This is a note to let you know that I've just added the patch titled
s390/bpf: fix recache skb->data/hlen for skb_vlan_push/pop
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
s390-bpf-fix-recache-skb-data-hlen-for-skb_vlan_push-pop.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6edf0aa4f8bbdfbb4d6d786892fa02728d05dc36 Mon Sep 17 00:00:00 2001
From: Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
Date: Wed, 11 May 2016 21:13:13 +0200
Subject: s390/bpf: fix recache skb->data/hlen for skb_vlan_push/pop
From: Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
commit 6edf0aa4f8bbdfbb4d6d786892fa02728d05dc36 upstream.
In case of usage of skb_vlan_push/pop, in the prologue we store
the SKB pointer on the stack and restore it after BPF_JMP_CALL
to skb_vlan_push/pop.
Unfortunately currently there are two bugs in the code:
1) The wrong stack slot (offset 170 instead of 176) is used
2) The wrong register (W1 instead of B1) is saved
So fix this and use correct stack slot and register.
Fixes: 9db7f2b81880 ("s390/bpf: recache skb->data/hlen for skb_vlan_push/pop")
Signed-off-by: Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/s390/net/bpf_jit.h | 4 ++--
arch/s390/net/bpf_jit_comp.c | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
--- a/arch/s390/net/bpf_jit.h
+++ b/arch/s390/net/bpf_jit.h
@@ -37,7 +37,7 @@ extern u8 sk_load_word[], sk_load_half[]
* | | |
* +---------------+ |
* | 8 byte skbp | |
- * R15+170 -> +---------------+ |
+ * R15+176 -> +---------------+ |
* | 8 byte hlen | |
* R15+168 -> +---------------+ |
* | 4 byte align | |
@@ -58,7 +58,7 @@ extern u8 sk_load_word[], sk_load_half[]
#define STK_OFF (STK_SPACE - STK_160_UNUSED)
#define STK_OFF_TMP 160 /* Offset of tmp buffer on stack */
#define STK_OFF_HLEN 168 /* Offset of SKB header length on stack */
-#define STK_OFF_SKBP 170 /* Offset of SKB pointer on stack */
+#define STK_OFF_SKBP 176 /* Offset of SKB pointer on stack */
#define STK_OFF_R6 (160 - 11 * 8) /* Offset of r6 on stack */
#define STK_OFF_TCCNT (160 - 12 * 8) /* Offset of tail_call_cnt on stack */
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -446,7 +446,7 @@ static void bpf_jit_prologue(struct bpf_
emit_load_skb_data_hlen(jit);
if (jit->seen & SEEN_SKB_CHANGE)
/* stg %b1,ST_OFF_SKBP(%r0,%r15) */
- EMIT6_DISP_LH(0xe3000000, 0x0024, REG_W1, REG_0, REG_15,
+ EMIT6_DISP_LH(0xe3000000, 0x0024, BPF_REG_1, REG_0, REG_15,
STK_OFF_SKBP);
/* Clear A (%b0) and X (%b7) registers for converted BPF programs */
if (is_classic) {
Patches currently in stable-queue which might be from holzheu@xxxxxxxxxxxxxxxxxx are
queue-4.4/s390-bpf-fix-recache-skb-data-hlen-for-skb_vlan_push-pop.patch
queue-4.4/s390-bpf-reduce-maximum-program-size-to-64-kb.patch
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