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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] xenpaging: update xch usage
Fix double-free in xc_interface_close(), xenpaging_teardown() releases
the *xch already. Remove second xc_interface_close() call.
Fix DPRINTF/ERROR usage, both macros reference a xch variable in local
scope. If xc_interface_open fails for some reason, and after
xc_interface_close, both can not be used anymore. Use standard printf
for this case.
Instead of passing xch around, use the handle from *paging. In the
updated functions, use the local xch variable.
Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
---
tools/xenpaging/policy.h | 3 -
tools/xenpaging/policy_default.c | 4 +-
tools/xenpaging/xenpaging.c | 65 +++++++++++++++++++--------------------
3 files changed, 36 insertions(+), 36 deletions(-)
--- xen-unstable.hg-4.1.22447.orig/tools/xenpaging/policy.h
+++ xen-unstable.hg-4.1.22447/tools/xenpaging/policy.h
@@ -29,8 +29,7 @@
int policy_init(xenpaging_t *paging);
-int policy_choose_victim(xc_interface *xch,
- xenpaging_t *paging, domid_t domain_id,
+int policy_choose_victim(xenpaging_t *paging, domid_t domain_id,
xenpaging_victim_t *victim);
void policy_notify_paged_out(domid_t domain_id, unsigned long gfn);
void policy_notify_paged_in(domid_t domain_id, unsigned long gfn);
--- xen-unstable.hg-4.1.22447.orig/tools/xenpaging/policy_default.c
+++ xen-unstable.hg-4.1.22447/tools/xenpaging/policy_default.c
@@ -67,10 +67,10 @@ int policy_init(xenpaging_t *paging)
return rc;
}
-int policy_choose_victim(xc_interface *xch,
- xenpaging_t *paging, domid_t domain_id,
+int policy_choose_victim(xenpaging_t *paging, domid_t domain_id,
xenpaging_victim_t *victim)
{
+ struct xc_interface *xch = paging->xc_handle;
unsigned long wrap = current_gfn;
ASSERT(victim != NULL);
--- xen-unstable.hg-4.1.22447.orig/tools/xenpaging/xenpaging.c
+++ xen-unstable.hg-4.1.22447/tools/xenpaging/xenpaging.c
@@ -79,7 +79,7 @@ static void *init_page(void)
return NULL;
}
-xenpaging_t *xenpaging_init(xc_interface **xch_r, domid_t domain_id)
+xenpaging_t *xenpaging_init(domid_t domain_id)
{
xenpaging_t *paging;
xc_interface *xch;
@@ -90,7 +90,6 @@ xenpaging_t *xenpaging_init(xc_interface
goto err_iface;
DPRINTF("xenpaging init\n");
- *xch_r = xch;
/* Allocate memory */
paging = malloc(sizeof(xenpaging_t));
@@ -128,7 +127,7 @@ xenpaging_t *xenpaging_init(xc_interface
mem_event_ring_lock_init(&paging->mem_event);
/* Initialise Xen */
- rc = xc_mem_event_enable(paging->xc_handle, paging->mem_event.domain_id,
+ rc = xc_mem_event_enable(xch, paging->mem_event.domain_id,
paging->mem_event.shared_page,
paging->mem_event.ring_page);
if ( rc != 0 )
@@ -175,7 +174,7 @@ xenpaging_t *xenpaging_init(xc_interface
goto err;
}
- rc = xc_get_platform_info(paging->xc_handle, domain_id,
+ rc = xc_get_platform_info(xch, domain_id,
paging->platform_info);
if ( rc != 1 )
{
@@ -191,7 +190,7 @@ xenpaging_t *xenpaging_init(xc_interface
goto err;
}
- rc = xc_domain_getinfolist(paging->xc_handle, domain_id, 1,
+ rc = xc_domain_getinfolist(xch, domain_id, 1,
paging->domain_info);
if ( rc != 1 )
{
@@ -224,6 +223,7 @@ xenpaging_t *xenpaging_init(xc_interface
err:
if ( paging )
{
+ xc_interface_close(xch);
if ( paging->mem_event.shared_page )
{
munlock(paging->mem_event.shared_page, PAGE_SIZE);
@@ -246,15 +246,18 @@ xenpaging_t *xenpaging_init(xc_interface
return NULL;
}
-int xenpaging_teardown(xc_interface *xch, xenpaging_t *paging)
+int xenpaging_teardown(xenpaging_t *paging)
{
int rc;
+ struct xc_interface *xch;
if ( paging == NULL )
return 0;
+ xch = paging->xc_handle;
+ paging->xc_handle = NULL;
/* Tear down domain paging in Xen */
- rc = xc_mem_event_disable(paging->xc_handle, paging->mem_event.domain_id);
+ rc = xc_mem_event_disable(xch, paging->mem_event.domain_id);
if ( rc != 0 )
{
ERROR("Error tearing down domain paging in xen");
@@ -277,12 +280,11 @@ int xenpaging_teardown(xc_interface *xch
paging->mem_event.xce_handle = -1;
/* Close connection to Xen */
- rc = xc_interface_close(paging->xc_handle);
+ rc = xc_interface_close(xch);
if ( rc != 0 )
{
ERROR("Error closing connection to xen");
}
- paging->xc_handle = NULL;
return 0;
@@ -336,9 +338,9 @@ static int put_response(mem_event_t *mem
return 0;
}
-int xenpaging_evict_page(xc_interface *xch, xenpaging_t *paging,
