From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Ilya Leoshkevich <iii@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Daniel Borkmann <daniel@iogearbox.net>,
Sasha Levin <sashal@kernel.org>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
linux-s390@vger.kernel.org
Subject: [PATCH AUTOSEL 4.14 02/36] s390/bpf: fix lcgr instruction encoding
Date: Wed, 4 Sep 2019 12:00:48 -0400 [thread overview]
Message-ID: <20190904160122.4179-2-sashal@kernel.org> (raw)
In-Reply-To: <20190904160122.4179-1-sashal@kernel.org>
From: Ilya Leoshkevich <iii@linux.ibm.com>
[ Upstream commit bb2d267c448f4bc3a3389d97c56391cb779178ae ]
"masking, test in bounds 3" fails on s390, because
BPF_ALU64_IMM(BPF_NEG, BPF_REG_2, 0) ignores the top 32 bits of
BPF_REG_2. The reason is that JIT emits lcgfr instead of lcgr.
The associated comment indicates that the code was intended to
emit lcgr in the first place, it's just that the wrong opcode
was used.
Fix by using the correct opcode.
Fixes: 054623105728 ("s390/bpf: Add s390x eBPF JIT compiler backend")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/s390/net/bpf_jit_comp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index bc9431aace05d..fcb9e840727cd 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -882,7 +882,7 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, int i
break;
case BPF_ALU64 | BPF_NEG: /* dst = -dst */
/* lcgr %dst,%dst */
- EMIT4(0xb9130000, dst_reg, dst_reg);
+ EMIT4(0xb9030000, dst_reg, dst_reg);
break;
/*
* BPF_FROM_BE/LE
--
2.20.1
next parent reply other threads:[~2019-09-04 16:08 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190904160122.4179-1-sashal@kernel.org>
2019-09-04 16:00 ` Sasha Levin [this message]
2019-09-04 16:00 ` [PATCH AUTOSEL 4.14 05/36] s390/bpf: use 32-bit index for tail calls Sasha Levin
2019-09-04 16:00 ` [PATCH AUTOSEL 4.14 06/36] batman-adv: fix uninit-value in batadv_netlink_get_ifindex() Sasha Levin
2019-09-04 16:00 ` [PATCH AUTOSEL 4.14 08/36] netfilter: xt_nfacct: Fix alignment mismatch in xt_nfacct_match_info Sasha Levin
2019-09-04 16:00 ` [PATCH AUTOSEL 4.14 12/36] Kconfig: Fix the reference to the IDT77105 Phy driver in the description of ATM_NICSTAR_USE_IDT77105 Sasha Levin
2019-09-04 16:00 ` [PATCH AUTOSEL 4.14 13/36] qed: Add cleanup in qed_slowpath_start() Sasha Levin
2019-09-04 16:01 ` [PATCH AUTOSEL 4.14 15/36] batman-adv: Only read OGM tvlv_len after buffer len check Sasha Levin
2019-09-04 16:01 ` [PATCH AUTOSEL 4.14 16/36] batman-adv: Only read OGM2 " Sasha Levin
2019-09-04 16:01 ` [PATCH AUTOSEL 4.14 17/36] r8152: Set memory to all 0xFFs on failed reg reads Sasha Levin
2019-09-04 16:01 ` [PATCH AUTOSEL 4.14 19/36] netfilter: nf_conntrack_ftp: Fix debug output Sasha Levin
2019-09-04 16:01 ` [PATCH AUTOSEL 4.14 27/36] sky2: Disable MSI on yet another ASUS boards (P6Xxxx) Sasha Levin
2019-09-04 16:01 ` [PATCH AUTOSEL 4.14 31/36] amd-xgbe: Fix error path in xgbe_mod_init() Sasha Levin
2019-09-04 16:01 ` [PATCH AUTOSEL 4.14 32/36] net: stmmac: dwmac-rk: Don't fail if phy regulator is absent Sasha Levin
2019-09-04 16:01 ` [PATCH AUTOSEL 4.14 36/36] net: seeq: Fix the function used to release some memory in an error handling path Sasha Levin
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