|
|
|
int mark_chain_precision(struct bpf_verifier_env *env, int regno);
|
|
|
|
#define BPF_BASE_TYPE_MASK GENMASK(BPF_BASE_TYPE_BITS - 1, 0)
|
|
|
|
/* extract base type from bpf_{arg, return, reg}_type. */
|
|
static inline u32 base_type(u32 type)
|
|
{
|
|
return type & BPF_BASE_TYPE_MASK;
|
|
}
|
|
|
|
/* extract flags from an extended type. See bpf_type_flag in bpf.h. */
|
|
static inline u32 type_flag(u32 type)
|
|
{
|
|
return type & ~BPF_BASE_TYPE_MASK;
|
|
}
|
|
|
|
/* only use after check_attach_btf_id() */
|
|
static inline enum bpf_prog_type resolve_prog_type(const struct bpf_prog *prog)
|
|
{
|
|
return prog->type == BPF_PROG_TYPE_EXT ?
|
|
prog->aux->dst_prog->type : prog->type;
|
|
}
|
|
|
|
static inline bool bpf_prog_check_recur(const struct bpf_prog *prog)
|
|
{
|
|
switch (resolve_prog_type(prog)) {
|
|
case BPF_PROG_TYPE_TRACING:
|
|
return prog->expected_attach_type != BPF_TRACE_ITER;
|
|
case BPF_PROG_TYPE_STRUCT_OPS:
|
|
case BPF_PROG_TYPE_LSM:
|
|
return false;
|
|
default:
|
|
return true;
|
|
}
|
|
}
|
|
|
|
#define BPF_REG_TRUSTED_MODIFIERS (MEM_ALLOC | PTR_TRUSTED)
|
|
|
|
static inline bool bpf_type_has_unsafe_modifiers(u32 type)
|
|
{
|
|
return type_flag(type) & ~BPF_REG_TRUSTED_MODIFIERS;
|
|
}
|
|
|
|
#endif /* _LINUX_BPF_VERIFIER_H */
|