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-rw-r--r--arch/x86/include/asm/vdso.h6
-rw-r--r--arch/x86/mm/init_64.c3
-rw-r--r--arch/x86/vdso/vdso2c.h5
-rw-r--r--arch/x86/vdso/vdso32-setup.c7
-rw-r--r--arch/x86/vdso/vma.c25
-rw-r--r--include/linux/mm.h4
-rw-r--r--include/linux/mm_types.h6
-rw-r--r--mm/mmap.c89
8 files changed, 94 insertions, 51 deletions
diff --git a/arch/x86/include/asm/vdso.h b/arch/x86/include/asm/vdso.h
index d0a2c909c72d..30be253dd283 100644
--- a/arch/x86/include/asm/vdso.h
+++ b/arch/x86/include/asm/vdso.h
@@ -7,10 +7,14 @@
#ifndef __ASSEMBLER__
+#include <linux/mm_types.h>
+
struct vdso_image {
void *data;
unsigned long size; /* Always a multiple of PAGE_SIZE */
- struct page **pages; /* Big enough for data/size page pointers */
+
+ /* text_mapping.pages is big enough for data/size page pointers */
+ struct vm_special_mapping text_mapping;
unsigned long alt, alt_len;
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 6f881842116c..9deb59b0baea 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1223,9 +1223,6 @@ int in_gate_area_no_mm(unsigned long addr)
const char *arch_vma_name(struct vm_area_struct *vma)
{
- if (vma->vm_mm && vma->vm_start ==
- (long __force)vma->vm_mm->context.vdso)
- return "[vdso]";
if (vma == &gate_vma)
return "[vsyscall]";
return NULL;
diff --git a/arch/x86/vdso/vdso2c.h b/arch/x86/vdso/vdso2c.h
index ed2e894e89ab..3dcc61e796e9 100644
--- a/arch/x86/vdso/vdso2c.h
+++ b/arch/x86/vdso/vdso2c.h
@@ -136,7 +136,10 @@ static int GOFUNC(void *addr, size_t len, FILE *outfile, const char *name)
fprintf(outfile, "const struct vdso_image %s = {\n", name);
fprintf(outfile, "\t.data = raw_data,\n");
fprintf(outfile, "\t.size = %lu,\n", data_size);
- fprintf(outfile, "\t.pages = pages,\n");
+ fprintf(outfile, "\t.text_mapping = {\n");
+ fprintf(outfile, "\t\t.name = \"[vdso]\",\n");
+ fprintf(outfile, "\t\t.pages = pages,\n");
+ fprintf(outfile, "\t},\n");
if (alt_sec) {
fprintf(outfile, "\t.alt = %lu,\n",
(unsigned long)alt_sec->sh_offset);
diff --git a/arch/x86/vdso/vdso32-setup.c b/arch/x86/vdso/vdso32-setup.c
index c3ed708e50f4..e4f7781ee162 100644
--- a/arch/x86/vdso/vdso32-setup.c
+++ b/arch/x86/vdso/vdso32-setup.c
@@ -119,13 +119,6 @@ __initcall(ia32_binfmt_init);
#else /* CONFIG_X86_32 */
-const char *arch_vma_name(struct vm_area_struct *vma)
-{
- if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso)
- return "[vdso]";
- return NULL;
-}
-
struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
{
return NULL;
diff --git a/arch/x86/vdso/vma.c b/arch/x86/vdso/vma.c
index 8ad0081df7a8..e1513c47872a 100644
--- a/arch/x86/vdso/vma.c
+++ b/arch/x86/vdso/vma.c
@@ -30,7 +30,8 @@ void __init init_vdso_image(const struct vdso_image *image)
BUG_ON(image->size % PAGE_SIZE != 0);
for (i = 0; i < npages; i++)
- image->pages[i] = virt_to_page(image->data + i*PAGE_SIZE);
+ image->text_mapping.pages[i] =
+ virt_to_page(image->data + i*PAGE_SIZE);
apply_alternatives((struct alt_instr *)(image->data + image->alt),
(struct alt_instr *)(image->data + image->alt +
@@ -91,6 +92,10 @@ static int map_vdso(const struct vdso_image *image, bool calculate_addr)
unsigned long addr;
int ret = 0;
static struct page *no_pages[] = {NULL};
+ static struct vm_special_mapping vvar_mapping = {
+ .name = "[vvar]",
+ .pages = no_pages,
+ };
if (calculate_addr) {
addr = vdso_addr(current->mm->start_stack,
@@ -112,21 +117,23 @@ static int map_vdso(const struct vdso_image *image, bool calculate_addr)
/*
* MAYWRITE to allow gdb to COW and set breakpoints
*/
- ret = install_special_mapping(mm,
- addr,
- image->size,
- VM_READ|VM_EXEC|
- VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
- image->pages);
+ vma = _install_special_mapping(mm,
+ addr,
+ image->size,
+ VM_READ|VM_EXEC|
+ VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
+ &image->text_mapping);
- if (ret)
+ if (IS_ERR(vma)) {
+ ret = PTR_ERR(vma);
goto up_fail;
+ }
vma = _install_special_mapping(mm,
addr + image->size,
image->sym_end_mapping - image->size,
VM_READ,
- no_pages);
+ &vvar_mapping);
if (IS_ERR(vma)) {
ret = PTR_ERR(vma);
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 63f8d4efe303..05aab09803e6 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1782,7 +1782,9 @@ extern struct file *get_mm_exe_file(struct mm_struct *mm);
extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
extern struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
unsigned long addr, unsigned long len,
- unsigned long flags, struct page **pages);
+ unsigned long flags,
+ const struct vm_special_mapping *spec);
+/* This is an obsolete alternative to _install_special_mapping. */
extern int install_special_mapping(struct mm_struct *mm,
unsigned long addr, unsigned long len,
unsigned long flags, struct page **pages);
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 8967e20cbe57..22c6f4e16d10 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -510,4 +510,10 @@ static inline void clear_tlb_flush_pending(struct mm_struct *mm)
}
#endif
+struct vm_special_mapping
+{
+ const char *name;
+ struct page **pages;
+};
+
#endif /* _LINUX_MM_TYPES_H */
diff --git a/mm/mmap.c b/mm/mmap.c
index b1202cf81f4b..52bbc9514d9d 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2872,6 +2872,31 @@ int may_expand_vm(struct mm_struct *mm, unsigned long npages)
return 1;
}
+static int special_mapping_fault(struct vm_area_struct *vma,
+ struct vm_fault *vmf);
+
+/*
+ * Having a close hook prevents vma merging regardless of flags.
