This is required to catch the errors later and fall back to a nospec if
on a speculative path.
Move code into do_check_insn(), replace
* "continue" with "return INSN_IDX_MODIFIED"
* "goto process_bpf_exit" with "return PROCESS_BPF_EXIT"
* "do_print_state = " with "*do_print_state = "
Signed-off-by: Luis Gerhorst <luis.gerho...@fau.de>
Acked-by: Henriette Herzog <henriette.her...@rub.de>
Cc: Maximilian Ott <o...@cs.fau.de>
Cc: Milan Stephan <milan.step...@fau.de>
---
kernel/bpf/verifier.c | 426 ++++++++++++++++++++++--------------------
1 file changed, 224 insertions(+), 202 deletions(-)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 3303a3605ee8..199a6341ac82 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -19213,6 +19213,209 @@ static int save_aux_ptr_type(struct bpf_verifier_env
*env, enum bpf_reg_type typ
return 0;
}
+enum {
+ PROCESS_BPF_EXIT = 1,
+ INSN_IDX_MODIFIED
+};
+
+static int do_check_insn(struct bpf_verifier_env *env, struct bpf_insn *insn,
+ bool pop_log, bool *do_print_state,
+ struct bpf_reg_state *regs,
+ struct bpf_verifier_state *state, int *prev_insn_idx)
+{
+ int err;
+ u8 class = BPF_CLASS(insn->code);
+ bool exception_exit = false;
+
+ if (class == BPF_ALU || class == BPF_ALU64) {
+ err = check_alu_op(env, insn);
+ if (err)
+ return err;
+
+ } else if (class == BPF_LDX) {
+ bool is_ldsx = BPF_MODE(insn->code) == BPF_MEMSX;
+
+ /* Check for reserved fields is already done in
+ * resolve_pseudo_ldimm64().
+ */
+ err = check_load_mem(env, insn, false, is_ldsx, true, "ldx");
+ if (err)
+ return err;
+ } else if (class == BPF_STX) {
+ if (BPF_MODE(insn->code) == BPF_ATOMIC) {
+ err = check_atomic(env, insn);
+ if (err)
+ return err;
+ env->insn_idx++;
+ return INSN_IDX_MODIFIED;
+ }
+
+ if (BPF_MODE(insn->code) != BPF_MEM || insn->imm != 0) {
+ verbose(env, "BPF_STX uses reserved fields\n");
+ return -EINVAL;
+ }
+
+ err = check_store_reg(env, insn, false);
+ if (err)
+ return err;
+ } else if (class == BPF_ST) {
+ enum bpf_reg_type dst_reg_type;
+
+ if (BPF_MODE(insn->code) != BPF_MEM ||
+ insn->src_reg != BPF_REG_0) {
+ verbose(env, "BPF_ST uses reserved fields\n");
+ return -EINVAL;
+ }
+ /* check src operand */
+ err = check_reg_arg(env, insn->dst_reg, SRC_OP);
+ if (err)
+ return err;
+
+ dst_reg_type = regs[insn->dst_reg].type;
+
+ /* check that memory (dst_reg + off) is writeable */
+ err = check_mem_access(env, env->insn_idx, insn->dst_reg,
+ insn->off, BPF_SIZE(insn->code),
+ BPF_WRITE, -1, false, false);
+ if (err)
+ return err;
+
+ err = save_aux_ptr_type(env, dst_reg_type, false);
+ if (err)
+ return err;
+ } else if (class == BPF_JMP || class == BPF_JMP32) {
+ u8 opcode = BPF_OP(insn->code);
+
+ env->jmps_processed++;
+ if (opcode == BPF_CALL) {
+ if (BPF_SRC(insn->code) != BPF_K ||
+ (insn->src_reg != BPF_PSEUDO_KFUNC_CALL &&
+ insn->off != 0) ||
+ (insn->src_reg != BPF_REG_0 &&
+ insn->src_reg != BPF_PSEUDO_CALL &&
+ insn->src_reg != BPF_PSEUDO_KFUNC_CALL) ||
+ insn->dst_reg != BPF_REG_0 || class == BPF_JMP32) {
+ verbose(env, "BPF_CALL uses reserved fields\n");
+ return -EINVAL;
+ }
+
+ if (env->cur_state->active_locks) {
+ if ((insn->src_reg == BPF_REG_0 && insn->imm !=
BPF_FUNC_spin_unlock) ||
+ (insn->src_reg == BPF_PSEUDO_KFUNC_CALL &&
+ (insn->off != 0 ||
!kfunc_spin_allowed(insn->imm)))) {
+ verbose(env,
+ "function calls are not allowed
while holding a lock\n");
+ return -EINVAL;
+ }
+ }
+ if (insn->src_reg == BPF_PSEUDO_CALL) {
+ err = check_func_call(env, insn,
&env->insn_idx);
+ } else if (insn->src_reg == BPF_PSEUDO_KFUNC_CALL) {
+ err = check_kfunc_call(env, insn,
&env->insn_idx);
