* [PATCH AUTOSEL 4.4 11/60] vfio/pci: fix memory leaks in alloc_perm_bits()
[not found] <20200618013004.610532-1-sashal@kernel.org>
@ 2020-06-18 1:29 ` Sasha Levin
2020-06-18 1:29 ` [PATCH AUTOSEL 4.4 40/60] vfio-pci: Mask cap zero Sasha Levin
2020-06-18 1:29 ` [PATCH AUTOSEL 4.4 50/60] vfio/pci: fix memory leaks of eventfd ctx Sasha Levin
2 siblings, 0 replies; 4+ messages in thread
From: Sasha Levin @ 2020-06-18 1:29 UTC (permalink / raw)
To: linux-kernel, stable; +Cc: Qian Cai, Alex Williamson, Sasha Levin, kvm
From: Qian Cai <cai@lca.pw>
[ Upstream commit 3e63b94b6274324ff2e7d8615df31586de827c4e ]
vfio_pci_disable() calls vfio_config_free() but forgets to call
free_perm_bits() resulting in memory leaks,
unreferenced object 0xc000000c4db2dee0 (size 16):
comm "qemu-kvm", pid 4305, jiffies 4295020272 (age 3463.780s)
hex dump (first 16 bytes):
00 00 ff 00 ff ff ff ff ff ff ff ff ff ff 00 00 ................
backtrace:
[<00000000a6a4552d>] alloc_perm_bits+0x58/0xe0 [vfio_pci]
[<00000000ac990549>] vfio_config_init+0xdf0/0x11b0 [vfio_pci]
init_pci_cap_msi_perm at drivers/vfio/pci/vfio_pci_config.c:1125
(inlined by) vfio_msi_cap_len at drivers/vfio/pci/vfio_pci_config.c:1180
(inlined by) vfio_cap_len at drivers/vfio/pci/vfio_pci_config.c:1241
(inlined by) vfio_cap_init at drivers/vfio/pci/vfio_pci_config.c:1468
(inlined by) vfio_config_init at drivers/vfio/pci/vfio_pci_config.c:1707
[<000000006db873a1>] vfio_pci_open+0x234/0x700 [vfio_pci]
[<00000000630e1906>] vfio_group_fops_unl_ioctl+0x8e0/0xb84 [vfio]
[<000000009e34c54f>] ksys_ioctl+0xd8/0x130
[<000000006577923d>] sys_ioctl+0x28/0x40
[<000000006d7b1cf2>] system_call_exception+0x114/0x1e0
[<0000000008ea7dd5>] system_call_common+0xf0/0x278
unreferenced object 0xc000000c4db2e330 (size 16):
comm "qemu-kvm", pid 4305, jiffies 4295020272 (age 3463.780s)
hex dump (first 16 bytes):
00 ff ff 00 ff ff ff ff ff ff ff ff ff ff 00 00 ................
