From c18acd73ffc209def08003a1927473096f66c5ad Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Mon, 22 Oct 2007 11:03:35 +1000 Subject: Allow guest to specify syscall vector to use. (Based on Ron Minnich's LGUEST_PLAN9_SYSCALL patch). This patch allows Guests to specify what system call vector they want, and we try to reserve it. We only allow one non-Linux system call vector, to try to avoid DoS on the Host. Signed-off-by: Rusty Russell --- drivers/lguest/core.c | 30 ++++++++++++++++++++---------- 1 file changed, 20 insertions(+), 10 deletions(-) (limited to 'drivers/lguest/core.c') diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c index 02556bae9e9f..41b26e592d38 100644 --- a/drivers/lguest/core.c +++ b/drivers/lguest/core.c @@ -281,37 +281,47 @@ static int __init init(void) /* First we put the Switcher up in very high virtual memory. */ err = map_switcher(); if (err) - return err; + goto out; /* Now we set up the pagetable implementation for the Guests. */ err = init_pagetables(switcher_page, SHARED_SWITCHER_PAGES); - if (err) { - unmap_switcher(); - return err; - } + if (err) + goto unmap; /* The I/O subsystem needs some things initialized. */ lguest_io_init(); + /* We might need to reserve an interrupt vector. */ + err = init_interrupts(); + if (err) + goto free_pgtables; + /* /dev/lguest needs to be registered. */ err = lguest_device_init(); - if (err) { - free_pagetables(); - unmap_switcher(); - return err; - } + if (err) + goto free_interrupts; /* Finally we do some architecture-specific setup. */ lguest_arch_host_init(); /* All good! */ return 0; + +free_interrupts: + free_interrupts(); +free_pgtables: + free_pagetables(); +unmap: + unmap_switcher(); +out: + return err; } /* Cleaning up is just the same code, backwards. With a little French. */ static void __exit fini(void) { lguest_device_remove(); + free_interrupts(); free_pagetables(); unmap_switcher(); -- cgit v1.2.3