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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>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Fangrui Song <maskray@google.com>, <kernel-team@fb.com>
Subject: [PATCH bpf-next v2 06/15] bpf: Fix jit blinding with new sdiv/smov insns
Date: Wed, 12 Jul 2023 23:07:49 -0700	[thread overview]
Message-ID: <20230713060749.391061-1-yhs@fb.com> (raw)
In-Reply-To: <20230713060718.388258-1-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 f69114083ec7..7a0144d66dfb 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -90,22 +90,28 @@ 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 6f7134657935..c75391ac575e 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:[~2023-07-13  6:08 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-07-13  6:07 [PATCH bpf-next v2 00/15] bpf: Support new insns from cpu v4 Yonghong Song
2023-07-13  6:07 ` [PATCH bpf-next v2 01/15] bpf: Support new sign-extension load insns Yonghong Song
2023-07-14 18:13   ` Alexei Starovoitov
2023-07-14 23:22     ` Yonghong Song
2023-07-17  1:39   ` Eduard Zingerman
2023-07-19  0:15   ` Eduard Zingerman
2023-07-19  2:28     ` Yonghong Song
2023-07-13  6:07 ` [PATCH bpf-next v2 02/15] bpf: Fix sign-extension ctx member accesses Yonghong Song
2023-07-17  1:40   ` Eduard Zingerman
2023-07-19  0:40     ` Yonghong Song
2023-07-13  6:07 ` [PATCH bpf-next v2 03/15] bpf: Support new sign-extension mov insns Yonghong Song
2023-07-17  1:41   ` Eduard Zingerman
2023-07-19  1:17     ` Yonghong Song
2023-07-19 12:53       ` Eduard Zingerman
2023-07-19 15:59         ` Fangrui Song
2023-07-19 16:57           ` Eduard Zingerman
2023-07-13  6:07 ` [PATCH bpf-next v2 04/15] bpf: Support new unconditional bswap instruction Yonghong Song
2023-07-17  1:42   ` Eduard Zingerman
2023-07-19  1:22     ` Yonghong Song
2023-07-13  6:07 ` [PATCH bpf-next v2 05/15] bpf: Support new signed div/mod instructions Yonghong Song
2023-07-18 23:00   ` Eduard Zingerman
2023-07-19  2:30     ` Yonghong Song
2023-07-19  2:44       ` Alexei Starovoitov
2023-07-19  6:57         ` Yonghong Song
2023-07-13  6:07 ` Yonghong Song [this message]
2023-07-13  6:07 ` [PATCH bpf-next v2 07/15] bpf: Support new 32bit offset jmp instruction Yonghong Song
2023-07-13  6:08 ` [PATCH bpf-next v2 08/15] selftests/bpf: Add a cpuv4 test runner for cpu=v4 testing Yonghong Song
2023-07-13  6:18   ` Fangrui Song
2023-07-13  6:25     ` Yonghong Song
2023-07-13  6:08 ` [PATCH bpf-next v2 09/15] selftests/bpf: Add unit tests for new sign-extension load insns Yonghong Song
2023-07-18 23:06   ` Eduard Zingerman
2023-07-13  6:08 ` [PATCH bpf-next v2 10/15] selftests/bpf: Add unit tests for new sign-extension mov insns Yonghong Song
2023-07-13  6:08 ` [PATCH bpf-next v2 11/15] selftests/bpf: Add unit tests for new bswap insns Yonghong Song
2023-07-13  6:08 ` [PATCH bpf-next v2 12/15] selftests/bpf: Add unit tests for new sdiv/smod insns Yonghong Song
2023-07-18 23:10   ` Eduard Zingerman
2023-07-13  6:08 ` [PATCH bpf-next v2 13/15] selftests/bpf: Add unit tests for new gotol insn Yonghong Song
2023-07-13  6:08 ` [PATCH bpf-next v2 14/15] selftests/bpf: Test ldsx with more complex cases Yonghong Song
2023-07-13  6:08 ` [PATCH bpf-next v2 15/15] docs/bpf: Add documentation for new instructions Yonghong Song
2023-07-14 18:28   ` Alexei Starovoitov
2023-07-14 23:26     ` Yonghong Song
2023-07-14 23:33   ` Dave Thaler
2023-07-14 23:33     ` [Bpf] " Dave Thaler
2023-07-15  0:23     ` Alexei Starovoitov
2023-07-15  0:23       ` [Bpf] " Alexei Starovoitov
2023-07-14 23:34   ` Dave Thaler
2023-07-14 23:34     ` [Bpf] " Dave Thaler
2023-07-17  1:39 ` [PATCH bpf-next v2 00/15] bpf: Support new insns from cpu v4 Eduard Zingerman
2023-07-17 16:56   ` Alexei Starovoitov
2023-07-17 17:04     ` Eduard Zingerman
2023-07-17 21:52   ` Yonghong Song
2023-07-21 14:56     ` Jose E. Marchesi
2023-07-24  0:17       ` Jose E. Marchesi
2023-07-24  1:04         ` Jose E. Marchesi
2023-07-24  2:35           ` Yonghong Song

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