backtrace:
[<000000004c71914f>] alloc_perm_bits+0x44/0xe0 [vfio_pci]
[<00000000ac990549>] vfio_config_init+0xdf0/0x11b0 [vfio_pci]
[<000000006db873a1>] vfio_pci_open+0x234/0x700 [vfio_pci]
[<00000000630e1906>] vfio_group_fops_unl_ioctl+0x8e0/0xb84 [vfio]
[<000000009e34c54f>] ksys_ioctl+0xd8/0x130
[<000000006577923d>] sys_ioctl+0x28/0x40
[<000000006d7b1cf2>] system_call_exception+0x114/0x1e0
[<0000000008ea7dd5>] system_call_common+0xf0/0x278
Fixes: 89e1f7d4c66d ("vfio: Add PCI device driver")
Signed-off-by: Qian Cai <cai@lca.pw>
[aw: rolled in follow-up patch]
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/vfio/pci/vfio_pci_config.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
index 98a12be76c9c..bf65572f47a8 100644
--- a/drivers/vfio/pci/vfio_pci_config.c
+++ b/drivers/vfio/pci/vfio_pci_config.c
@@ -1644,8 +1644,11 @@ void vfio_config_free(struct vfio_pci_device *vdev)
vdev->vconfig = NULL;
kfree(vdev->pci_config_map);
vdev->pci_config_map = NULL;
- kfree(vdev->msi_perm);
- vdev->msi_perm = NULL;
+ if (vdev->msi_perm) {
+ free_perm_bits(vdev->msi_perm);
+ kfree(vdev->msi_perm);
+ vdev->msi_perm = NULL;
+ }
}
/*
--
2.25.1
^ permalink raw reply related [flat|nested] 4+ messages in thread* [PATCH AUTOSEL 4.4 40/60] vfio-pci: Mask cap zero
[not found] <20200618013004.610532-1-sashal@kernel.org>
2020-06-18 1:29 ` [PATCH AUTOSEL 4.4 11/60] vfio/pci: fix memory leaks in alloc_perm_bits() Sasha Levin
@ 2020-06-18 1:29 ` Sasha Levin
2020-06-18 1:29 ` [PATCH AUTOSEL 4.4 50/60] vfio/pci: fix memory leaks of eventfd ctx Sasha Levin
2 siblings, 0 replies; 4+ messages in thread
From: Sasha Levin @ 2020-06-18 1:29 UTC (permalink / raw)
To: linux-kernel, stable; +Cc: Alex Williamson, Cornelia Huck, Sasha Levin, kvm
From: Alex Williamson <alex.williamson@redhat.com>
[ Upstream commit bc138db1b96264b9c1779cf18d5a3b186aa90066 ]
The PCI Code and ID Assignment Specification changed capability ID 0
from reserved to a NULL capability in the v1.1 revision. The NULL
capability is defined to include only the 16-bit capability header,
ie. only the ID and next pointer. Unfortunately vfio-pci creates a
map of config space, where ID 0 is used to reserve the standard type
0 header. Finding an actual capability with this ID therefore results
in a bogus range marked in that map and conflicts with subsequent
capabilities. As this seems to be a dummy capability anyway and we
already support dropping capabilities, let's hide this one rather than
delving into the potentially subtle dependencies within our map.
Seen on an NVIDIA Tesla T4.
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/vfio/pci/vfio_pci_config.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
index bf65572f47a8..666b234acca0 100644
--- a/drivers/vfio/pci/vfio_pci_config.c
+++ b/drivers/vfio/pci/vfio_pci_config.c
@@ -1405,7 +1405,12 @@ static int vfio_cap_init(struct vfio_pci_device *vdev)
if (ret)
return ret;
- if (cap <= PCI_CAP_ID_MAX) {
+ /*
+ * ID 0 is a NULL capability, conflicting with our fake
+ * PCI_CAP_ID_BASIC. As it has no content, consider it
+ * hidden for now.
+ */
+ if (cap && cap <= PCI_CAP_ID_MAX) {
len = pci_cap_length[cap];
if (len == 0xFF) { /* Variable length */
len = vfio_cap_len(vdev, cap, pos);
--
2.25.1
^ permalink raw reply related [flat|nested] 4+ messages in thread* [PATCH AUTOSEL 4.4 50/60] vfio/pci: fix memory leaks of eventfd ctx
[not found] <20200618013004.610532-1-sashal@kernel.org>
2020-06-18 1:29 ` [PATCH AUTOSEL 4.4 11/60] vfio/pci: fix memory leaks in alloc_perm_bits() Sasha Levin
2020-06-18 1:29 ` [PATCH AUTOSEL 4.4 40/60] vfio-pci: Mask cap zero Sasha Levin
@ 2020-06-18 1:29 ` Sasha Levin
2020-06-18 1:37 ` Alex Williamson
2 siblings, 1 reply; 4+ messages in thread
From: Sasha Levin @ 2020-06-18 1:29 UTC (permalink / raw)
To: linux-kernel, stable; +Cc: Qian Cai, Alex Williamson, Sasha Levin, kvm
From: Qian Cai <cai@lca.pw>
[ Upstream commit 1518ac272e789cae8c555d69951b032a275b7602 ]
Finished a qemu-kvm (-device vfio-pci,host=0001:01:00.0) triggers a few
memory leaks after a while because vfio_pci_set_ctx_trigger_single()
calls eventfd_ctx_fdget() without the matching eventfd_ctx_put() later.