+ if (!err && is_bpf_throw_kfunc(insn)) {
+ exception_exit = true;
+ goto process_bpf_exit_full;
+ }
+ } else {
+ err = check_helper_call(env, insn,
&env->insn_idx);
+ }
+ if (err)
+ return err;
+
+ mark_reg_scratched(env, BPF_REG_0);
+ } else if (opcode == BPF_JA) {
+ if (BPF_SRC(insn->code) != BPF_K ||
+ insn->src_reg != BPF_REG_0 ||
+ insn->dst_reg != BPF_REG_0 ||
+ (class == BPF_JMP && insn->imm != 0) ||
+ (class == BPF_JMP32 && insn->off != 0)) {
+ verbose(env, "BPF_JA uses reserved fields\n");
+ return -EINVAL;
+ }
+
+ if (class == BPF_JMP)
+ env->insn_idx += insn->off + 1;
+ else
+ env->insn_idx += insn->imm + 1;
+ return INSN_IDX_MODIFIED;
+ } else if (opcode == BPF_EXIT) {
+ if (BPF_SRC(insn->code) != BPF_K ||
+ insn->imm != 0 ||
+ insn->src_reg != BPF_REG_0 ||
+ insn->dst_reg != BPF_REG_0 ||
+ class == BPF_JMP32) {
+ verbose(env, "BPF_EXIT uses reserved fields\n");
+ return -EINVAL;
+ }
+process_bpf_exit_full:
+ /* We must do check_reference_leak here before
+ * prepare_func_exit to handle the case when
+ * state->curframe > 0, it may be a callback function,
+ * for which reference_state must match caller reference
+ * state when it exits.
+ */
+ err = check_resource_leak(env, exception_exit,
!env->cur_state->curframe,
+ "BPF_EXIT instruction in main
prog");
+ if (err)
+ return err;
+
+ /* The side effect of the prepare_func_exit which is
+ * being skipped is that it frees bpf_func_state.
+ * Typically, process_bpf_exit will only be hit with
+ * outermost exit. copy_verifier_state in pop_stack will
+ * handle freeing of any extra bpf_func_state left over
+ * from not processing all nested function exits. We
+ * also skip return code checks as they are not needed
+ * for exceptional exits.
+ */
+ if (exception_exit)
+ return PROCESS_BPF_EXIT;
+
+ if (state->curframe) {
+ /* exit from nested function */
+ err = prepare_func_exit(env, &env->insn_idx);
+ if (err)
+ return err;
+ *do_print_state = true;
+ return INSN_IDX_MODIFIED;
+ }
+
+ err = check_return_code(env, BPF_REG_0, "R0");
+ if (err)
+ return err;
+ return PROCESS_BPF_EXIT;
+ } else {
+ err = check_cond_jmp_op(env, insn, &env->insn_idx);
+ if (err)
+ return err;
+ }
+ } else if (class == BPF_LD) {
+ u8 mode = BPF_MODE(insn->code);
+
+ if (mode == BPF_ABS || mode == BPF_IND) {
+ err = check_ld_abs(env, insn);
+ if (err)
+ return err;
+
+ } else if (mode == BPF_IMM) {
+ err = check_ld_imm(env, insn);
+ if (err)
+ return err;
+
+ env->insn_idx++;
+ sanitize_mark_insn_seen(env);
+ } else {
+ verbose(env, "invalid BPF_LD mode\n");
+ return -EINVAL;
+ }
+ } else {
+ verbose(env, "unknown insn class %d\n", class);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int do_check(struct bpf_verifier_env *env)
{
bool pop_log = !(env->log.level & BPF_LOG_LEVEL2);
@@ -19224,9 +19427,7 @@ static int do_check(struct bpf_verifier_env *env)
int prev_insn_idx = -1;
for (;;) {
- bool exception_exit = false;
struct bpf_insn *insn;
- u8 class;
int err;
/* reset current history entry on each new instruction */
@@ -19240,7 +19441,6 @@ static int do_check(struct bpf_verifier_env *env)
}
insn = &insns[env->insn_idx];
- class = BPF_CLASS(insn->code);
if (++env->insn_processed > BPF_COMPLEXITY_LIMIT_INSNS) {
verbose(env,
@@ -19314,210 +19514,32 @@ static int do_check(struct bpf_verifier_env *env)
sanitize_mark_insn_seen(env);
prev_insn_idx = env->insn_idx;
- if (class == BPF_ALU || class == BPF_ALU64) {
- err = check_alu_op(env, insn);
- if (err)
- return err;
-
- } else if (class == BPF_LDX) {
- bool is_ldsx = BPF_MODE(insn->code) == BPF_MEMSX;
-
- /* Check for reserved fields is already done in
- * resolve_pseudo_ldimm64().
