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From: Yonghong Song <yhs@fb.com>
To: <bpf@vger.kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>,
	Andrii Nakryiko <andrii@kernel.org>, <bpf@ietf.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Fangrui Song <maskray@google.com>, <kernel-team@fb.com>
Subject: [PATCH bpf-next v3 06/17] bpf: Fix jit blinding with new sdiv/smov insns
Date: Wed, 19 Jul 2023 17:01:34 -0700	[thread overview]
Message-ID: <20230720000134.105248-1-yhs@fb.com> (raw)
In-Reply-To: <20230720000103.99949-1-yhs@fb.com>

Handle new insns properly in bpf_jit_blind_insn() function.

Signed-off-by: Yonghong Song <yhs@fb.com>
---
 include/linux/filter.h | 14 ++++++++++----
 kernel/bpf/core.c      |  4 ++--
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/include/linux/filter.h b/include/linux/filter.h
index a93242b5516b..f5eabe3fa5e8 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -93,22 +93,28 @@ struct ctl_table_header;
 
 /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
 
-#define BPF_ALU64_REG(OP, DST, SRC)				\
+#define BPF_ALU64_REG_OFF(OP, DST, SRC, OFF)			\
 	((struct bpf_insn) {					\
 		.code  = BPF_ALU64 | BPF_OP(OP) | BPF_X,	\
 		.dst_reg = DST,					\
 		.src_reg = SRC,					\
-		.off   = 0,					\
+		.off   = OFF,					\
 		.imm   = 0 })
 
-#define BPF_ALU32_REG(OP, DST, SRC)				\
+#define BPF_ALU64_REG(OP, DST, SRC)				\
+	BPF_ALU64_REG_OFF(OP, DST, SRC, 0)
+
+#define BPF_ALU32_REG_OFF(OP, DST, SRC, OFF)			\
 	((struct bpf_insn) {					\
 		.code  = BPF_ALU | BPF_OP(OP) | BPF_X,		\
 		.dst_reg = DST,					\
 		.src_reg = SRC,					\
-		.off   = 0,					\
+		.off   = OFF,					\
 		.imm   = 0 })
 
+#define BPF_ALU32_REG(OP, DST, SRC)				\
+	BPF_ALU32_REG_OFF(OP, DST, SRC, 0)
+
 /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
 
 #define BPF_ALU64_IMM(OP, DST, IMM)				\
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 3fe895199f6e..646d2fe537be 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -1272,7 +1272,7 @@ static int bpf_jit_blind_insn(const struct bpf_insn *from,
 	case BPF_ALU | BPF_MOD | BPF_K:
 		*to++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_AX, imm_rnd ^ from->imm);
 		*to++ = BPF_ALU32_IMM(BPF_XOR, BPF_REG_AX, imm_rnd);
-		*to++ = BPF_ALU32_REG(from->code, from->dst_reg, BPF_REG_AX);
+		*to++ = BPF_ALU32_REG_OFF(from->code, from->dst_reg, BPF_REG_AX, from->off);
 		break;
 
 	case BPF_ALU64 | BPF_ADD | BPF_K:
@@ -1286,7 +1286,7 @@ static int bpf_jit_blind_insn(const struct bpf_insn *from,
 	case BPF_ALU64 | BPF_MOD | BPF_K:
 		*to++ = BPF_ALU64_IMM(BPF_MOV, BPF_REG_AX, imm_rnd ^ from->imm);
 		*to++ = BPF_ALU64_IMM(BPF_XOR, BPF_REG_AX, imm_rnd);
-		*to++ = BPF_ALU64_REG(from->code, from->dst_reg, BPF_REG_AX);
+		*to++ = BPF_ALU64_REG_OFF(from->code, from->dst_reg, BPF_REG_AX, from->off);
 		break;
 
 	case BPF_JMP | BPF_JEQ  | BPF_K:
-- 
2.34.1


  parent reply	other threads:[~2023-07-20  0:01 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-07-20  0:01 [PATCH bpf-next v3 00/17] bpf: Support new insns from cpu v4 Yonghong Song
2023-07-20  0:01 ` [PATCH bpf-next v3 01/17] bpf: Support new sign-extension load insns Yonghong Song
2023-07-20 20:33   ` Eduard Zingerman
2023-07-24  4:03     ` [Bpf] " Yonghong Song
2023-07-24  4:03       ` Yonghong Song
2023-07-20  0:01 ` [PATCH bpf-next v3 02/17] bpf: Support new sign-extension mov insns Yonghong Song
2023-07-20  0:01 ` [PATCH bpf-next v3 03/17] bpf: Handle sign-extenstin ctx member accesses Yonghong Song
2023-07-20  0:01 ` [PATCH bpf-next v3 04/17] bpf: Support new unconditional bswap instruction Yonghong Song
2023-07-20  0:01 ` [PATCH bpf-next v3 05/17] bpf: Support new signed div/mod instructions Yonghong Song
2023-07-20  0:01   ` [Bpf] " Yonghong Song
2023-07-20  0:01 ` Yonghong Song [this message]
2023-07-20  0:01 ` [PATCH bpf-next v3 07/17] bpf: Support new 32bit offset jmp instruction Yonghong Song
2023-07-20  0:01 ` [PATCH bpf-next v3 08/17] bpf: Add kernel/bpftool asm support for new instructions Yonghong Song
2023-07-21 14:36   ` Quentin Monnet
2023-07-21 14:36     ` [Bpf] " Quentin Monnet
2023-07-20  0:01 ` [PATCH bpf-next v3 09/17] selftests/bpf: Fix a test_verifier failure Yonghong Song
2023-07-20  0:01 ` [PATCH bpf-next v3 10/17] selftests/bpf: Add a cpuv4 test runner for cpu=v4 testing Yonghong Song
2023-07-20  0:02 ` [PATCH bpf-next v3 11/17] selftests/bpf: Add unit tests for new sign-extension load insns Yonghong Song
2023-07-20  6:31   ` [Bpf] " Yonghong Song
2023-07-20  6:31     ` Yonghong Song
2023-07-20  6:36     ` [Bpf] " Yonghong Song
2023-07-20  6:36       ` Yonghong Song
2023-07-20  0:02 ` [PATCH bpf-next v3 12/17] selftests/bpf: Add unit tests for new sign-extension mov insns Yonghong Song
2023-07-20  0:02 ` [PATCH bpf-next v3 13/17] selftests/bpf: Add unit tests for new bswap insns Yonghong Song
2023-07-20  0:02 ` [PATCH bpf-next v3 14/17] selftests/bpf: Add unit tests for new sdiv/smod insns Yonghong Song
2023-07-20  0:02 ` [PATCH bpf-next v3 15/17] selftests/bpf: Add unit tests for new gotol insn Yonghong Song
2023-07-20  0:02   ` [Bpf] " Yonghong Song
2023-07-20  0:02 ` [PATCH bpf-next v3 16/17] selftests/bpf: Test ldsx with more complex cases Yonghong Song
2023-07-20  0:02 ` [PATCH bpf-next v3 17/17] docs/bpf: Add documentation for new instructions Yonghong Song
2023-07-20 20:35 ` [PATCH bpf-next v3 00/17] bpf: Support new insns from cpu v4 Eduard Zingerman

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