From: Matthew Garrett
Git-commit: Not yet, reviewing
Patch-mainline: Not yet, reviewing
References: fate#314486
Target: SLE-11 SP3
Any hardware that can potentially generate DMA has to be locked down from
userspace in order to avoid it being possible for an attacker to cause
arbitrary kernel behaviour. Default to paranoid - in future we can
potentially relax this for sufficiently IOMMU-isolated devices.
Signed-off-by: Matthew Garrett
Acked-by: Lee, Chun-Yi
---
drivers/pci/pci-sysfs.c | 9 +++++++++
drivers/pci/proc.c | 8 +++++++-
drivers/pci/syscall.c | 2 +-
3 files changed, 17 insertions(+), 2 deletions(-)
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -546,6 +546,9 @@ pci_write_config(struct file* filp, stru
loff_t init_off = off;
u8 *data = (u8*) buf;
+ if (!capable(CAP_COMPROMISE_KERNEL))
+ return -EPERM;
+
if (off > dev->cfg_size)
return 0;
if (off + count > dev->cfg_size) {
@@ -852,6 +855,9 @@ pci_mmap_resource(struct kobject *kobj,
resource_size_t start, end;
int i;
+ if (!capable(CAP_COMPROMISE_KERNEL))
+ return -EPERM;
+
for (i = 0; i < PCI_ROM_RESOURCE; i++)
if (res == &pdev->resource[i])
break;
@@ -959,6 +965,9 @@ pci_write_resource_io(struct file *filp,
struct bin_attribute *attr, char *buf,
loff_t off, size_t count)
{
+ if (!capable(CAP_COMPROMISE_KERNEL))
+ return -EPERM;
+
return pci_resource_io(filp, kobj, attr, buf, off, count, true);
}
--- a/drivers/pci/proc.c
+++ b/drivers/pci/proc.c
@@ -139,6 +139,9 @@ proc_bus_pci_write(struct file *file, co
int size = dp->size;
int cnt;
+ if (!capable(CAP_COMPROMISE_KERNEL))
+ return -EPERM;
+
if (pos >= size)
return 0;
if (nbytes >= size)
@@ -219,6 +222,9 @@ static long proc_bus_pci_ioctl(struct fi
#endif /* HAVE_PCI_MMAP */
int ret = 0;
+ if (!capable(CAP_COMPROMISE_KERNEL))
+ return -EPERM;
+
switch (cmd) {
case PCIIOC_CONTROLLER:
ret = pci_domain_nr(dev->bus);
@@ -259,7 +265,7 @@ static int proc_bus_pci_mmap(struct file
struct pci_filp_private *fpriv = file->private_data;
int i, ret;
- if (!capable(CAP_SYS_RAWIO))
+ if (!capable(CAP_SYS_RAWIO) || !capable(CAP_COMPROMISE_KERNEL))
return -EPERM;
/* Make sure the caller is mapping a real resource for this device */
--- a/drivers/pci/syscall.c
+++ b/drivers/pci/syscall.c
@@ -92,7 +92,7 @@ SYSCALL_DEFINE5(pciconfig_write, unsigne
u32 dword;
int err = 0;
- if (!capable(CAP_SYS_ADMIN))
+ if (!capable(CAP_SYS_ADMIN) || !capable(CAP_COMPROMISE_KERNEL))
return -EPERM;
dev = pci_get_bus_and_slot(bus, dfn);
--
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