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Groups > linux.kernel > #1353698
| From | Kamal Mostafa <kamal@canonical.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3.19.y-ckt 014/196] PCI/AER: Flush workqueue on device remove to avoid use-after-free |
| Date | 2016-03-09 02:20 +0100 |
| Message-ID | <raAXa-Er-63@gated-at.bofh.it> (permalink) |
| References | <raAkq-ai-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
3.19.8-ckt16 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
commit 4ae2182b1e3407de369f8c5d799543b7db74221b upstream.
A Root Port's AER structure (rpc) contains a queue of events. aer_irq()
enqueues AER status information and schedules aer_isr() to dequeue and
process it. When we remove a device, aer_remove() waits for the queue to
be empty, then frees the rpc struct.
But aer_isr() references the rpc struct after dequeueing and possibly
emptying the queue, which can cause a use-after-free error as in the
following scenario with two threads, aer_isr() on the left and a
concurrent aer_remove() on the right:
Thread A Thread B
-------- --------
aer_irq():
rpc->prod_idx++
aer_remove():
wait_event(rpc->prod_idx == rpc->cons_idx)
# now blocked until queue becomes empty
aer_isr(): # ...
rpc->cons_idx++ # unblocked because queue is now empty
... kfree(rpc)
mutex_unlock(&rpc->rpc_mutex)
To prevent this problem, use flush_work() to wait until the last scheduled
instance of aer_isr() has completed before freeing the rpc struct in
aer_remove().
I reproduced this use-after-free by flashing a device FPGA and
re-enumerating the bus to find the new device. With SLUB debug, this
crashes with 0x6b bytes (POISON_FREE, the use-after-free magic number) in
GPR25:
pcieport 0000:00:00.0: AER: Multiple Corrected error received: id=0000
Unable to handle kernel paging request for data at address 0x27ef9e3e
Workqueue: events aer_isr
GPR24: dd6aa000 6b6b6b6b 605f8378 605f8360 d99b12c0 604fc674 606b1704 d99b12c0
NIP [602f5328] pci_walk_bus+0xd4/0x104
[bhelgaas: changelog, stable tag]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
drivers/pci/pcie/aer/aerdrv.c | 4 +---
drivers/pci/pcie/aer/aerdrv.h | 1 -
drivers/pci/pcie/aer/aerdrv_core.c | 2 --
3 files changed, 1 insertion(+), 6 deletions(-)
diff --git a/drivers/pci/pcie/aer/aerdrv.c b/drivers/pci/pcie/aer/aerdrv.c
index 0bf82a2..48d21e0 100644
--- a/drivers/pci/pcie/aer/aerdrv.c
+++ b/drivers/pci/pcie/aer/aerdrv.c
@@ -262,7 +262,6 @@ static struct aer_rpc *aer_alloc_rpc(struct pcie_device *dev)
rpc->rpd = dev;
INIT_WORK(&rpc->dpc_handler, aer_isr);
mutex_init(&rpc->rpc_mutex);
- init_waitqueue_head(&rpc->wait_release);
/* Use PCIe bus function to store rpc into PCIe device */
set_service_data(dev, rpc);
@@ -285,8 +284,7 @@ static void aer_remove(struct pcie_device *dev)
if (rpc->isr)
free_irq(dev->irq, dev);
- wait_event(rpc->wait_release, rpc->prod_idx == rpc->cons_idx);
-
+ flush_work(&rpc->dpc_handler);
aer_disable_rootport(rpc);
kfree(rpc);
set_service_data(dev, NULL);
diff --git a/drivers/pci/pcie/aer/aerdrv.h b/drivers/pci/pcie/aer/aerdrv.h
index 84420b7..945c939 100644
--- a/drivers/pci/pcie/aer/aerdrv.h
+++ b/drivers/pci/pcie/aer/aerdrv.h
@@ -72,7 +72,6 @@ struct aer_rpc {
* recovery on the same
* root port hierarchy
*/
- wait_queue_head_t wait_release;
};
struct aer_broadcast_data {
diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c
index 5653ea9..b60a325 100644
--- a/drivers/pci/pcie/aer/aerdrv_core.c
+++ b/drivers/pci/pcie/aer/aerdrv_core.c
@@ -784,8 +784,6 @@ void aer_isr(struct work_struct *work)
while (get_e_source(rpc, &e_src))
aer_isr_one_error(p_device, &e_src);
mutex_unlock(&rpc->rpc_mutex);
-
- wake_up(&rpc->wait_release);
}
/**
--
2.7.0
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[PATCH 3.19.y-ckt 108/196] xen/pciback: Check PF instead of VF for PCI_COMMAND_MEMORY Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:00 +0100
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[PATCH 3.19.y-ckt 139/196] libceph: don't bail early from try_read() when skipping a message Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:00 +0100
[PATCH 3.19.y-ckt 135/196] sunrpc/cache: fix off-by-one in qword_get() Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:00 +0100
[PATCH 3.19.y-ckt 084/196] ARM: 8517/1: ICST: avoid arithmetic overflow in icst_hz() Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 062/196] drm/dp/mst: deallocate payload on port destruction Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 101/196] btrfs: properly set the termination value of ctx->pos in readdir Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
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[PATCH 3.19.y-ckt 094/196] ahci: Intel DNV device IDs SATA Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
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[PATCH 3.19.y-ckt 095/196] workqueue: handle NUMA_NO_NODE for unbound pool_workqueue lookup Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
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[PATCH 3.19.y-ckt 063/196] ALSA: hda - Fix static checker warning in patch_hdmi.c Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 088/196] ALSA: timer: Fix race at concurrent reads Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 089/196] phy: core: Fixup return value of phy_exit when !pm_runtime_enabled Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
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[PATCH 3.19.y-ckt 098/196] s390/dasd: prevent incorrect length error under z/VM after PAV changes Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