- */
- err = check_load_mem(env, insn, false, is_ldsx, true,
- "ldx");
- if (err)
- return err;
- } else if (class == BPF_STX) {
- if (BPF_MODE(insn->code) == BPF_ATOMIC) {
- err = check_atomic(env, insn);
- if (err)
- return err;
- env->insn_idx++;
- continue;
- }
-
- if (BPF_MODE(insn->code) != BPF_MEM || insn->imm != 0) {
- verbose(env, "BPF_STX uses reserved fields\n");
- return -EINVAL;
- }
-
- err = check_store_reg(env, insn, false);
- if (err)
- return err;
- } else if (class == BPF_ST) {
- enum bpf_reg_type dst_reg_type;
-
- if (BPF_MODE(insn->code) != BPF_MEM ||
- insn->src_reg != BPF_REG_0) {
- verbose(env, "BPF_ST uses reserved fields\n");
- return -EINVAL;
- }
- /* check src operand */
- err = check_reg_arg(env, insn->dst_reg, SRC_OP);
- if (err)
- return err;
-
- dst_reg_type = regs[insn->dst_reg].type;
-
- /* check that memory (dst_reg + off) is writeable */
- err = check_mem_access(env, env->insn_idx,
insn->dst_reg,
- insn->off, BPF_SIZE(insn->code),
- BPF_WRITE, -1, false, false);
- if (err)
- return err;
-
- err = save_aux_ptr_type(env, dst_reg_type, false);
- if (err)
- return err;
- } else if (class == BPF_JMP || class == BPF_JMP32) {
- u8 opcode = BPF_OP(insn->code);
-
- env->jmps_processed++;
- if (opcode == BPF_CALL) {
- if (BPF_SRC(insn->code) != BPF_K ||
- (insn->src_reg != BPF_PSEUDO_KFUNC_CALL
- && insn->off != 0) ||
- (insn->src_reg != BPF_REG_0 &&
- insn->src_reg != BPF_PSEUDO_CALL &&
- insn->src_reg != BPF_PSEUDO_KFUNC_CALL) ||
- insn->dst_reg != BPF_REG_0 ||
- class == BPF_JMP32) {
- verbose(env, "BPF_CALL uses reserved
fields\n");
- return -EINVAL;
- }
-
- if (env->cur_state->active_locks) {
- if ((insn->src_reg == BPF_REG_0 &&
insn->imm != BPF_FUNC_spin_unlock) ||
- (insn->src_reg ==
BPF_PSEUDO_KFUNC_CALL &&
- (insn->off != 0 ||
!kfunc_spin_allowed(insn->imm)))) {
- verbose(env, "function calls
are not allowed while holding a lock\n");
- return -EINVAL;
- }
- }
- if (insn->src_reg == BPF_PSEUDO_CALL) {
- err = check_func_call(env, insn,
&env->insn_idx);
- } else if (insn->src_reg ==
BPF_PSEUDO_KFUNC_CALL) {
- err = check_kfunc_call(env, insn,
&env->insn_idx);
- if (!err && is_bpf_throw_kfunc(insn)) {
- exception_exit = true;
- goto process_bpf_exit_full;
- }
- } else {
- err = check_helper_call(env, insn,
&env->insn_idx);
- }
- if (err)
- return err;
-
- mark_reg_scratched(env, BPF_REG_0);
- } else if (opcode == BPF_JA) {
- if (BPF_SRC(insn->code) != BPF_K ||
- insn->src_reg != BPF_REG_0 ||
- insn->dst_reg != BPF_REG_0 ||
- (class == BPF_JMP && insn->imm != 0) ||
- (class == BPF_JMP32 && insn->off != 0)) {
- verbose(env, "BPF_JA uses reserved
fields\n");
- return -EINVAL;
- }
-
- if (class == BPF_JMP)
- env->insn_idx += insn->off + 1;
- else
- env->insn_idx += insn->imm + 1;
- continue;
-
- } else if (opcode == BPF_EXIT) {
- if (BPF_SRC(insn->code) != BPF_K ||
- insn->imm != 0 ||
- insn->src_reg != BPF_REG_0 ||
- insn->dst_reg != BPF_REG_0 ||
- class == BPF_JMP32) {
- verbose(env, "BPF_EXIT uses reserved
fields\n");
- return -EINVAL;
- }
-process_bpf_exit_full:
- /* We must do check_reference_leak here before
- * prepare_func_exit to handle the case when
- * state->curframe > 0, it may be a callback
- * function, for which reference_state must
- * match caller reference state when it exits.
