x86/arch_prctl/vdso: Add ARCH_MAP_VDSO_*

Add API to change vdso blob type with arch_prctl.
As this is usefull only by needs of CRIU, expose
this interface under CONFIG_CHECKPOINT_RESTORE.

Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Cc: 0x7f454c46@gmail.com
Cc: oleg@redhat.com
Cc: linux-mm@kvack.org
Cc: gorcunov@openvz.org
Cc: xemul@virtuozzo.com
Link: http://lkml.kernel.org/r/20160905133308.28234-4-dsafonov@virtuozzo.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

6 files changed, 78 insertions, 10 deletions

diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c
index 5bcb25a9e573..4459e73e234d 100644
--- a/arch/x86/entry/vdso/vma.c
+++ b/arch/x86/entry/vdso/vma.c
@@ -176,6 +176,16 @@ static int vvar_fault(const struct vm_special_mapping *sm,
         return VM_FAULT_SIGBUS;
 }
 
+static const struct vm_special_mapping vdso_mapping = {
+        .name = "[vdso]",
+        .fault = vdso_fault,
+        .mremap = vdso_mremap,
+};
+static const struct vm_special_mapping vvar_mapping = {
+        .name = "[vvar]",
+        .fault = vvar_fault,
+};
+
 /*
  * Add vdso and vvar mappings to current process.
  * @image          - blob to map
@@ -188,16 +198,6 @@ static int map_vdso(const struct vdso_image *image, unsigned long addr)
         unsigned long text_start;
         int ret = 0;
 
-        static const struct vm_special_mapping vdso_mapping = {
-                .name = "[vdso]",
-                .fault = vdso_fault,
-                .mremap = vdso_mremap,
-        };
-        static const struct vm_special_mapping vvar_mapping = {
-                .name = "[vvar]",
-                .fault = vvar_fault,
-        };
-
         if (down_write_killable(&mm->mmap_sem))
                 return -EINTR;
 
@@ -256,6 +256,31 @@ static int map_vdso_randomized(const struct vdso_image *image)
         return map_vdso(image, addr);
 }
 
+int map_vdso_once(const struct vdso_image *image, unsigned long addr)
+{
+        struct mm_struct *mm = current->mm;
+        struct vm_area_struct *vma;
+
+        down_write(&mm->mmap_sem);
+        /*
+         * Check if we have already mapped vdso blob - fail to prevent
+         * abusing from userspace install_speciall_mapping, which may
+         * not do accounting and rlimit right.
+         * We could search vma near context.vdso, but it's a slowpath,
+         * so let's explicitely check all VMAs to be completely sure.
+         */
+        for (vma = mm->mmap; vma; vma = vma->vm_next) {
+                if (vma_is_special_mapping(vma, &vdso_mapping) ||
+                                vma_is_special_mapping(vma, &vvar_mapping)) {
+                        up_write(&mm->mmap_sem);
+                        return -EEXIST;
+                }
+        }
+        up_write(&mm->mmap_sem);
+
+        return map_vdso(image, addr);
+}
+
 #if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
 static int load_vdso32(void)
 {
diff --git a/arch/x86/include/asm/vdso.h b/arch/x86/include/asm/vdso.h
index 43dc55be524e..2444189cbe28 100644
--- a/arch/x86/include/asm/vdso.h
+++ b/arch/x86/include/asm/vdso.h
@@ -41,6 +41,8 @@ extern const struct vdso_image vdso_image_32;
 
 extern void __init init_vdso_image(const struct vdso_image *image);
 
+extern int map_vdso_once(const struct vdso_image *image, unsigned long addr);
+
 #endif /* __ASSEMBLER__ */
 
 #endif /* _ASM_X86_VDSO_H */
diff --git a/arch/x86/include/uapi/asm/prctl.h b/arch/x86/include/uapi/asm/prctl.h
index 3ac5032fae09..ae135de547f5 100644
--- a/arch/x86/include/uapi/asm/prctl.h
+++ b/arch/x86/include/uapi/asm/prctl.h
@@ -6,4 +6,10 @@
 #define ARCH_GET_FS 0x1003
 #define ARCH_GET_GS 0x1004
 
+#ifdef CONFIG_CHECKPOINT_RESTORE
+# define ARCH_MAP_VDSO_X32      0x2001
+# define ARCH_MAP_VDSO_32       0x2002
+# define ARCH_MAP_VDSO_64       0x2003
+#endif
+
 #endif /* _ASM_X86_PRCTL_H */
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 63236d8f84bf..f240a465920b 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -49,6 +49,7 @@
 #include <asm/debugreg.h>
 #include <asm/switch_to.h>
 #include <asm/xen/hypervisor.h>
+#include <asm/vdso.h>
 
 asmlinkage extern void ret_from_fork(void);
 
@@ -524,6 +525,17 @@ void set_personality_ia32(bool x32)
 }
 EXPORT_SYMBOL_GPL(set_personality_ia32);
 
+static long prctl_map_vdso(const struct vdso_image *image, unsigned long addr)
+{
+        int ret;
+
+        ret = map_vdso_once(image, addr);
+        if (ret)
+                return ret;
+
+        return (long)image->size;
+}
+
 long do_arch_prctl(struct task_struct *task, int code, unsigned long addr)
 {
         int ret = 0;
@@ -577,6 +589,19 @@ long do_arch_prctl(struct task_struct *task, int code, unsigned long addr)
                 break;
         }
 
+#ifdef CONFIG_CHECKPOINT_RESTORE
+#ifdef CONFIG_X86_X32
+        case ARCH_MAP_VDSO_X32:
+                return prctl_map_vdso(&vdso_image_x32, addr);
+#endif
+#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
+        case ARCH_MAP_VDSO_32:
+                return prctl_map_vdso(&vdso_image_32, addr);
+#endif
+        case ARCH_MAP_VDSO_64:
+                return prctl_map_vdso(&vdso_image_64, addr);
+#endif
+
         default:
                 ret = -EINVAL;
                 break;
diff --git a/include/linux/mm.h b/include/linux/mm.h
index ef815b9cd426..5f14534f0c90 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2019,6 +2019,8 @@ extern struct file *get_task_exe_file(struct task_struct *task);
 extern bool may_expand_vm(struct mm_struct *, vm_flags_t, unsigned long npages);
 extern void vm_stat_account(struct mm_struct *, vm_flags_t, long npages);
 
+extern bool vma_is_special_mapping(const struct vm_area_struct *vma,
+                                   const struct vm_special_mapping *sm);
 extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
                                    unsigned long addr, unsigned long len,
                                    unsigned long flags,
diff --git a/mm/mmap.c b/mm/mmap.c
index ca9d91bca0d6..6373ebd358c0 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3063,6 +3063,14 @@ out:
         return ERR_PTR(ret);
 }
 
+bool vma_is_special_mapping(const struct vm_area_struct *vma,
+        const struct vm_special_mapping *sm)
+{
+        return vma->vm_private_data == sm &&
+                (vma->vm_ops == &special_mapping_vmops ||
+                 vma->vm_ops == &legacy_special_mapping_vmops);
+}
+
 /*
  * Called with mm->mmap_sem held for writing.
  * Insert a new vma covering the given region, with the given flags.