* [PATCH net-next] devlink: refactor end checks in devlink_nl_cmd_region_read_dumpit
@ 2020-05-13 17:28 Jakub Kicinski
2020-05-13 20:56 ` Jacob Keller
2020-05-15 0:36 ` David Miller
0 siblings, 2 replies; 4+ messages in thread
From: Jakub Kicinski @ 2020-05-13 17:28 UTC (permalink / raw)
To: davem; +Cc: jiri, jacob.e.keller, netdev, kernel-team, Jakub Kicinski
Clean up after recent fixes, move address calculations
around and change the variable init, so that we can have
just one start_offset == end_offset check.
Make the check a little stricter to preserve the -EINVAL
error if requested start offset is larger than the region
itself.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
net/core/devlink.c | 41 ++++++++-----------
.../drivers/net/netdevsim/devlink.sh | 15 +++++++
2 files changed, 31 insertions(+), 25 deletions(-)
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 20f935fa29f5..7b76e5fffc10 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -4215,7 +4215,6 @@ static int devlink_nl_region_read_snapshot_fill(struct sk_buff *skb,
struct nlattr **attrs,
u64 start_offset,
u64 end_offset,
- bool dump,
u64 *new_offset)
{
struct devlink_snapshot *snapshot;
@@ -4230,9 +4229,6 @@ static int devlink_nl_region_read_snapshot_fill(struct sk_buff *skb,
if (!snapshot)
return -EINVAL;
- if (end_offset > region->size || dump)
- end_offset = region->size;
-
while (curr_offset < end_offset) {
u32 data_size;
u8 *data;
@@ -4260,13 +4256,12 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
struct netlink_callback *cb)
{
const struct genl_dumpit_info *info = genl_dumpit_info(cb);
- u64 ret_offset, start_offset, end_offset = 0;
+ u64 ret_offset, start_offset, end_offset = U64_MAX;
struct nlattr **attrs = info->attrs;
struct devlink_region *region;
struct nlattr *chunks_attr;
const char *region_name;
struct devlink *devlink;
- bool dump = true;
void *hdr;
int err;
@@ -4294,8 +4289,21 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
goto out_unlock;
}
+ if (attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR] &&
+ attrs[DEVLINK_ATTR_REGION_CHUNK_LEN]) {
+ if (!start_offset)
+ start_offset =
+ nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR]);
+
+ end_offset = nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR]);
+ end_offset += nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_LEN]);
+ }
+
+ if (end_offset > region->size)
+ end_offset = region->size;
+
/* return 0 if there is no further data to read */
- if (start_offset >= region->size) {
+ if (start_offset == end_offset) {
err = 0;
goto out_unlock;
}
@@ -4322,27 +4330,10 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
goto nla_put_failure;
}
- if (attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR] &&
- attrs[DEVLINK_ATTR_REGION_CHUNK_LEN]) {
- if (!start_offset)
- start_offset =
- nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR]);
-
- end_offset = nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR]);
- end_offset += nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_LEN]);
- dump = false;
-
- if (start_offset == end_offset) {
- err = 0;
- goto nla_put_failure;
- }
- }
-
err = devlink_nl_region_read_snapshot_fill(skb, devlink,
region, attrs,
start_offset,
- end_offset, dump,
- &ret_offset);
+ end_offset, &ret_offset);
if (err && err != -EMSGSIZE)
goto nla_put_failure;
diff --git a/tools/testing/selftests/drivers/net/netdevsim/devlink.sh b/tools/testing/selftests/drivers/net/netdevsim/devlink.sh
index ad539eccddcb..de4b32fc4223 100755
--- a/tools/testing/selftests/drivers/net/netdevsim/devlink.sh
+++ b/tools/testing/selftests/drivers/net/netdevsim/devlink.sh
@@ -146,6 +146,21 @@ regions_test()
check_region_snapshot_count dummy post-first-request 3
+ devlink region dump $DL_HANDLE/dummy snapshot 25 >> /dev/null
+ check_err $? "Failed to dump snapshot with id 25"
+
+ devlink region read $DL_HANDLE/dummy snapshot 25 addr 0 len 1 >> /dev/null
+ check_err $? "Failed to read snapshot with id 25 (1 byte)"
+
+ devlink region read $DL_HANDLE/dummy snapshot 25 addr 128 len 128 >> /dev/null
+ check_err $? "Failed to read snapshot with id 25 (128 bytes)"
+
+ devlink region read $DL_HANDLE/dummy snapshot 25 addr 128 len $((1<<32)) >> /dev/null
+ check_err $? "Failed to read snapshot with id 25 (oversized)"
+
+ devlink region read $DL_HANDLE/dummy snapshot 25 addr $((1<<32)) len 128 >> /dev/null 2>&1
+ check_fail $? "Bad read of snapshot with id 25 did not fail"
+
devlink region del $DL_HANDLE/dummy snapshot 25
check_err $? "Failed to delete snapshot with id 25"
--
2.25.4
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH net-next] devlink: refactor end checks in devlink_nl_cmd_region_read_dumpit
2020-05-13 17:28 [PATCH net-next] devlink: refactor end checks in devlink_nl_cmd_region_read_dumpit Jakub Kicinski
@ 2020-05-13 20:56 ` Jacob Keller
2020-05-13 21:19 ` Jakub Kicinski
2020-05-15 0:36 ` David Miller
1 sibling, 1 reply; 4+ messages in thread
From: Jacob Keller @ 2020-05-13 20:56 UTC (permalink / raw)
To: Jakub Kicinski, davem; +Cc: jiri, netdev, kernel-team
On 5/13/2020 10:28 AM, Jakub Kicinski wrote:
> Clean up after recent fixes, move address calculations
> around and change the variable init, so that we can have
> just one start_offset == end_offset check.
