Jan Beulich cf47a83fb0 xen/hypercall: fix hypercall fallback code for very old hypervisors ... While copying the argument structures in HYPERVISOR_event_channel_op() and HYPERVISOR_physdev_op() into the local variable is sufficiently safe even if the actual structure is smaller than the container one, copying back eventual output values the same way isn't: This may collide with on-stack variables (particularly "rc") which may change between the first and second memcpy() (i.e. the second memcpy() could discard that change). Move the fallback code into out-of-line functions, and handle all of the operations known by this old a hypervisor individually: Some don't require copying back anything at all, and for the rest use the individual argument structures' sizes rather than the container's. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Jan Beulich <jbeulich@suse.com> [v2: Reduce #define/#undef usage in HYPERVISOR_physdev_op_compat().] [v3: Fix compile errors when modules use said hypercalls] [v4: Add xen_ prefix to the HYPERCALL_..] [v5: Alter the name and only EXPORT_SYMBOL_GPL one of them] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>		2012-11-04 10:40:42 -05:00
..
xen-pciback	Merge commit 'v3.7-rc1' into stable/for-linus-3.7	2012-10-19 15:19:19 -04:00
xenbus	xen/xenbus: fix overflow check in xenbus_file_write()	2012-10-30 09:57:49 -04:00
xenfs	userns: Convert xenfs to use kuid and kgid where appropriate	2012-09-21 03:13:06 -07:00
acpi.c
balloon.c	xen: balloon: use correct type for frame_list	2012-10-19 15:18:00 -04:00
biomerge.c
cpu_hotplug.c
dbgp.c	xen: dbgp: Fix warning when CONFIG_PCI is not enabled.	2012-10-19 15:19:37 -04:00
events.c	xen: events: pirq_check_eoi_map is X86 specific	2012-10-19 15:17:53 -04:00
evtchn.c
fallback.c	xen/hypercall: fix hypercall fallback code for very old hypervisors	2012-11-04 10:40:42 -05:00
features.c
gntalloc.c	mm: kill vma flag VM_RESERVED and mm->reserved_vm counter	2012-10-09 16:22:19 +09:00
gntdev.c	xen/gntdev: don't leak memory from IOCTL_GNTDEV_MAP_GRANT_REF	2012-10-30 09:27:32 -04:00
grant-table.c	Merge commit 'v3.7-rc1' into stable/for-linus-3.7	2012-10-19 15:19:19 -04:00
Kconfig
Makefile	xen/hypercall: fix hypercall fallback code for very old hypervisors	2012-11-04 10:40:42 -05:00
manage.c
mcelog.c
pci.c
pcpu.c
platform-pci.c
privcmd.c	mm: kill vma flag VM_RESERVED and mm->reserved_vm counter	2012-10-09 16:22:19 +09:00
privcmd.h
swiotlb-xen.c	Merge branch 'stable/late-swiotlb.v3.3' into stable/for-linus-3.7	2012-09-22 20:01:24 -04:00
sys-hypervisor.c	xen: sysfs: fix build warning.	2012-10-19 15:17:51 -04:00
tmem.c
xen-acpi-processor.c
xen-balloon.c
xen-selfballoon.c
xencomm.c