- xenpaging_victim_t *victim, int fd, int i)
+int xenpaging_evict_page(xenpaging_t *paging, xenpaging_victim_t *victim, int
fd, int i)
{
+ struct xc_interface *xch = paging->xc_handle;
void *page;
unsigned long gfn;
int ret;
@@ -348,7 +350,7 @@ int xenpaging_evict_page(xc_interface *x
/* Map page */
gfn = victim->gfn;
ret = -EFAULT;
- page = xc_map_foreign_pages(paging->xc_handle, victim->domain_id,
+ page = xc_map_foreign_pages(xch, victim->domain_id,
PROT_READ | PROT_WRITE, &gfn, 1);
if ( page == NULL )
{
@@ -371,7 +373,7 @@ int xenpaging_evict_page(xc_interface *x
munmap(page, PAGE_SIZE);
/* Tell Xen to evict page */
- ret = xc_mem_paging_evict(paging->xc_handle, paging->mem_event.domain_id,
+ ret = xc_mem_paging_evict(xch, paging->mem_event.domain_id,
victim->gfn);
if ( ret != 0 )
{
@@ -409,10 +411,9 @@ static int xenpaging_resume_page(xenpagi
return ret;
}
-static int xenpaging_populate_page(
- xc_interface *xch, xenpaging_t *paging,
- uint64_t *gfn, int fd, int i)
+static int xenpaging_populate_page(xenpaging_t *paging, uint64_t *gfn, int fd,
int i)
{
+ struct xc_interface *xch = paging->xc_handle;
unsigned long _gfn;
void *page;
int ret;
@@ -422,7 +423,7 @@ static int xenpaging_populate_page(
do
{
/* Tell Xen to allocate a page for the domain */
- ret = xc_mem_paging_prep(paging->xc_handle,
paging->mem_event.domain_id,
+ ret = xc_mem_paging_prep(xch, paging->mem_event.domain_id,
_gfn);
if ( ret != 0 )
{
@@ -441,7 +442,7 @@ static int xenpaging_populate_page(
/* Map page */
ret = -EFAULT;
- page = xc_map_foreign_pages(paging->xc_handle, paging->mem_event.domain_id,
+ page = xc_map_foreign_pages(xch, paging->mem_event.domain_id,
PROT_READ | PROT_WRITE, &_gfn, 1);
*gfn = _gfn;
if ( page == NULL )
@@ -464,15 +465,16 @@ static int xenpaging_populate_page(
return ret;
}
-static int evict_victim(xc_interface *xch, xenpaging_t *paging, domid_t
domain_id,
+static int evict_victim(xenpaging_t *paging, domid_t domain_id,
xenpaging_victim_t *victim, int fd, int i)
{
+ struct xc_interface *xch = paging->xc_handle;
int j = 0;
int ret;
do
{
- ret = policy_choose_victim(xch, paging, domain_id, victim);
+ ret = policy_choose_victim(paging, domain_id, victim);
if ( ret != 0 )
{
if ( ret != -ENOSPC )
@@ -485,10 +487,10 @@ static int evict_victim(xc_interface *xc
ret = -EINTR;
goto out;
}
- ret = xc_mem_paging_nominate(paging->xc_handle,
+ ret = xc_mem_paging_nominate(xch,
paging->mem_event.domain_id, victim->gfn);
if ( ret == 0 )
- ret = xenpaging_evict_page(xch, paging, victim, fd, i);
+ ret = xenpaging_evict_page(paging, victim, fd, i);
else
{
if ( j++ % 1000 == 0 )
@@ -538,13 +540,14 @@ int main(int argc, char *argv[])
srand(time(NULL));
/* Initialise domain paging */
- paging = xenpaging_init(&xch, domain_id);
+ paging = xenpaging_init(domain_id);
if ( paging == NULL )
{
- ERROR("Error initialising paging");
+ fprintf(stderr, "Error initialising paging");
return 1;
}
+ xch = paging->xc_handle;
DPRINTF("starting %s %u %d\n", argv[0], domain_id, num_pages);
/* Open file */
@@ -576,7 +579,7 @@ int main(int argc, char *argv[])
memset(victims, 0, sizeof(xenpaging_victim_t) * num_pages);
for ( i = 0; i < num_pages; i++ )
{
- rc = evict_victim(xch, paging, domain_id, &victims[i], fd, i);
+ rc = evict_victim(paging, domain_id, &victims[i], fd, i);
if ( rc == -ENOSPC )
break;
if ( rc == -EINTR )
@@ -629,7 +632,7 @@ int main(int argc, char *argv[])
}
/* Populate the page */
- rc = xenpaging_populate_page(xch, paging, &req.gfn, fd, i);
+ rc = xenpaging_populate_page(paging, &req.gfn, fd, i);
if ( rc != 0 )
{
ERROR("Error populating page");
@@ -650,7 +653,7 @@ int main(int argc, char *argv[])
}
/* Evict a new page to replace the one we just paged in */
- evict_victim(xch, paging, domain_id, &victims[i], fd, i);
+ evict_victim(paging, domain_id, &victims[i], fd, i);
}
else
{
@@ -688,16 +691,14 @@ int main(int argc, char *argv[])
free(victims);
/* Tear down domain paging */
- rc1 = xenpaging_teardown(xch, paging);
+ rc1 = xenpaging_teardown(paging);
if ( rc1 != 0 )
- ERROR("Error tearing down paging");
+ fprintf(stderr, "Error tearing down paging");
if ( rc == 0 )
rc = rc1;
- xc_interface_close(xch);
-
- DPRINTF("xenpaging exit code %d\n", rc);
+ printf("xenpaging exit code %d\n", rc);
return rc;
}
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