>
> Make the check a little stricter to preserve the -EINVAL
> error if requested start offset is larger than the region
> itself.
>
> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
> ---
> net/core/devlink.c | 41 ++++++++-----------
> .../drivers/net/netdevsim/devlink.sh | 15 +++++++
> 2 files changed, 31 insertions(+), 25 deletions(-)
>
> diff --git a/net/core/devlink.c b/net/core/devlink.c
> index 20f935fa29f5..7b76e5fffc10 100644
> --- a/net/core/devlink.c
> +++ b/net/core/devlink.c
> @@ -4215,7 +4215,6 @@ static int devlink_nl_region_read_snapshot_fill(struct sk_buff *skb,
> struct nlattr **attrs,
> u64 start_offset,
> u64 end_offset,
> - bool dump,
> u64 *new_offset)
> {
> struct devlink_snapshot *snapshot;
> @@ -4230,9 +4229,6 @@ static int devlink_nl_region_read_snapshot_fill(struct sk_buff *skb,
> if (!snapshot)
> return -EINVAL;
>
> - if (end_offset > region->size || dump)
> - end_offset = region->size;
> -
Yea I saw this back when I was looking at enabling region dump without a
snapshot. At this point, it doesn't seem necessary, because the snapshot
time is relatively low, and the changes to make snapshot id a bit easier
to use in scripts (i.e. dynamic generation and saving) mean that it
isn't that useful.
Good to see this cleaned up!
> while (curr_offset < end_offset) {
> u32 data_size;
> u8 *data;
> @@ -4260,13 +4256,12 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
> struct netlink_callback *cb)
> {
> const struct genl_dumpit_info *info = genl_dumpit_info(cb);
> - u64 ret_offset, start_offset, end_offset = 0;
> + u64 ret_offset, start_offset, end_offset = U64_MAX;
> struct nlattr **attrs = info->attrs;
> struct devlink_region *region;
> struct nlattr *chunks_attr;
> const char *region_name;
> struct devlink *devlink;
> - bool dump = true;
> void *hdr;
> int err;
>
> @@ -4294,8 +4289,21 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
> goto out_unlock;
> }
>
> + if (attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR] &&
> + attrs[DEVLINK_ATTR_REGION_CHUNK_LEN]) {
> + if (!start_offset)
> + start_offset =
> + nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR]);
> +
> + end_offset = nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR]);
At first, reading this confused me a bit, but it makes sense. The end
is always "beginning + length".
If the start_offset is set before, this simply means that we needed to
read over multiple buffers. Ok.