+ */
+static void special_mapping_close(struct vm_area_struct *vma)
+{
+}
+
+static const char *special_mapping_name(struct vm_area_struct *vma)
+{
+ return ((struct vm_special_mapping *)vma->vm_private_data)->name;
+}
+
+static const struct vm_operations_struct special_mapping_vmops = {
+ .close = special_mapping_close,
+ .fault = special_mapping_fault,
+ .name = special_mapping_name,
+};
+
+static const struct vm_operations_struct legacy_special_mapping_vmops = {
+ .close = special_mapping_close,
+ .fault = special_mapping_fault,
+};
static int special_mapping_fault(struct vm_area_struct *vma,
struct vm_fault *vmf)
@@ -2887,7 +2912,13 @@ static int special_mapping_fault(struct vm_area_struct *vma,
*/
pgoff = vmf->pgoff - vma->vm_pgoff;
- for (pages = vma->vm_private_data; pgoff && *pages; ++pages)
+ if (vma->vm_ops == &legacy_special_mapping_vmops)
+ pages = vma->vm_private_data;
+ else
+ pages = ((struct vm_special_mapping *)vma->vm_private_data)->
+ pages;
+
+ for (; pgoff && *pages; ++pages)
pgoff--;
if (*pages) {
@@ -2900,30 +2931,11 @@ static int special_mapping_fault(struct vm_area_struct *vma,
return VM_FAULT_SIGBUS;
}
-/*
- * Having a close hook prevents vma merging regardless of flags.
- */
-static void special_mapping_close(struct vm_area_struct *vma)
-{
-}
-
-static const struct vm_operations_struct special_mapping_vmops = {
- .close = special_mapping_close,
- .fault = special_mapping_fault,
-};
-
-/*
- * Called with mm->mmap_sem held for writing.
- * Insert a new vma covering the given region, with the given flags.
- * Its pages are supplied by the given array of struct page *.
- * The array can be shorter than len >> PAGE_SHIFT if it's null-terminated.
- * The region past the last page supplied will always produce SIGBUS.
- * The array pointer and the pages it points to are assumed to stay alive
- * for as long as this mapping might exist.
- */
-struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
- unsigned long addr, unsigned long len,
- unsigned long vm_flags, struct page **pages)
+static struct vm_area_struct *__install_special_mapping(
+ struct mm_struct *mm,
+ unsigned long addr, unsigned long len,
+ unsigned long vm_flags, const struct vm_operations_struct *ops,
+ void *priv)
{
int ret;
struct vm_area_struct *vma;
@@ -2940,8 +2952,8 @@ struct vm_area_struct *_install_special_mapping(struct mm_struct *mm,
vma->vm_flags = vm_flags | mm->def_flags | VM_DONTEXPAND | VM_SOFTDIRTY;
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
- vma->vm_ops = &special_mapping_vmops;
- vma->vm_private_data = pages;
+ vma->vm_ops = ops;
+ vma->vm_private_data = priv;
ret = insert_vm_struct(mm, vma);
if (ret)
@@ -2958,12 +2970,31 @@ out:
return ERR_PTR(ret);
}
+/*
+ * Called with mm->mmap_sem held for writing.
+ * Insert a new vma covering the given region, with the given flags.
+ * Its pages are supplied by the given array of struct page *.
+ * The array can be shorter than len >> PAGE_SHIFT if it's null-terminated.
+ * The region past the last page supplied will always produce SIGBUS.
+ * The array pointer and the pages it points to are assumed to stay alive
+ * for as long as this mapping might exist.
+ */
+struct vm_area_struct *_install_special_mapping(
+ struct mm_struct *mm,
+ unsigned long addr, unsigned long len,
+ unsigned long vm_flags, const struct vm_special_mapping *spec)
+{
+ return __install_special_mapping(mm, addr, len, vm_flags,
+ &special_mapping_vmops, (void *)spec);
+}
+
int install_special_mapping(struct mm_struct *mm,
unsigned long addr, unsigned long len,
unsigned long vm_flags, struct page **pages)
{
- struct vm_area_struct *vma = _install_special_mapping(mm,
- addr, len, vm_flags, pages);
+ struct vm_area_struct *vma = __install_special_mapping(
+ mm, addr, len, vm_flags, &legacy_special_mapping_vmops,
+ (void *)pages);
if (IS_ERR(vma))
return PTR_ERR(vma);
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-06-08 13:52:33 +0200