From 228df5c91c87d98383f02ee07bbfdc001ba0ab0f Mon Sep 17 00:00:00 2001 From: Ian Campbell Date: Fri, 15 Jan 2016 13:23:43 +0000 Subject: [PATCH] xen: domainbuild: reopen libxenctrl interface after forking for domain watcher. Using an existing libxenctrl handle after a fork was never particularly safe (especially if foreign mappings existed at the time of the fork) and the xc fd has been unavailable for many releases. Reopen the handle after fork and therefore do away with xc_fd(). Signed-off-by: Ian Campbell Acked-by: Stefano Stabellini Signed-off-by: Stefano Stabellini --- hw/xenpv/xen_domainbuild.c | 9 ++++++--- include/hw/xen/xen_common.h | 17 ----------------- 2 files changed, 6 insertions(+), 20 deletions(-) diff --git a/hw/xenpv/xen_domainbuild.c b/hw/xenpv/xen_domainbuild.c index ac0e5ac9f0..f9be029b0e 100644 --- a/hw/xenpv/xen_domainbuild.c +++ b/hw/xenpv/xen_domainbuild.c @@ -174,12 +174,15 @@ static int xen_domain_watcher(void) for (i = 3; i < n; i++) { if (i == fd[0]) continue; - if (i == xc_fd(xen_xc)) { - continue; - } close(i); } + /* + * Reopen xc interface, since the original is unsafe after fork + * and was closed above. + */ + xen_xc = xc_interface_open(0, 0, 0); + /* ignore term signals */ signal(SIGINT, SIG_IGN); signal(SIGTERM, SIG_IGN); diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h index 19f1577e8f..be7a915984 100644 --- a/include/hw/xen/xen_common.h +++ b/include/hw/xen/xen_common.h @@ -116,12 +116,6 @@ static inline XenXC xen_xc_interface_open(void *logger, void *dombuild_logger, /* See below for xenforeignmemory_* APIs */ -static inline int xc_fd(int xen_xc) -{ - return xen_xc; -} - - static inline int xc_domain_populate_physmap_exact (XenXC xc_handle, uint32_t domid, unsigned long nr_extents, unsigned int extent_order, unsigned int mem_flags, xen_pfn_t *extent_start) @@ -193,11 +187,6 @@ static inline XenXC xen_xc_interface_open(void *logger, void *dombuild_logger, /* See below for xenforeignmemory_* APIs */ -/* FIXME There is no way to have the xen fd */ -static inline int xc_fd(xc_interface *xen_xc) -{ - return -1; -} #else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 471 */ typedef xc_interface *XenXC; @@ -214,12 +203,6 @@ static inline XenXC xen_xc_interface_open(void *logger, void *dombuild_logger, { return xc_interface_open(logger, dombuild_logger, open_flags); } - -/* FIXME There is now way to have the xen fd */ -static inline int xc_fd(xc_interface *xen_xc) -{ - return -1; -} #endif /* Xen before 4.2 */