Fix it by calling eventfd_ctx_put() for those memory in
vfio_pci_release() before vfio_device_release().
unreferenced object 0xebff008981cc2b00 (size 128):
comm "qemu-kvm", pid 4043, jiffies 4294994816 (age 9796.310s)
hex dump (first 32 bytes):
01 00 00 00 6b 6b 6b 6b 00 00 00 00 ad 4e ad de ....kkkk.....N..
ff ff ff ff 6b 6b 6b 6b ff ff ff ff ff ff ff ff ....kkkk........
backtrace:
[<00000000917e8f8d>] slab_post_alloc_hook+0x74/0x9c
[<00000000df0f2aa2>] kmem_cache_alloc_trace+0x2b4/0x3d4
[<000000005fcec025>] do_eventfd+0x54/0x1ac
[<0000000082791a69>] __arm64_sys_eventfd2+0x34/0x44
[<00000000b819758c>] do_el0_svc+0x128/0x1dc
[<00000000b244e810>] el0_sync_handler+0xd0/0x268
[<00000000d495ef94>] el0_sync+0x164/0x180
unreferenced object 0x29ff008981cc4180 (size 128):
comm "qemu-kvm", pid 4043, jiffies 4294994818 (age 9796.290s)
hex dump (first 32 bytes):
01 00 00 00 6b 6b 6b 6b 00 00 00 00 ad 4e ad de ....kkkk.....N..
ff ff ff ff 6b 6b 6b 6b ff ff ff ff ff ff ff ff ....kkkk........
backtrace:
[<00000000917e8f8d>] slab_post_alloc_hook+0x74/0x9c
[<00000000df0f2aa2>] kmem_cache_alloc_trace+0x2b4/0x3d4
[<000000005fcec025>] do_eventfd+0x54/0x1ac
[<0000000082791a69>] __arm64_sys_eventfd2+0x34/0x44
[<00000000b819758c>] do_el0_svc+0x128/0x1dc
[<00000000b244e810>] el0_sync_handler+0xd0/0x268
[<00000000d495ef94>] el0_sync+0x164/0x180
Signed-off-by: Qian Cai <cai@lca.pw>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/vfio/pci/vfio_pci.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 7a82735d5308..ab765770e8dd 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -255,6 +255,10 @@ static void vfio_pci_release(void *device_data)
if (!(--vdev->refcnt)) {
vfio_spapr_pci_eeh_release(vdev->pdev);
vfio_pci_disable(vdev);
+ if (vdev->err_trigger)
+ eventfd_ctx_put(vdev->err_trigger);
+ if (vdev->req_trigger)
+ eventfd_ctx_put(vdev->req_trigger);
}
mutex_unlock(&driver_lock);
--
2.25.1
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH AUTOSEL 4.4 50/60] vfio/pci: fix memory leaks of eventfd ctx
2020-06-18 1:29 ` [PATCH AUTOSEL 4.4 50/60] vfio/pci: fix memory leaks of eventfd ctx Sasha Levin
@ 2020-06-18 1:37 ` Alex Williamson
0 siblings, 0 replies; 4+ messages in thread
From: Alex Williamson @ 2020-06-18 1:37 UTC (permalink / raw)
To: Sasha Levin; +Cc: linux-kernel, stable, Qian Cai, kvm
On Wed, 17 Jun 2020 21:29:54 -0400
Sasha Levin <sashal@kernel.org> wrote:
> From: Qian Cai <cai@lca.pw>
>
> [ Upstream commit 1518ac272e789cae8c555d69951b032a275b7602 ]
>
> Finished a qemu-kvm (-device vfio-pci,host=0001:01:00.0) triggers a few
> memory leaks after a while because vfio_pci_set_ctx_trigger_single()
> calls eventfd_ctx_fdget() without the matching eventfd_ctx_put() later.