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[PATCH 3.19.y-ckt 097/196] cifs: fix erroneous return value Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 080/196] drm/i915/dsi: defend gpio table against out of bounds access Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 093/196] drm/i915: fix error path in intel_setup_gmbus() Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 085/196] xen/scsiback: correct frontend counting Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 091/196] phy: twl4030-usb: Relase usb phy on unload Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 078/196] klist: fix starting point removed bug in klist iterators Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 065/196] dump_stack: avoid potential deadlocks Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 081/196] drm/i915/dsi: don't pass arbitrary data to sideband Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 075/196] pty: fix possible use after free of tty->driver_data Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 070/196] crypto: user - lock crypto_alg_list on alg dump Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 082/196] powerpc: Fix dedotify for binutils >= 2.26 Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 079/196] ALSA: dummy: Implement timer backend switching more safely Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 056/196] scsi_dh_rdac: always retry MODE SELECT on command lock violation Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 086/196] nfs: fix nfs_size_to_loff_t Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 073/196] serial: omap: Prevent DoS using unprivileged ioctl(TIOCSRS485) Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 083/196] ALSA: timer: Fix wrong instance passed to slave callbacks Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 067/196] ocfs2/dlm: clear refmap bit of recovery lock while doing local recovery cleanup Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:10 +0100
[PATCH 3.19.y-ckt 045/196] drivers/scsi/sg.c: mark VMA as VM_IO to prevent migration Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 058/196] drm: fix missing reference counting decrease Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 047/196] Revert "xhci: don't finish a TD if we get a short-transfer event mid TD" Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 060/196] drm/dp/mst: Calculate MST PBN with 31.32 fixed point Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 033/196] ALSA: timer: Fix link corruption due to double start or stop Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 027/196] intel_scu_ipcutil: underflow in scu_reg_access() Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 039/196] ASoC: dpcm: fix the BE state on hw_free Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 028/196] ALSA: seq: Fix race at closing in virmidi driver Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 037/196] drm: add helper to check for wc memory support Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 015/196] libata: disable forced PORTS_IMPL for >= AHCI 1.3 Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 046/196] radix-tree: fix race in gang lookup Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 051/196] [media] tda1004x: only update the frontend properties if locked Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 049/196] xhci: Fix list corruption in urb dequeue at host removal Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 057/196] SCSI: Add Marvell Console to VPD blacklist Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 029/196] ALSA: rawmidi: Remove kernel WARNING for NULL user-space buffer check Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 040/196] module: wrapper for symbol name. Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 041/196] ALSA: hda - Add fixup for Mac Mini 7,1 model Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 059/196] drm: Add drm_fixp_from_fraction and drm_fixp2int_ceil Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 034/196] libata: fix sff host state machine locking while polling Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 025/196] iio: inkern: fix a NULL dereference on error Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 008/196] x86/entry/compat: Add missing CLAC to entry_INT80_32 Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 043/196] ALSA: rawmidi: Fix race at copying & updating the position Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 042/196] ALSA: rawmidi: Make snd_rawmidi_transmit() race-free Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 031/196] ALSA: seq: Fix yet another races among ALSA timer accesses Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 030/196] ALSA: pcm: Fix potential deadlock in OSS emulation Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 044/196] ALSA: seq: Fix lockdep warnings due to double mutex locks Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 035/196] MIPS: Fix buffer overflow in syscall_get_arguments() Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 036/196] cputime: Prevent 32bit overflow in time[val|spec]_to_cputime() Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 024/196] crypto: algif_hash - wait for crypto_ahash_init() to complete Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 014/196] PCI/AER: Flush workqueue on device remove to avoid use-after-free Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 023/196] target: Fix WRITE_SAME/DISCARD conversion to linux 512b sectors Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 013/196] cgroup: make sure a parent css isn't offlined before its children Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 026/196] iio: pressure: mpl115: fix temperature offset sign Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 038/196] drm/radeon: mask out WC from BO on unsupported arches Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 032/196] ALSA: timer: Code cleanup Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:20 +0100
[PATCH 3.19.y-ckt 005/196] EVM: Use crypto_memneq() for digest comparisons Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:30 +0100
[PATCH 3.19.y-ckt 007/196] drm/vmwgfx: Fix an fb unlocking bug Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:30 +0100
[PATCH 3.19.y-ckt 004/196] iw_cxgb3: Fix incorrectly returning error on success Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:30 +0100
[PATCH 3.19.y-ckt 010/196] iio: dac: mcp4725: set iio name property in sysfs Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:30 +0100
[PATCH 3.19.y-ckt 006/196] ALSA: usb-audio: avoid freeing umidi object twice Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:30 +0100
[PATCH 3.19.y-ckt 011/196] iommu/vt-d: Fix 64-bit accesses to 32-bit DMAR_GSTS_REG Kamal Mostafa <kamal@canonical.com> - 2016-03-09 02:30 +0100
csiph-web