- */
- err = check_resource_leak(env, exception_exit,
!env->cur_state->curframe,
- "BPF_EXIT instruction
in main prog");
- if (err)
- return err;
-
- /* The side effect of the prepare_func_exit
- * which is being skipped is that it frees
- * bpf_func_state. Typically, process_bpf_exit
- * will only be hit with outermost exit.
- * copy_verifier_state in pop_stack will handle
- * freeing of any extra bpf_func_state left over
- * from not processing all nested function
- * exits. We also skip return code checks as
- * they are not needed for exceptional exits.
- */
- if (exception_exit)
- goto process_bpf_exit;
-
- if (state->curframe) {
- /* exit from nested function */
- err = prepare_func_exit(env,
&env->insn_idx);
- if (err)
- return err;
- do_print_state = true;
- continue;
- }
-
- err = check_return_code(env, BPF_REG_0, "R0");
- if (err)
- return err;
+ err = do_check_insn(env, insn, pop_log, &do_print_state, regs,
state,
+ &prev_insn_idx);
+ if (err < 0) {
+ return err;
+ } else if (err == INSN_IDX_MODIFIED) {
+ continue;
+ } else if (err == PROCESS_BPF_EXIT) {
process_bpf_exit:
- mark_verifier_state_scratched(env);
- update_branch_counts(env, env->cur_state);
- err = pop_stack(env, &prev_insn_idx,
- &env->insn_idx, pop_log);
- if (err < 0) {
- if (err != -ENOENT)
- return err;
- break;
- } else {
- if
(WARN_ON_ONCE(env->cur_state->loop_entry)) {
- verbose(env, "verifier bug:
env->cur_state->loop_entry != NULL\n");
- return -EFAULT;
- }
- do_print_state = true;
- continue;
- }
- } else {
- err = check_cond_jmp_op(env, insn,
&env->insn_idx);
- if (err)
- return err;
- }
- } else if (class == BPF_LD) {
- u8 mode = BPF_MODE(insn->code);
-
- if (mode == BPF_ABS || mode == BPF_IND) {
- err = check_ld_abs(env, insn);
- if (err)
- return err;
-
- } else if (mode == BPF_IMM) {
- err = check_ld_imm(env, insn);
- if (err)
+ mark_verifier_state_scratched(env);
+ update_branch_counts(env, env->cur_state);
+ err = pop_stack(env, &prev_insn_idx, &env->insn_idx,
+ pop_log);
+ if (err < 0) {
+ if (err != -ENOENT)
return err;
-
- env->insn_idx++;
- sanitize_mark_insn_seen(env);
+ break;
} else {
- verbose(env, "invalid BPF_LD mode\n");
- return -EINVAL;
+ if (WARN_ON_ONCE(env->cur_state->loop_entry)) {
+ verbose(env, "verifier bug:
env->cur_state->loop_entry != NULL\n");
+ return -EFAULT;
+ }
+ do_print_state = true;
+ continue;
}
- } else {
- verbose(env, "unknown insn class %d\n", class);
- return -EINVAL;
}
+ WARN_ON_ONCE(err);
env->insn_idx++;
}
--
2.48.1
