#include <asm/vgtod.h>
#include <asm/proto.h>
#include <asm/vdso.h>
-
-#include "vextern.h" /* Just for VMAGIC. */
-#undef VEXTERN
+#include <asm/page.h>
unsigned int __read_mostly vdso_enabled = 1;
extern char vdso_start[], vdso_end[];
extern unsigned short vdso_sync_cpuid;
-static struct page **vdso_pages;
+extern struct page *vdso_pages[];
static unsigned vdso_size;
-static inline void *var_ref(void *p, char *name)
+#ifdef CONFIG_X86_X32_ABI
+extern char vdsox32_start[], vdsox32_end[];
+extern struct page *vdsox32_pages[];
+static unsigned vdsox32_size;
+
+static void __init patch_vdsox32(void *vdso, size_t len)
{
- if (*(void **)p != (void *)VMAGIC) {
- printk("VDSO: variable %s broken\n", name);
- vdso_enabled = 0;
+ Elf32_Ehdr *hdr = vdso;
+ Elf32_Shdr *sechdrs, *alt_sec = 0;
+ char *secstrings;
+ void *alt_data;
+ int i;
+
+ BUG_ON(len < sizeof(Elf32_Ehdr));
+ BUG_ON(memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0);
+
+ sechdrs = (void *)hdr + hdr->e_shoff;
+ secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
+
+ for (i = 1; i < hdr->e_shnum; i++) {
+ Elf32_Shdr *shdr = &sechdrs[i];
+ if (!strcmp(secstrings + shdr->sh_name, ".altinstructions")) {
+ alt_sec = shdr;
+ goto found;
+ }
}
- return p;
+
+ /* If we get here, it's probably a bug. */
+ pr_warning("patch_vdsox32: .altinstructions not found\n");
+ return; /* nothing to patch */
+
+found:
+ alt_data = (void *)hdr + alt_sec->sh_offset;
+ apply_alternatives(alt_data, alt_data + alt_sec->sh_size);
}
+#endif
-static int __init init_vdso_vars(void)
+static void __init patch_vdso64(void *vdso, size_t len)
{
- int npages = (vdso_end - vdso_start + PAGE_SIZE - 1) / PAGE_SIZE;
+ Elf64_Ehdr *hdr = vdso;
+ Elf64_Shdr *sechdrs, *alt_sec = 0;
+ char *secstrings;
+ void *alt_data;
int i;
- char *vbase;
- vdso_size = npages << PAGE_SHIFT;
- vdso_pages = kmalloc(sizeof(struct page *) * npages, GFP_KERNEL);
- if (!vdso_pages)
- goto oom;
- for (i = 0; i < npages; i++) {
- struct page *p;
- p = alloc_page(GFP_KERNEL);
- if (!p)
- goto oom;
- vdso_pages[i] = p;
- copy_page(page_address(p), vdso_start + i*PAGE_SIZE);
- }
+ BUG_ON(len < sizeof(Elf64_Ehdr));
+ BUG_ON(memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0);
- vbase = vmap(vdso_pages, npages, 0, PAGE_KERNEL);
- if (!vbase)
- goto oom;
+ sechdrs = (void *)hdr + hdr->e_shoff;
+ secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
- if (memcmp(vbase, "\177ELF", 4)) {
- printk("VDSO: I'm broken; not ELF\n");
- vdso_enabled = 0;
+ for (i = 1; i < hdr->e_shnum; i++) {
+ Elf64_Shdr *shdr = &sechdrs[i];
+ if (!strcmp(secstrings + shdr->sh_name, ".altinstructions")) {
+ alt_sec = shdr;
+ goto found;
+ }
}
-#define VEXTERN(x) \
- *(typeof(__ ## x) **) var_ref(VDSO64_SYMBOL(vbase, x), #x) = &__ ## x;
-#include "vextern.h"
-#undef VEXTERN
- vunmap(vbase);
- return 0;
+ /* If we get here, it's probably a bug. */
+ pr_warning("patch_vdso64: .altinstructions not found\n");
+ return; /* nothing to patch */
- oom:
- printk("Cannot allocate vdso\n");
- vdso_enabled = 0;
- return -ENOMEM;
+found:
+ alt_data = (void *)hdr + alt_sec->sh_offset;
+ apply_alternatives(alt_data, alt_data + alt_sec->sh_size);
}
-subsys_initcall(init_vdso_vars);
+
+static int __init init_vdso(void)
+{
+ int npages = (vdso_end - vdso_start + PAGE_SIZE - 1) / PAGE_SIZE;
+ int i;
+
+ patch_vdso64(vdso_start, vdso_end - vdso_start);
+
+ vdso_size = npages << PAGE_SHIFT;
+ for (i = 0; i < npages; i++)
+ vdso_pages[i] = virt_to_page(vdso_start + i*PAGE_SIZE);
+
+#ifdef CONFIG_X86_X32_ABI
+ patch_vdsox32(vdsox32_start, vdsox32_end - vdsox32_start);
+ npages = (vdsox32_end - vdsox32_start + PAGE_SIZE - 1) / PAGE_SIZE;
+ vdsox32_size = npages << PAGE_SHIFT;
+ for (i = 0; i < npages; i++)
+ vdsox32_pages[i] = virt_to_page(vdsox32_start + i*PAGE_SIZE);
+#endif
+
+ return 0;
+}
+subsys_initcall(init_vdso);
struct linux_binprm;
addr = start + (offset << PAGE_SHIFT);
if (addr >= end)
addr = end;
+
+ /*
+ * page-align it here so that get_unmapped_area doesn't
+ * align it wrongfully again to the next page. addr can come in 4K
+ * unaligned here as a result of stack start randomization.
+ */
+ addr = PAGE_ALIGN(addr);
+ addr = align_addr(addr, NULL, ALIGN_VDSO);
+
return addr;
}
/* Setup a VMA at program startup for the vsyscall page.
Not called for compat tasks */
-int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
+static int setup_additional_pages(struct linux_binprm *bprm,
+ int uses_interp,
+ struct page **pages,
+ unsigned size)
{
struct mm_struct *mm = current->mm;
unsigned long addr;
return 0;
down_write(&mm->mmap_sem);
- addr = vdso_addr(mm->start_stack, vdso_size);
- addr = get_unmapped_area(NULL, addr, vdso_size, 0, 0);
+ addr = vdso_addr(mm->start_stack, size);
+ addr = get_unmapped_area(NULL, addr, size, 0, 0);
if (IS_ERR_VALUE(addr)) {
ret = addr;
goto up_fail;
current->mm->context.vdso = (void *)addr;
- ret = install_special_mapping(mm, addr, vdso_size,
+ ret = install_special_mapping(mm, addr, size,
VM_READ|VM_EXEC|
- VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC|
- VM_ALWAYSDUMP,
- vdso_pages);
+ VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
+ pages);
if (ret) {
current->mm->context.vdso = NULL;
goto up_fail;
return ret;
}
+int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
+{
+ return setup_additional_pages(bprm, uses_interp, vdso_pages,
+ vdso_size);
+}
+
+#ifdef CONFIG_X86_X32_ABI
+int x32_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
+{
+ return setup_additional_pages(bprm, uses_interp, vdsox32_pages,
+ vdsox32_size);
+}
+#endif
+
static __init int vdso_setup(char *s)
{
vdso_enabled = simple_strtoul(s, NULL, 0);
projects / linux-flexiantxendom0-3.2.10.git / blobdiff