mips/vdso: Support mremap() for vDSO

vDSO VMA address is saved in mm_context for the purpose of using
restorer from vDSO page to return to userspace after signal handling.

In Checkpoint Restore in Userspace (CRIU) project we place vDSO VMA
on restore back to the place where it was on the dump.

Make vDSO code track the VMA address by supplying .mremap() fops
the same way it's done for x86 and arm by:
commit b059a453b1cf ("x86/vdso: Add mremap hook to vm_special_mapping")
commit 739586951b8a ("arm64/vdso: Support mremap() for vDSO").

Signed-off-by: Guoyun Sun <sunguoyun@loongson.cn>
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Allison Randal <allison@lohutok.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

diff --git a/arch/mips/vdso/genvdso.c b/arch/mips/vdso/genvdso.c
index b66b6b1c4aeb9298d8ee4d30b7db9433f7df5f29..be57b832bbe0aec6e8a4717fcfb4910dc1a9d84e 100644 (file)
--- a/arch/mips/vdso/genvdso.c
+++ b/arch/mips/vdso/genvdso.c
@@ -251,6 +251,18 @@ int main(int argc, char **argv)
        fprintf(out_file, "#include <linux/linkage.h>\n");
        fprintf(out_file, "#include <linux/mm.h>\n");
        fprintf(out_file, "#include <asm/vdso.h>\n");
+       fprintf(out_file, "static int vdso_mremap(\n");
+       fprintf(out_file, "     const struct vm_special_mapping *sm,\n");
+       fprintf(out_file, "     struct vm_area_struct *new_vma)\n");
+       fprintf(out_file, "{\n");
+       fprintf(out_file, "     unsigned long new_size =\n");
+       fprintf(out_file, "     new_vma->vm_end - new_vma->vm_start;\n");
+       fprintf(out_file, "     if (vdso_image.size != new_size)\n");
+       fprintf(out_file, "             return -EINVAL;\n");
+       fprintf(out_file, "     current->mm->context.vdso =\n");
+       fprintf(out_file, "     (void __user *)(new_vma->vm_start);\n");
+       fprintf(out_file, "     return 0;\n");
+       fprintf(out_file, "}\n");
 
        /* Write out the stripped VDSO data. */
        fprintf(out_file,
@@ -275,6 +287,7 @@ int main(int argc, char **argv)
        fprintf(out_file, "\t.mapping = {\n");
        fprintf(out_file, "\t\t.name = \"[vdso]\",\n");
        fprintf(out_file, "\t\t.pages = vdso_pages,\n");
+       fprintf(out_file, "\t\t.mremap = vdso_mremap,\n");
        fprintf(out_file, "\t},\n");
 
        /* Calculate and write symbol offsets to <output file> */