diff options
Diffstat (limited to 'sys/miscfs/procfs/procfs_mem.c')
| -rw-r--r-- | sys/miscfs/procfs/procfs_mem.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/sys/miscfs/procfs/procfs_mem.c b/sys/miscfs/procfs/procfs_mem.c index 3a2f8d2..1e28870 100644 --- a/sys/miscfs/procfs/procfs_mem.c +++ b/sys/miscfs/procfs/procfs_mem.c @@ -48,6 +48,7 @@ #include <sys/param.h> #include <sys/systm.h> #include <sys/lock.h> +#include <sys/mutex.h> #include <sys/proc.h> #include <sys/ptrace.h> #include <sys/user.h> @@ -88,8 +89,14 @@ procfs_rwmem(curp, p, uio) * usage in that process can be messed up. */ vm = p->p_vmspace; - if ((p->p_flag & P_WEXIT) || (vm->vm_refcnt < 1)) + if ((p->p_flag & P_WEXIT)) return EFAULT; + + mtx_lock(&vm_mtx); + if (vm->vm_refcnt < 1) { + mtx_unlock(&vm_mtx); + return EFAULT; + } ++vm->vm_refcnt; /* * The map we want... @@ -207,7 +214,9 @@ procfs_rwmem(curp, p, uio) /* * Now do the i/o move. */ + mtx_unlock(&vm_mtx); error = uiomove((caddr_t)(kva + page_offset), len, uio); + mtx_lock(&vm_mtx); pmap_kremove(kva); @@ -226,6 +235,7 @@ procfs_rwmem(curp, p, uio) kmem_free(kernel_map, kva, PAGE_SIZE); vmspace_free(vm); + mtx_unlock(&vm_mtx); return (error); } |