> Fix it by calling eventfd_ctx_put() for those memory in
> vfio_pci_release() before vfio_device_release().
>
> unreferenced object 0xebff008981cc2b00 (size 128):
> comm "qemu-kvm", pid 4043, jiffies 4294994816 (age 9796.310s)
> hex dump (first 32 bytes):
> 01 00 00 00 6b 6b 6b 6b 00 00 00 00 ad 4e ad de ....kkkk.....N..
> ff ff ff ff 6b 6b 6b 6b ff ff ff ff ff ff ff ff ....kkkk........
> backtrace:
> [<00000000917e8f8d>] slab_post_alloc_hook+0x74/0x9c
> [<00000000df0f2aa2>] kmem_cache_alloc_trace+0x2b4/0x3d4
> [<000000005fcec025>] do_eventfd+0x54/0x1ac
> [<0000000082791a69>] __arm64_sys_eventfd2+0x34/0x44
> [<00000000b819758c>] do_el0_svc+0x128/0x1dc
> [<00000000b244e810>] el0_sync_handler+0xd0/0x268
> [<00000000d495ef94>] el0_sync+0x164/0x180
> unreferenced object 0x29ff008981cc4180 (size 128):
> comm "qemu-kvm", pid 4043, jiffies 4294994818 (age 9796.290s)
> hex dump (first 32 bytes):
> 01 00 00 00 6b 6b 6b 6b 00 00 00 00 ad 4e ad de ....kkkk.....N..
> ff ff ff ff 6b 6b 6b 6b ff ff ff ff ff ff ff ff ....kkkk........
> backtrace:
> [<00000000917e8f8d>] slab_post_alloc_hook+0x74/0x9c
> [<00000000df0f2aa2>] kmem_cache_alloc_trace+0x2b4/0x3d4
> [<000000005fcec025>] do_eventfd+0x54/0x1ac
> [<0000000082791a69>] __arm64_sys_eventfd2+0x34/0x44
> [<00000000b819758c>] do_el0_svc+0x128/0x1dc
> [<00000000b244e810>] el0_sync_handler+0xd0/0x268
> [<00000000d495ef94>] el0_sync+0x164/0x180
>
> Signed-off-by: Qian Cai <cai@lca.pw>
> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
> drivers/vfio/pci/vfio_pci.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
> index 7a82735d5308..ab765770e8dd 100644
> --- a/drivers/vfio/pci/vfio_pci.c
> +++ b/drivers/vfio/pci/vfio_pci.c
> @@ -255,6 +255,10 @@ static void vfio_pci_release(void *device_data)
> if (!(--vdev->refcnt)) {
> vfio_spapr_pci_eeh_release(vdev->pdev);
> vfio_pci_disable(vdev);
> + if (vdev->err_trigger)
> + eventfd_ctx_put(vdev->err_trigger);
> + if (vdev->req_trigger)
> + eventfd_ctx_put(vdev->req_trigger);
> }
>
> mutex_unlock(&driver_lock);
This has a fix pending, I'd suggest not picking it on its own:
https://lore.kernel.org/kvm/20200616085052.sahrunsesjyjeyf2@beryllium.lan/
https://lore.kernel.org/kvm/159234276956.31057.6902954364435481688.stgit@gimli.home/
Thanks,
Alex
^ permalink raw reply [flat|nested] 4+ messages in thread