> + end_offset += nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_LEN]);
> + }
> +
> + if (end_offset > region->size)
> + end_offset = region->size;
> +
> /* return 0 if there is no further data to read */
> - if (start_offset >= region->size) {
> + if (start_offset == end_offset) {
Why change this to ==? isn't it possible to specify a start_offset that
is out of bounds? I think this should still be >=
> err = 0;
> goto out_unlock;
> }
> @@ -4322,27 +4330,10 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
> goto nla_put_failure;
> }
>
> - if (attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR] &&
> - attrs[DEVLINK_ATTR_REGION_CHUNK_LEN]) {
> - if (!start_offset)
> - start_offset =
> - nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR]);
> -
> - end_offset = nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR]);
> - end_offset += nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_LEN]);
> - dump = false;
> -
> - if (start_offset == end_offset) {
> - err = 0;
> - goto nla_put_failure;
> - }
> - }
> -
> err = devlink_nl_region_read_snapshot_fill(skb, devlink,
> region, attrs,
> start_offset,
> - end_offset, dump,
> - &ret_offset);
> + end_offset, &ret_offset);
>
> if (err && err != -EMSGSIZE)
> goto nla_put_failure;
> diff --git a/tools/testing/selftests/drivers/net/netdevsim/devlink.sh b/tools/testing/selftests/drivers/net/netdevsim/devlink.sh
> index ad539eccddcb..de4b32fc4223 100755
> --- a/tools/testing/selftests/drivers/net/netdevsim/devlink.sh
> +++ b/tools/testing/selftests/drivers/net/netdevsim/devlink.sh
> @@ -146,6 +146,21 @@ regions_test()
>
> check_region_snapshot_count dummy post-first-request 3
>
> + devlink region dump $DL_HANDLE/dummy snapshot 25 >> /dev/null
> + check_err $? "Failed to dump snapshot with id 25"
> +
> + devlink region read $DL_HANDLE/dummy snapshot 25 addr 0 len 1 >> /dev/null
> + check_err $? "Failed to read snapshot with id 25 (1 byte)"
> +
> + devlink region read $DL_HANDLE/dummy snapshot 25 addr 128 len 128 >> /dev/null
> + check_err $? "Failed to read snapshot with id 25 (128 bytes)"
> +
> + devlink region read $DL_HANDLE/dummy snapshot 25 addr 128 len $((1<<32)) >> /dev/null
> + check_err $? "Failed to read snapshot with id 25 (oversized)"
> +
> + devlink region read $DL_HANDLE/dummy snapshot 25 addr $((1<<32)) len 128 >> /dev/null 2>&1
> + check_fail $? "Bad read of snapshot with id 25 did not fail"
> +
> devlink region del $DL_HANDLE/dummy snapshot 25
> check_err $? "Failed to delete snapshot with id 25"
>
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH net-next] devlink: refactor end checks in devlink_nl_cmd_region_read_dumpit
2020-05-13 20:56 ` Jacob Keller
@ 2020-05-13 21:19 ` Jakub Kicinski
0 siblings, 0 replies; 4+ messages in thread
From: Jakub Kicinski @ 2020-05-13 21:19 UTC (permalink / raw)
To: Jacob Keller; +Cc: davem, jiri, netdev, kernel-team
On Wed, 13 May 2020 13:56:40 -0700 Jacob Keller wrote:
> > @@ -4294,8 +4289,21 @@ static int devlink_nl_cmd_region_read_dumpit(struct sk_buff *skb,
> > goto out_unlock;
> > }
> >
> > + if (attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR] &&
> > + attrs[DEVLINK_ATTR_REGION_CHUNK_LEN]) {
> > + if (!start_offset)
> > + start_offset =
> > + nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR]);
> > +
> > + end_offset = nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_ADDR]);
>
> At first, reading this confused me a bit, but it makes sense. The end
> is always "beginning + length".
>
> If the start_offset is set before, this simply means that we needed to
> read over multiple buffers. Ok.
Yup, I just moved this from below, didn't seem bad enough to rewrite.
> > + end_offset += nla_get_u64(attrs[DEVLINK_ATTR_REGION_CHUNK_LEN]);
> > + }
> > +
> > + if (end_offset > region->size)
> > + end_offset = region->size;
> > +
> > /* return 0 if there is no further data to read */
> > - if (start_offset >= region->size) {
> > + if (start_offset == end_offset) {
>
> Why change this to ==? isn't it possible to specify a start_offset that
> is out of bounds? I think this should still be >=
See 5 lines above :) I moved the capping of end_offset from
devlink_nl_region_read_snapshot_fill() to here. We can keep
it greater equal, but that reads a little defensive.
> > err = 0;
> > goto out_unlock;
> > }
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH net-next] devlink: refactor end checks in devlink_nl_cmd_region_read_dumpit
2020-05-13 17:28 [PATCH net-next] devlink: refactor end checks in devlink_nl_cmd_region_read_dumpit Jakub Kicinski
2020-05-13 20:56 ` Jacob Keller
@ 2020-05-15 0:36 ` David Miller
1 sibling, 0 replies; 4+ messages in thread
From: David Miller @ 2020-05-15 0:36 UTC (permalink / raw)
To: kuba; +Cc: jiri, jacob.e.keller, netdev, kernel-team
From: Jakub Kicinski <kuba@kernel.org>
Date: Wed, 13 May 2020 10:28:22 -0700
> Clean up after recent fixes, move address calculations
> around and change the variable init, so that we can have
> just one start_offset == end_offset check.
>
> Make the check a little stricter to preserve the -EINVAL
> error if requested start offset is larger than the region
> itself.
>
> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Applied, thanks.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2020-05-13 17:28 [PATCH net-next] devlink: refactor end checks in devlink_nl_cmd_region_read_dumpit Jakub Kicinski
2020-05-13 20:56 ` Jacob Keller
2020-05-13 21:19 ` Jakub Kicinski
2020-05-15 0:36 ` David Miller
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