diff mbox series

[bpf-next,v3,1/6] bpf/verifier: replace calls to mark_reg_unknown.

Message ID 20240424224053.471771-2-cupertino.miranda@oracle.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series bpf/verifier: range computation improvements | expand

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netdev/cc_maintainers warning 10 maintainers not CCed: kpsingh@kernel.org john.fastabend@gmail.com andrii@kernel.org jolsa@kernel.org eddyz87@gmail.com song@kernel.org daniel@iogearbox.net martin.lau@linux.dev haoluo@google.com sdf@google.com
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Commit Message

Cupertino Miranda April 24, 2024, 10:40 p.m. UTC 
In order to further simplify the code in adjust_scalar_min_max_vals all
the calls to mark_reg_unknown are replaced by __mark_reg_unknown.

Signed-off-by: Cupertino Miranda <cupertino.miranda@oracle.com>
Cc: Yonghong Song <yonghong.song@linux.dev>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: David Faust <david.faust@oracle.com>
Cc: Jose Marchesi <jose.marchesi@oracle.com>
Cc: Elena Zannoni <elena.zannoni@oracle.com>
---
 kernel/bpf/verifier.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

Comments

Eduard Zingerman April 25, 2024, 4:56 p.m. UTC | #1 
On Wed, 2024-04-24 at 23:40 +0100, Cupertino Miranda wrote:
> In order to further simplify the code in adjust_scalar_min_max_vals all
> the calls to mark_reg_unknown are replaced by __mark_reg_unknown.
> 
> Signed-off-by: Cupertino Miranda <cupertino.miranda@oracle.com>
> Cc: Yonghong Song <yonghong.song@linux.dev>
> Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>
> Cc: David Faust <david.faust@oracle.com>
> Cc: Jose Marchesi <jose.marchesi@oracle.com>
> Cc: Elena Zannoni <elena.zannoni@oracle.com>
> ---

Acked-by: Eduard Zingerman <eddyz87@gmail.com>

Nit: if there would be a v4 for this series (hopefully won't),
     please extend the commit message with something like below:
     
  static void mark_reg_unknown(struct bpf_verifier_env *env,
  			     struct bpf_reg_state *regs, u32 regno)
  {
  	if (WARN_ON(regno >= MAX_BPF_REG)) {
  		... mark all regs not init ...
  		return;
      }
  	__mark_reg_unknown(env, regs + regno);
  }
  
  The 'regno >= MAX_BPF_REG' does not apply to adjust_scalar_min_max_vals(),
  because it is only called from the following stack:
  - check_alu_op
    - adjust_reg_min_max_vals
      - adjust_scalar_min_max_vals
  
  The check_alu_op() does check_reg_arg() which verifies that both src
  and dst register numbers are within bounds.

[...]
diff mbox series

Patch

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 5a7e34e83a5b..6fe641c8ae33 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -13704,7 +13704,6 @@  static int adjust_scalar_min_max_vals(struct bpf_verifier_env *env,
 				      struct bpf_reg_state *dst_reg,
 				      struct bpf_reg_state src_reg)
 {
-	struct bpf_reg_state *regs = cur_regs(env);
 	u8 opcode = BPF_OP(insn->code);
 	bool src_known;
 	s64 smin_val, smax_val;
@@ -13811,7 +13810,7 @@  static int adjust_scalar_min_max_vals(struct bpf_verifier_env *env,
 			/* Shifts greater than 31 or 63 are undefined.
 			 * This includes shifts by a negative number.
 			 */
-			mark_reg_unknown(env, regs, insn->dst_reg);
+			__mark_reg_unknown(env, dst_reg);
 			break;
 		}
 		if (alu32)
@@ -13824,7 +13823,7 @@  static int adjust_scalar_min_max_vals(struct bpf_verifier_env *env,
 			/* Shifts greater than 31 or 63 are undefined.
 			 * This includes shifts by a negative number.
 			 */
-			mark_reg_unknown(env, regs, insn->dst_reg);
+			__mark_reg_unknown(env, dst_reg);
 			break;
 		}
 		if (alu32)
@@ -13837,7 +13836,7 @@  static int adjust_scalar_min_max_vals(struct bpf_verifier_env *env,
 			/* Shifts greater than 31 or 63 are undefined.
 			 * This includes shifts by a negative number.
 			 */
-			mark_reg_unknown(env, regs, insn->dst_reg);
+			__mark_reg_unknown(env, dst_reg);
 			break;
 		}
 		if (alu32)
@@ -13846,7 +13845,7 @@  static int adjust_scalar_min_max_vals(struct bpf_verifier_env *env,
 			scalar_min_max_arsh(dst_reg, &src_reg);
 		break;
 	default:
-		mark_reg_unknown(env, regs, insn->dst_reg);
+		__mark_reg_unknown(env, dst_reg);
 		break;
 	}