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Groups > linux.kernel > #1312725
| From | Kamal Mostafa <kamal@canonical.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3.19.y-ckt 114/160] xen/pciback: Save xen_pci_op commands before processing it |
| Date | 2016-01-20 02:30 +0100 |
| Message-ID | <qSPKZ-7CF-69@gated-at.bofh.it> (permalink) |
| References | <qSPrA-7sT-9@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
3.19.8-ckt13 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
commit 8135cf8b092723dbfcc611fe6fdcb3a36c9951c5 upstream.
Double fetch vulnerabilities that happen when a variable is
fetched twice from shared memory but a security check is only
performed the first time.
The xen_pcibk_do_op function performs a switch statements on the op->cmd
value which is stored in shared memory. Interestingly this can result
in a double fetch vulnerability depending on the performed compiler
optimization.
This patch fixes it by saving the xen_pci_op command before
processing it. We also use 'barrier' to make sure that the
compiler does not perform any optimization.
This is part of XSA155.
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Jan Beulich <JBeulich@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
drivers/xen/xen-pciback/pciback.h | 1 +
drivers/xen/xen-pciback/pciback_ops.c | 15 ++++++++++++++-
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/xen/xen-pciback/pciback.h b/drivers/xen/xen-pciback/pciback.h
index 58e38d5..4d529f3 100644
--- a/drivers/xen/xen-pciback/pciback.h
+++ b/drivers/xen/xen-pciback/pciback.h
@@ -37,6 +37,7 @@ struct xen_pcibk_device {
struct xen_pci_sharedinfo *sh_info;
unsigned long flags;
struct work_struct op_work;
+ struct xen_pci_op op;
};
struct xen_pcibk_dev_data {
diff --git a/drivers/xen/xen-pciback/pciback_ops.c b/drivers/xen/xen-pciback/pciback_ops.c
index c4a0666..a0e0e3e 100644
--- a/drivers/xen/xen-pciback/pciback_ops.c
+++ b/drivers/xen/xen-pciback/pciback_ops.c
@@ -298,9 +298,11 @@ void xen_pcibk_do_op(struct work_struct *data)
container_of(data, struct xen_pcibk_device, op_work);
struct pci_dev *dev;
struct xen_pcibk_dev_data *dev_data = NULL;
- struct xen_pci_op *op = &pdev->sh_info->op;
+ struct xen_pci_op *op = &pdev->op;
int test_intx = 0;
+ *op = pdev->sh_info->op;
+ barrier();
dev = xen_pcibk_get_pci_dev(pdev, op->domain, op->bus, op->devfn);
if (dev == NULL)
@@ -342,6 +344,17 @@ void xen_pcibk_do_op(struct work_struct *data)
if ((dev_data->enable_intx != test_intx))
xen_pcibk_control_isr(dev, 0 /* no reset */);
}
+ pdev->sh_info->op.err = op->err;
+ pdev->sh_info->op.value = op->value;
+#ifdef CONFIG_PCI_MSI
+ if (op->cmd == XEN_PCI_OP_enable_msix && op->err == 0) {
+ unsigned int i;
+
+ for (i = 0; i < op->value; i++)
+ pdev->sh_info->op.msix_entries[i].vector =
+ op->msix_entries[i].vector;
+ }
+#endif
/* Tell the driver domain that we're done. */
wmb();
clear_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags);
--
1.9.1
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2016-01-20 02:40 +0100 [PATCH 3.19.y-ckt 092/160] tty: Fix GPF in flush_to_ldisc() Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100 [PATCH 3.19.y-ckt 064/160] video: fbdev: fsl: Fix kernel crash when diu_ops is not implemented Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100 [PATCH 3.19.y-ckt 053/160] dmaengine: at_xdmac: fix macro typo Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100 [PATCH 3.19.y-ckt 076/160] ASoC: davinci-mcasp: Fix XDATA check in mcasp_start_tx Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100 [PATCH 3.19.y-ckt 142/160] sctp: start t5 timer only when peer rwnd is 0 and local state is SHUTDOWN_PENDING Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100 [PATCH 3.19.y-ckt 036/160] AHCI: Fix softreset failed issue of Port Multiplier Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100 [PATCH 3.19.y-ckt 147/160] amd-xgbe: fix a couple timeout loops Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100 [PATCH 3.19.y-ckt 141/160] sctp: convert sack_needed and sack_generation to bits Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100 [PATCH 3.19.y-ckt 093/160] genirq: Prevent chip buslock deadlock Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100 [PATCH 3.19.y-ckt 104/160] powerpc/powernv: Fix the overflow of OPAL message notifiers head array Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100 [PATCH 3.19.y-ckt 107/160] s390/dis: Fix handling of format specifiers Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100 [PATCH 3.19.y-ckt 106/160] ALSA: hda - Set SKL+ hda controller power at freeze() and thaw() Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100 [PATCH 3.19.y-ckt 128/160] ASoC: arizona: Fix bclk for sample rates that are multiple of 4kHz Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100 [PATCH 3.19.y-ckt 009/160] sctp: update the netstamp_needed counter when copying sockets Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 116/160] xen/pciback: Return error on XEN_PCI_OP_enable_msix when device has MSI or MSI-X enabled Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 110/160] xen-netback: use RING_COPY_REQUEST() throughout Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 158/160] net: possible use after free in dst_release Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 051/160] net: mvpp2: fix buffers' DMA handling on RX path Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 055/160] vhost: relax log address alignment Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 067/160] dm thin metadata: fix bug when taking a metadata snapshot Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 160/160] firmware: dmi_scan: Fix UUID endianness for SMBIOS >= 2.6 Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 046/160] ARM: 8465/1: mm: keep reserved ASIDs in sync with mm after multiple rollovers Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 010/160] sctp: also copy sk_tsflags when copying the socket Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 103/160] ARC: dw2 unwind: Ignore CIE version !=1 gracefully instead of bailing Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 002/160] sched/wait: Fix signal handling in bit wait helpers Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 109/160] xen-netback: don't use last request to determine minimum Tx credit Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 105/160] powerpc/powernv: pr_warn_once on unsupported OPAL_MSG type Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 081/160] powercap / RAPL: fix BIOS lock check Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 023/160] KVM: x86: Reload pit counters for all channels when restoring state Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 080/160] USB: add quirk for devices with broken LPM Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 021/160] af_unix: Revert 'lock_interruptible' in stream receive code Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 049/160] ALSA: rme96: Fix unexpected volume reset after rate changes Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 079/160] xhci: fix usb2 resume timing and races. Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 132/160] ftrace/scripts: Fix incorrect use of sprintf in recordmcount Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 056/160] virtio: fix memory leak of virtio ida cache layers Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 007/160] atl1c: Improve driver not to do order 4 GFP_ATOMIC allocation Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 140/160] usb: musb: USB_TI_CPPI41_DMA requires dmaengine support Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 083/160] mm: hugetlb: fix hugepage memory leak caused by wrong reserve count Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 094/160] ALSA: usb-audio: Add a more accurate volume quirk for AudioQuest DragonFly Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 157/160] net: sched: fix missing free per cpu on qstats Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 135/160] ARM: versatile: fix MMC/SD interrupt assignment Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100 [PATCH 3.19.y-ckt 070/160] ASoC: es8328: Fix deemphasis values Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100 [PATCH 3.19.y-ckt 096/160] ARM: 8471/1: need to save/restore arm register(r11) when it is corrupted Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100 [PATCH 3.19.y-ckt 061/160] radeon/cik: Fix GFX IB test on Big-Endian Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100 [PATCH 3.19.y-ckt 043/160] usb: Use the USB_SS_MULT() macro to decode burst multiplier for log message Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100 [PATCH 3.19.y-ckt 146/160] mISDN: fix a loop count Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100 [PATCH 3.19.y-ckt 145/160] sh_eth: fix TX buffer byte-swapping Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100 [PATCH 3.19.y-ckt 123/160] x86/mce: Ensure offline CPUs don't participate in rendezvous process Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100 [PATCH 3.19.y-ckt 013/160] net: add validation for the socket syscall protocol argument Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100 [PATCH 3.19.y-ckt 078/160] ses: fix additional element traversal bug Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100 [PATCH 3.19.y-ckt 075/160] vgaarb: fix signal handling in vga_get() Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100 [PATCH 3.19.y-ckt 089/160] sh64: fix __NR_fgetxattr Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
csiph-web