* [PATCH] net/packet: fix 4gb buffer limit due to overflow check
@ 2019-02-09 20:37 Kal Conley
2019-02-10 3:01 ` David Miller
0 siblings, 1 reply; 4+ messages in thread
From: Kal Conley @ 2019-02-09 20:37 UTC (permalink / raw)
To: davem
Cc: kal.conley, Willem de Bruijn, Eric Dumazet, Greg Kroah-Hartman,
Jeff Kirsher, Alexander Duyck, Kirill Tkhai, Vincent Whitchurch,
Li RongQing, Magnus Karlsson, open list:NETWORKING [GENERAL],
open list
When calculating rb->frames_per_block * req->tp_block_nr the result
can overflow. Check it for overflow without limiting the total buffer
size to UINT_MAX.
This change fixes support for packet ring buffers >= UINT_MAX.
---
net/packet/af_packet.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index d0945253f43b..d603a430378e 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -4291,7 +4291,7 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
rb->frames_per_block = req->tp_block_size / req->tp_frame_size;
if (unlikely(rb->frames_per_block == 0))
goto out;
- if (unlikely(req->tp_block_size > UINT_MAX / req->tp_block_nr))
+ if (unlikely(rb->frames_per_block > UINT_MAX / req->tp_block_nr))
goto out;
if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
req->tp_frame_nr))
--
2.20.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] net/packet: fix 4gb buffer limit due to overflow check
2019-02-09 20:37 [PATCH] net/packet: fix 4gb buffer limit due to overflow check Kal Conley
@ 2019-02-10 3:01 ` David Miller
2019-02-10 8:57 ` [PATCH v2] " Kal Conley
0 siblings, 1 reply; 4+ messages in thread
From: David Miller @ 2019-02-10 3:01 UTC (permalink / raw)
To: kal.conley
Cc: willemb, edumazet, gregkh, jeffrey.t.kirsher, alexander.h.duyck,
ktkhai, vincent.whitchurch, lirongqing, magnus.karlsson, netdev,
linux-kernel
From: Kal Conley <kal.conley@dectris.com>
Date: Sat, 9 Feb 2019 21:37:00 +0100
> When calculating rb->frames_per_block * req->tp_block_nr the result
> can overflow. Check it for overflow without limiting the total buffer
> size to UINT_MAX.
>
> This change fixes support for packet ring buffers >= UINT_MAX.
Please resubmit with a proper signoff and also an appropriate Fixes:
tag.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH v2] net/packet: fix 4gb buffer limit due to overflow check
2019-02-10 3:01 ` David Miller
@ 2019-02-10 8:57 ` Kal Conley
2019-02-12 18:38 ` David Miller
0 siblings, 1 reply; 4+ messages in thread
From: Kal Conley @ 2019-02-10 8:57 UTC (permalink / raw)
To: davem
Cc: kal.conley, Willem de Bruijn, Eric Dumazet, Alexander Duyck,
Jeff Kirsher, Kirill Tkhai, Vincent Whitchurch, Li RongQing,
Magnus Karlsson, netdev, linux-kernel
When calculating rb->frames_per_block * req->tp_block_nr the result
can overflow. Check it for overflow without limiting the total buffer
size to UINT_MAX.
This change fixes support for packet ring buffers >= UINT_MAX.
Fixes: 8f8d28e4d6d8 ("net/packet: fix overflow in check for tp_frame_nr")
Signed-off-by: Kal Conley <kal.conley@dectris.com>
---
Changes in v2:
- Add Signed-off-by and Fixes tag
net/packet/af_packet.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 3b1a78906bc0..1cd1d83a4be0 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -4292,7 +4292,7 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
rb->frames_per_block = req->tp_block_size / req->tp_frame_size;
if (unlikely(rb->frames_per_block == 0))
goto out;
- if (unlikely(req->tp_block_size > UINT_MAX / req->tp_block_nr))
+ if (unlikely(rb->frames_per_block > UINT_MAX / req->tp_block_nr))
goto out;
if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
req->tp_frame_nr))
--
2.20.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v2] net/packet: fix 4gb buffer limit due to overflow check
2019-02-10 8:57 ` [PATCH v2] " Kal Conley
@ 2019-02-12 18:38 ` David Miller
0 siblings, 0 replies; 4+ messages in thread
From: David Miller @ 2019-02-12 18:38 UTC (permalink / raw)
To: kal.conley
Cc: willemb, edumazet, alexander.h.duyck, jeffrey.t.kirsher, ktkhai,
vincent.whitchurch, lirongqing, magnus.karlsson, netdev,
linux-kernel
From: Kal Conley <kal.conley@dectris.com>
Date: Sun, 10 Feb 2019 09:57:11 +0100
> When calculating rb->frames_per_block * req->tp_block_nr the result
> can overflow. Check it for overflow without limiting the total buffer
> size to UINT_MAX.
>
> This change fixes support for packet ring buffers >= UINT_MAX.
>
> Fixes: 8f8d28e4d6d8 ("net/packet: fix overflow in check for tp_frame_nr")
> Signed-off-by: Kal Conley <kal.conley@dectris.com>
> ---
> Changes in v2:
> - Add Signed-off-by and Fixes tag
Applied and queued up for -stable, thanks.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2019-02-09 20:37 [PATCH] net/packet: fix 4gb buffer limit due to overflow check Kal Conley
2019-02-10 3:01 ` David Miller
2019-02-10 8:57 ` [PATCH v2] " Kal Conley
2019-02-12 18:38 ` David Miller
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